1. Which pair is correct? (A) Work (W) measured in Newtons (N) (B) Work (E) measured in Watts (W) (C) Power (W) measured in Watts (W) (D) Work (W) measured in Joules (J) 2. Find the work done if a father pushes his daughter in a toboggan with a force of 500 N for 20 m. (A) 10000 J (B) 1000 J (C) 25 J (D) 2.5 J 3. Find the power of a snowblower which does 1.8 MJ of work in 0.600 hours. (A) 3W (B) 3 x 106 W (C) 833 W (D) 5 x 104 W 4. Find the work done while applying a force of 20 N [right] to a 0.4 kg puck as it slides along a frictionless surface from rest to 10.0 m/s in 0.2 s. (A) 2.0 J (B) 10.0 J (C) 20.0 J (D) 40.0 J 5. Jake the delivery person pushes a box up a ramp, exerting a force of 350.0 N. He walks up the ramp for 25.0 m. If the box has a mass of 50.0 kg, what is the height of the ramp? Ignore friction. (A) 12250 N (B) 8750 N (C) 490 N (D) 18 N
P:\02 Physics 2204\Unit 3 W ork Power Energy\Q uizzes\Q uiz #07 (power,work,energy).wpd
22 Feb 11
6. (A)
A lawnmower is pushed with a force of 3200 N directed at an angle of 30/ as shown below. Ignoring friction, how much work is done in pushing the lawnmower 12.0 m?
(B)
If the force of friction in problem a) were 1350 N, how much work would be done by friction?
[2]
[1]
7.
A 1500 kg car and a 300 kg motorcycle race from one stoplight to the other. The car gets there in 6.0 s, while the motorcycle gets there in 4.0 s. Which vehicle generated more power? Explain your answer.
[2]
P:\02 Physics 2204\Unit 3 W ork Power Energy\Q uizzes\Q uiz #07 (power,work,energy).wpd
22 Feb 11
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Name: ____________________________
P:\02 Physics 2204\Unit 3 W ork Power Energy\Q uizzes\Q uiz #07 (power,work,energy).wpd
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