Sounds are reflected best when bounced off [answer] hard surfaces.
Answers
Sounds are reflected best when bounced off the flat surfaces.
What is a sound wave?A sound wave is produced when a medium begins to vibrate. When an entity vibrates, a pressure wave is formed, which causes sound.
Since sound waves cannot easily pass through hard surfaces, they bounce off them instead, reflecting back to the source which they first came from.
When sound is reflected off of flat surfaces, it does so most effectively.
Hence the flat surface is the correct answer.
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Related Questions
I think this is physics but I just need someone to help me match the vocab plz
Answers
Answer:
1 - b
2 - e
3 - d
4 - a
5 - c
When describing motion, what is a frame of reference? (1 point)
O Any numerical measurement of the motion.
O The point of origin of the motion
OA system of reference points used to determine position and velocities of objects.
O An x-y grid with yourself at the origin.
Answers
C. When describing motion, a frame of reference is a system of reference points used to determine position and velocities of objects.
What is frame of reference?A frame of reference is an arbitrary set of axes with reference to which the position or motion of something is described or physical laws are formulated.
What is the importance of frame of reference?Frame of reference serves a valuable purpose, because it enables us to make more accurate measurement of our position, displacement, velocity and the total distance traveled.
Also, a frame of reference consists of an abstract coordinate system and the set of physical reference points that uniquely fix the coordinate system and take measurements within that frame.
In other words, it is a system or base, on which motion of an object is determined.
Thus, when describing motion, a frame of reference is a system of reference points used to determine position and velocities of objects.
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one of the objectives of the motion study conducted by frank and lillian gilbreth was to:
Answers
Motion study objective was to improve the efficiency and productivity of work processes by developing standardized work processes.
Frank and Lillian Gilbreth were pioneers in the field of motion study and were among the first to apply scientific principles to the study of work processes. One of the objectives of the motion study conducted by Frank and Lillian Gilbreth was to improve the efficiency and productivity of work processes.
The Gilbreths believed that by carefully analyzing work processes and identifying unnecessary motions, they could find ways to eliminate waste, reduce fatigue, and increase productivity. To achieve this objective, they used a combination of observation, time-lapse photography, and statistical analysis to identify and eliminate inefficient motions in work processes.
By breaking down work processes into their component motions and analyzing each motion, the Gilbreths were able to identify ways to reduce the time and effort required to complete a task. They also developed a system of standardized work processes that could be used to train workers and improve the consistency of work output.
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Two parallel plates have an area of
0.00100 m^2. How much charge
must you place on them to create a
1000 N/C field between the plates?
(The answer is *10^-12 C. Just fill
in the number, not the power.)
Answers
Answer:
8.85
Explanation:
The computation of the charge that must place on them in order to create 1000 N/C field between the plates is shown below:
We know that
E = (Q/A) ÷ E_o
1000 = Q ÷ 0.01×8.85× 10^-12
Q = 8.85 × 10^-12
So,
The answer is 8.85
The above formula should be applied so that the correct value could come
And, the same would be relevant
Answer:
8.85
Explanation:
acellus
Can someone help me please
Answers
Answer: The distance traveled by the car once around the racetrack = 100 meters.
Explanation:
Given: The length of the track = 100 meters
The distance is defined as the actual measurement of the path traveled by a body or an object.Then, the distance traveled by the car around the racetrack = Length of the track = 100 meters.
Hence, the distance traveled by the car once around the racetrack = 100 meters
rotational kinematics with constant angular acceleration: a 1.15-kg grinding wheel 22.0 cm in diameter is spinning counterclockwise at a rate of 20.0 revolutions per second. when the power to the grinder is turned off, the grinding wheel slows with constant angular acceleration and takes 50.0 s to come to a rest. (a) what was the angular acceleration (in rad/s2) of the grinding wheel as it came to rest if we take a counterclockwise rotation as positive? (b) how many revolutions did the wheel make during the time it was coming to rest?
Answers
(a) The angular acceleration of the grinding wheel as it came to rest is approximately -0.008 rad/s² (clockwise).
(b) The wheel made approximately 1000 revolutions during the time it was coming to rest.
(a) We can use the formula of rotational kinematics:
ω = ω₀ + αt
where ω is the final angular velocity, ω₀ is the initial angular velocity, α is the angular acceleration, and t is the time.
