Ocean tides are waves that have a period of 12 hours, an amplitude (in some places) of 1.50 m, and a speed of 750 km/hr. What is the distance between adjacent crests of these waves?
A) 9000 km
B) 32,400 km
C) 9000 m
D) 32,400 m
E) 2500 m
Answer: A
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Briefly explain why high-mass stars have shorter lifetimes than low-mass stars
What will be an ideal response?
If your mass doubles, your weight
A) also doubles. B) is quadrupled. C) remains the same.
A transformer with 120. turns in its secondary supplies 12. volts at 220. ma to a toy train. The primary is connected across a 120. V wall outlet
(a) How many turns are in the primary? (b) What is the primary current? (c) What power is delivered by the wall outlet?
Rotational Dynamics: The drum shown in the figure has a radius of 0.40 m and a moment of inertia of 2.3 kg ? m2 about an axis perpendicular to it through its center. The frictional torque at the drum axle is 3.0 N ? m. A 14-m length of rope is wound around the rim. The drum is initially at rest. A constant force is applied to the free end of the rope until the rope is completely unwound and slips off. At that instant, the angular speed of the drum is 23 rad/s. The drum then slows down at a constant rate and comes to a halt. In this situation, what was the magnitude of the constant force applied to the rope?
A. 51 N B. 40 N C. 29 N D. 18 N E. 7.5 N