An object is moving along a straight line. The graph shows the object\'s positio

Question

An object is moving along a straight line. The graph shows the object's position from the starting point as a function of time. During which interval()s) is (are) the object moving in the negative x direction? AB only BC only DE only AB and CD BC and DE In which segment or segments of the graph does the object have the highest speed? AB BC CD De The speed of the object is constant A projectile follows a parabolic path. At the instant the projectile reaches the peak height, which of the following statements is true? Take the x axis to be horizo0ntal and the y axis to be vertical. V_ = 0 and a_ = 0 v_ = 0 and a_ = 0 v_ = 0 and a_ =0 v_ = 0 and a_ = 0 None are true Two point masses m and M are separated by a distance d. If the distance between the masses is increased to 3d, how does the gravitational f0orce between them change? The force will be one-third as great. The force will be one-ninth as great. The force will be three times as great. The force will be nine times as great. It is impossible to determine without knowing the numerical values m, m, and d. A cat goes around a circular road at a constant speed. Which one of the following statements concerning the directions of velocity and acceleration is true? Velocity and acceleration are the same direction Velocity is perpendicular to the acceleration Velocity and acceleration are in opposite directions (180 degrees apart) Not enough information to determine the directions

Explanation / Answer

3) The car travels in negative x-direction when the slope is negative. Answer is

c) DE only

4) The speed is the slope of the position vs time graph. Speed is highest in

d) DE

5) At the peak height

b) vy = 0 and ax = 0

6) Gravitational force is inversely proportional to the square of the distance of separation. When the distance is increased by 3 times

b) The force will be one-ninth as great

7) For the car moving in a circle

b) Velocity is perpendicular to the acceleration

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