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3 years ago

When does PE equal KE?

1 answer:

4 0

PE equals KE when KE is 50%.

Like below:

E = PE + KE
E = 50 + 50
E = 100.

Remember, both KE and PE always have to add up to 100 so that is why PE is equal to KE when KE is 50% of energy.

Hope I helped. :)

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A solid cylinder (1 =1/2mr2 ) with a mass of 4.83 kg and a radius of 0.057 m starts

netineya [11]

Answer:

v = 7.32 m/s

Explanation:

The potential energy will convert to kinetic energy

½Iω² + ½mv² = mgh

Iω² + mv² = 2mgh

(½mR²)(v/R)² + mv² = 2mgh

½mv² + mv² = 2mgh

½v² + v² = 2gh

3v²/2 = 2gh

v² = 4gh/3

v² = 4(9.81)(4.10)/3

v² = 53.628

v = 7.323114...

v = 7.32 m/s

3 0

3 years ago

(Thanks in advance)

Dmitrij [34]

I would say it B) in the same direction feel free to ask me more question

5 0

3 years ago

Anyone please help thank you

Thepotemich [5.8K]

Answer:

A) earth

B) live

C) live

D) earth

Explanation:

hope i help

4 0

3 years ago

A 150 g baseball pitched at a speed of 45 m/s is hit straight back to the pitcher at a speed of 60 m/s. What is the magnitude of

abruzzese [7]

Answer:

The average force is 1578.94 N.

Explanation:

Given that,

Mass of baseball = 150 g

Speed = 45 m/s

Speed of pitcher = 60 m/s

Time = 9.5 ms

We need to calculate the average force

Using formula of impulse

$J=\Delta p$

$J=m\Delta v$ ...(I)

$J=F\Delta t$ ....(II)

From equation (I) and (II)

$F=\dfrac{m(v_{f}-v_{i})}{\Delta t}$

Where, m = mass of baseball

$v_{f}$ = final velocity

$v_{i}$ = Initial velocity

$\Delta t$ = time

Put the value into the formula

$F=\dfrac{150\times10^{-3}\times(60-(-40))}{9.5\times10^{-3}}$

$F=1578.94\ N$

Hence, The average force is 1578.94 N.

3 0

4 years ago

Read 2 more answers

What does amplitude mean

boyakko [2]

The maximum extent of a vibration, measured from the position of equilibrium.
The meaning of equilibrium is being in the position of physical balance.

8 0

4 years ago