How far away is a lightning bolt if it takes 20 s for the sound of the associated thunder to reach the observer?
a. 1 mile
c. 3 miles
b. 4 miles
d. 15 miles
B
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Spring tides and neap tides are caused solely by the effects of the Sun
Indicate whether the statement is true or false
When you stretch a rubber band, you are applying
A) compressional stress. B) tensional stress. C) shear stress. D) simple stress.
An ac generator consisting of a coil with N turns rotating at angular speed ? in an external magnetic field B produces a maximum emf ?0
If you now decrease the number of turns in the coil to N/2 and at the same time cause it to rotate twice as fast, what will be the new maximum emf if you do not change any of the other quantities? A) 2?0 B) ?0 C) 4?0 D) ?0/4 E) ?0/2
A 1.5-kg object has a velocity of 
m/s at t = 0. It is accelerated at a constant rate for five seconds after which it has a velocity of 
m/s. What is the magnitude of the resultant force acting on the object during this time interval?
A. 3.8 N B. 3.2 N C. 2.8 N D. 4.3 N E. 4.6 N