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An airliner flies at a speed of 500 km hr with respect to the air The jet stream blows from west to east with a speed of 100 km hr What is the minimum time in which the airliner could fly 3000 km

An airliner flies at a speed of 500 km/hr with respect to the air. The jet stream blows from west to east with a
speed of 100 km/hr. What is the minimum time in which the airliner could fly 3000 km due west and then back
to its original starting position?
(A) 10.0 hr (B) 12.0 hr (C) 12.5 hr (D) 13.5 hr (E) 15.0 hr
77. A punter in a football game kicks the ball with an initial speed of 28.3 m/s at an angle of 60° with respect to the
ground. The ball is in the air for a total of 5.00 s before hitting the ground. If we assume that air resistance is
negligible, what would be the ball's horizontal displacement?
(A) 0 m (B) 14.2 m (C) 24.5 m (D) 70.8 m (E) 122.5 m
78. Starting from rest, object 1 falls freely for 4.0 seconds, and object 2 falls freely for 8.0 seconds. Compared to
object 1, object 2 falls:
(A) half as far (B) twice as far (C) three times as far (D) four times as far (E) sixteen times as far

 

Jun 21 2020 View more View Less

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