Your mass is 50 kg. Suppose you are standing on a scale in an elevator that is approaching a top floor and decreasing its speed at the rate of 3 m/s every second. What would be the reading on the scale?
A. 0 N
B. 150 N
C. 740 N
D. 640 N
E. 340 N
Answer: E
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A recent sunspot maximum occurred in 2001 . What is the year of the sunspot maximum that immediately follows the 2001 maximum if the solar cycle continues?
a. 2006 or 2007 b. 2012 c. 2018 d. 2023 e. the last cycle started a Maunder minimum and the next maximum cannot be predicted.
AC Generator: 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. 4?0 B. 2?0 C. ?0 D. ?0/2 E. ?0/4
What is the initial direction of the magnetic force acting on the particle in each case?
A. Forward
B. Backward
C. Rightward
D. Leftward
E. Into the paper
F. Out of the paper
T. (Zero force)
The energy gap for germanium is 0.670 eV at room temperature. What wavelength must a photon have (in nm) to excite the electron to the conduction band?
a. 640 b. 1 090 c. 1 850 d. 2 200 e. 925