A 90-gram wire that is 1.0 m long is under tension. When a transverse wave of frequency 890 Hz travels down the wire, its wavelength is 0.10 m and its amplitude is 6.5 mm. What is the tension in the wire?
A) 710 N
B) 820 N
C) 930 N
D) 1000 N
E) 1100 N
A
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The greater the temperature difference between input and output reservoirs of a heat engine, the
A) greater the efficiency. B) smaller the efficiency. C) both of the above D) none of the above
According to Lenz's law, the induced current in a circuit always flows to oppose the external magnetic field through the circuit
A) True B) False
When the distance between a pair of stars doubles, the force between them
A) decreases by one-quarter. B) decreases by one-half. C) increases to twice as much. D) increases to four times as much. E) stays the same.
At t = 0, a particle is located at x = 25 m and has a velocity of 15 m/s in the positive x direction. The acceleration of the particle varies with time as shown in the diagram. What is the velocity of the particle at t = 5.0 s?
?
?
a.
+15 m/s
b.
?15 m/s
c.
+30 m/s
d.
0
e.
?1.2 m/s