One practical application of matter waves is
A) the electron microscope.
B) photovoltaic cells.
C) lasers.
D) television.
E) X-rays.
A
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An object of mass m is held at a vertical height h from ground level. It is then released and falls under the influence of gravity. Which of the following statements is true in this situation? (Neglect air resistance.)
A) The total energy of the object is decreasing. B) The kinetic energy of the object is decreasing. C) The potential energy of the object is increasing. D) The total energy of the object is increasing. E) The potential energy of the object is decreasing and the kinetic energy is increasing.
The vector sum of three co-planar forces
A. must be zero. B. must be perpendicular to one of the three. C. must be parallel to one of the three. D. must be perpendicular to the plane. E. may have any direction in the plane.
A 7.0-? resistor is connected across the terminals of a battery having an internal emf of 10 V. If there is a 0.50-A current through the circuit, what is the internal resistance of the battery?
A) 13 ? B) 20 ? C) 10.8 ? D) 27.0 ?
Air with a density of 1.20 
flows through a 75.0 cm diameter pipe with a velocity of 2.00 m/s. What is the mass flow rate?
A. 0.95 kg/s B. 1.06 kg/s C. 1.20 kg/s D. 1.26 kg/s E. 1.48 kg/s