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An object carries a charge of -8.9 µC, while another carries a charge of -2.0 µC. How many electrons must be transferred from the first to the second object so that both objects have the same charge?
A spacecraft with a proper length of 250 m passes by an observer on the Earth. According to this observer, it takes 0.780 µs for the spacecraft to pass a fixed point. Determine the speed of the spacecraft as measured by the Earth-based observer. c
A charge of +Q is located at the 0 mark of a meter stick whilea charge of +3Q is located at the 100 cm mark. Where is the net field equal to zero
the braking distance of a car is 31m. if the speed of the car is increased by 40 what is the cars new braking distance?
One lens of a nearsighted person's eyeglasses has a focal length of -21.7 cm, and the lens is 1.70 cm from the eye. what should be the focal length of the corresponding contact lens
A 130 g copper bowl contains 240 g of water, both at 20.0°C. How much energy (in calories) is transferred to the water as heat
a cross-sectional area of wire so as to produce a steady current of 5.00 mA, How many electrons passed this cross-sectional area in that amount of time
Ultrasonic acoustic waves are diffracted by a pair of parallel slits 100mm apart. The zeros in the diffraction pattern are spaced at angular intervals of 8.3 degrees. Calculate the wavelength.
A gas expands, changing its volume by +4.24×10-4 m3 while at a constant pressure of 6.44×105 Pa. What is the work done by the surroundings on the gas
An electric heater carries a current of 16.5 A when operating at a voltage of 1.50 102 V. What is the resistance of the heater
The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net, With what minimum average speed must he move
An ideal monatomic gas expands isothermally from 0.590 m3 to 1.25 m3 at a constant temperature of 690 K. If the initial pressure is 1.10 105 Pa. Find the change in the internal energy
A standing wave is produced on a clothesline 8m long when five birds sit on the line. No birds sit on the end. What is the wave speed
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