Does atmospheric pressure affect the buoyant force on a rigid submarine? Explain why or why not
What will be an ideal response?
No. Adding a constant value to the pressure does not affect the net force. If the submarine were not rigid, a constant pressure would decrease the volume of the submarine, and thus decrease the buoyancy.
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A particle whose charge has the specified sign enters a region of space where the magnetic field has the direction shown. What is the initial direction of the magnetic force acting on the particle in each case?
A. Forward
B. Backward
C. Rightward
D. Leftward
E. Into the paper
F. Out of the paper
T. (Zero force)
A proton starting from rest travels through a potential of 1.0 kV and then moves into a uniform 0.040-T magnetic field. What is the radius of the proton's resulting orbit? (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C)
A) 0.080 m B) 0.11 m C) 0.14 m D) 0.17 m E) 0.19 m
The Sun's photosphere is, by mass, about 75%
a. helium. b. carbon. c. hydrogen. d. oxygen.
A planet has two identical moons with identical mass. Moon 1 is in a circular orbit of radius r. Moon 2 is in a circular orbit of radius 2r. The magnitude of the gravitational force exerted by the planet on Moon 2 is
1.four times as large as the gravitational force exerted by the planet on Moon 1. 2.twice as large as the gravitational force exerted by the planet on Moon 1. 3.the same as the gravitational force exerted by the planet on Moon 1. 4.half as large as the gravitational force exerted by the planet on Moon 1. 5.one-fourth as large as the gravitational force exerted by the planet on Moon 1.