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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X-rays from astronomical objects can only be detected from telescopes in space
Indicate whether the statement is true or false
An uncharged spherical conducting shell surrounds a charge -q at the center of the shell. The charges on the inner and outer surfaces of the shell are respectively
a. -q, -q. b. -q, +q. c. +q, -q. d. +q, +q. e. +q, 0.
Based on inventoried matter in the universe, including dark matter known to exist in galaxies and clusters, the actual density of the universe is what fraction of the critical density?
A) 1 percent B) 10 percent C) 26 percent D) 74 percent E) 100 percent
A miniature, spring-loaded, radio-controlled gun is mounted on an air puck. The gun's bullet has a mass of 6.00 g, and the gun and puck have a combined mass of 130 g. With the system initially at rest, the radio-controlled trigger releases the bullet, causing the puck and empty gun to move with a speed of 0.500 m/s. Of the total kinetic energy of the gun-puck-bullet system, what percentage is in
the bullet? a. 4% b. 98% c. 96% d. 23% e. 100%