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A spherical water drop, 1.20 ?m in diameter, is suspended in calm air owing to a downward-directed atmospheric electric field E = 432 N/C.
What is the weight of the drop?
How many excess electrons does the drop have?
Find the strength of the magnetic field that causes a torque of 2.09 × 10-5 N·m to act on the loop when a current of 0.00361 A flows in it
A ball with v0 = 15 m/s collides with two identical balls which are lined up vertically as in the diagram below. Find the velocities of all three balls after the collision
An archer puts a 0.54 kg arrow to the bowstring. An average force of 202 N is exerted to draw the string back 1.3 m. suppose that air resistance is negligible.
Some birthmarks can be removed by exposure to 585 nm laser light. Pulses are strongly absorbed by hemoglobin in the capillaries in the birthmark, What is the power of the laser pulse
a steel cylinder of mass 0.325 kg is tied to a string and allowed to revolve in a circle of radius 1.15 m on a
The wire is located in a uniform magnetic field B directed perpendicular to the wire. Compute the magnitude of B when the force on the wire due to B is 0.200 N.
An ideal gas, at initial temperature T1 and initial volume 2.0 m3, is expanded adiabatically to a volume of 4.0 m3 then expanded isothermally to a volume of 10 m3, and then compressed adiabatically back to T1.
1. a spring with negligible mass stretches 34.0 cm when a 144 g gram mass is suspended from it. now i suspend a mass m
A cylinder is fitted with a piston that is connected to the bottom by a spring. Find the work done by pressure in compressing the spring
In a ballistic pendulum experiment a 20 g bullet is shot into a 2.3 kg block of wood suspended by a cord of negligible mass. what is the approximate muzzle speed (in m/s) for the gun that fired the bullet
A kicker punts a football from the very center of the field to the sideline 36 yards downfield. What is the direction of the net displacement of the ball
A boy holds a 40-N weight at arm's length for 10 s. His arm is 1.5m ablove the ground. The work done by the force of the boy on the weight is
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