Motor 1 does 30 J of work in 10 s, motor 2 does 2 J of work in 5 s, motor 3 does 7 J of work in 2 s, and motor 4 does 7 J of work in 3 s. List the motors in order of highest power produced to lowest power produced
a. 2, 4, 1, 3
c. 1, 3, 4, 2
b. 3, 4, 1, 2
d. 3, 1, 4, 2
D
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Equilibrium: A tightrope walker walks across a 30-m long wire tied between two poles. The center of the wire is displaced vertically downward by 1.0 m when he is halfway across. If the tension in both halves of the wire at this point is 6294 N, what is the mass of the tightrope walker? Neglect the mass of the wire.
A. 85 kg B. 43 kg C. 74 kg D. 91 kg
Answer the following statement(s) true (T) or false (F)
1. A linear traveling wave can be partially reflected when it encounters another linear traveling wave. 2. The reflection will be total
What is the net power needed to change the speed of a 1600-kg sport utility vehicle from 15.0 m/s to 40.0 m/s in 4.00 seconds?
A) 100 kW B) 10.0 kW C) 140 kW D) 14.0 kW E) 275 kW
Doubling the wavelength of a photon would ______________
a. reduce its energy to one-half b. double its energy c. triple its energy d. not change