Explain why the ball is moving faster just before it hits the ground than it was when it left the bat, but the mechanical energy of the ball-Earth system is constant
Answers
Answer:
its because pf gravity the more gravity is shown on the ball the faster it hits the grounnd.
Related Questions
The moon is held in its orbit around Earth by gravity. The moon also feels a gravitational pull from the sun. Which of the following is true? a The force of the moon acting on the sun is equal to the force of the sun acting on the moon. b The force of the sun acting on the moon is greater than the force of the moon acting on the sun. c The force of the sun acting on the moon is less than the force of the moon acting on the sun. d The force of the is moon acting on the sun is greater than the force of the sun acting on the moon.
Answers
Answer:
Explanation:
The moon is held in its orbit around Earth by gravity. The moon also feels a gravitational pull from the sun. Which of the following is true?
According to Newton's third law, the interaction forces are the same.
(a) The force of the moon acting on the sun is equal to the force of the sun acting on the moon.
7. A scientist studying a squid observes that the squid at rest
draws in 0.60 kg of water and then ejects that mass
of water back out in 0.15 seconds at a velocity of 15.0 m/s.
What is the average force on the squid during the
propulsion?
Answers
The average force on the squid during the ejection of 0.60 kg of water at a velocity of 15.0 m/s in 0.15 seconds is 60 N.
We can calculate the average force with the average acceleration as follows:
\( F = m\overline{a} \) (1)
Where:
m: is the mass of water = 0.60 kg\(\overline{a} \): is the average accelerationThe average acceleration is given by the change of velocity in an interval of time
\( \overline{a} = \frac{v_{f} - v_{i}}{t_{f} - t_{i}} \) (2)
Where:
\(v_{i}\): is the initial velocity = 0 (the squid is at rest)\(v_{f}\): is the final velocity = 15.0 m/s\(t_{i}\): is the initial time = 0 \(t_{f}\): is the final time = 0.15 sNow we can find the average force after entering equation (2) into (1)
\( F = m(\frac{v_{f} - v_{i}}{t_{f} - t_{i}}) = 0.60 kg(\frac{15.0 m/s - 0}{0.15 s}) = 60 N \)
Therefore, the average force on the squid during the propulsion is 60 N.
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The drop time can be calculated as follows: where y is the vertical height of the table and g is the
acceleration due to gravity. How did the calculated drop time compare to the average of your measured drop
times? Find the percent error using the following equation:
What factors might cause the differences?
Answers
Answer:
Tt can be calculated by copy
A hot air balloon is moving vertically upwards with a constant speed of 3.00 m/s. A sandbag is dropped from the balloon. It takes 5.00 seconds for the sandbag to fall to the ground. What was the height of the balloon when the sandbag was released?
Answers
The height of the balloon when the sandbag was released is 108m which is moving vertically upwards with a constant speed of 3.00 m/s.
Given the constant speed of hot air balloon (v) = 3m/s
Time taken by the sandbag to fall to the ground (t) = 5s
As the balloon is moving upwards and sandbag is falling downwards they both are in motion opposite to each other.
Let the initial speed of sandbag (u) = 3m/s
Acceleration due to gravity (a) = -9.8m/s^2
From equation of motion we have: s = ut + 1/2at^2
s = 3 x 5 + 1/2(-9.8)(5)^2
s = -108m
Hence the height of the balloon when the sandbag was released is 108m.
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when organism dies , the nutrients in its body ?
Answers
Answer: are released by the action of decomposers
Explanation:
Why do we close our eyes when we sleep
Answers
Answer:
because our some of the energy goes from our eyes
explanation;
There are several reasons why it's important to close our eyes while we sleep. Closed eyelids block light, which stimulates the brain to wakefulness. Closing our eyes also protects and lubricates the eyes while we sleep
if a sound increases 5db the sound becomes how many times louder
Answers
When a sound increases by 5 dB, it becomes roughly half as loud as a sound that increases by 10 dB due to the logarithmic nature of the decibel scale.
The decibel (dB) scale is a logarithmic scale used to measure the intensity or loudness of sound. It is important to note that the dB scale is not linear, meaning that a 5 dB increase does not correspond to a linear increase in perceived loudness.
The loudness of a sound is measured in decibels (dB). The question asks how many times louder a sound becomes when it increases by 5 dB.
To understand this, we need to know that the decibel scale is logarithmic, which means that each 10 dB increase represents a sound that is 10 times louder.
