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Chapter 2: Motion along a Straight Line

Fundamentals Of Physics
Pages: 13 - 39

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123 Questions for Chapter 2: Motion along a Straight Line

  1. Question: A hot-air balloon is ascending at the rate of12m/sand role="math" localid="1662959960903" 80misabove the ground when a package is dropped over the side. (a) How long does the package take to reach the ground? (b) With what speed does it hit the ground?

    Found on Page 35
  2. A steel ball is dropped from a building’s roof and passes a window, taking 0.125 sto fall from the top to the bottom of the window, a distance of 1.20 m. It then falls to a sidewalk and bounces back past the window, moving from bottom to top in 0.125 s. Assume that the upward flight is an exact reverse of the fall. The time the ball spends below the bottom of the window is 2.00s. How tall is the building?

    Found on Page 36
  3. Question: A basketball player grabbing a rebound jump76.0 cm vertically. How much total time (ascent and descent) does the player spend (a) in the top15.0cmof this jump and (b) in the bottom 15.0 cm? (The player seems to hang in the air at the top.)

    Found on Page 36
  4. Aparachutist bails out and freely falls50m. Then the parachute opens, and there after she decelerates at2.0m/s2She reaches the ground with a speed of3.0m/s. (a) How long is the parachutist in the air? (b) At what height does the fall begin?

    Found on Page 39
  5. A ball is thrown down vertically with an initial speed of from a height of . (a) What is its speed just before it strikes the ground? (b) How long does the ball take to reach the ground? What would be the answers to (c) part a and (d) part b if the ball were thrown upward from the same height and with the same initial speed? Before solving any equations, decide whether the answers to (c) and (d) should be greater than, less than, or the same as in (a) and (b).

    Found on Page 39
  6. Question: If a baseball pitcher throws a fastball at a horizontal speed of 160 Km/hr,how long does the ball take to reach homeplate 18.4 maway?

    Found on Page 39
  7. Question: A proton moves along theaxis according to the equation x = 50t + 10t2 , where xis in meters and tis in seconds. Calculate (a) the average velocity of the proton during the first 3.0 sof its motion, (b) the instantaneous velocity of the proton at t = 3.0 s, and (c) the instantaneous acceleration of the proton at t = 3.0 s . (d) Graph xversus tand indicate how the answer to (a) can be obtained from the plot. (e) Indicate the answer to (b) on the graph. (f) Plotvversus tand indicate on it the answer to (c).

    Found on Page 39
  8. Question: A motorcycle is moving at 30 m/swhen the rider applies the brakes, giving the motorcycle a constant deceleration. During the 3.0 s interval immediately after braking begins, the speed decreases to 15 m/s. What distance does the motorcycle travel from the instant braking begins until the motorcycle stops?

    Found on Page 39
  9. Question: A shuffle board disk is accelerated at a constant rate from rest to a speed of 6.0 m/sover a 1.8 mdistance by a player using a cue. At this point the disk loses contact with the cue and slows at a constant rate of 2.5 m/s2until it stops. (a) How much time elapses from when the disk begins to accelerate until it stops? (b) What total distance does the disk travel?

    Found on Page 39
  10. To set a speed record in a measured (straight line) distance d, a race car must be driven in one direction (in timet1) and then in the opposite direction (in timet2). (a) To eliminate the effects of wind and obtain the car’s speedin a windless situation, should we find the average ofdt1anddt2(method 1) or should we divide d by the average oft1andt2? (b) What is the fractional difference in the two methods when a steady wind blows along the car’s route and the ratio of wind speedVwto car’s speedVcis 0.0240

    Found on Page 33

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