lecture_questions_prelim1

# lecture_questions_prelim1 - An object moves along the x...

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An object moves along the x axis as shown below. At what time is v =0 ? t x t 1 t 5 t 4 t 3 t 2 A. t1 B. t2 C. t3 D. t4 E. t5 t x t 1 t 5 t 4 t 3 t 2 An object moves along the x axis as shown below. At what time does the velocity v has its largest positive value? A. t1 B. t2 C. t3 D. t4 E. t5 t x t 1 t 5 t 4 t 3 t 2 An object moves along the x axis as shown below. At what time is the speed of the object the largest ? A. t1 B. t2 C. t3 D. t4 E. t5 t x t 1 t 5 t 4 t 3 t 2 An object moves along the x axis as shown below. At what time is the object's speed decreasing ? A. t1 B. t2 C. t3 D. t4 E. t5

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At t =0 the velocity of a particle is 2 m/s. If its acceleration a (t) is as shown, what is its velocity at t =6s ? a (m/s 2 ) t (s) 1 4 26 v ( t =6s) =? A. 2 m/s B. 4 m/s C. 6 m/s D. 7 m/s E. 8 m/s v (m/s) t (s) 5 2 13 At t =0 the position of a particle is x =-5 m. If its velocity v ( t ) is as shown, what is its position at t=3 s ? x ( t =3s) = ? A. -5 m B. 0 m C. 2.5 m D. 5 m E. 7.5 m When a traffic light turns green at t =0, a car moves forward from rest at x =0 and eventually comes to a stop at the next red light at t =ts. Which of the following x-t graphs could describe the motion of the car? (Pick one.) t x (A) t s t (D) t s t x (B) t s t x (C) t s Which of the following x - t graphs could describe the motion of a simple pendulum? t x (A) (D) t x (C) t x (B) t x
t x For a pendulum with x ( t ) as shown, which is the correct v - t graph? t v (A) t v t v (B) t v (C) (D) A cart is released from rest at t =0 from the top of a ramp. Which of the following is a possible v ( t ) for the cart? Assume + x is down the ramp. t v t v t v (A) v t (B) (C) (D) Which of the following v - t graphs best describes the horizontal motion of a foot relative to the ground during ordinary walking? v t v t v t v t (A) (B) (C) (D) The speed of sound is v s 340 m/s. What is the time delay between the pulse from the ranger and the echo detected by the ranger for an object 3.4 m away? time delay t = ? 1. 200 s 2. 100 s 3. 50 s 4. 20 ms 5. 10 ms

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The speed of sound is v s 340 m/s. If the echo from a moth is received t echo =20 ms after a bat's "chirp", what is the distance d between the moth and the bat? d =? 1. 1.7 m 2. 3.4 m 3. 6.8 m 4. 13.6 m 5. 33 m A ball is thrown straight up and is caught at the same height at which it left the thrower’s hand. Take the positive y direction to be up. Which graph best represents the ball’s flight? 0 t v 1 . 0 t v 2. 0 t v 3. 0 t v 4. The time for a rock to drop from the Suspension Bridge to the floor of Fall Creek Gorge is measured to be ~3 s. What is the rock's speed when it hits the ground? speed = ? A. 10 m/s B. 20 m/s C. 30 m/s D. 40 m/s E. 50 m/s The time for a rock to drop from the Suspension Bridge to the floor of Fall Creek Gorge is measured to be ~3 s. How high is the bridge above the gorge floor? h = ? A. 30 m B. 45 m C. 60 m D. 75 m E. 90 m
Suppose that the height of the Suspension Bridge were doubled.

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## lecture_questions_prelim1 - An object moves along the x...

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