26. Work - PE

26. Work - PE

Multiple Choice

Stewie, with a mass of 9 kg jumps and hits the ceiling which is 1.9 meters above the bed.

How much work does he do against gravity?

• 17.1 J

• 168 J

• 88.2 J

Multiple Choice

Stewie, with a mass of 9 kg jumps and hits the ceiling which is 1.9 meters above the bed.

He does this in 0.26 seconds. Calculate the power of his jump.

• 645 W

• 66 W

• 339 W

• 44 W

Multiple Choice

A 100 kg jaguar carries a 90 kg deer up 6.5 meter into a tree. How much work does the jaguar need to do to get itself and the deer up on the tree?

• 1,235 J

• 650 J

• 6,370 J

• 12,103 J

Multiple Choice

A 100 kg jaguar carries a 90 kg deer up 6.5 meter into a tree.

He does this in 0.8 seconds. How much power does the jaguar have?

• 15,129 J

• 15,129 W

• 1,544 W

• 1,544 J

Multiple Choice

A forklift raises a 500 kg package from the second shelf at 1 meter up to the top shelf at 6 meters. How much work has been done to get the package up there?

• 29,400 J

• 18,000 J

• 24,500 J

• 15,000 J

Multiple Choice

How much work does it take to get a this crazy lady up the stairs, if she has a mass of 65 kg?

• 1,210 J

• 1,210 W

• 123.5 W

• 123.5 J

Multiple Choice

The higher up above the ground an object is, the ________ its potential energy

• greater

• smaller

Multiple Choice

What has the most potential energy?

• A 1 kg bird on top of a 3 m tree

• A 1 kg bird sitting on a garden chair

• A 1 kg bird on the ground

Multiple Choice

Suppose a 8.5 x 10⁵ kg roller coaster starts at the top of the largest drop of 60 meters. How much potential energy does the car have up there?

• $5.1\cdot10^7\ J$

• $4.998\cdot10^8\ J$