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A flock of seagulls has decided to mount an organized A flock of seagulls has decided to mount an organized response to the human overpopulation of their favorite beach. One tactic popular among the innovative radicals is bombing the sunbathers with clams. A gull dives with a speed of 16 m/s, at an angle of […]

A fireworks rocket explodes at height h, the peak of its A fireworks rocket explodes at height h, the peak of its vertical trajectory. It throws out burning fragments in all directions, but all at the same speed v. Pellets of solidified metal fall to the ground without air resistance. Find the smallest angle that […]

A fir hose held near the ground shoots water at A fir hose held near the ground shoots water at a speed of 6.8 m/s. At what angle(s) should the nozzle point in order that the water land 2.0m away (Fig 3-33)? Why are there two different angles? Sketch the two trajectories. Is this the […]

At t = 0, a stone is dropped from a At t = 0, a stone is dropped from a cliff above a lake; 1.6 seconds later another stone is thrown downward from the same point with an initial speed of 32 m/s. Both stones hit the water at the same instant. Find the height […]

A firefighter, a distance d from a burning building, directs A firefighter, a distance d from a burning building, directs a stream of water from a fire hose at angle i above the horizontal as in Figure P4.20. If the initial speed of the stream is vi, at what height h does the water strike […]

A dart is thrown straight up. After it leaves the player’s A dart is thrown straight up. After it leaves the player’s hand, it steadily loses speed as it gains altitude until it lodges in the ceiling of the game room. Draw the dart’s velocity vector at times t1 and t2, where ?t = t2 […]

A faulty model rocket moves in the xy-plane A faulty model rocket moves in the xy-plane (the positive y direction is vertically upward). The rocket’s acceleration has components ax (t) = at2 and ay (t) = B – yt where a = 2.50 m/s4, B = 9.00 m/S2, and -y = 1.40 m/S3. At t […]

A dog running in an open field has components A dog running in an open field has components of velocity v, = 2.6 m/s and Vy = -1.8 m/s at t, = 10.0 s. For the time interval from f, = 10.0 s to 12 = 20.0 s, the average acceleration of the dog has […]

A physics professor leaves her house A physics professor leaves her house and walks along the sidewalk toward campus. After 5 min it starts to rain and she returns home. Her distance from her house as a function of time is shown in Fig. 2.32. At which of the labeled points is her velocity (a) […]

A rigid ball traveling in a straight line A rigid ball traveling in a straight line (the x-axis) hits a solid wall and suddenly rebounds during a brief instant. The v,-t graph in Fig. 2.46 shows this hall’s velocity as a function of time. During the first 20.0 s of its motion, find (a) The […]