A decibel measures the _____________ of sound.
A.pitch
B,frequency
C.loudness
D.amplitude
Answers
Related Questions
Two helium isotopes fuse to form beryllium, as shown below. The mass of beryllium is 2.73 x 107 kg less than the combined mass of the two helium atoms. How much energy was produced during this reaction? The speed of light is 3 x 108 m/s. Show your work. Use E = mc².
3/2He+ 4/2He → 7/4Be
Answers
A chemical element with the symbol Be and atomic number 4 is known as beryllium. Beryllium is a solid at room temperature and is categorized as an alkaline earth metal. The molar mass of beryllium (atomic number 4) is 9.012 g/mol. Accordingly, if all 6.22x1023 Beryllium atoms were put together in a mole, they would weigh 9.012g on a triple beam balance.
Explain about the mass of beryllium?
The atomic mass unit serves as the unit of measurement for mass (amu). A mass unit of an atom is 1.66 x 10-24 gram. The mass of one nucleon, which can be either a single proton or neutron, is roughly equal to one unified atomic mass unit, which is numerically equivalent to 1 g/mol.
In the aircraft industry in particular, beryllium is employed in gears and cogs. A silvery-white metal is beryllium. It has a low density and is relatively soft. Gyroscopes, springs, electrical contacts, spot-welding electrodes, and non-sparking tools all use beryllium in alloys with copper or nickel.
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how do we use sounds in ways other than just listening?
Answers
Answer:
talking and we can make our own sound
Explanation:
Sound could be an element for detecting people or entities, This is very useful for blind people. Sounds could also heal your chakra or make you feel like dancing.
Hope I helped. :)
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a) Is magnification a constant property of a lens? Ref. data tables 2 & 3 and the definiton of magnification to explain your answers..
b)What is the focal length of a convex lens that produces an image on a screen 40 cm away with an object placed 10 cm away from the lens? what is the magnification? is the image inverted or upright? show all calculations in your answers please.
Answers
a) Magnification is not a constant property of a lens. It is defined as the ratio of the size of the image formed by the lens to the size of the object. This ratio can change depending on the distance between the object and the lens, as well as the focal length of the lens.
Referring to data tables 2 & 3, we can see that as the object distance decreases or the image distance increases, the magnification also increases. Similarly, as the focal length of the lens increases, the magnification decreases.
b) The focal length of the convex lens is 6.67 cm, the magnification is 4, and the image is inverted.
Given: Object distance (u) = 10 cm, Image distance (v) = 40 cm
Using the lens formula, we can calculate the focal length (f) of the lens:
1/f = 1/u + 1/v
1/f = 1/10 + 1/40
1/f = 0.15
f = 6.67 cm
The magnification (M) can be calculated using the formula:
M = v/u
M = 40/10
M = 4
The image is inverted since the magnification is greater than 1.
Therefore, the focal length of the convex lens is 6.67 cm, the magnification is 4, and the image is inverted.
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A plane moves at a certain velocity then accelerates at the rate of 52 m/s2 for a distance of 2300 m to reach a velocity of 620 m/s. How fast was the plane going before it began to accelerate?
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The region of magnetic influence around either pole of a magnet is called the magnetic field. The magnetic field line points out from the south magnetic pole and in from the north magnetic pole. This statement is:
Answers
Answer:
This statement is not true
Explanation:
Because The normal magnetic field line points out from the north magnetic pole and in from the south magnetic pole.
Answer:
false
Explanation:
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A red block (mr=2kg) is released from rest and slides down a slope. At the bottom it collided with a blue block (mb=0. 5kg). They stick together after the collision.
a) what is the velocity of the blocks immediately after the collision?
b) the blocks then slide into a ruff area offering 4N of friction. How many seconds does it take for the blocks to come to a rest?
c) How far has it travelled in the first 3s of moving in the sand zone?
Answers
a) The velocity of the blocks immediately after the collision is 2 m/s. b) It takes 2.5 seconds for the blocks to come to a rest. c) In the first 3 seconds of moving in the sand zone, the blocks have traveled 6 meters.
a) To determine the velocity of the blocks immediately after the collision, we can use the principle of conservation of momentum. Before the collision, only the red block is in motion, so its initial momentum is zero. After the collision, the blocks stick together, so their combined mass is 2 kg + 0.5 kg = 2.5 kg. By conserving momentum, we can calculate the velocity: (2 kg)(0 m/s) + (0.5 kg)(v) = (2.5 kg)(v), where v is the velocity of the blocks after the collision. Solving this equation gives v = 2 m/s.
