A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with a speed V?
a. QVB toward the east
b. Zero
c. QVB toward the west
d. QVB upward
e. QVB toward the south
c
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What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
A) gravitational force and outward pressure B) gravitational force and surface tension C) the strong force and the electromagnetic force D) the strong force and the weak force
Significant Figures: What is the result, expressed to the proper number of significant figures, of adding 23.4 to 91.237 and then subtracting 23.4?
A. 91.237 B. 91.2 C. 91.3 D. 91.0 E. 91
Most of Earth's freshwater supply is now in the
form of a) oceans. b) rivers and lakes. c) groundwater. d) glacial ice.
An object moving in simple harmonic motion has an amplitude of 0.0450 m and a maximum acceleration of 40.0 m/s2 . What is the frequency of the system?
a. 14.9 Hz b. 187 Hz c. 4.75 Hz d. 11.9 Hz e. 1.80 Hz