In the proton-proton cycle, the eventual product is
a. heavy hydrogen.
b. tritium.
c. helium-3.
d. helium-4.
d
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How far from a covnex lens of focal length 30 cm must an object be placed so the image will be virtual and 3.0 times as large as the object?
What will be an ideal response?
To find the equivalent resistance of the combination of resistors shown across the 28-V battery by the method of possibly repeated applications of combining resistors in series and /or combining resistors in parallel, the first step would be which of the following?
a.
Combine the two 10 ? in parallel since they can be done in your head.
b.
Combine, in series, the two 3-? resistors and the 4-? resistor in the right-hand branch of the circuit.
c.
Combine the seven resistors (two 5 ?, three 3 ?, one 2 ? and one 4 ?) in the outer loop of the circuit in series.
d.
This problem cannot be done by combining series and parallel resistors.
If a solid metal sphere and a hollow metal sphere of equal diameters are each given the same charge, the electric field ( ) midway between the sphere center and the surface is
A) greater for the solid sphere than for the hollow sphere. B) greater for the hollow sphere than for the solid sphere. C) zero for both. D) equal in magnitude for both, but one is opposite in direction from the other.
An automobile travels due north with a constant speed of 81 km/h. All forces considered, the unbalanced force acting on the auto is
a. zero. b. southward. c. northward. d. downward. e. upward.