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An electron in a vacuum is first accelerated by a voltage of 21100 V and then enters a region in which there is a uniform magnetic field of 0.644 T at right angles to the direction of the electron’s motion. The mass of the electron is 9.11 × 10−31 kg and its charge is 1.60218 × 10−19 C. What is the magnitude of the force on the electron due to the magnetic field?Answer in units of N.
to help keep his barn warm on cold days a farmer stores 832 kg of solar-heated water lf 3.35e5 jkg in barrels. for how
A 61 kg speed skater with the velocity of 16 m/s comes into a curve of 18 m radius. How much friction should be exerted between skates and ice to negotiate the curve.
a typical wall outlet voltage is 120 volts in the united states. personal mp3 players require much smaller voltages
The speed of a 1kg object is 2.0m/s (+/-) .05m/s, meaning its absolute uncertainty is .5m/s, calculate the absolute uncertainty in the kinetic energy
A child whose weight is 270 N slidesdown a 6.2 m playground slide that makesan angle of 20° with the horizontal. If she starts at the top with a speed of 4.97 m/s, what is her speed at the bottom
A disk rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity decreases to 10 rad/s. How many radians does the disk turn through during the 5.0-s interval
consider a horizontal parallel plate capactor where the size of the plates is much larger than the spacing between the
Unpolarized light passes through two polarizers in turn with polarization axes at 33° to one another. What is the fraction of the incident light intensity that is transmitted
question a 1.0-kg copper rod rests on 2 horizontal rails 1.0 m apart and carries a current of 50 a from 1 rail to the
An electron close to a large, flat sheet of charge is repelled from the sheet with a 2.2pN force. Find the surface charge density on the sheet
You're a marine biologist concerned with the effects of sonic booms on plankton, and you need to estimate the altitude of a supersonic aircraft flying directly over you at 1.1 times the speed of sound
a 30.0-kg packing case is initially at rest on the floor of a 1500-kg pickup truck. the coefficient of static friction
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