If the force on an object is in the negative direction, the work it does on the object must be
A) negative.
B) positive.
C) The work could be either positive or negative, depending on the direction the object moves.
C
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Find the orbital speed of an ice cube in the rings of Saturn
The mass of Saturn is 5.68 × 1026 kg and the rings have an average radius of 100,000 km. (G = 6.67 × 10-11 N ? m2/kg2) A) 27.5 km/s B) 13.8 km/s C) 1.95 km/s D) 19.5 km/s
Air moves away from a high-pressure region where it
A) sinks. B) rises. C) cools. D) stops.
Ohm's Law: The current through a piece of lab equipment must be limited to 2.75 A when it is run by a 120-V dc power supply. What must be the resistance of this equipment?
Fill in the blank(s) with the appropriate word(s).
A 35.0-N crate is pulled up a 4.0-m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 25.0 N between the crate and the surface, what is the force applied by the worker?
a. zero b. 3.95 N c. 21.1 N d. 46.1 N e. 84.2 N