b) In the rough area with 4 N of friction, we can calculate the deceleration of the blocks using the formula F_friction = m(a), where F_friction is the frictional force, m is the total mass of the blocks (2.5 kg), and a is the deceleration. Rearranging the equation, we find a = F_friction / m = 4 N / 2.5 kg = 1.6 m/s². To determine the time it takes for the blocks to come to a rest, we can use the equation\(v = u + at\), where u is the initial velocity (2 m/s), v is the final velocity (0 m/s), a is the deceleration (-1.6 m/s²), and t is the time. Solving for t gives us t = (v - u) / a = (0 - 2) / (-1.6) = 2.5 seconds.
c) In the first 3 seconds of moving in the sand zone, we need to calculate the distance traveled. We can use the equation \(s = ut + (1/2)at^2\), where u is the initial velocity (2 m/s), a is the deceleration (-1.6 m/s^2), and t is the time (3 seconds). Plugging in the values, we get \(s = (2)(3) + (1/2)(-1.6)(3)^2\)= 6 meters. Therefore, the blocks have traveled approximately 6 meters in the first 3 seconds of moving in the sand zone.
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Adam observed properties of four different waves and recorded observations about the frequency and volume of each one in his chart. Which statement could Adam declare based on the data in the table
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HELP PLS ITS BEEN AN 3 HOURS
Answers
Answer:
0.433 s
Explanation:
Let's break the projectile motion into its horizontal and vertical components:
Horizontal component (x):
3.22 * cos(62.9)Vertical component (y):
3.22 * sin(62.9)We want to find the time required for the hurdler to travel a distance of 0.635 m. In order words, his displacement should be 0.635 m in the x-direction.
Since we don't have the final velocity, we can use this constant acceleration equation:
Δx = v₀t + 1/2at²We have three known variables and want to solve for t. Using this equation in the x-direction, we have:
Δx = 0.635 mv₀ = 3.22 * cos(62.9)a = 0 m/s² t = ?Substitute these values into the equation.
0.635 = [3.22 * cos(62.9)] t + 1/2(0) t²Simplify the equation.
0.635 = 3.22 * cos(62.9) tDivide both sides by the horizontal component of the initial velocity.
0.432899075 = tSince we start with 3 sig figs, we will round this value to 0.433. The time it takes to clear the hurdle is 0.433 seconds.
Consider mechanical energy to find the coefficient of friction between the sledge and the ground
Answers
Answer:
0.08
Explanation:
We can represent the situation with the following figure
Now, by the conservation of energy, we can write the following equation
\(\begin{gathered} K_i+U_i-Wnc=K_f \\ \frac{1}{2}mv_i^2+mgh-F_fd=\frac{1}{2}mv_f^2 \end{gathered}\)Where m is the mass, vi is the initial velocity, g is the gravity, h is the height, Ff is the force of friction, d is the distance traveled by the sledge, and vf is the final velocity.
Using the free body diagram, we get that the force of friction is equal to
\(\begin{gathered} F_n=mg\sin60 \\ \text{ Then} \\ F_f=\mu F_n \\ F_f=\mu mg\sin60 \end{gathered}\)Now, we can replace the expression for Ff in the equation above and solve for the coefficient of friction μ
\(\begin{gathered} \frac{1}{2}mv_i^2+mgh-(\mu mg\sin60)d=\frac{1}{2}mv_f^2 \\ \\ \frac{1}{2}v_i^2+gh-\mu gd\sin60=\frac{1}{2}v_f^2 \\ \\ \mu gd\sin60=\frac{1}{2}v_i^2+gh-\frac{1}{2}v_f^2 \\ \\ \mu=\frac{1}{gd\sin60}(\frac{1}{2}v_i^2+gh-\frac{1}{2}v_f^2) \\ \end{gathered}\)Replacing g = 9.8 m/s², d = 16 m, vi = 3 m/s, h = 8 m, and vf = 12 m/s, we get
\(\begin{gathered} \mu=\frac{1}{(9.8)(16)\sin60}(\frac{1}{2}(3)^2+(9.8)(8)-\frac{1}{2}(12)^2) \\ \\ \mu=0.08 \end{gathered}\)Therefore, the coefficient of friction is 0.08
A tennis ball "A" is released from rest down a 10.0 m long inclined ramp with a uniform acceleration of 5.0 m/s2 . Another tennis ball "B" is initially located at the same height as ball "A" right above the lower edge of the ramp. Ball "B" is thrown upward with some initial speed at the same instant as the release of ball "A". A) What was the initial velocity of ball "B" so that "A" and "B" reach the bottom of the ramp at the same time?
