Mars has a mass that is 1/10th the mass of the Earth and a radius that is 1/2 the radiusof Earth. Compare the force of gravity on Mar's surface to that on the surface of Earthusing the proportional relationship F is proportional toM/R2
a) Gravity on Mars is 10 times stronger than on Earth.
b) Gravity on Mars is 1/10th as strong as on Earth.
c) Gravity on Mars is 4/10ths as strong as on Earth.
d) Gravity on Mars is 4 times stronger than on Earth.
e) Gravity on Mars is equal to gravity on Earth.
Ans: c) Gravity on Mars is 4/10ths as strong as on Earth.
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Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
A. Y has a negative charge. B. Z has a negative charge. C. Y has a positive charge. D. Z is neutral (has no net charge). E. Y is negatively charged or neutral (has no net charge).
Answer the following statement(s) true (T) or false (F)
1. The rod creates a magnetic field in that frame. 2. The proton feels an electric force in that frame. 3. The proton feels a magnetic force in that frame 4. Imagine a situation where in one inertial reference frame there is a uniform electric field but no magnetic field. It is possible to find another inertial reference frame where there is a magnetic field but no electric field. 5. If the electric and magnetic fields are both zero in any given frame, they are zero in all frames.
A positive point charge q is placed off center inside an uncharged metal sphere insulated from the ground as shown. Where is the induced charge density greatest in magnitude and what is its sign?
?
?
A. A; negative B. A; positive C. B; negative D. B; positive E. C; negative
The rear window in a car is approximately a rectangle, 2.1 m wide and 0.45 m high. The inside rearview mirror is 0.55 m from the driver's eyes, and 1.70 m from the rear window.
a) What is the minimum length for the rearview mirror if the driver is to be able to see the entire width and height of the rear window in the mirror without moving her head? b) What is the minimum height for the rearview mirror if the driver is to be able to see the entire width and height of the rear window in the mirror without moving her head?