You are driving at on a freeway curve of radius What is the magnitude of your acceleration?
A) 36.0 m/s2
B) 1.20 m/s2
C) 20.8 m/s2
D) 0.833 m/s2
A
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Why does the Moon show phases in the course of a month?
Clouds get in the way of the Moon's light and cover up parts of it. The Moon glows from the inside and its various continents glow different amounts. The angle the Moon makes with the Sun changes and we see differing amounts of reflected sunlight. The Earth's shadow falls on the Moon to different degrees as the Moon goes around.
A crane lifts a steel submarine (density = 7.8 × 103 kg/m3 ) of mass 20,000 kg. What is the tension in the lifting cable:
(a) when the submarine is submerged? (b) when it is entirely out of the water?
A charge of 5.0 pC is distributed uniformly on a spherical surface (radius = 2.0 cm), and a second charge of ?2.0 pC is distributed uniformly on a concentric spherical surface (radius = 4.0 cm). Determine the magnitude of the electric field 3.0 cm from the center of the two surfaces.
A. 30 N/C B. 50 N/C C. 40 N/C D. 20 N/C E. 70 N/C
Assume everyone in the United States consumes one soft drink in an aluminum can every two days. If there are 270 million Americans, about how many tons of aluminum need to be recycled each year if each can weighs 1/15 pound and one ton = 2 000 pounds?
a. 450 000 tons b. 1.6 million tons c. 3.3 million tons d. 0.82 million tons e. 410 000 tons