Chapter 6, work and energy (PART 1) Flashcards Preview

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Flashcards in Chapter 6, work and energy (PART 1) Deck (5):
1

What is the minimum work needed to push a 1000 kg car 270 m up along a 17.5° incline?

(a) Ignore friction.

(b) Assume the effective coefficient of friction retarding the car is 0.40?

(a) 795667.5 J

(b) 1805081.6 J

2

A box of mass 5.6 kg is accelerated from rest by a force across a floor at a rate of 2.0 m/s2 for 7.0 s. Find the net work done on the box.

548.8 J

3

A 290 kg piano slides 4.3 m down a 30° incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (Fig. 6-36). The effective coefficient of kinetic friction is 0.40.

http://www.webassign.net/giancoli/6-36.gif

(a) Calculate the magnitude of the force exerted by the man.

(b) Calculate the work done by the man on the piano.

(c) Calculate the work done by the friction force.

(d) What is the work done by the force of gravity?

(e) What is the net work done on the piano?

(a) 436.5 N

(b) -1876.95 J

(c) -4233.35 J

(d) 6110.3 J

(e) 0 J

4

How much work must be done to stop a 1090 kg car traveling at 110 km/h?

-508834.9 J

5

Jane, looking for Tarzan, is running at top speed (4.0 m/s) and grabs a vine hanging vertically from a tall tree in the jungle.

How high can she swing upward?

Does the length of the vine affect your answer?

.82 m

No