Time Dilation: How fast (in terms of the speed of light) should a moving clock travel if it is to be observed by a stationary observer as running at one-half its normal rate?
Fill in the blank(s) with the appropriate word(s).
0.866c
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A mass m = 2.0 kg is attached to a spring having a force constant k = 290 N/m as in the figure. The mass is displaced from its equilibrium position and released. Its frequency of oscillation (in Hz) is approximately
?
?
A. 12. B. 0.50. C. 0.010. D. 1.9. E. 0.080.
A policeman investigating an accident measures the skid marks left by a car on the horizontal road
He determines that the distance between the point that the driver slammed on the brakes (thereby locking the wheels) and the point where the car came to a stop was 28.0 m. From a reference manual he determines that the coefficient of kinetic friction between the tires and the road under the prevailing conditions was 0.300. How fast was the car going when the driver applied the brakes? A) 12.8 m/s B) 45.7 m/s C) 21.4 m/s D) 10.7 m/s E) 32.9 m/s
An 8.0-kg object rests on the floor of an elevator which is accelerating downward at a rate of 1.3 m/s2 . What is the magnitude of the force the object exerts on the floor of the elevator?
a. 59 N b. 10 N c. 89 N d. 68 N e. 78 N
A camera lens that acts like a telescope to magnify images is referred to as a
A) normal lens. B) telephoto lens. C) wide-angle lens. D) zoom lens. E) digital lens.