A 2500-N pile driver ram falls 10 m and drives a post 0.1 m into the ground. The average force on the post is
A) 2500 N.
B) 25,000 N.
C) 250,000 N.
D) 2,500,000 N.
Answer: C
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When a single slit that is 0.050 mm wide is illuminated by light of 550-nm wavelength, what is the angular separation between the first two minima on one side of the central maximum?
A) 0.36° B) 0.47° C) 0.54° D) 0.63° E) 1.3°
Atomic Nucleus: The primary reason that very large nuclei are unstable is due to
A. the cumulative repulsive force of the protons. B. the cumulative attractive force between the protons and the orbiting electrons. C. the repulsive force between the neutrons and the protons. D. the extreme weakness of the gravitational attraction of the protons.
Consider an RLC circuit. The impedance of the circuit increases if XL increases
A) always true B) never true C) true only if XL is greater than or equal to XC D) true only if XL is less than or equal to XC