The north celestial pole appears 30 degrees above your horizon. The star Vega is on your meridian. By studying your star charts and your clocks, you determine that Vega crossed the meridian in Greenwich (England) 3 hours ago. Where are you?
A) latitude 30°, longitude 45°W
B) latitude 30°N, longitude 3°W
C) latitude 60°N, longitude 45°W
D) It is not possible to determine your longitude from the information given.
A) latitude 30°, longitude 45°W
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A worker pushes a sled with a force of 40 N over a level distance of 6.0 m. If a frictional force of 16 N acts on the wheelbarrow in a direction opposite to that of the worker, what total work is done on the wheelbarrow?
a. 240 J c. 144 J b. 216 J d. 96 J
A toy steam engine has a mass of 1.00 kg. The toy starts from rest and reaches a velocity of 4.00 m/s in a time of 3.00 seconds while covering a distance of 4.50 meters. During that time the toy takes in 30 J of heat. What is the change in the internal energy of the toy?
A. -52.0 J B. +52.0 J C. -22 J D. +22 J
An ice skater doing a spin pulls in her arms, decreasing her moment of inertia by a factor of two. How does her angular speed changes?
A) It is reduced by a factor of two. B) It is reduced by a factor of four. C) It increases by a factor of two. D) It increases by a factor of four. E) It doesn't change.
Why is January a cold month in the northern United States?
A) Earth is near its farthest point from the sun. B) There's more snow in January. C) The northern hemisphere is farther from the sun than the southern hemisphere. D) The northern hemisphere is tilted away from the sun.