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exam-M11-2 - PHY 2048 Midterm Exam Spring 2011 2 Use g =...

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PHY 2048 Midterm Exam Spring 2011 Use g = 9.80 m/s . 2 1. [20 points] A 56 kg astronaut drifting with a velocity of (+ 1.86 ) m/s is holding \$ j a 9.86 kg module for the space station. She throws the module to another astronaut at a velocity of ( 2.59 – 2.38 ) m/s. \$ i \$ j (A) Find the (vector) velocity of the first astronaut after she threw the module. (B) Calculate the work done by the first astronaut when throwing the module. 2. [10 points] The position of a 1.87 kg mass is given by x(t) = (3.4 m) cos( [6.1 s -1 ] t ), where x is in m when t is in s. Determine the velocity of this mass. Give your answer as a function of time with numerical values specified with the correct number of significant figures and units. 3. [10 points] An electric motor produces a power of 68.2 W on the drive wheels of a 7.33 kg cart. If the cart is moving at 3.87 m/s, what is its acceleration at that moment? 4. [15 points] Given that a net force of ( – 30.5 + 21.8 ) N acts on a 3.76 kg mass \$ i \$ j that is initially moving at = ( 13.6 – 18.4 ) m/s, r v \$ i \$ j (A) calculate the acceleration of the mass

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exam-M11-2 - PHY 2048 Midterm Exam Spring 2011 2 Use g =...

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