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Two people carry a heavy electric motor by placing it on a light board 2.30m long. One person lifts at one end with a force of 420N , and the other lifts the opposite end with a force of 650N .
Suppose the board is not light but weighs 180N , with its center of gravity at its center, and the two people each exert the same forces as before. What is the weight of the motor in this case?
Where is its center of gravity located?
Find out the critical angle theta_ce for e-waves in calcite. The index of refraction for light with electric field parallel to the optical axis (called extraordinary waves or e-waves) is 1.4864. The index of refraction for light with electric fiel..
A 2.00-m tall basketball player is standing on the floor 10.0 m from the basket. If he shoots the ball at a 30 degree angle from the horizontal, at what initial speed must he throw the ball so that it goes through the basket without striking the back..
A spinning object has a moment of inertia of 1.6 kg*m2. It is rotating at a rate of 1rad/s. If the moment of inertia increases to 3 kg*m2, what is the new rotational velocity
A swimmer runs horizontally off a diving board with a speed of 3.58 m/s and hits the water a horizontal distance of 1.79 m from the end of the board. How high above the water was diving board.
A jet plane passes over you at a height of 4990 m and a speed of Mach 1.75. Find the Mach cone angle
By what factor will the rms speed of gas molecules increase if the temperature is increased from 40 ?C to 150 ?C
Two particles are fixed along a straight line, separated by a distance 4.2 cm. The left one has a charge +3.0 nC and the right one has a charge of +7.0 nC. What is the location of the point
guess the force between a proton and an electron at the Bohr radius of 0.5Å (1 Å=10-10 m). The magnitude of the charge of an electron, as well as a proton, is 1.6·10-19 C.
A cord is used to vertically lower an initially stationary block of mass M = 40 kg at a constant downward acceleration of g/3. Find the work done by the cord's force on the block
Two 1.90-cm-diameter disks spaced 2.10mmapart form a parallel-plate capacitor. The electric field between the disks is 5.10×105V/m, What was the electron's speed as it left the negative plate
What is the beat frequency in Hz. A force of magnitude P pushes the block forward and downward as shown in the figure below. suppose the force is applied at an angle of 24.0° below the horizontal.
A 1350 kg car accelerates uniformly from 35.5 km/h to 75.5 km/h over 250 m. Determine the time taken for the car to accelerate
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