Answers
Answer:
4.8 m/s
Explanation:
For tennis ball "A", we are told that;
Initial velocity; u = 0 m/s
Distance; h = 10 m
Acceleration; a = 5 m/s²
Thus, using Newton's equation of motion, we can find time(t).
h = ut + ½at²
10 = 0 + ½(5)t²
10 = ½(5t²)
t² = 2 × 10/5
t² = 4
t = √4
t = 2 seconds
Now, this time would be the same for ball B since we are told that they reach the bottom at the same time.
Now, since ball B is thrown upwards, it means it is thrown against gravity. Thus;
h = -ut + ½gt²
10 = -2u + ½(9.8)(2²)
Where u is initial velocity of Ball B.
Thus;
10 = -2u + 19.6
2u = 19.6 - 10
2u = 9.6
u = 9.6/2
u = 4.8 m/s
In a 30cm by 25cm rectangle, a quadrant of a circle of radius 7cm has been cut away from each corner. What is the perimeter of the part left?
Answers
Answer: 98cm
Explanation:
Dimension of rectangle = 30cm by 25cm
Length(l) = 30cm
Width(w) = 25cm
Perimeter of a rectangle = 2(l + w)
Quadrant of circle cut away of each side of the rectangle :
Radius = 7 cm =
That is, the dimension of the triangle reduces by 2 * 7 = 14cm
New length = 30 - 14 = 16cm
New width = 25 - 14 = 11cm
The four corners =( 4 × 2πr ) / 4
2πr = 2 × 22/7 × 7 = 44cm
Perimeter = 2(16cm + 11cm)
= 2(27cm)
Perimeter = 54cm + 44 = 98cm
An important characteristic of urine is its specific gravity or density, which is the same as pure water (hyotonic).
a. true
b. false
Answers
An important characteristic of urine is its specific gravity or density, which is the same as pure water (hyotonic). b. false
DensityA substance's density (more specifically, volumetric mass density; commonly referred to as specific mass) is defined as its mass per unit volume. The Latin letter D can also be used to represent density, however the most common symbol is (the lower case Greek letter rho). Mass divided by volume is the mathematical definition of density:
ρ=m/V, where denotes density, m denotes mass, and V denotes volume. Density is sometimes loosely defined as weight per unit volume, although this definition is incorrect technically; the term "specific weight" is more appropriate. An example of this is in the US oil and gas business. Density and mass concentration have the same numerical value for a pure substance.
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no one can answer
why electrons are negetive?
Answers
Answer:
they're negative bc a proton is positive. a proton attracts an electron by the fact that opposite charges attract each other, while two electrons repel each other. Thus it shows that polarity of the charge on an electron and a proton is opposite.
Explanation:
NEED HELP ASAP, WILL GIVE BRAINLIEST
Which is an example of convection currents?
marshmallows toasting over a campfire
a pot being heated by an electric burner
feet getting hot when stepping across sand
a radiator emitting warm air and drawing in cool air
Answers
Answer:
D-A radiator emitting warm air and drawing in cool air
Explanation:
How does the speed of light that emerges from a pane of glass compare with the speed of light incident on the glass?.
Answers
The speed of light that emerges from a pane of glass compare with the speed of light incident on the glass because The emerging and incident speed of lights are the same.
What is Light ?Light is a phenomenon which is defined as the electromagnetic form of energy which gives us the sensation of vision.
What is Speed ?Speed is defined as the rate of change of distance travelled by a body per unit time.
What is the speed of light?The speed at which the light propagates through the medium is known as Speed of light. It is a fundamental constant of the nature. In all inertial frames of reference the speed of light in free space has the same value.
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Which of the following is NOT part of a circuit?
a. rim
b.conductor
c.power source
d.load
Answers
The following graphs display the exact function solution y = ex and the three numerical solutions Euler, Improved Euler (Heun) and Runge-Kutta at different intervals (iterations). Analyze each set of graphs (there are a total of four) noticing the Relative Deviation on the right. Write at least 3 - 5 sentence paragraph describing your observation.
Answers
The graphs display the function solution y = ex and three numerical solutions -Euler, Improved Euler, and Runge-Kutta- at different intervals. The Relative Deviation on the right measures the difference between the numerical solutions and the exact function solution.
The analysis of each set of graphs involves comparing the numerical solutions (Euler, Improved Euler, and Runge-Kutta) with the exact function solution y = ex. The Relative Deviation provides an indication of how closely the numerical solutions approximate the exact solution.
