Constants Part A Pelicans tuck their wings and free-fall straight down when diving for fish. Suppose a pelican starts its dive from a height of 20.0 m and cannot change its path once committed If it takes a fish 0.25 s to perform evasive action, at what minimum height must it spot the pelican to escape? Assume the fish is at the surface of the water. Express your answer using two significant figures. View Available Hint(s) 四) ? min

Constants Part A A canoe has a velocity of 0.480 m/s southeast relative to the earth. The canoe is on a river that is flowing at 0.560 m/s east relative to the earth. (Figure 1) Find the magnitude of the velocity vc/r of the canoe relative to the river. Express your answer in meters per second. View Available Hint(s) Figure 0) m/s c/r Submit Part B Complete previous part(s) rle 45° Provide Feedback

! Required information A dolphin wants to swim directly back to its home bay, which is 0.800 km due west. It can swim at a speed of 6.20 m/s relative to the water, but a uniform water current flows with speed 2.83 m/s in the southeast direction. What direction should the dolphin head? Enter the angle in degrees where positive indicates south of west and negative indicates north of west. How long does it take for the dolphin to swim the 0.800-km distance home? min

Constants A shot-putter throws the "shot" (mass = 7.3 kg) with an initial speed of 14.6 m/s at a 31.0 ° angle to the horizontal. Part A Calculate the horizontal distance traveled by the shot if it leaves the athlete's hand at a height of 2.20 m above the ground. Express your answer using three significant figures and include the appropriate units. HẢ ? d = Value Units

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Required information A train, traveling at a constant speed of 22.0 m/s, comes to an incline with a constant slope. While going up the incline, the train slows down with a constant acceleration of magnitude 1.40 m/s2. Which of the following is a graph of vy vs. twhere the x-axis points up the incline? Multiple Choice Vx (m/s) 22 18 14 10 4 8 t(s) 2.

EXERCISE Suppose a particle moves along the x-axis. Its x-coordinate varies with time according to the expression x = 34.0 + 4.0t + 1.2t, where x is in meters and t is in seconds. Hint (a) Determine the displacement Ax of the particle (in m) in the time interval t = 9 s to t = 20 s. Ax= m (b) Calculate the average velocity (in m/s) in the time interval t = 9 s to t = 20 s. v = m/s (c) Find the instantaneous velocity of the particle (in m/s) at t = 18.4 s. m/s

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Page > of 2 ZOOM + Free-fall Practice Problems Name 1) A stone is dropped from the top of a cliff. It is seen to hit the ground below after 3.50 s. How high is the cliff? [60.0 m] 2) Calculate how long it took King Kong to fall straight down from the top of the Empire State Building (380 m high). What was his velocity just before “landing"? [8.81 s; 86.3 m/s] 3) A car rolls gently (vo = 0) off a vertical cliff. How long does it take to reach a speed of 90 km/hr? [2.6 s] 4) A foul ball is hit straight up into the air with a speed of 25 m/s. (a) How high does it go? [31.9 m] (b) How long is it in the air, that is, how long does it take to go up and come back down again? [5.1 s] 5) A ball is thrown vertically downward with a velocity of 15 m/s from the roof of a building that is 22 m high. How long does it take to hit the ground below? How fast was it going when in hit? [1.08 s; 25.6 m/s] 6) A ball is thrown vertically upward with a velocity of 15 m/s from the roof of a building that is…