When a wave crosses from one medium into another in which the wave speed is lower, the frequency is unchanged. The wavelength
A. decreases.
B. stays the same.
C. increases.
Answer: A
Physics & Space Science
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On its own, a certain tow-truck has a maximum acceleration of 3.0 m/s2. What would be the maximum acceleration when this truck was towing a bus of twice its own mass?
A) 2.5 m/s2 B) 2.0 m/s2 C) 1.5 m/s2 D) 1.0 m/s2
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A 2.0-m wire carries a current of 15 A directed along the positive x axis in a region where the magnetic field is uniform and given by B = (30
? 40
) mT. What is the resulting magnetic force on the wire?
A.
(+1.2 
) N
) NB.
(?1.2 
) N
) NC.
(?1.5 
) N
) ND.
(+1.5 
) N
) NE.
(+0.90 
) N
) N
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At Mach 10, if all the energy of a meteorite went into heating the meteorite, its temperature would be about
A. 300C B. 6000C c. 30,000 c D. 100,000 C
Physics & Space Science