So, if a sound increases by 5 dB, we can calculate the increase in loudness as follows:
1. Determine how many 10 dB increments are in the increase: 5 dB / 10 dB = 0.5 increments.
2. Since we have 0.5 of a 10 dB increment, we can think of it as half of the loudness of a 10 dB increase.
Therefore, when a sound increases by 5 dB, it becomes approximately half as loud as a sound that increases by 10 dB.
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The velocity – time graph of an object moving along a straight line is shown in
fig. Find (a) the distance covered and (b) the displacement of the object in time
interval between t = 0 s and t = 10 s
Answers
(a) The distance travelled by the object is 100 m.
(b) The displacement of the object in time interval between t = 0 s and t = 10 s is 60 m.
What is the distance covered by the object?(a) The distance travelled by the object is calculated from the total area of the curve.
total distance = area of triangle 1 + area of triangle 2 + area of rectangle.
total distance = (¹/₂ x base x height)₁ + (¹/₂ x base x height)₂ + length x width
total distance = (¹/₂ x 6 s x 20 m/s) + (¹/₂ (8 - 6) 20) + (10 - 0)(10 - 8)
total distance = 60 m + 20 m + 20 m
total distance = 100 m
(b) The displacement of the object in time interval between t = 0 s and t = 10 s is calculated as follows;
displacement = final position - initial position
displacement = (¹/₂ x base x height)₁ + (¹/₂ x base x height)₂ + length x width
displacement = (¹/₂ x 6 s x 20 m/s) + (¹/₂ (8 - 6) (-20)) + (10 - 0)(10 - 8)
displacement = 60 m - 20 m + 20 m = 60 m
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some time later, kid a was spinning with the same speed that kid c had originally. what would kid a's centripetal acceleration be if his distance from the center of the merry-go-round was r
Answers
Centripetal refers to “center-seeking” Quantifies the change in directionof the velocity The acceleration is directed toward the center of the circle of motion.
The magnitude of the centripetal acceleration is given by V^2/r, the direction is toward the center of the circle. The tangential component of the acceleration is due to changing speed. The centripetal component of the acceleration is due to changing direction.
When an object is rotating at a constant angular velocity, the whole object has a constant angular velocity. Therefore, every mint on the turntable has the same, constant angular velocity.
The acceleration which causes the tangential velocity to change direction is called Centripetal acceleration. Centripetal acceleration is always in toward the center of the circle.
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which best describes the primary difference between asteroids and comets?
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The basic difference between asteroids and comets is their composition, the material of which they are made up of. Asteroids are made up of hard rocky substances but comets on the other hand are made up of ice and smoky dust particles in our space.
Asteroids and comets are both celestial bodies and are continuously present in our solar system. Asteroids orbit the Sun continuously and are small bodies in our solar system. They are made up of metals and rocky substance and also consist of organic compounds and metals. Asteroids tend to have shorter and elliptical orbits. Astronomers have discovered millions of asteroids in number in which some of them are hundreds of kilometres across and some as small as dust particles. Comets also orbit the Sun and are relatively small bodies of the solar system. When comets come nearer to Sun, the sun, some part of their ice melts. When some parts of their ice melt, the other materials that are present in them vaporize due to the immense heat provided by the sun. This results in a glowing effect that is sailing through space. The ice and compounds like ammonia and methane develop a fuzzy cloud-like shell and sometimes it is like a cloud floating known as the coma. This is a notable difference between comets and asteroids but the basic difference between asteroids and comets is their composition, the material of which they are made up of.
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I need answer ASAP, Will mark brainliest
Q. A car travels along a circular racing track at a constant speed of 100km/hr. Does it have uniform motion?
Answers
Answer:
Yes. If a car travels in a circular path with constant speed, its motion is called uniform circular motion
Explanation:
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Answer:
:)
Explanation:
does sound travel faster in warm air or in cold air? in humid air or dry air?
Answers
In warm air, sound travels more quickly than in cold air. Since the speed of sound is directly inversely proportional to the square root of the air's absolute temperature, the speed of sound rises with temperature.
Additionally, dry air travels faster than humid air for sound. The speed of sound is slightly affected by humidity, with sound traveling slightly slower in more humid air. This is due to the fact that airborne water vapor has the ability to slow down sound waves by absorbing some of their energy.
What is moisture?The amount of water vapor in the air is measured by humidity. At a given temperature, it is typically expressed as a percentage of the maximum amount of water vapor that the air can hold.
