1. A car traveling with constant speed rounds a curve in the highway. Is the acc
ID: 2124627 • Letter: 1
Question
1. A car traveling with constant speed rounds a curve in the highway. Is the acceleration of the car equal to zero in this situation?
A. Yes, the car is traveling around the curve with constant speed. If the speed is not changing, then its
acceleration is equal to zero.
B. No, as the car rounds the curve the direction of its velocity changes. Since there is a change in the
velocity, it must have a non-zero acceleration.
C. C. There is not enough information to determine whether or not the acceleration is equal to zero.
2. A car travels with an average speed of 16 m/s.
(a) What is this speed in km/s?
_____ km/s
(b) What is this speed in km/h?
_______ km/h
(a) What is his velocity at the end of this time?
______ m/s
(b) What distance does the runner cover during this process?
________ m
4. A driver drives for 1.7 hours at an average speed of 49 MPH. What distance does she travel in this time?
_______ mi
5. A person in a hurry averages 51 MPH on a trip covering a distance of 211 miles. What time was required to travel that distance?
___ hr
A. Y
A. Yes, the car is traveling around the curve with constant speed. If the speed is not changing, then its
acceleration is equal to zero.
B. No, as the car rounds the curve the direction of its velocity changes. Since there is a change in the
velocity, it must have a non-zero acceleration.
C. C. There is not enough information to determine whether or not the acceleration is equal to zero.
A car moves along a straight line so that its position (distance from some starting point) varies with time as described by the graph shown here. Does the car ever go backward? Explain. Yes, the car moves backward when the graph slopes downward and the position decreases. No, the car always moves forward because the position is always positive. There is not enough information to determine the direction of the car's movement. Is the instantaneous velocity at point A greater or less than that at point B? Explain. The instantaneous velocity at point A is greater than at point B because the slope at point A is steeper than the slope at point B. The instantaneous velocity at point A is less than at point B because the car travels for a longer time interval at the velocity of point B. O There is not enough information to determine the instantaneous velocities at points A and B. A car moves along a straight section of road so that its velocity varies with time as shown in the graph. Does the car ever go backward? Explain. Yes, the car is moving backwards at point A where the slope is the steepest. Yes, the car is moving backwards at point B where the line segment is horizontal. Yes, the car is moving backwards at point C when the slope is negative. No, the car has a positive velocity during the entire time shown. At which of the labeled points on the graph, A, B, or C, is the magnitude of the acceleration the greatest? Explain. O At point A, the acceleration is greatest since the slope is the greatest. At point B, the acceleration is the greatest because the velocity is the greatest. At point C, the acceleration is the greatest because the slope is negative. The acceleration is constant throughout the 6 seconds.Explanation / Answer
1) A. Yes, the car is traveling around the curve with constant speed. If the speed is not changing, then its
acceleration is equal to zero.
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