A 3.0-kg mass sliding on a frictionless surface has a velocity of 5.0 m/s east when it undergoes a one-dimensional inelastic collision with a 2.0-kg mass that has an initial velocity of 2.0 m/s west. After the collision the 3.0-kg mass has a velocity of 1.0 m/s east. How much kinetic energy does the two-mass system lose during the collision?
a. 22 J
b. 24 J
c. 26 J
d. 20 J
e. 28 J
b
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In principle, if we could see all the way to the cosmological horizon we could see the Big Bang taking place. However, our view is blocked for times prior to about 380,000 years after the Big Bang. Why?
A) Before that time, the universe was too crowded with stars. B) Before that time, the gas in the universe was dense and ionized and therefore did not allow light to travel freely. C) Before that time, the universe was dark so there was no light to illuminate anything. D) 380,000 years after the Big Bang marks the time when stars were first born, and thus began to shine the light by which we can see the universe.
The most important force in the hydrogen atom is
a. the nuclear force. b. the gravitational force. c. the electromagnetic force. d. none of these.
Rain that freezes on striking a cold surface gives rise to a(n) ______________ storm
a. hail b. rain c. ice d. snow
A hair dryer draws 1500 W, a curling iron draws 800 W, and an electric light fixture draws 500 W. If all three of these appliances are operating in parallel on a 120 V circuit, what is the total current drawn?
a. 23.3 A c. 36.7 A b. 20.8 A d. 19.4 A