A 0.400-kg object is attached to a spring with spring constant k = 10.0 N/m and moves with simple harmonic motion over a horizontal frictionless surface. At the instant that it is displaced from equilibrium by ?0.0550 m, what is its acceleration?
a. 2 200 m/s2
b. ?220 m/s2
c. 0.220 m/s2
d. 1.38 m/s2
e. 0.550 m/s2
d
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Tom has a 4-inch refracting telescope, and Steve has a 3-inch reflecting telescope. Whose telescope has a higher resolving power?
A. Steve's, because mirrors are more efficient in showing the objects separately. B. Tom's, because lenses are more efficient in showing the objects separately. C. Steve's, because the smaller the diameter, the better the resolution. D. Tom's, because the larger the diameter, the better the resolution.
A buoy, used to mark a harbor channel, consists of a weighted rod 2.00 m in length. 1.50 m of the rod is immersed in water and 0.500 m extends above the surface
If sunlight is incident on the water with an angle of incidence of 40.0°, what is the length of the shadow of the buoy on the level bottom of the harbor?
Parallel-Plate Capacitor: The plates of a parallel-plate capacitor are maintained with constant potential by a battery as they are pulled apart. During this process, the amount of charge on the plates
A. must increase. B. must decrease. C. must remain constant. D. could either increase or decrease. There is no way to tell from the information given.
Liquid water cannot exist for very long on the surface of Mars today because
A) it gets rapidly destroyed by intense solar radiation B) its surface temperature is too high C) it rapidly reacts with the Martian surface to form peroxides D) its atmosphere is too thin