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Phy 138 - Midterm 2 Solutions

# Phy 138 - Midterm 2 Solutions - Name Midterm 1 Phy138...

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1 2 Name: Midterm 1- Phy138 Summer1- 2008 PLACE ANSWERS IN SPACES PROVIDED FOR EACH PROBLEM. FAILURE TO DO SO WILL RESULT IN THE PROBLEM BEING CONSIDERED INCORRECT. Consider the forces shown below. What is the net force in the form F = FxL + Fyj? 6N 10N X I . ___________ ~An_s~" {fOAJ) .. 14 ,.~)-:\ -,------------ ----------------, A handgun fires a 0.015 kg bullet with a speed of 450 m/s. What is the kinetic energy of the bullet after it emerged from the handgun? L------,---I, Ans:1 ~ IS .. 20J J .,. /S;l.o J

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3 4 A 10 6 kg train accelerates from rest to 25 m/s over a distance of 2000 m. What is the average force acting on the train during this period? 0- Answer: /.S"(, ~(O IV Ale:;. LJ i,",,-1r~~FJ "2.. _Ar"1. _ .(10"1:).)( :;ls:~2 F" '/)...{ - - ::z.. ( ;2..00 0 ...... ') = I. .se- X 10 ~ !J A 100 kg sign hangs from the end of a 10 m long horizontal pole. The pole is supported by a cable that is at an angle of 25 0 with respect to the horizontal. What is the tension in the cable? Answer: :;2.3~o N T f"i .. e ,. "... ~ T= J'\ot~. Si",9 ~ (iOOJ:l)(f.Y~) .. 4i..;J.S 3 ~ ~.32 XIO N u __ s==
5 6 A 1.53 kg object has two forces acting on it. The first force is 120 N at an angle of 4S n with respect to the x-axis. The second force is 120 N at an y angle of 315 0 with respect to the x~axis.

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