A 0.50 kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the highest point of the circle the speed of the mass is 8.0 m/s. What is the magnitude of the force of the string on the mass at this position?
a. 21 N
b. 11 N
c. 16 N
d. 26 N
e. 36 N
B
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Graphical Analysis: The graph in the figure shows the position of a particle as it travels along the x-axis. What is the magnitude of the average velocity of the particle between t = 1.0 s and t = 4.0 s?
A. 0.25 m/s B. 0.50 m/s C. 0.67 m/s D. 1.0 m/s E. 1.3 m/s
An X-ray telescope placed on the surface of Earth can detect X-rays that are emitted from a distant astrophysical source.
Answer the following statement true (T) or false (F)
Mercury experiences extreme high and low temperatures between night and day because:
A) it is so close to the Sun. B) its dense atmosphere creates a runaway greenhouse. C) its oceans are much hotter than ours. D) Mercury has no axial tilt, with its equator always exposed to direct sunlight. E) it has no true atmosphere to moderate temperatures over the globe.
Monochromatic light (? = 500 nm) is incident on a soap bubble (n = 1.40). How thick is the bubble (in nm) if destructive interference occurs in the reflected light?
a. 102 b. 179 c. 54 d. 1 e. 89