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Crossed magnetic and electric fields are established over a certain region. The magnetic field is 0.40 T vertically downward. The electric field is 7.0 x 106 V/m horizontally east. An electron, traveling horizontally northward, experiences zero net force from these fields and so continues moving in a straight line. Find what is the electron speed?
m/s
Two negative charges, Q = -30 \mu C are placed on the x-axis at x = +0.25 m and x = -0.25 m. How much energy does it take to assemble these two charges
a 70.9 kg boy and a 43.2 kg girl both wearing skates face each other at rest on a skating rink the boy pushes the girl
A solid cylinder with a radius of 4.0 {rm cm} has the same mass as a solid sphere of radius R. If the cylinder and sphere have the same moment of inertia about their centers, illustrate what is the sphere's radius?
a 80 kg student consumes 2500 cal each day and stays the same weight. one day he eats 3500 cal and wanting to keep from
Illustrate what is the average force exerted on the ball by the bat? Neglect the weight of the bat, since it is so much less than the force of the bat. Choose the direction of the incoming ball as the positive direction.
A dragster starts from rest and accelerates down a track. Every tire has a radius of 0.320 meter and rolls without slipping. At a distance of 351 meter, Calculate the linear speed of the dragster
The efficiency of a Carnot engine is 27%. The engine absorbs 795 J of heat per cycle from a hot reservoir at 499 K. Determine the heat expelled per cycle and the temperature of the cold reservoir.
a block with a mass of 2.50kg is resting on a ramp. find the max static friction force that acts on the block.
three liquids are at temperatures of 10 degrees c 20 degree c and 30 degrees c respectively. equal masses of the first
A hollow, thin-walled cylinder and a solid sphere start from rest and roll without slipping down an inclined plane of length4.0 m. The cylinder arrives at the bottom of the plane 2.4 s after the sphere. Decide the angle among the inclined plane and t..
An 800 g ball moves in a vertical circle on a 1.07-m-long string. If the speed at the top is 5-m/s, after that the speed at the bottom would be 8.18 m/s.
A coil of inductance 81 mH and unknown resistance and a 0.84 µF capacitor are connected in series with an alternating emf of frequency 875 Hz. what is the resistance of the coil
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