At a distance of 14,000 km from the center of Planet Z-99, the free-fall acceleration is 32 m/s2. What is the free-fall acceleration at a point 28,000 km from the center of this planet?
A) 8.0 m/s2
B) 16 m/s2
C) 128 m/s2
D) 4.0 m/s2
E) 2.0 m/s2
A
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Lonnie pitches a baseball of mass 0.15 kg. The ball arrives at home plate with a speed of 40 m/s and is batted straight back to Lonnie with a return speed of 60 m/s. If the bat is in contact with the ball for 0.050 s, what is the impulse experienced by the ball?
a. 360 N•s c. 400 N•s b. 20 N•s d. 15 N•s
To reduce the danger of self-induction
A) simply pull the circuit plug. B) turn off the switch to the circuit. C) either of these D) neither of these
A thick-walled metal pipe of length 20.0 cm has an inside diameter of 2.00 cm and an outside diameter of 2.40 cm. What is the total surface area of the pipe, counting the ends, in square centimeters?
A) 276 cm2 B) 277 cm2 C) 278 cm2 D) 279 cm2
To recharge a 12-V battery, a battery charger must move 3.6 × 10^5 C of charge from the negative to the positive terminal. What amount of work is done by the battery charger? How many kilowatt hours is this?