1-If your friend traveled a distance of 158 miles in 5.1 hours, what was his ave
ID: 2286052 • Letter: 1
Question
1-If your friend traveled a distance of 158 miles in 5.1 hours, what was his average speed in miles per hour?
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2-A car is going around in a circle with a constant speed in an otherwise empty parking lot. What are the size and direction of the acceleration of the car?
3-A car is going around in a circle with an increasing speed in an otherwise empty parking lot. What are the size and direction of the acceleration of the car?
There is no acceleration because the speed is constant.
The acceleration points forward to keep the car moving.
The acceleration has a component that points forward and a component that points to the center of the circle.
The acceleration points toward the center of the circle.
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4-What is the average speed (in m/s) of an object that moves 57 meters in 14 seconds?
A-There is no acceleration because the speed is constant.
B-The acceleration points forward to keep the car moving.
C-The acceleration has a component that points forward and a component that points to the center of the circle.
D-The acceleration points toward the center of the circle.
Explanation / Answer
1. speed = distance/time = 158miles/5.1hour = 30.98 miles per hour
2.As car is going around in a circle, so centripetal force(v^2/r) will act on car toward the center of the circle
so,
D. The acceleration points toward the center of the circle.
3. As car is going around in a circle, so centripetal force(v^2/r) will act on car toward the center of the circle
and due to increasing speed, acc = dv/dt acts forward
so,
C. The acceleration has a component that points forward and a component that points to the center of the circle.
4. speed = distance/time = 57m/14s = 4.071 m/s
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