A speed boat requires 85.0 kW to move at a constant speed of 14.0 m/s. What is the resistive force of the water at this speed?
a. 1 190 N
b. 6 070 N
c. 6 170 N
d. 5 970 N
e. 1 290 N
b
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Indicate whether the statement is true or false
Angular and Linear Quantities: A rolling wheel of diameter of 68 cm slows down uniformly from 8.4 m/s to rest over a distance of 115 m. What is the magnitude of its angular acceleration if there was no slipping?
A. 1.8 rad/s2 B. 0.90 rad/s2 C. 5.7 rad/s2 D. 11 rad/s2
During a thunderstorm, an observer notes that 10 s elapsed between the lightning flash and the sound of the thunder. What is the approximate distance, in miles, from the observer to the lightning?
a. 10 mi b. 50 mi c. 2 mi d. 100 mi
As measured from the Earth, a spacecraft is moving at speed 0.80c when it releases a probe at speed 0.60c relative to the spacecraft in a forward direction. What would be the speed of the probe as measured from the Earth?
a. 0.70c c. c b. 0.81c d. 0.95c