An object is thrown vertically and has an upward velocity of 18 m/s when it reaches one fourth of its maximum height above its launch point. What is the initial (launch) speed of the object?
a. 35 m/s
b. 25 m/s
c. 30 m/s
d. 21 m/s
e. 17 m/s
D
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While Ganymede and Callisto are about the same size, the surface of Callisto is much younger, with considerable tectonic reformation
Indicate whether the statement is true or false
Which of the following has the smallest albedo?
a. Water b. Polar ice c. Fresh snow d. Dry sand
The vibrations of a longitudinal wave move
A) along the direction of wave travel. B) at right angles to the direction of wave travel. C) that changes with speed.
"Time-of-day" pricing of electricity could help to
A) reduce the need for new power plants by encouraging users to use less electric energy. B) reduce the need for new power plants by encouraging users to use electric energy at less popular times. C) reduce the nation's appetite for chocolate fudge. D) reduce total electric energy use by encouraging users to use electric energy at less popular times. E) reduce total electric energy use by encouraging users to use less electric energy.