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1. During what time period do free neutrons disappear? Explain.
2. Explain how it might be possible to confuse the redshifts from recession velocities with the gravitational redshifts. How can we distinguish the two?
3. Quasars are known to vary in brightness by just a few hours or days. What can we say about the size of these quasars?
If you run the wire between the poles of a strong horseshoe magnet, subjecting 5.00 cm of it to a 1.95 T field (perpendicular to the wire), what force is exerted on this segment of wire
dung beetles are renowned for building large relative to their body size balls of dung and rolling them on the ground.a
An object of mass 1.2kg is placed 0.1m from the axis of a rotating turntable of variable speed. Find the number of revolutions per minute at which the object just starts to slide off
When a converging lens is used in a camera (as in the first drawing), the film must be placed at a distance of 0.240 m from the lens to record an image of an object that is 3.80 m from the lens. How far from the projector lens should the film be pl..
A meter stick of mass 150 g is pivoted at its center. A mass m1 of 75.0 g is suspended 13.0 cm from the left end of the meter stick. How much mass m2 must be suspended 69.0 cm from the left end of the meter stick to achieve rotational equilibrium?
The weight of a 1200 - kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2
A current of 18.0 mA is maintained in a single circular loop of 2.20 m circumference. A magnetic field of 0.690 T is directed parallel to the plane of the loop. Calculate the magnetic moment of the loop.
You are designing a Carnot engine that has 2 mol of CO2 as its working substance; the gas may be treated as ideal. Find the temperature of the cold reservoir
A biophysics experiment uses a very sensitive magnetic field probe to determine the current associated with a nerve impulse traveling along an axon. what is the peak current carried by the axon
you are standing at the very rear of a raft of length l 6.4 m and mass m 132 kg that is at rest in a lake with its
A 300 DC power supply has fully charged a 15 mF capacitor. The charged capacitor is connected to a 20 mH inductor. find the magnetic energy in the inductor
A ladder 2.05 m long, weighing 229 N, initially lies flat on the ground. The ladder is raised to a vertical position. Compute the work done by the force lifting the ladder
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