Dynamics Name PHYS-2053 11. Which statement best explains why the weight of an o
ID: 1583882 • Letter: D
Question
Dynamics Name PHYS-2053 11. Which statement best explains why the weight of an object of mass m is different on Mars than it is on the Earth? de) The mass of Mars is different from that of Earth. ab) The radius of Mars is different from that of Earth be) The constant G is different on Mars. ad) The mass m will be different on Mars. ac) The masses & radii of Mars & Earth are different. 12. Complete the following statement: An inertial reference frame is one in which: a) the inertia of objects within the frame are zero. b) the frame is accelerating. e) the acceleration due to gravity is 9.8 ms d) Newton's Laws of motion is valid. e) Newton's third law of motion is not valid. 13. Complete the following statement: A collision is clastic if a) the objects are made of rubber b) the objects stick together. c) the final kinetic energy is zero. d) the final momentum is zero. e) the total kinetic energy is conserved. 14. A 3 kg ball has a velocity of 12 m's downward just before it strikes the ground & bounces up with a velocity of 8 mis upward. What is the change in momentum of the ball? ae) 60 kg-m/s, downward bd) 12 kg-m/s, downward ce) zero kg-ms ac) 12 kg-m/s, upward be) 60 kg-mis, upward 15. When the net force that acts on a hockey puck is 20 N, the puck accelerates at a rate of 10 mis What is the mass of the puck? ac) 2 kg de) 2 kg bd) .1 kg ab) 1 kg ed) 5 kg Hartley Spr 17Explanation / Answer
11) mass & radii of mars and earth are different(ac)
12) Newtons law of motion is valid (d)
13) total kinetic energy is conserved (e)
14) change in momentum=m(v2-v1)=3x(8-(-12))=60 kg-m/s,upwards(bc)
15) m=F/a=20/10=2Kg (ac)
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