Given:
ω = 0 rad/s (final angular velocity)
ω₀ = 20.0 revolutions per second = 20.0 * 2π rad/s (initial angular velocity)
t = 50.0 s
Substituting the values into the formula, we have:
0 = 20.0 * 2π + α * 50.0
Solving for α, we get:
α ≈ -0.008 rad/s² (clockwise)
(b) To find the number of revolutions the wheel made during the time it was coming to rest, we can use the formula:
θ = ω₀t + 0.5αt²
where θ is the angular displacement.
Given:
ω₀ = 20.0 revolutions per second = 20.0 * 2π rad/s (initial angular velocity)
t = 50.0 s
α ≈ -0.008 rad/s² (clockwise)
Substituting the values into the formula, we have:
θ = (20.0 * 2π) * 50.0 + 0.5 * (-0.008) * (50.0)²
Simplifying the equation, we find:
θ ≈ 1000 revolutions
Therefore, the wheel made approximately 1000 revolutions during the time it was coming to rest.
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A circuit with a 25 V battery a 7 Ω resistor and 5 Ω resistor in series. What is the current throughout the circuit?
Answers
First, let's calculate the total resistance in the circuit.
Since the two resistors are in series, the total resistance is the sum of each resistance:
\(R=7+5=12\)Now, to calculate the current, we can divide the voltage by the total resistance:
\(\begin{gathered} I=\frac{V}{R} \\ I=\frac{25}{12} \\ I=2.083\text{ A} \end{gathered}\)Therefore the current is 2.083 A.
The Current throughout the circuit is 2.083 A.
To calculate the current, we will use the formula:
I = V / R
Where,
I = current,
V = Voltage of Battery.
R = Total Resistance.
Now, we will use the given values in the question,
V = 25 V
R = 7Ω + 5Ω
Now, we have to find total Resistance,
Total Resistance = 7Ω + 5Ω
= 12Ω.
Now, we will calculate the current using the above formula,
Putting all the values,
I = 25 / 12
I = 2.083 A.
Therefore, the Current running throughout the circuit is 2.083 A.
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Sushant went on an educational trip to a village. There he found a potter making pots. He found that the soil used for making pots was different from normal soil. Name the soil and also tell its characteristics.
Answers
The soil used for making pots by potters is commonly known as "Potter's Clay" or "Potter's Soil."
Characteristics of Potter's Clay:
1. Plasticity: Potter's clay has high plasticity, which means it can be easily molded and shaped into different forms without cracking or breaking.
2. Cohesiveness: It exhibits good cohesion, allowing the clay particles to stick together when moistened, forming a workable material.
3. Fine Particle Size: Potter's clay consists of fine particles that contribute to its plasticity and workability.
4. High Water Retention: It has the ability to retain water, which helps maintain the moisture content necessary for the clay to be shaped and formed.
5. Low Shrinkage: Potter's clay exhibits low shrinkage when it dries or undergoes firing, ensuring minimal distortion or cracking during the drying and firing processes.
6. Good Bonding Properties: The clay particles have the ability to bond together, creating a strong and durable structure once fired.
7. Good Porosity: After firing, the clay retains some porosity, allowing the pot to breathe and allowing for the exchange of air and moisture.
The neighborhood joker comes up to you and is really on a roll this morning. After several “good ones” they then say “OK so you’re taking physics, right? Here’s one – if the acceleration of gravity is 9.8 m/s2 then why isn’t everything accelerating? HAHAHA”. Being a dedicated student you give this question some real thought and come up with a reasonable response. You might say:
Answers
What are the three rules for the law of conservation of momentum?
Answers
find the body's acceleration each time the velocity is zero
Answers
The body's acceleration when the velocity is zero can be found by evaluating the derivative of the velocity-time graph at those points. The acceleration at each instance when the velocity is zero will give the body's instantaneous acceleration at that particular moment.
When the velocity of a body is zero, it means that the body is momentarily at rest. In such cases, we can analyze the body's motion by examining its velocity-time graph.
The points on the graph where the velocity is zero correspond to the instances when the body changes its direction of motion or comes to a temporary halt.
To find the body's acceleration at those instances, we need to calculate the derivative of the velocity-time function. The derivative gives us the rate of change of velocity with respect to time, which represents acceleration.
By evaluating the derivative at the points where the velocity is zero, we can determine the body's acceleration at those specific moments.
It's important to note that the body's acceleration when the velocity is zero can vary depending on the shape of the velocity-time graph and the specific behavior of the body's motion.
The acceleration may be positive if the body is decelerating, negative if it's accelerating in the opposite direction, or zero if the body maintains a constant velocity.
