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An electron is moving at a constant speed of 15 m/s on a circle of radius 2.2 m.
Express the circumference of the circle C in terms of its radius R.
Express the time interval Δt for the electron to finish one circle in terms of the circumference C and speed v.
Express the current I on the circle through the charge e and time interval Δt.
Calculate the numerical value of I in A.
A heat engine performs 192 J of work in each cycle and has anefficiency of 41%. For each cycle of operation, how much energy is absorbed byheat? Answer in units of J.
In a head-on collision, a car stops in 0.30{\rm s} from a speed of 30{\rm m}/{\rm s}. What force is applied to the driver by his seat belt during that fraction of a second
The drawing shows three materials, a, b, and c. A ray of light strikes the a–b interface at an angle that now hardly exceeds its critical angle of 40.0°. The reflected ray then strikes the a–c interface at an angle of incidence that now barely exceed..
The color index of another bright star in our summer sky, Antares, is B-V=1.67. Is Spica hotter or cooler than Antares? Explain your answer (you should include some discussion of the properties of blackbody radiators in your answer).
A CD (radius 6.0 cm) is spinning freely with an angular velocity of490rpm when a bug drops onto the CD a distance4.4cm from the center. find the ratio of the bug's mass to the mass of the CD
a long narrow steel rod of length 2.5000 m at 25 c is oscillating as a pendulum about a horizontal axis through one
Each cycle, a certain heat engine expels 265 J of heat when you put in 355 J of heat. Find the efficiency of this engine. Find the amount of work you get out of the 355 J heat input.
Trained dolphins are capable of a vertical leap of 7.0m straight up from the surface of the water-an impressive feat. What maximum horizontal range could the dolphin achieve
The pressure in a gas thermometer is 4880 Pa at the freezing point of water. Find the pressure in this thermometer at the boiling point of water
Two forces act on a 6.00-kg object. One of the forces is 10.0 N.If the object accelerates at 2.00 m/s2, what is the greatest possible magnitude of the other force?
Consider a simple spherical wave, with omega/k=c
Which of the following response(s) will lead to a null vector (?F=0)? Adding a force 2 blocks up and another force ?13 blocks at 33.7° up and to the left. Adding a force 2?2 blocks at 45° to the left and down and another force ?2 blocks at 45° to the..
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