Answer all questions below. Show all work in order to obtain full or artial ered

Question

Answer all questions below. Show all work in order to obtain full or artial eredit. Be neat. t is prohibited to use a cell-phone or other High-Tech device as a calculator Circle the correet answer, I. Which of the following controls can be used to make a car accelerate? (1) a. The steering wheel. b. the gas pedal. e. the brake pedal. d. all of the choices a,b&c.e.none; of the other choices. 2. When a mass travels in a circle at constant speed, its acceleration (1) a. Is zero because the speed is constant b. points along the arc of the circle c. points away from the circle's center. d. points towards the circle's center 3. Which object has the most ?.?.? (1) a. A 2kg ball thrown at 4m/s b. A 4kg ball thrown at /8 m/s c.A 8kg ball thrown at 2 m/s d. None 4. An 80 kg sprinter starts from rest and sprints on a level track, reachinga final speed of 6.5 m/s after 2.5 seconds. His average mechanical power is: a. 260W b. 89.0 W c. 676W d) 208 W 5. A 0.80 kg block traveling at +0.80m/s collides with a 0.60kg ball moving at -0.7 m/s. the collision is inelastic and the blocks are attached after colliding. What is the speed of the system after collision? (1) a. 0.75m/s b. 0.16m/s c. 2.07m/s d) 0.10m/s

Explanation / Answer

1.Gas pedal can be used to accelerate car

2.points towards circle center

3we know KE=0.5mv^2

so kinetic energy of a=b=c=16 J

so answer is None as all are equal

4.Power=Energy/time=0.5mv^2/time=676 W

5.v=(0.8*0.8-0.7*0.6)/1.4=0.16 m/s

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