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**help with problems!General physics**

I really need help with my physics test. Its a home test! Can anyone please help me.

Problem 1:

A Ferris wheel has radius 5.o m and makes one revolution in 8 seconds. A person weighing 670 N is sitting on one of the benches attached at the rim of the wheel. What is the apparent weight (that the normal force exerted on her by the bench) of the person as she passes through the highest point of her motion??

Answer: i got 723.6 N, can it be right?

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Problem 2:

An 8.0 kg block is released from rest, v1 = 0 m/s, on a rough incline, which has an angle of 40 from the horizontal. The block moves a distance of 1.6 m down the incline, in a time interval of 0.80 s, and acquires a velocity of v2 = 4.0 m/s.

The average rate at which work done by the weight is closest to...

the Answer is +80j, but how do you get it?

-----------------------------------------------------------------------Problem 3:

Two objects, one of mass m, other of mass 2 m, are dropped from the top of a building. When they bit the ground:

Question:

a) both will have the same kinetic energy

b)the heavier one will have twice the kinetic energy of the lighter one

c)the heavier one will have 4 times the kinetic energy of the lighter one

d)the heavier onewill have half the kinetic energy of the lighter one.

e)the heavier one will have one fourth the kinetic energy of the lighter one.

?

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Problem 4:

Which of the following is an accurate statement?

A) Kinetic Energy is always positive

B) poptential energy is always positive

C) Total energy is always positive

D) None of these is true

E) More than one of these is true

// I know that kinetic energy is always positive, potential ? no, it can change, total? is it always constant?

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