Two boys in a canoe toss a baseball back and forth. What effect will this have on the canoe? Neglect (velocity-dependent) frictional forces with water or air
a. None, because the ball remains in the canoe. b. The canoe will drift in the direction of the boy who throws the ball harder each time. c. The canoe will drift in the direction of the boy who throws the ball with less force each time. d. The canoe will oscillate back and forth always moving opposite to the ball.
e. The canoe will oscillate in the direction of the ball because the canoe and ball exert forces in opposite directions upon the person throwing the ball.
D
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An automobile engine operates with an overall efficiency of 12%. How much energy is delivered as waste heat (in gallons of gasoline) for each 10 gallons of fuel burned?
a. 1.2 b. 8.8 c. 6.5 d. 4.7 e. 7.5
A rectangular loop of wire measures 1.0 m by 1.0 cm. If a 7.0-A current flows through the wire, what is the magnitude of the magnetic force on the centermost 1.0-cm segment of the 1.0-m side of the loop? (?0 = 4? × 10-7 T ? m/
A) A) 9.8 × 10-6 N B) 7.8 × 10-7 N C) 9.8 × 10-8 N D) 4.9 × 10-6 N
Studies of a star's position made on the same calendar date over subsequent years yield ________
Fill in the blank(s) with correct word
A cork floats in an inverted jar sitting on a cart, as shown in the left diagram below. If we suddenly accelerate the cart to the right (as shown in the right diagram) what will the cork do:
A. Lean backward B. Remain vertically floating directly above the base C. Lean forward D. Sink E. Explode