To analyze each set of graphs, follow these steps:
Examine the shape of the graphs: Compare the curves of the numerical solutions -Euler, Improved Euler, and Runge-Kutta-with the exact function solution. Look for similarities and differences in terms of how well they capture the shape and behavior of the function.Evaluate the Relative Deviation: Focus on the Relative Deviation values displayed on the right side of the graphs. The Relative Deviation measures the percentage difference between the numerical solutions and the exact function solution. Higher values indicate larger deviations and less accuracy in approximating the true solution.Compare the performance of the numerical methods: Assess the performance of each numerical method -Euler, Improved Euler, and Runge-Kutta-based on their respective graphs and Relative Deviation values. Look for trends and patterns in how the deviation changes with each iteration or interval.Determine the most accurate numerical method: Based on the analysis of the graphs and Relative Deviation values, identify the numerical method that provides the closest approximation to the exact function solution. A lower Relative Deviation indicates better accuracy and a closer match to the true solution.By examining the graphs and assessing the Relative Deviation, one can analyze the accuracy and performance of the numerical solutions -Euler, Improved Euler, and Runge-Kutta- in approximating the exact function solution y = ex at different intervals or iterations.
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a boy throws a ball straight up into the air. it reaches its highest point after 4 seconds.how fast was the ball going when it left the boy's hand
Answers
Answer:
Explanation:
The most important thing to remember about parabolic motion in physics is that when an object reaches its max height, the velocity right there at the highest point is 0. Use this one-dimensional motion equation to solve this problem:
v = v₀ + at and filling in:
0 = v₀ + (-9.8)(4.0) **I put in 4.0 for time so we have more than just 1 sig fig here**
0 = v₀ - 39 and
-v₀ = -39 so
v₀ = 39 m/s
Adam doesn't know whether he will be thanked or criticized if he helps cook dinner. He isuncertain aboutA. self-efficacy expectancies.B. competencies.C. encoding strategies.D. behavior-outcome expectancies.
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Adam's uncertainty about whether he will be thanked or criticized for helping cook dinner relates to his behavior-outcome expectancies.
Behavior-outcome expectancies refer to a person's beliefs about the outcomes or consequences that are likely to follow from their actions. In this scenario, Adam is uncertain about the potential outcomes of his behavior, specifically whether he will be thanked or criticized for helping cook dinner. In this case, Adam's uncertainty specifically revolves around his behavior-outcome expectancies (D). He is unsure about the potential responses he will receive for his action of helping cook dinner. This uncertainty may stem from factors such as past experiences, social norms, or the specific dynamics and expectations within his household. Adam's uncertainty highlights the importance of understanding and managing behavior-outcome expectancies in interpersonal interactions and decision-making processes.
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Matt has a solid cylinder and a hollow cylinder, and wants to spin each around the same axis of rotation. they have the same mass and radius. which object has more rotational inertia?
Answers
The hollow cylinder has more rotational inertia.
Any object with the ability to rotate possesses rotational inertia. It is a scalar value that indicates how challenging it is to alter an object's rotational velocity around a specific rotational axis. The role of mass in linear mechanics is analogous to that of rotational inertia in rotational mechanics.
According to the equation rotational inertia = mass x \(radius^{2}\), it is a scalar, not a vector, and it depends on the radius of rotation. The measure of an object's resistance to a change in rotation is called rotational inertia. In practically all physics issues where mass is involved in rotating motion, rotational inertia plays a significant role. It is used to calculate angular momentum and enables us to explain how rotational motion changes as the distribution of mass changes (by conservation of angular momentum).
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Answer:
The hollow cylinder has more rotational inertia.
Explanation:
On Khan it is correct.
n a recording of voltages due to brain activity (an eeg), a 10.0 v signal with a 0.500 hz frequency is applied to a capacitor, producing a current of 100 ma. resistance is negligible. what is the capacitance?
Answers
The capacitance of the capacitor used for recording of voltages due to brain activity in an EEG is 0.00318 Farads or 3.18 millifarads (mF).
The capacitance can be calculated using the formula I = C*dV/dt, where I is the current, C is the capacitance, and dV/dt is the rate of change of voltage over time. Rearranging the formula, we get C = I/(dV/dt).
In this case, the current is given as 100 mA and the frequency of the signal is 0.5 Hz. Since the voltage is given as 10 V, we can calculate the rate of change of voltage over time as 2*\(\pi\)*0.5*10 = 31.4 V/s.
Plugging in the values, we get:
C = 0.1 A / (31.4 V/s) = 0.00318 F.
Therefore, the capacitance is 0.00318 Farads or 3.18 millifarads (mF).
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Who do you think had the most influence on modern science: Descartes or Newton? And why? i'll give brainliest
Answers
Answer: Newton
Explanation:
Isaac Newton is viewed as one of history's most persuasive researchers. During his lifetime, Newton created the hypothesis of gravity, the laws of movement (which turned into the establishment of material science), another strategy for arithmetic known as analytics, and leap forwards in optics like the reflecting telescope.
