Three forces, 14.0 N, 25.0 N, and 20.0 N, are acting on a 9.6-kg object. Which of the following forces could also be acting on the object if it is moving with constant velocity?
a. 1.0 N
b. 17 N
c. 30 N
d. 5.0 N
e. any of the above
e
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Why can't astronomers use the 21-cm line of neutral hydrogen gas to measure the masses of elliptical galaxies?
A) All elliptical galaxies are too far away for us to detect the 21-cm line. B) The disorderly motion of the material in elliptical galaxies prevents us from measuring different velocities at different sides of the galaxy. C) Elliptical galaxies have little gas, so they do not have strong 21-cm line emission. D) Supermassive black holes in the center of elliptical galaxies disturb measurements of the 21cm line.
Earth possesses few visible craters and the Moon possesses many. This is because
a. Earth formed later than the Moon and, therefore hasn't encountered as many meteoroids. b. the Moon doesn't have an atmosphere that could burn up many of the meteorites before impacting. c. erosion and plate tectonics have slowly removed evidence of past cratering on Earth. d. Earth formed later than the Moon and, therefore hasn't encountered as many meteoroids; the Moon doesn't have an atmosphere that could burn up many of the meteorites before impacting; and erosion and plate tectonics have slowly removed evidence of past cratering on Earth. e. the Moon doesn't have an atmosphere that could burn up many of the meteorites before impacting and erosion and plate tectonics have slowly removed evidence of past cratering on Earth.
At what frequency will the capacitive reactance of a 0.010-?F capacitor be 100 ??
A) 0.31 MHz B) 0.16 MHz C) 1.0 kHz D) 16 kHz
Determine the heat capacity (in calories/°C) of a lake containing one million gallons (approximately 4 million kilograms) of water at 15°C
a. 4 × 10^6 b. 4 × 10^9 c. 4 × 10^3 d. 1 × 10^3 e. 4 × 10^2