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A proton is traveling to the right at 3.5 x 107 m/s. Find what uniform electric field (magnitude and direction) is needed to cause it to travel to the left at the same speed after one second?
assume that the area of contact between an automobile tire and the road is a rectangle with dimensions 17.5 cm cross
A spacecraft moving away from Earth emits a 4748 Hz signal. A scientist on Earth measures thesignal to be 4747 Hz. What is the speed of the spacecraft relative to Earth
The velocity of a 2.50 kg block sliding down a frictionless inclined plane is found to be 1.48 m/s.2.00 s later; it has a velocity of 8.68 m/s. What is the angle of the plane with respect to the horizontal?
A current of 7.93 A in a solenoid of length 14.2 cm creates a 0.327-T magnetic field at the center of the solenoid. How many turns does this solenoid contain
question a boy of mass 50.5 kg is initially on a skateboard of mass 2.00 kg moving at a speed of 10.3 ms. the boy falls
A large tree trunk is floating in the sea. The density of the sea water is 1040 kg/m3, What fraction of the trunk's volume is above the surface of the water
A cable is lifting a construction worker and a crate, asthe drawing shows. The weights of the worker and crate are915 and 1500 N, respectively. What is the tension in the cable below the worker
A 5.15-g bullet is moving horizontally with a velocity of +359 m/s, where the sign + indicates that it is moving to the right (see part a of the drawing). What is the velocity of the second block after the bullet imbeds itself
At high noon, the Sun delivers 1.10-kW to each square meter of a blacktop road. If the hot asphalt loses energy only by radiation, what is its equilibrium temperature?
A transformer is to be used to provide power for a computer disk drive that needs 5.8 V (rms) instead of the 120 V (rms) from the wall outlet. determine the current in the primary
Suppose you were to disconnnect the battery (without losing any of the charge on the plates) and then remove the dielectric medium. What would be the new voltage across the plates
a box rests on a frozen pond which serves as a frictionless horizontal surface. if a fisherman applies a horizontal
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