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3 years ago

Which organelles is used to transport materials through the cell

Physics

1 answer:

Tatiana [17]3 years ago

6 0

Hello.

The answer is <span><span>cell membrane.

Have a nice day</span></span>

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Consider two slides, both of the same height. One is long and the other is short. From which slide will a child have a greater f

Lunna [17]

Answer:

The final speed will be the same for the children on the shorter side and on the longer side.

Explanation:

This is because since the they are the same distance above the ground, their potential energy which is a function of mass, acceleration due to gravity and vertical height are the same.

PE = Mass × gravity × vertical height

At this point, we can deduce that the horizontal length of the slide has no effect on the potential energy. Only the vertical height does.

All this potential energy is converted to kinetic energy at the end of the slide. Since the potential energy is the same, then the kinetic energy will be the same and thus their velocity is the same.

Mathematically, consider that PE = mgh and KE = $\frac{1}{2}$ m $v^{2}$

at the bottom of the slide, since energy has to be conserved, PE must be equal to KE.

mgh = $\frac{1}{2}$ m $v^{2}$

final velocity of the child , v = $\sqrt{2gh}$

It shows the final velocity is only a function f acceleration due to gravity and height.

Thus, making their velocities equal.

8 0

3 years ago

What has more thermal energy? A giant, frozen iceberg or a swimming pool filled with boiling water? Explain.

padilas [110]

Boiling water has a lot more heat than the oven's air (even though the air has a higher temperature). ... A match has a greater temperature than the iceberg because the average molecule in the match is moving faster than the average molecule in the iceberg

5 0

3 years ago

Which represents potential energy?

uysha [10]

C) is the correct answer.

8 0

4 years ago

Read 2 more answers

If you sit on a skateboard and push against a brick wall, what would happen? Why do you think this?

Troyanec [42]

Answer:

well when if you are sitting down and then push off of the brick wall you will be backwards so you can't see anything so you might hit someone or something so you would have to be careful

Explanation:

the reason why i think this is because i have a brother who skateboard and he wants to help me get better and when we are just playing we sit down on the skateboard and push off things and ran into a pole because i was backwards and wasn't paying attention so that's why i think that

7 0

3 years ago

How much force is needed to slow down a 15 kg car traveling at 60 m/s to 15 m/s in 10 seconds?

goldfiish [28.3K]

Answer:

The force needed to slow down the car is, F = 67.5 N

Explanation:

Given data,

The mass of the car, m = 15 kg

The initial velocity of the car, V = 60 m/s

The final velocity of the car, v = 15 m/s

The time period of deceleration, t = 10 s

The difference in the momentum of the car is,

mV - mv = 15(60 - 15)

= 675 kg m/s

The rate of change in momentum of the car gives the force acting on it.

F = (mV - mu) / t

Substituting the values,

F = 675 / 10

= 67.5 N

Hence, the force needed to slow down the car is, F = 67.5 N

3 0

3 years ago