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A spacecraft moving away from Earth emits a 4496 Hz signal. Ascientist on Earth measures the signal to be 4494 Hz. What is thespeed of the spacecraft relative to Earth?
An electron gun in an old television picture tube is a device that uses an electric field to accelerate electrons. What magnitude of electric field is needed to accelerate an electron from rest to a speed of 4.0x10^7 m/s in a distance of .01m.
A5.25-g block starts from rest at the top of a frictionless hillthat is inclined 21.0º with respect to the horizontal. The hill is125 m long. At the bottom of the hill, the surfaceis level and the coefficient of kinetic friction between thesurface an..
Waves on a 10 meter rope travel at 19 m/s. You shake the rope back and forth until you get a standing wave with a single antinode. What is the wavelength and frequency of each standing wave
A slide projector needs to create a 98 cm high image of a 2.0 cm tall slide. The screen is 300 from the slide. How far should you place the lens from the slide
An infinite slab of conducting material with a thickness of 2d lies in the x-y plane between z = -d and z = d. Use Gauss' law to calculate the electric field inside the slab
A container is filled to the brim with 1.6 L of mercury at 20°C. As the temperature of the container and mercury is increased to 49°C, compute the linear expansion coefficient of the material
If the person can view the image produced by the microscope with a completely relaxed eye, and the magnification is -4825, what is the focal length of the objective
A billiard ball strikes and rebounds from the cushion of a pool table perpendicularly. What is the average net force (magnitude and direction) exerted on the ball by the cushion
air is contained in a vertical piston-cylinder assembly by a piston of mass 50 kg and having a face area of 0.01 m2.
A college professor keeps 0.25 L (0.00025 m^3) of hot coffee in a thick styrofoam container. at what rate is heat flowing out through the walls of the container
Two skaters, one with mass 65 kg and the other with mass 80 kg, stand on an ice rink holding a pole of length 9 m and negligible mass. How far does the 80 kg skater move
What is the magnitude of the force on an electron at a distance of 3.86 Angstrom from the thorium nucleus? What would the magnitude of the force be if the distance of the electron from thenucleus were doubled?
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