HELLO QUESTION 9 PLEASE HELP
Answers
Answer:
Explanation:
it's B) or the question right above the one you've marked. The planets do form a plane almost exactly :0 but not a sphere.
How do electric motors work?
A. They convert kinetic energy into electrical energy
B. They convert electrical energy into kinetic energy
C. They convert chemical energy from gasoline into kinetic energy
D. They convert mechanical energy into potential energy
Answers
Answer:
Option C
Explanation:
The answer is option C or "they convert chemical energy from gasoline into kinetic energy." Electric motors usually require a power source for example a car, you put gasoline in that car which is converted into kinetic energy which allows the motor to operate and run, (enabling you to drive the car) the kinetic energy is then used into you run out of gasoline.
Hope this helps.
structure of conductor and insulator
Answers
Insulator: A material with a substantial gap between the valence and conduction bands. Because no electrons can travel up to the conduction band, the valence band is filled. As a result, the conduction band is completely vacant.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Conductor: The valence bands of a conductor are not complete, hence the conduction band is continuous with the valence band. Electrons in the valence band will migrate to the conduction band, leaving a positive charged vacancy known as a hole behind.
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Insulator Defintion:
Energy band Theory:
According to this theory the overlapping of valence band and conduction band tells us about the conductivity of a substance, in insulators the valence band and the conduction band both are separated to a large distance which will cannot be over lapped by applying small energy. If conduction band and valence band don't overlap there would be no exchange of electrons and in that case the material cannot conduct electricity or heat.
Presence of Free Electrons:
The conductivity of a element is wholly and solely dependent upon the presence of free electrons which which can move freely and conduct electricity . In insulators there are no free electrons and in that case it cannot conduct electricity.
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Conductor Definition:
A conductor is an object or kind of material in physics and electrical engineering that permits charge (electric current) to travel in one or more directions. Metal materials are common electrical conductors. The materials or substances that allow electricity to flow through them are referred to as conductors. Furthermore, conductors allow heat to pass through them. Metals, the human body, the Earth, and animals are all examples of conductors. The human body is an excellent conductor.
in three sentences, explain why I would die with a plastic bag over my head, including the vocabulary oxygen, carbon dioxide, and cellular respiration
Answers
Answer:
easy how you would die from a plastic bag being over your head is by sufacation the oxegen you breath with soon become carbon dioxide and kill you is it gets to your cellular reperation atory
Explanation:
What is magnetic force??
O A. A force between protons
O B. A force between two poles
O C. A force caused by air particles
O D. A force between objects with mass
Answers
Answer:
I believe it's B.
Explanation:
The force that a magnet exerts on certain materials, including other magnets, is called magnetic force. The force is exerted over a distance and includes forces of attraction and repulsion. North and south poles of two magnets attract each other, while two north poles or two south poles repel each other.
HELP ME PLEASE!!!
Explain impeachment in the process that Congress must follow during impeachment. Use details to support your answer.
Answers
Answer:
first a representative sponsor is a bill the bill is then assigned to a committee for study if released by the committee the bill is put on a calendar to be voted on debated or amended if the bill passes by simple
Explain how motion is relative
Answers
Answer:
it's always relative because it's measured or observed with respect to another thing
Explanation:
do you understand?
What is the source of Jupiter's nonthermal radio radiation?
a. the gravitational attraction of Jupiter's moons
b. the Great Red Spot
c. thermonuclear fusion in Jupiter's core
d. charged particles moving in a magnetic field
Answers
The source of Jupiter's nonthermal radio radiation is d) charged particles moving in magnetic field. Jupiter has strong magnetic field that traps particles from solar wind and the Jovian moons.
Theses particleare accelerated by the magnetic field and produce synchrotron radiation, which is a type of nonthermal radio radiation. The intensity of the radiation is strongest near Jupiter's magnetic poles, where the magnetic field is strongest. The Great Red Spot and thermonuclear fusion in Jupiter's core do not contribute to the nonthermal radio radiation. The study of Jupiter's nonthermal radio radiation helps scientists better understand the planet's magnetic field and the interactions between the planet and its surrounding environment.
The thermal and nonthermal radio leptons (electron and pair) produced by synchrotron, bremsstrahlung, and Compton processes, as well as bound-bound and bound-free transitions of high-Z elements, emit high-energy radiation from compact astrophysical objects. The Monte Carlo (MC) methodology is the most effective and precise way to predict the transport of high-energy radiation because Compton scattering is a major radiation process in this regime.
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