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A barber wants to set up a salon in a room measuring length 3m by 3m he has a simple wooden chair,three large mirrors & a bulb. Using the knowledge of shadows & reflection advise the barber on how to arrenge a good saloon using the only items he has
Answers
Here are some ideas for setting up the barber's salon based on the size of the space and the products available: The wooden chair should be positioned in the middle of the space, facing a wall.
The barber's workspace will be this. The room's other three walls should be covered with the three enormous mirrors. This will give the impression that there is more space present and enlarge the room. The mirrors should be angled to reflect both the client in the chair and the barber's work area. Over the chair, suspend the lightbulb from the ceiling. The barber salon will be able to operate in enough lighting thanks to this.The wooden chair should be positioned in the middle of the space, The barber can set up a white sheet or a reflecting surface to improve illumination even further.
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A man has a mass of 66 kg on Earth. What is his weight in Newtons?
Answers
Answer:
answer is 66 kilograms-force = 647.2389 newtons
Explanation:
Answer:
\(\boxed {\boxed {\sf 646.8 \ Newtons }}\)
Explanation:
Weight in Newtons can be found by multiplying the mass times the acceleration of gravity.
\(W=m*g\)
The mass of the man is 66 kilograms on Earth.
Earth has an acceleration of gravity that is 9.8 meters per square second.
\(m= 66 \ kg \\g=9.8 \ m/s^2\)
Substitute the values into the formula.
\(W=66 \ kg *9.8 \ m/s^2\)
Multiply.
\(W=646.8 \ kg*m/s^2\)
1 kg * m/s² is equal to 1 Newton, therefore our answer of 646.8 kg *m/s² is also equal to 646.8 Newtons, or N.
\(W=646.8 \ N\)
The man's weight in Newtons in 646.8 Newtons.
what is the climate tipping point 450 ppm apes
Answers
The climate tipping point at 450 ppm (parts per million) refers to a threshold concentration of carbon dioxide (CO2) in the atmosphere, beyond which there is a higher risk of triggering irreversible and catastrophic changes in the Earth's climate system. The 450 ppm target has been widely discussed as a goal for limiting global warming to 2 degrees Celsius above pre-industrial levels.
The climate tipping point refers to a threshold in the Earth's climate system. Beyond this, there is a higher risk of triggering irreversible and potentially catastrophic changes. The tipping point can occur when positive feedback mechanisms, such as melting ice caps, increasing forest fires, and accelerating global warming.
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A ball with a negative initial velocity slows down as it rolls down on a straight path is the ball’s acceleration positive or negative?
Answers
Answer:
positive acceleration.
Explanation:
As its slowing down gradually, its positive acceleration. When the ball slows down, its acceleration vector is in the opposite direction of its motion. Therefore positive acceleration.
Which statement describes the wave interactions in sound navigation and ranging (SONAR)? Sound is transmitted through the water and diffracted by hard surfaces.
Answers
In Sound Navigation and Ranging (SONAR), the sound wave is transmitted through water and it will reflect by hard surfaces. Option B) is correct.
SONAR is used to create nautical charts, find underwater navigation hazards, search for and map things on the seafloor such as shipwrecks and map the seafloor itself, waves are transmitted into the waver and reflected by hard surfaces.
The transmission and receiving of sound waves are involved in active sonar. For example, when a submarine is used to map the topography of the ocean floor.
It emits sound pulses known as pings towards the bottom of the ocean in its area.
Thus, 'Sound is transmitted through water and reflected by hard surfaces is the correct option'.
The question is incomplete. The options are missing in the question. They are A) Sound is transmitted through the water and diffracted by hard surfaces. B) Sound is transmitted through the water and reflected by hard surfaces. C) Sound is diffracted through the water and transmitted by hard surfaces. D) Sound is diffracted through the water and reflected by hard surfaces.
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help pls pls pls pls
Answers
an object is moving at a constant speed of 5mph and the net force = 0 N. which statement is true
Answers
Answer:5mph
Explanation:
Think about the physical activities that you have done as a part of this course. Describe a time during one activity in which a competitor displayed good sportsmanship toward you.
Answers
The activity in which a competitor displayed good sportsmanship towards me was during a football match.
What is Sportsmanship?This is an ethics or attitudes that show respect for the rules of a game and for the other players.
Sportsmanship was shown when i lost the deciding penalty and was consoled by the opponent.
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formula for load distance
Answers
A force of 6.0 Newton’s is applied to a block at rest on a horizontal frictionless surface over a 7.0 meter span. How much energy is gained by the block.