It is said that the air has a humidity of 100 percent when it is saturated. Any additional water vapor will condense into liquid or solid form (such as dew, fog, clouds, or precipitation) because the air cannot hold any more water vapor at this point. The air can hold more water vapor and is less likely to reach 100% humidity as the temperature rises.
Specific humidity or mixing ratio, which is the ratio of the mass of water vapor in the air to the mass of the air as a whole, is another way to measure humidity.
The weather and climate can be significantly affected by humidity. High humidity can cause clouds to form and precipitation to fall. It can also make the air feel hotter. Low humidity can make the air feel cooler, make it dry, and make wildfires more likely. The human body is also affected by humidity; low humidity can dry out the skin and nasal passages, while high humidity can make it difficult to cool down and can exacerbate respiratory issues.
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Two small point charges are charged by transferring a number of electrons from Q to q. The charges on the two points are equal and opposite, and the point charges are separated by 12.7 mm in air. Calculate the charge on Q and q if there is an attractive force of 22.5 µN between them. Use k = 8.99 x 10⁹ Nm²c-².
Answers
Cause 8.99•10^9
¿Qué pasa en nuestro cerebro cuando tomamos decisiones? Ejemplo: Estoy tocando una plancha caliente, y saco la mano rápidamente, ¿que paso en mi cerebro?
Answers
Answer:
Debido a la información de las neuronas sensoriales al cerebro.
Explicación:
Cuando toco una plancha caliente, extiendo la mano rápidamente porque las neuronas sensoriales presentes en la piel de nuestro cuerpo envían señales al sistema nervioso central, es decir, al cerebro. El cerebro toma decisiones de acuerdo con los estímulos y envía instrucciones a través de las neuronas motoras a los músculos para retirar las manos del hierro caliente a fin de evitar efectos nocivos en la piel debido al calor. El lóbulo frontal es una parte del cerebro que controla la personalidad, la toma de decisiones y el razonamiento.
The earth is compressed to keep one third of radius .Calculate the acceleration of the new earth.(acceleration due to gravity of the earth before it is compressed is 9.8m/s^2.
Answers
Answer: read your text book
Explanation:
Two blocks of masses 2 kg and 3 kg approach each other on a horizontal plane at velocities of 4 and 1.5 m/s, respectively. if the blocks collide and remain together, calculate the joint velocity after collision.
Answers
The joint velocity of the blocks after the collision is 2.5 m/s.
What are the initial velocities of the two blocks before the collision?To solve this problem, we can use the principle of conservation of momentum. The initial momentum of the system is equal to the final momentum, assuming there are no external forces acting on the system.
The initial momentum of the system is given by the sum of the individual momenta of the blocks. Block 1 has a mass of 2 kg and velocity of 4 m/s, giving it a momentum of 8 kg m/s. Block 2 has a mass of 3 kg and velocity of 1.5 m/s, resulting in a momentum of 4.5 kg m/s.
Since the blocks collide and stick together, their combined mass is 2 kg + 3 kg = 5 kg. The final momentum of the system is given by the joint velocity of the blocks after the collision, multiplied by the total mass.
Let the joint velocity after collision be V. Therefore, the final momentum is 5 kg * V kg m/s.
Using the principle of conservation of momentum, we equate the initial and final momenta:
8 kg m/s + 4.5 kg m/s = 5 kg * V kg m/s
Simplifying the equation, we get:
12.5 kg m/s = 5 kg * V kg m/s
Dividing both sides of the equation by 5 kg, we find:
V = 12.5 kg m/s / 5 kg = 2.5 m/s
The joint velocity of the blocks after the collision is 2.5 m/s.
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An object is pulled to the left by a force of 50 N. The same amount of force pulls it to the right. The object will ____.
A. Accelerate to the right
B. Accelerate to the left
C. change its direction
D. stay at rest
Answers
The body will stay at rest (Option D). It is because a force of magnitude 50 N is pulled towards left and another force is pulling it towards right with same magnitude 50 N. So, the direction of force is opposite and magnitude is same i.e. 50 N. So, they will cancel each other and net force is 0. Hence, there would be no acceleration.
Option A - Showing acceleration Option B - Showing accelerationOption C - Change of direction due to Net forceHence, these options are incorrect because they are only possible when net external force is non-zero. Staying at rest i.e. Option D means there is no motion and hence no acceleration, this shows that net force is 0\(.\)
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A student walks to the right 25-m along the 800 hall in 15-s. They turn around and walk 15-m to the left in 8.0-s. Calculate the average speed and the average velocity
Answers
Answer:
Explanation:
Total distance covered = 25 + 15 = 40 m
Total time = 15 + 8 = 23 s
Average speed = total distance covered / total time
= 40 / 23
= 1.74 m / s
Total displacement = 25 - 15 = 10 m
Total time = 15 + 8 = 23 s
Average velocity = total displacement / total time
= 10 / 23
= .434 m / s to the right .
