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Hi, I am having trouble doing these problems listed below. Please show me how to solve
these problems for future reference. Thank you very much.
I would like for you to show me all of your work/calculations and the correct answer
to each problem.
15. A 5.0kg block at rest on a frictionless surface is acted on by forces F
1
=
5.5 N
and F
2
=
3.5 N.
What additional horizontal force will keep the block at rest?
Answer: F
3
= (7.6 N)
^
x
19. The engines of most rockets produce a constant thrust (forward force). However,
when a rocket is fired into space, its acceleration increase with time as the engine
continues to operate. Is this situation a violation of Newton’s second law? Explain.
23. What is the mass of an object that accelerates at 3.0 m/s
2
under the influence of a 5.0
N net force?
Answer: 1.7 kg
29. What is the weight of an 8.0kg mass in newtons? How about in pounds?
Answers: 78 N, 18 lb (Please show your calculations)
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 Spring '10
 dr.brosky

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