Assume that the Nile river is flowing exactly east with a speed of 7 mi/h. A man
ID: 1533143 • Letter: A
Question
Assume that the Nile river is flowing exactly east with a speed of 7 mi/h. A man is trying to cross to the other side of the bank. Assume the width of the river to be exactly 7 miles. Given that the man takes 1 hour to get to the other bank, what is the angle of his trajectory with respect to the North? 55.0 degree 67.5 degree 73.4 degree 58.0 degree 90.0 degree To get to a concert in time, a harpsichordist has to drive 135 miles in 2 hours, (a) If he drove at an average speed of 60.0 mi/h for the first 1.12 h, what must be his average speed for the remaining time? 86.0 mi/h 77.0 mi/h 75.3mi/h 67.9 mi/h A 2.00kg toy locomotive is pulling a 0.50 kg caboose. The frictional force of the track on the caboose is 0.75 N backward along the track. If the train (and caboose) is accelerating forward at 2.70 m/s^2, what is the magnitude and direction of the frictional force exerted by the track on the train? 9.79 N 7.75 N 10.73 N 7.50 N A boy swings in a tire swing. the tension in the rope is maximum At the highest point during the motionExplanation / Answer
The distance traveled in 1.12 hours is
1.12*60 = 67.2 miles due west
The distance remaining is 135 - 67.2 = 67.8 miles 30.0° south of west in 52.8 minutes
the speed for that distance is
67.8*60/52.8 = 77.05 miles per hour
For the whole trip, the average speed is
135/2.0 = 67.5 mi/hr