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In a thundercloud there may be electric charges of +37.0 C near the top of the cloud and -37.0 C near the bottom of the cloud. These charges are separated by 1.80 km. What is the electric force on the top charge?
Two bumper cars moving on a frictionless surface collide elastically. What is the speed of the first bumper car after the collision
q1. a diffraction grating with 395 linesmm is 1.00 m in front of a screen. what is the wavelength of light whose
In the final part of its life cycle a particular rotating spherical star expands to four times its normal diameter. How is the period of rotation affected
The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-5.30 107) t 2 + (3.15 105) t, What is the length of the barrel
Explain in your own words the meaning of acute and chronic exposure, deterministic and stochastic effects from radiation. Give examples
A 1060-kg van, stopped at a traffic light, is hit directly in the rear by a 794-kg car traveling with a velocity of +3.90 m/s. determine the final velocity of the car and the van
An airplane has a mass of 2.6 x10^6 kg, and the air flows past the lower surface of the wings at 95m/s. If the wings have a surface area of 1200m2, how fast should the air flow over the upper surface of the wing if the plane is to stay in the air?..
Two long, parallel wires separated by 3.00 cm carry currents in opposite directions. The current in one wire is 1.20 A, Is the force attractive or repulsive
A penny sits 20 cm from the axis on an old record, which is spinning at 45 rpm. find the coefficient of friction between the penny and the record
Charges of -11.5 nC and -22.1 nC are separated by 0.733 m. What is the potential midway between the two charges?
A pendulum of length 9.00 m is held out to point A. At the vertical position, an overhang effectively cuts the length of the pendulum by an amount equal to 3m. (That is, 3.0 m is no longer free to swing.) How long does this pendulum take for one o..
A 58-kg water skier is being pulled by a nylon tow rope that is attached to a boat. What is the change in the length of the rope when the skier has an acceleration whose magnitude is 0.90 m/s2
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