Answer the following statement(s) true (T) or false (F)
Consider an infinite solenoid with a rectangular cross section instead of a circular cross section.
1. The solenoid’s magnetic field must everywhere still point parallel to the solenoid’s central axis.
2. The solenoid’s magnetic field must still be zero everywhere outside the solenoid.
3. The solenoid’s magnetic field in the solenoid’s hollow interior must still have a uniform magnitude ? 0 (NI/L), where N is the number of turns in length L and I is the current carried by each turn
1. TRUE
2. TRUE
3. TRUE
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Which of the following statements is thought to be true of the jovian planets?
A) All have cores of about the same mass, but differ in the amount of surrounding hydrogen and helium. B) The major differences between the planets can be explained by the different masses of their cores. C) Jupiter and Saturn are made mostly of ammonia while Uranus and Neptune are mostly methane. D) Jupiter and Saturn are made mostly of hydrogen while Uranus and Neptune are mostly helium.
A basketball player pushes down with a force of 50 N on a basketball that is inflated to a gauge pressure of 8.0 × 104 Pa. What is the diameter of contact between the ball and the floor?
A) 2.8 cm B) 1.4 cm C) 1.7 cm D) 2.1 cm E) 5.6 cm
Liquid mercury is contained in a lead beaker as shown in Figure 1-14. Estimate the amount of mercury that migrates by diffusion into the beaker after 48 hours if the concentration of mercury is 2% at a distance 0.01 cm into the beaker wall from the inside surface. Assume that the system is at 20ºC and neglect evaporation to air.
A crate travels through a factory on a horizontal conveyor belt at a constant speed. If air resistance is negligible, what forces are active on the box?
A. Normal force, weight, static friction. B. Normal force, weight, force of the conveyor belt C. Normal force, weight, force of the conveyor belt, static friction D. Normal force and weight.