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The aurora is caused when electrons and protons, moving in the earth's magnetic field of , collide with molecules of the atmosphere and cause them to glow. What is the radius of the circular orbit f
If a material with a dielectric constant e=200 is inserted between the plates of the capacitor and it completely fills the area, what is the capacitance?
On a viewing screen, the light whose wavelength is known produces its sixth dark fringe at the same place where the light whose wavelength is unknown produces its fourth-order bright fringe. The fri
A 3.0 µF capacitor charged to 40 V and a 5.0 µF capacitor charged to 18 V are connected to each other. Find the potential difference across the capacitors.
Calculate the period and frequency of a 3.500 m long pendulum at the following locations:
A boy with a mass 50 kg walks up the stairs from the ground to the top of a spiral water slide in 1 minute. Find the mechanical energy lost by the boy in sliding down the slide.
What was the change in the potential energy (in Joules) of this charge?
A 0.05 kg arrow is launched vertically in the air. The bowstring exerts an average force of 53 N on the arrow over a distance of 0.75 m. How high will the arrow travel? Neglect air resistance.
Calculate the work done by a 5.0-{rm V} battery as it charges a 6.1-mu {rm{F}} capacitor in the flash unit of a camera.
Calculate the magnitude and direction of the force on a positive 5 mC charge at the midpoint between the two charges.
A dentist uses a small mirror of radius 52 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 13 mm from the tooth, what is the magnification of the resulting image?
A 2.35 kg mass is attached to a light cord that is wrapped around a pulley of radius 3.35 cm, which turns with negligible friction. The mass falls at a constant acceleration of 3.30 m/s2. Find the
A boy drags a wooden crate with a mass of 20 kg, a distance of 12 m, across a rough level floor at a constant speed of 1.5 m/s. What is the total amount of work done on the object?
An electron, initially at rest is accelerated through a potential difference of 450 V. What is the speed of the electron due to this potential difference?
A 200 kg object and a 500 kg object are separated by 4.0 m. Find the net gravitational force exerted by the 500kg object on a 50kg object placed midway between them.
A spring whose stiffness is 1020 N/m has a relaxed length of 0.46 m. If the length of the spring changes from 0.31 m to 0.87 m, what is the change in the potential energy of the spring?
Estimate the concentration of CO at 6pm if there was no CO in the air at 4pm. Assume that CO is conservative and that there is instantaneous and complete mixing in the box.
A parallel-plate capacitor has a plate area of 0.2 m^2 and a plate separation of 0.1 mm. If the charge on each plate has a magnitude of 4 × 10^-6 C the potential difference across the plates i
Determine the location of the center of mass of a "L" whose thin vertical and horizontal members have the same length L and the same mass M. Use the formal definition to find the x and y coordinates
A cannon tilted up at a 35.0 angle fires a cannon ball at 73.0 from atop a 14.0 -high fortress wall. What is the ball's impact speed on the ground below?
A person who weighs 670 N steps onto a spring scale in the bathroom, and the spring compresses by 0.79 cm. (a) what is the spring constant?
The index of refraction for violet light in silica flint glass is 1.66 and tha for red light is 1.62. What is the angular dispersion of visible light passing through an equilateral prism of apex an
A mass vibrates back and forth from the free end of an ideal spring of spring constant 20 N/m with an amplitude of 0.250 m. What is the kinetic energy of this vibrating mass?
If the combination has total resistance of 9.0 k ohms at 20° C, what is the resistance of each wire at 20° C so that the resistance of the combination does not change with temperature?
Calculate the linear speed due to the Earth's rotation for a person at a point on its surface located at 40o N latitude (this would be near the Ohio river valley, for instance). The radius of the E