Meteor shower debris is believed to come from:
A) the asteroid belt when Mars deflects it toward us annually.
B) the core of a differentiated type M asteroid, now broken up.
C) the crust of a differentiated type C asteroid, now broken up.
D) the disintegration of a short period comet over many returns to the Sun.
E) deep space, far beyond the solar system, deflected by the gravity of another star.
D
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A solitary boy cannot balance on a seesaw with its fulcrum at its midpoint. If the fulcrum is moved to one-quarter the distance from the boy, balance is achieved when the weight of the boy is
A) less than the weight of the seesaw. B) equal to the weight of the seesaw. C) more than the weight of the seesaw. D) need more information
A particle (q = 3.0 mC, m = 20 g) has a speed of 20 m/s when it enters a region where the electric field has a constant magnitude of 80 N/C and a direction which is the same as the velocity of the particle. What is the speed of the particle 3.0 s after it enters this region?
a. 68 m/s b. 44 m/s c. 56 m/s d. 80 m/s e. 36 m/s
If cooking is done using an aluminum pan over an electric burner, which of the following will not promote the rate of heat flow from burner to food?
a. increase pan bottom thickness c. increase burner temperature b. increase pan bottom area d. decrease height of pan sides
About how many 100W light bulbs would you have to light up to use energy at the rate of one horsepower?
a. one or two b. seven or eight c. the question doesn't make sense—hp and W are unrelated d. dozens e. none of the above