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The magnetic field of the earth at a certain location is directed vertically downward and has a magnitude of 50.0 µT. A proton is moving horizontally toward the west in this field with a speed of 6.90 x 106 m/s. Find the direction and magnitude of the magnetic force the field exerts on the proton?
A soccer ball is kicked from the ground with an initial speed of 20.1 m/s at an upward angle of 45.4?. What must be his average speed if he is to meet the ball just before it hits the ground
A typical coal-fired power plant burns 310 metric tons of coalevery hour to generate 780MW of electricity. 1metricton=1000kg. What is the power plant's thermal efficiency
A constant retarding torque of 15 m-N stops a "rolling" wheel of diameter 0.90 m in a distance of 20 m. How much work does the torque do
A tennis player swings her 1000g racket with a speed of 10m/s . She hits a 60g tennis ball that was approaching her at a speed of 21m/s. what is the average force that the racket exerts on the ball
suppose you wanted to be able to see small details on the moon using an optical telescope. what is the smallest
the back wall of a home aquarium is a mirror that is a distance of 46.0 cm away from the front wall. the walls of the
The frequencies of the spectral lines in light from a distant galaxy are found to be two-thirds as great as those of the same lines in light from nearby stars. Find the recession speed of the distant galaxy
A boats's motor can allow it to travel at speed 2V. The boat is aimed with a heading of 180 degrees. The river is X metes wide. The river flows at speed V at 270 degrees.
A 13.0-g wad of sticky clay is hurled horizontally at a 110-g wooden block initially at rest on a horizontal surface. The clay sticks to the block.what was the speed of the clay immediately before impact
Particles P and Q areinitially at rest 1.0 m apart. P has a mass of0.10 kg and Q a mass of 0.30kg. P and Q attract eachother with a constant force of 10–2 N. No external forces act on the system.
Compute the value that the spring constant should have so that passengers undergo an acceleration of no more than 7.0 when brought to rest. Let be the total mass of the elevator and passengers.
In an L-R-C series circuit, L = 0.398H , R = 310ohms , and C = 5.91×10?8F . When the ac source operates at the resonance frequency of the circuit, What is the voltage amplitude of the source
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