Answers
Answer:
42J
Explanation:
Given parameters:
Force applied = 6N
Distance moved = 7m
Unknown:
Amount of energy gained by the block = ?
Solution:
The amount of energy gained by the block is the same as the work done on the block.
The work done is the force applied to move the block through a distance;
Energy gained = force x distance = 6 x 7 = 42J
What term is used to describe the amount of energy it takes for 1 gram of a substance to be raised one degree in temperature?
A.
Specific energy
B.
Specific mass
C.
Specific gravity
D.
Specific heat
Answers
Answer:
The answer is specific heat.
Explanation:
The amount of energy for 1 gram of a substance to be raised one degree is called specific heat because it involves energy and temperature going up.
Heat is a form of energy, so it is the most appropriate name.
I hope this helps! :)
The amount of heat required to increase the temperature of 1 gram of a substance by 1 degree Celsius (°C) is known as specific heat. Since water has a higher specific heat than other substances, it requires more energy to raise its temperature. Thus, option D is correct.
What are the characteristics of Specific heat?One gram of a substance's temperature can be raised by one degree Celsius by applying a certain amount of heat, or specific heat.
Calories or joules per gram per Celsius degree are typically used as the units of specific heat. One calorie (or 4.186 joules) per gram per degree Celsius, for instance, is the specific heat of water.
Specific heat is the quantity of energy required to raise a substance's temperature by one degree in order to raise a gram of it.
Therefore, Specific heat term is used to describe the amount of energy it takes for 1 gram of a substance to be raised one degree in temperature.
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. a horizontal force of 200 n is applied to a 55 kg cart across a 10-m level surface. if the cart accelerates at 2.0 m/s2 , then what is the work done by the force of friction as it acts to impede the motion of the cart?
Answers
The first step to solving this problem is to calculate the net force acting on the cart. To do this, we need to use Newton's second law, which states that the net force is equal to the mass of the object multiplied by its acceleration. So, in this case, the net force on the cart is:
Net force = (55 kg)(2.0 m/s^2) = 110 N
Next, we need to determine the force of friction acting on the cart. We know that it is acting in the opposite direction to the applied force, so it is equal in magnitude to the net force but in the opposite direction. Therefore, the force of friction is:
Force of friction = -110 N
Finally, we can use the formula for work, which is:
Work = force x distance x cos(theta)
where theta is the angle between the force and the direction of motion. In this case, the force of friction is acting opposite to the direction of motion, so theta is 180 degrees and cos(theta) is -1.
The distance traveled by the cart is 10 m, so we can plug in the values and get:
Work = (-110 N)(10 m)(-1) = 1100 J
Therefore, the work done by the force of friction as it acts to impede the motion of the cart is 1100 J.
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A small stationary satellite deep in space exploded into two pieces one piece has a mass of 500kg the other 1500kg. The 1500kg piece moved away with a velocity of 20ms^1 A)What was the velocity of the 500kg part after explosion B)How much energy was generated in the explosion? State any assumptions you make.
Answers
The mass of the first part of the satellite is,
\(m_1=500\text{ kg}\)The mass of the second part is,
\(m_2=1500\text{ kg}\)The speed of the second part is,
\(v_2=20\text{ m/s}\)let the speed of the first part be v1.
\\
__Part (A)__
applying linear momentum conservation principle we get,
\(\begin{gathered} (m_1+m_2)\times0=m_1v_1+m_2v_2 \\ v_2=-\frac{m_1v_1}{m_2} \end{gathered}\)Substituting the values we get,
\(\begin{gathered} v_2=\frac{1500\times20}{500} \\ =60\text{ m/s} \end{gathered}\)Hence the velocity of the first part after the explosion is 60 m/s.
\\
__Part (B)__
the energy generated after the explosion is the kinetic energy of the masses.
we consider no mass is lost here, only the kinetic energy of the parts are the total energy after an explosion.
