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Q3: Two vectors lying in the xy plane are given by the equations A=51-21 and B-21-31. AxB equals: a) - 19k b) 11k c) 19k Q4: A stone is thrown vertically upward with an initial spood of 11 d) -1 - 11k

Q3: Two vectors lying in the xy plane are given by the equations A=51-21 and B-21-31. AxB equals: a) - 19k b) 11k c) 19k Q4: A stone is thrown vertically upward with an initial spood of 11 d) -1 - 11k

Physics for Scientists and Engineers
Physics for Scientists and Engineers
10th Edition
ISBN:9781337553278
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter7: Energy Of A System
Section: Chapter Questions
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physics, please solve question 3

Q1: If A=41-6 and B = 21 +10 then the vector C=2Ã-B has a magnitude of: a) 7.2 b) 42 c) 23 d) 64 Q2: A block of mass 0.3 kg is dropped from rest at a height 2 m directly above the top of a vertical spring having a force constant 100 N/m. The maximum compressed distance (in m) of the spring is a) 0.44 b) 0.22 c) 0.63 d) 0.38 Q3: Two vectors lying in the xy plane are given by the equations A=51-21 and B-21-31. AxB equals: a) -19k b) 11k c) 19k B= d) -11k Q4: A stone is thrown vertically upward with an initial speed of 14 m/s. It will rise to a maximum height (in m) of: a) 13.1 b) 9.8 c) 39.2 d) 19.4 Q5: The area under a velocity-time graph represents: a) speed b) change in acceleration c) change in velocity d) displacement Q6: An elevator has a mass of 1600 kg and is carrying 200 kg passengers. A constant friction force of 4000 N retards its motion upward. What power delivered by the motor (in W) is required to lift the elevator at a constant speed of 4 m/s? a) 4.33*10* b) 2.73*104 c) 8.80*104 d) 3.53*10* Q7: In a given displacement of a particle, its kinetic energy increases by 25 J while its potential energy decreases by 10J. determine the work of the nonconservative forces acting on the particle during this displacement. a)-15J b) 10 J c) 15 J d) -40 J Q8: A football player shot the ball at an angle of 40° above the horizontal at a speed of 8 m/s. How far (in m) will the ball reach in the horizontal direction? a) 22.6 b) 14.5 c) 9.8 d) 6.3 00
Transcribed Image Text:Q1: If A=41-6 and B = 21 +10 then the vector C=2Ã-B has a magnitude of: a) 7.2 b) 42 c) 23 d) 64 Q2: A block of mass 0.3 kg is dropped from rest at a height 2 m directly above the top of a vertical spring having a force constant 100 N/m. The maximum compressed distance (in m) of the spring is a) 0.44 b) 0.22 c) 0.63 d) 0.38 Q3: Two vectors lying in the xy plane are given by the equations A=51-21 and B-21-31. AxB equals: a) -19k b) 11k c) 19k B= d) -11k Q4: A stone is thrown vertically upward with an initial speed of 14 m/s. It will rise to a maximum height (in m) of: a) 13.1 b) 9.8 c) 39.2 d) 19.4 Q5: The area under a velocity-time graph represents: a) speed b) change in acceleration c) change in velocity d) displacement Q6: An elevator has a mass of 1600 kg and is carrying 200 kg passengers. A constant friction force of 4000 N retards its motion upward. What power delivered by the motor (in W) is required to lift the elevator at a constant speed of 4 m/s? a) 4.33*10* b) 2.73*104 c) 8.80*104 d) 3.53*10* Q7: In a given displacement of a particle, its kinetic energy increases by 25 J while its potential energy decreases by 10J. determine the work of the nonconservative forces acting on the particle during this displacement. a)-15J b) 10 J c) 15 J d) -40 J Q8: A football player shot the ball at an angle of 40° above the horizontal at a speed of 8 m/s. How far (in m) will the ball reach in the horizontal direction? a) 22.6 b) 14.5 c) 9.8 d) 6.3 00
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