Series/Parallel Circuits: What is the magnitude of the potential difference between points A and C for the circuit shown in the figure? The battery is ideal, and all the numbers are accurate to two significant figures.
A. 6.0 V
B. 4.0 V
C. 3.0 V
D. 2.0 V
Answer: A
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The numerical value of G, the gravitational constant, was determined
A. from knowledge of Earth's mass. B. from the law of universal gravitation and the value of the acceleration due to gravity. C. from the value of the Moon's acceleration. D. by measuring the force between masses in the laboratory.
When a car passes you with its horn blaring you hear a lower-frequency sound after the car has passed than when it is approaching. This is because:
A. The frequency of the sound wave produced changes B. Motion of the source changes the wavelength of the sound reaching you C. The air warms up due to motion of the car, causing the speed of sound to change
A hobby rocket reaches a height of 72.3 m and lands 111 m from the launch point with no air resistance. What was the angle of launch?
A) 69.0° B) 67.4° C) 22.6° D) 44.8°
As a car goes up a hill, there is a force of friction between the road and the tires rolling on the road. The maximum force of friction is equal to:
a. the weight of the car times the coefficient of kinetic friction. b. the normal force of the road times the coefficient of kinetic friction. c. the normal force of the road times the coefficient of static friction. d. zero.