Question

Problem number 8,14,&20.

11. A softball player hits the ball and starts running toward first 21. I Which of the following moti base. Draw a motion diagram, using the particle model, show- ing her velocity vectors during the first few seconds of her run. diagram of Figure Q1.21? A. An ice skater gliding acros B. An airplane braking to a s C. A ear pulling away from a D. A pool ball bouncing off 12. A child is sledding on a smooth, level patch of snow. She encoun- ters a rocky patch and slows to a stop. Draw a motion diagram, using the particle model, showing her velocity vectors. 13. A skydiver jumps out of an airplane. Her speed steadily increases until she deploys her parachute, at which point her speed quickly decreases. She subsequently falls to earth at a constant rate, stopping when she lands on the ground. Draw a motion diagram, using the particle model, that shows her posi- tion at successive times and includes velocity vectors. FIGURE 01.21 22.1 A bird flies 3.0 km due What is the magnitude of th A. 2.0 km B. 3.0 km 14. Your roommate drops a tennis ball from a third-story balcony. It hits the sidewalk and bounces as high as the second story. Draw a motion diagram, using the particle model, showing the ball's velocity vectors from the time it is released until it reaches the maximum height on its bounce. 23. I Weddell seals make hol age on the oc one seal showed that it div ing, reaching a depth of 0. the speed of the diving se A. 0.60 m/s B. 1.0 m/s 80 down to for 15. A car is driving north at a steady speed. It makes a gradual 90 left turn without losing speed, then continues driving to the west. Draw a motion diagram, using the particle model, show- ing the car's velocity vectors as seen from a helicopter hovering over the highway E. 10 m/s 24. I A bird flies 3.0 kmc Another bird flies 2.0 km the angle between the net 16. Three displacement vectors have lengths I m, 2 m, and 4 m. A. 23 B. 34° Could they possibly add together to get a vector of length zero? 25. I Hicham El Guerrouj 17. Your friend Travis claims to have set the new world speed record for riding a unicycle. His top speed, he says, was 55 m/s. Do you believe him? Explain. the 1500 m running ra 51.9 s. What was his av A. 14.2 mph C. 17.2 mph 26. I Compute 3.24 m + Multiple-Choice Questions cant figures. 18. I A student walks 1.0 mi west and then 1.0 mi north. After- ward, how far is she from her starting point? A. 1.0mi B. 1.4mi C. I.6mi D. 2.0 mi C. 3.772 m 19. I You throw a rock upward. The rock is moving upward, but it 27. 1 An American forot To the correct numb is slowing down. If we define the ground as the origin, the posi- tion of the rock is- and the velocity of the rock is A. positive, positive C. negative, positive A. 5351 m2 C. 5351.17 m2 B. positive, negative D. negative, negative 28. I The earth forme seconds? A. 1.67 x 1012 s C. 2.40 x 1015s 29. l An object's a of its mass to 5.94 x 104 kg, a earth's average d A. 5.50 x 10 kg C. 5.50 x 10°k 20. I Which of the following motions could be described by the motion diagram of Figure Q1.20? A. A hockey puck sliding across smooth ice B. A cyclist braking to a stop. C. A sprinter starting a race D. A ball bouncing off a wall FIGURE 01.20