Which of the following is not an energy unit?
A. N·m
B. calorie
C. Joule
D. kWh
E. Watt
Answer: E
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If the displacement of an object is given in SI units by Dx = -5t + t 2, at t = 2 s its velocity and acceleration are, respectively: (Hint: Use dimensional analysis along with the equations for motion with constant acceleration.)
a. positive, positive. c. negative, negative. b. positive, negative. d. negative, positive.
Briefly explain the importance of adaptive optics and interferometry
What will be an ideal response?
A particle (charge = +2.0 mC) moving in a region where only electric forces act on it has a kinetic energy of 5.0 J at point A. The particle subsequently passes through point B which has an electric potential of +1.5 kV relative to point A. Determine the kinetic energy of the particle as it moves through point B.
A. 3.0 J B. 2.0 J C. 5.0 J D. 8.0 J E. 10.0 J
The easiest way to remember which quarks make up a neutron is
A. Neutrons are all about u-three up quarks: uuu. B. The neutron is a real "dud"-a down quark, an up quark, and another down quark: dud. C. A neutron is an inside-out proton: uud. D. Roses are red, violets are blue, neutrons are nosy but do not have u: ddd.