The average speed of the student is approximately 1.74 m/s, and the average velocity is approximately -1.74 m/s (to the left).
Given:
Distance to the right = 25 m
Time taken to the right = 15 s
Distance to the left = 15 m
Time is taken to the left = 8.0 s
To calculate the average speed and average velocity, we need to use the following formulas:
Average speed = Total distance traveled ÷ Total time taken
Average velocity = Displacement ÷ Total time taken
Calculate the total distance traveled:
Total distance = Distance to the right + Distance to the left
Total distance = 25 + 15 = 40 m
Calculate the total time taken:
Total time = Time taken to the right + Time taken to the left
Total time = 15 + 8.0 = 23 s
Calculate the average speed:
Average speed = Total distance ÷ Total time
Average speed = 40 ÷ 23 = 1.74 m/s
Calculate the displacement:
Displacement = Final position - Initial position
Displacement = (-15 ) - 25 = -40 m
Calculate the average velocity:
Average velocity = Displacement ÷ Total time
Average velocity = -40 ÷ 23 ≈ -1.74 m/s
So, the average speed of the student is approximately 1.74 m/s, and the average velocity is approximately -1.74 m/s (to the left). The negative sign in the average velocity indicates that the student's net direction is to the left.
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How do mountains affect the climate of a region?
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If the net force acting on a moving object is zero, the object will: *
slow down and, eventually, stop.
continue at the same speed but change direction.
O
continue in the same direction but change speed.
O
continue in the same direction with no change of speed.
Answers
Answer: D) continue in the same direction with no change of speed.
In other words, the velocity of the object won't change.
A net force of 0 means that all forces acting on the object are in balance. If the object is in motion, then it stays in motion. If the object is at rest, then it stays at rest. This is newton's first law of motion describing inertia.
which neurotransmitter was the first one discovered, and is primarily responsible for movement abilities, including breathing?
Answers
Acetylcholine (ACh) is a neurotransmitter that functions in the human brain and body. It is composed of acetic acid and choline.
Acetylcholine was the FIRST neurotransmitter to be discovered.Acetylcholine was identified by Henry Hallet Dale (1914).Acetylcholine controls muscular movements. This neurotransmitter (acetylcholine) is released by motor neurons at the neuromuscular junction in order to activate muscle cells.Nicotinic receptors that bind to acetylcholine are expressed in the brainstem and spinal cord in order to regulate respiration rhythm.Learn more in:
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________are muscles connected to the skeleton.
1.) Smooth muscles
2.) Skeletal muscles
3.) Strong muscles
4.) Cardiac muscles
Answers
Answer: Skeletal Muscles
Explanation:
Skeletal muscles are attached to the skeleton by tough connective tissues called tendons
You are traveling in a car that is moving at a velocity of 20 m/s. You have to slam on brakes to avoid a dog in the road. You slow to 5 m/s. If your acceleration is -3 m/s2, how long did it take you to slow to 5 m/s
Answers
The time it takes you to slow to 5 m/s will be 5 seconds. Newton's first equation of motion is employed in a given problem.
What is velocity?The change of displacement with respect to time is defined as the velocity. Velocity is a vector quantity. it is a time-based component.
Given information;
Final velocity,v= 5 m\sec
Initial velociyt,u=20 m/sec
Acceleration,a=- 3m/s²
Time period,t=-?
From Newton's first equation of motion as;
\(\rm v = u+at \\\\ t= \frac{v-u}{a} \\\\ t= \frac{5 \ m/sec -20 m/sec }{-3 \ m/sec^2} \\\\\ t= 5 \ sec\)
Hence, the time it takes you to slow to 5 m/s will be 5 seconds.
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Find the force required to do 25 joule work when the force causes a displacement of 0.5m
Answers
Answer: Force required to 25 joule work when the force causes a displacement of 0.5m is 50N
Explanation: To calculate the work done we use the formula
W=F.s (1)
W= work done
F= force applied s= displacement
Given, work done W= 25 joules= 25 J
displacement s= 0.5m
∴From equation (1) we get the force required when work is done and displacement is given, that is
F\(=\frac{W}{s}\) (2)
∴Force required \(F=\frac{W}{s}= \frac{25J}{0.5m}=50N\)
(1 J is the work done by a force of 1 N acting over a displacement of 1 m and so 1 J= 1 Nm⇒ 1 N = 1 J/m)
ANS: Force required to do 25 J work when a force causes displacement of 0.5m = 50 N
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What is the element, atomic number, mass number, and charge of the image?
