PHYSICS HIGH SCHOOL

A tennis ball is released from a height of 4.0 m above the floor. After its third bounce off the floor, it reaches a height of 183 cm. What percentage of its mechanical energy does it lose with each bounce?23%

27%

20%

15%

Answers

Answer 1

Answer:

Answer:

The percentage of its mechanical energy does the ball lose with each bounce is 23 %

Explanation:

Given data,

The tennis ball is released from the height, h = 4 m

After the third bounce it reaches height, h' = 183 cm

= 1.83 m

The total mechanical energy of the ball is equal to its maximum P.E

E = mgh

= 4 mg

At height h', the P.E becomes

E' = mgh'

= 1.83 mg

The percentage of change in energy the ball retains to its original energy,

$\Delta E\%=(1.83mg)/(4mg)*100\%$

ΔE % = 45 %

The ball retains only the 45% of its original energy after 3 bounces.

Therefore, the energy retains in each bounce is

∛ (0.45) = 0.77

The ball retains only the 77% of its original energy.

The energy lost to the floor is,

E = 100 - 77

= 23 %

Hence, the percentage of its mechanical energy does the ball lose with each bounce is 23 %

Answer 2

Answer:

Answer: 23

Explanation: gradpoint

Related Questions

What is the purpose of the CETI program?a. to listen for disturbances in the earth's crust b. to listen for unlawful broadcasts from rogue nations c. to listen for signals from outer space d. to listen for sounds emitted from the ocean
The field around a solenoid has a configuration similar to the field of a long, straight wire.TrueFalseI feel like this is false because I know it is similar to that of a bar magnet. Right?
Lime your sus you walked past the body but didn't report
How to find the period of a wave
What is the current when a 71-W lamp is connected to 120 V?

A force is applied to a block, causing it to accelerate along a horizontal, frictionless surface. The kinetic energy gained by the block is equal to which of the following

Answers

Answer:

The work done to the block

See

Workdone is Force×Displacement .

Also work done is total mechanical energy of body

As potential energy is 0

Mechanical energy=Kinetic energy

So option C is correct

A 139 kg physics professor has fallen into the Grand Canyon. Luckily, he managed to grab a branch and is now hanging 89 m below the rim. A student (majoring in linguistics and physics) decides to perform a rescue/experiment using a nearby horse. After lowering a rope to her fallen hero and attaching the other end to the horse, the student measures how long it takes for the horse to pull the fallen physicist to the rim of the Grand Canyon. The acceleration of gravity is 9.8 m/s 2 . If the horse’s output power is truly 1 horsepower (746 W), and no energy is lost to friction, how long should the process take? Answer in units of s.

Answers

In order to lift the fat (306 lb) physics professor 89 meters up to
the rim, he'll need more potential energy, equal to

(mass) x (gravity) x (height) = (139 x 9.8 x 89) = 121,236 joules .

If the faithful horse delivers 1 constant horsepower = 746 watts,
AND if the cute-as-a-button student has instantly figured out a
way to keep the rope sliding around the edge without any friction,
then the soonest Prof. Tubby can arrive at the rim is

(121,236 joules) / (746 joules/sec) = 162.5 seconds .

Nowhere in this tense drama has the student needed her linguistics
skill yet, but I'll bet it comes in handy as she attempts gamely to
comprehend all of the various pleadings, prayers, and expletives
uttered by her heavy hero from the time he falls over the rim until
he's again lifted to it.

3. During a race, a sprinter increases from 5.0 m/s to 7.5 m/s over a period of 1.25s. What is the sprinter’s average acceleration during this period?Also please try and explain
Please and Thank you

Answers

(7.5)-(5)
----------- = 2 m/s^2
(1.25-0)

Average acceleration is calculated using the equation V(f)-V(i) / t(f)-t(i). (Final velocity minus initial velocity divided by final time minus initial time)

What kind of scientist investigation involve making observations

Answers

Scientists need to make observations when measuring growth rates of different organisms, when observing mating rituals of animals, and when determining characteristics of new substances. These are but a few examples.

When you study animals.

Explain what happens when you vigorously rub your wool socks on a carpeted floor,touch a metal doorknob and get shocked

Answers

When you are rubbing the wool socks on the carpet, you are transferring electrons. When you touch the metal doorknobs, the electron levels are then going back to normal. The rush of electrons causes the shock.

Final answer:

When you rub your wool socks on a carpeted floor and then touch a metal doorknob, you get shocked. This happens due to the transfer of electrons from the carpet to the socks, resulting in a buildup of negative charge which is discharged when you touch the grounded doorknob.

Explanation:

When you vigorously rub your wool socks on a carpeted floor, you transfer electrons from the carpet to the socks through friction. This creates a buildup of negative charge on the socks. When you then touch a metal doorknob, which is grounded, the excess electrons on your socks quickly flow to the doorknob, resulting in a sudden discharge of static electricity and a shock.