each) [8 points PART 1: Multiple Choice. On your bubble sheet, mark one choice f
ID: 2077359 • Letter: E
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each) [8 points PART 1: Multiple Choice. On your bubble sheet, mark one choice for eac the air, and tically upward in Questions 1 and 2 both apply to the following description: A ball is iLgocs an? allowed to fall back down. Air resistance is negligible. of the ball What can you say about the direction of velocity and the direction acceleration of (A) Both the velocity and the acceleration are zero. (B) Both the velocity and the acceleration are directed up (C Both the velocity and the acceleration are directed down D) The velocity is directed up, but the acceleration is directed down (E) The velocity is directed up, but the acceleration is zero. instant 2) What can you say about the direction of velocity and the direction of acceleration of the ball at the that the ball is ar its highest point? (A) Both the velocity and the acceleration are zero. (E) Both the velocity and the acceleration are directed up. eco Both the velocity and the acceleration are directed down. dD) The velocity is directed up, but the acceleration is directed down. a) The velocity is zero, but the acceleration is di down Jimmy is getting ice skating lessons from his dad, while skating, Jimmy accidentally crashes into his dad, who is at rest. What can you say about the magnitude of force that Jimmy exerts on his dad (Fion D) in comparison to the magnitude of force that the dad exerts on Jimmy (FD on Don J (B) Fron FD ons (CO Don J Small pulley (D) More information is needed 4) After an accident, your leg is in a cast and supported in a traction device, as shown to the right. What is the best 30.0° statement of the mathematical relationship between the magnitude of the tension in the rope and the magnitude of the force that the foot exerts on the pulley (F)? Assume that the pulley is frictionless and both the pulley and rope are very lightweight. A) F 2T cos (300) 250Explanation / Answer
a) when the object goes up, the velocity is along upward direction and the acceleration is always downward direction.
v is upward
a is downward
b) At the maximum height, the velocity is zero as the object needs to be change its direction and the acceleration is downward diection.
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