Answers
Answer:
1. Beryllium
2. 4
3. 9
4. 0
Explanation:
• The element shown in the image is beryllium because the atom shown contains four protons and the only element with four protons is beryllium.
• The atom's atomic number is 4, because atomic number is the number of protons of an element, and the atom shown contains 4 protons.
• The mass number of the atom is 9. Mass number is the sum of the number of protons and neutrons in the nucleus of an atom, and the atom shown contains 4 protons and 5 neutrons; therefore its mass number is (4 + 5 =) 9.
• The charge of the atom is 0. This is because it has 4 protons which give it a +4 charge, but it also has 4 electrons which give it a -4 charge. Therefore its net charge is: 4 + (-4) = 0.
The wasted energy in processing food is “lost” to ____.
mechanical energy
light energy
chemical energy
heat energy
Answers
The wasted energy in processing food is "lost" to heat energy .
What is heat energy ?The form of energy which is transferred between objects having different temperature is called heat energy.
How heat energy is lost in food processing ?In food processing heat transfer is an essential part. Baking , boiling , grilling , freezing etc . all activities are done for food processing. In all these processes heat energy is lost.Thus, we can conclude that heat energy is wasted in the food processing .
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From which location could you observe all of the stars during the course of a year?
Answers
By observing from the equator, you can see all of the stars in the sky at different times of the year, as the earth's rotation and orbit allow you to see different parts of the sky throughout the year.
The equator is an imaginary line that circles the earth, dividing it into two hemispheres: the northern hemisphere and the southern hemisphere. It is the line of zero degrees latitude and is located approximately at 0.00°N latitude. It is about 40,075 kilometers long and is the only line of latitude that is equidistant from both the North Pole and the South Pole. The equator passes through 13 countries including Ecuador, Colombia, Brazil, Congo, and Kenya.
The equator has a unique climate, as it is located in the tropics and receives more direct sunlight than any other part of the earth. This results in a hot and humid climate, with temperatures averaging around 27°C. The equator also experiences frequent rain, with high rainfall levels, particularly in the Amazon Basin. The equator is home to a diverse range of plant and animal life, including tropical rainforests, which are some of the richest and most diverse ecosystems on the planet.
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An experiment is set up in a lab. Three different
materials - copper, iron, and glass are all placed
with one end of each rod in a pan of hot water.
Each rod has an equivalent amount of wax on the
opposite end. After a few minutes, each of the
wax beads have melted at different times.
What is the dependent variable in the
experiment?
A.time
B.rate of convection
C.rate of radiation
D.rate of conduction
Answers
Answer:
B.rate of convection
Explanation:
Which of the following best explains why Earth’s lithospheric plates are constantly in motion?
A.
Convection currents occur as hot magma in the inner core rises and cooler magma in the outer core sinks. Lithospheric plates on top of this magma move as the currents move.
B.
Heat flows through materials from warm objects to cooler objects. The hot magma underneath the lithospheric plates heats the plates forcing them to move.
C.
As heat energy from the magma is absorbed into the lithospheric plates, the plates expand and move outward.
D.
Underneath Earth’s lithosphere is the mantle. In Earth’s mantle, hot magma rises and cooler magma sinks. This creates convection currents of moving magma that move the lithospheric plates in the direction the convection currents are moving.
Answers
The heated magma flows in convection currents as a result of extremely high pressure and heat in the ground. Tectonic plates, which make up the crust of a planet, move as a result of these currents.
The correct answer is :A.
The lithospheric plates move continuously for what reason?The plates move in both directions occasionally—sometimes towards sometimes and away from one another—due to the heat produced by nuclear processes occurring inside the planet. Plate motion or tectonic shift is the term for this movement.
The Earth's lithosphere moves around on a continuous basis.Huge, continually moving plates compensate the lithosphere and thus are organized into many segments. Tectonic plate collisions, which take place over millions of years, are often to blame for the elevation of land into mountains. Volcanism is occasionally linked to the formation of mountains.
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newton is said to have been inspired by what to describe the theory of gravity?
Answers
Answer:
an apple that fell down from a tree
Explanation:
he wondered what force was acting as the apple fell , he later termed it as a downward force acting on the earth called gravity.