What holds a circularly-moving satellite in orbit while the force of gravity pulls downward on it?
What will be an ideal response?
Answer: Nothing holds the satellite in orbit. It remains in orbit because the force of gravity pulls perpendicular to its motion, just as the speed of a bowling ball on a lane isn't changed by gravity. With no component of force in the direction of motion, no change in speed occurs. Only a change in direction occurs. The satellite has enough tangential speed to simply match Earth's curvature below.
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A radio telescope and an optical telescope of the same size have the same angular resolution
Indicate whether the statement is true or false
Impulse: Jennifer hits a stationary 0.20-kg ball, and it leaves her racket at 40 m/s. Time-lapse photography shows that the ball was in contact with the racket for 40 ms.(a) What average force did the ball exert on the racket?(b) What is the ratio of this force to the weight of the ball?
Fill in the blank(s) with the appropriate word(s).
The most underlying feature of machines is
A) energy conservation. B) that energy input always equals energy output. C) that power input always equals power output. D) all of the above E) none of the above
How much heat energy is required to vaporize a 4.40-g ice cube at 0°C? The heat of fusion of ice is 80.0 cal/g. The heat of vaporization of water is 540 cal/g, and cwater = 1.00 cal/g/°C
a. 2 730 cal b. 3 170 cal c. 2 820 cal d. 3 520 cal e. 2 380 cal