At time t = 0 a baseball that is 5 ft above the ground is hit with a bat. The ball leaves the bat with a speed of 80 ft / s at an angle of 30 ° above the horizontal. (a) How long will it take for the baseball to hit the ground? Express your answer to the nearest hundredth of a second. (b) Use the result in part (a) to find the horizontal distance traveled by the ball. Express your answer to the nearest tenth of a foot.
At time t = 0 a baseball that is 5 ft above the ground is hit with a bat. The ball leaves the bat with a speed of 80 ft / s at an angle of 30 ° above the horizontal. (a) How long will it take for the baseball to hit the ground? Express your answer to the nearest hundredth of a second. (b) Use the result in part (a) to find the horizontal distance traveled by the ball. Express your answer to the nearest tenth of a foot.
At time
t
=
0
a baseball that is 5 ft above the ground is hit with a bat. The ball leaves the bat with a speed of
80
ft
/
s
at an angle of
30
°
above the horizontal.
(a) How long will it take for the baseball to hit the ground? Express your answer to the nearest hundredth of a second.
(b) Use the result in part (a) to find the horizontal distance traveled by the ball. Express your answer to the nearest tenth of a foot.
An airplane is flying at a constant altitude of 3 miles and a constant speed of 500 miles per hour on a straight course that will take it directly over an elephant on the ground. How fast is the angle of elevation of the elephant’s line of sight increasing when the distance from elephant to the plane is 5 miles? Give your answer in radians per minute.
A policeman is sitting at a railroad crossing as a train goes by along a track that forms a 75° angle with the roadway. The radar gun pointing forward in his car indicates that the train is moving away at speed 11 mph. (a) What is the actual speed of the train along the track? (b) Would the radar gun ever read zero when a train is going across the road? Would it ever read a value greater than the actual speed? Explain.
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