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3 years ago

I need help with this question it’s potential energy and kinetic energy

Physics

1 answer:

yKpoI14uk [10]3 years ago

8 0

Answer:

A bowling ball sitting on the rack: Potential

Sitting in the top of a tree: Potential

The chemical bonds in sugar: Potential

An archer with his bow drawn: Potential

A baseball thrown to second base: Kinetic

The wind blowing through your hair: Kinetic

A volleyball player spiking a ball: Kinetic

A bicyclist pedaling up a hill : Kinetic

A bowling ball rolling down the alley: Kinetic

Walking down the street: Kinetic

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After a projectile is fired into the air, what is the acceleration in the x-direction? (Assume no air resistance.)

Gre4nikov [31]

Without air resistance, there is no horizontal force on the projectile,
so it has no horizontal acceleration. The answer is "zero".

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3 years ago

Read 2 more answers

A 0.017-kg acorn falls from a position in an oak tree that is 18.5 meters above the ground.

Marianna [84]

Answer:

Part a)

Final speed of the corn is 19.05 m/s

Part b)

Kinetic energy of the corn is 3.1 J

Explanation:

Part a)

As we know that the initial position of the corn is

h = 18.5 m

now we also know that it will fall from rest and moving under constant acceleration so we will have

$v_f^2 - v_i^2 = 2 a d$

$v_f^2 - 0 = 2(9.81)(18.5)$

$v_f = 19.05 m/s$

Part b)

Kinetic energy of the corn is given as

$K = \frac{1}{2}mv^2$

$K = \frac{1}{2}(0.017)(19.05)^2$

$K = 3.1 J$

4 0

4 years ago

The car has a constant deceleration of 4.20 m/s^2. If its initial velocity was 24.0 m/s, how long does it take to come to a stop

nalin [4]

Answer:

The time is 5.71 sec.

Explanation:

Given that,

Acceleration $a= -4.20 m/s^2$

Initial velocity = 24.0 m/s

We need to calculate the time

Using equation of motion

v = u+at[/tex]

Where, v = final velocity

u = inital velocity

t = time

a = acceleration

Put the value into the formula

$0 =24.0 +(-4.20)\times t$

$t = \dfrac{-24.0}{-4.20}$

$t=5.71\ sec$

Hence, The time is 5.71 sec.

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4 years ago

Jenny is very nervous about giving her speech, and when she stands up in

timurjin [86]

Answer:

Stage fright

Explanation:

Stage fear is one that a person experiences when he feels exposed to what others are going to say. This feeling is characterized by the fear of public speaking. Some common causes are large crowds or stress associated with an important presentation where people can stutter and do a poor job.

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3 years ago

How is the mass and speed of a particle related to its kinetic energy and temperature?

Brut [27]

Higher the mass will cause more friction which will make its temperature higher and it would also need more kinetic energy to move at a higher speed<span />

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3 years ago