A tow truck exerts a force of 3000 N on a car, which then accelerates at 2 m/s2. What is the mass of the car?
A) 500 kg
B) 1000 kg
C) 1500 kg
D) 3000 kg
E) none of these
Answer: C
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Free Fall: To determine the height of a flagpole, Abby throws a ball straight up and times it. She sees that the ball goes by the top of the pole after 0.50 s and then reaches the top of the pole again after a total elapsed time of 4.1 s. How high is the pole above the point where the ball was launched? Neglect air resistance.
A. 10 m B. 13 m C. 16 m D. 18 m E. 26 m
A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 20.0 radians per seconds, then the period of the rotational motion is
A. 0.143 s. B. 0.224 s. C. 0.314 s. D. 0.421 s. E. 0.558 s.
To accelerate your car at a constant acceleration, the car's engine must
A) maintain a constant power output. B) develop ever-decreasing power. C) develop ever-increasing power. D) maintain a constant turning speed.
The bright photosphere is much hotter than the faint corona
Indicate whether the statement is true or false