The kinetic energy after the explosion is,
\(\begin{gathered} K=\frac{1}{2}\mleft\lbrace^{}_{}m_1(v_1)^2+m_2(v_2)^2\mright\rbrace_{}_{} \\ =\frac{1}{2}\mleft\lbrace500\times60^2+1500\times20^2\mright\rbrace \\ =1.2\times10^6\text{J} \end{gathered}\)Joanne walks 0.4 km south to Macy’s then she gets hungry and walks 0.5 km north to the food court she then remember she needs a new outfit and walk 0.7 km to forever 21 she walks for a total of 1.75 hours . find her speed and velocity
Answers
Answer: 0.914 km/hour or 914 meters/hour
Explanation:
To calculate Joanne's speed, we need to divide the distance she traveled by the time it took her to travel that distance. In this case, she walked a total distance of 0.4 km south + 0.5 km north + 0.7 km = 1.6 km. To find her speed, we divide the distance traveled by the time it took:
Speed = 1.6 km / 1.75 hours
= 0.914 km/hour or 914 meters/hour
Velocity, on the other hand, is a vector quantity that describes an object's speed and direction. In this case, Joanne walked 0.4 km south and then 0.5 km north and then 0.7km to forever 21 so her direction is not constant. Therefore, her velocity would be zero, because her displacement is zero.
Which term describes a wave that is made up of electric and magnetic fields?
A) Electromagnetic wave
B) Wave made of particles
C) Electronic wave
D) Magnetic wave
Answers
Answer:
A) Electomagnetic wave
Explanation:
Mangrove forests play an important role in _______.
a.
fisheries
b.
coastal protection
c.
wildlife habitat
d.
all of the above
Please select the best answer from the choices provided
A
B
C
D
Answers
At high tide fish will feed among the mangrove roots - rich fishing ground
The trees trap sediment and soil in the river that would flow out to sea which also helps stop erosion
Wildlife utilise almost every part of the tree, with insects and birds, monkeys and lizards in the branches, shrimps and fish in the roots, and snails and clams in the soil
You have 16 kg of a radioactive sample with a certain half-life of 15 years. How much is left after 60 years?A. 8 kgB. 4 kgC. 2kgD. 1kgE. nothing
Answers
Given 16 kg of a radioactive sample with a certain half-life of 15 years:
To determine how much of the 16 kg radioactive sample is left after 60 years with a half-life of 15 years, we will use the following steps:
1. Calculate the number of half-lives that have passed: 60 years / 15 years per half-life = 4 half-lives
2. Calculate the remaining sample amount using the formula: remaining amount = initial amount * (1/2)^number of half-lives
3. Apply the formula: remaining amount = 16 kg * (1/2)^4 = 16 kg * 1/16 = 1 kg
After 60 years, 1 kg of the radioactive sample is left. The correct answer is D. 1kg.
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one cylinder of an automotive four-stroke cycle engine completes a cycle every ________.
Answers
One cylinder of an automotive four-stroke cycle engine completes a cycle every four strokes.An automotive four-stroke cycle engine completes a cycle every four strokes, with the intake stroke drawing in fuel-air mixture, the compression stroke compressing the mixture, the power stroke igniting the compressed mixture, and the exhaust stroke expelling burnt gases. Each stroke takes two full rotations of the crankshaft.
One cylinder of an automotive four-stroke cycle engine completes a cycle every two crankshaft revolutions.
1. Intake stroke: The piston moves downward, drawing in a fuel-air mixture as the intake valve opens.
2. Compression stroke: The piston moves upward, compressing the fuel-air mixture with both valves closed.
3. Power stroke: The spark plug ignites the compressed mixture, causing it to expand and push the piston downward. This generates power.
4. Exhaust stroke: The piston moves upward again, expelling the burnt gases through the open exhaust valve.
These four strokes make up one cycle, which requires two full rotations of the crankshaft.
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which of the following explains why a positive acceleration does not always indicate an increase in the magnitude of velocity? gravity is usually negative. acceleration of a body can reflect a change in the velocity direction. acceleration is calculated from instantaneous velocity, and that value is typically positive. horizontal velocity is independent of gravity. positive acceleration always does indicate an increase in the magnitude of velocity.
Answers
The following explains why a positive acceleration does not always indicate an increase in the magnitude of velocity: acceleration of a body can reflect a change in the velocity direction.
What is acceleration?Acceleration is the rate at which an object's velocity changes. Velocity, in turn, is the rate at which an object's position changes. Acceleration is expressed in terms of meters per second squared (m/s²).
It's important to note that a positive acceleration doesn't always imply that an object's velocity is increasing. If an object's velocity is decreasing but its acceleration is still positive, the velocity's magnitude will decrease at a slower rate.
What is the relationship between acceleration and velocity?When an object's velocity changes, it is said to accelerate. Acceleration is described by a direction and a magnitude. In other words, acceleration is the rate at which an object's velocity changes. It's also possible for acceleration to be negative. Negative acceleration occurs when an object's velocity decreases over time.
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