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A distant galaxy is moving away from the earth with a speed that results in each wave- length received on the earth being shifted so that ?? = 2.25 ?0. Find the speed of the galaxy relative to the earth.
A system does 4.3 x10^4 J of work, and 7.7 x10^4 J of heat flows into the system during the process
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 104 m/s, and the radius of the orbit is5.00 106 m. What is the orbital speed of the second satellite
What is the total work W_fric completed on the block by the force of friction as the block moves a distance 8 rm m up the incline.
A piece of a wire, with the cross-sectional area of 0.5176 mm2 and 2.50 m long, has the resistance 1.28×10-1 ohms. What is the resistivity of the material of the wire
Two identical point charges are fixed to diagonally opposite corners of a square that is 0.420 m on a side. How much work is done by the electric force
A spherical metallic Christmas tree ornament has a diameter of 6.41 cm. If Saint Nicholas is by the fireplace, 1.37 m away, where will he see his reflection in the ornament
What are new charge on spheres - Two insulated charge Cu spheres A and B OF IDENTICAL size have charge qa and -3qa
A 4.95-kg ball, moving to the right at a velocity of +1.60 m/s on a frictionless table, Find the final velocities of the balls if the collision meet the following conditions
A lightweight electric car is powered by ten 12-V batteries. At a speed of 70 km/h, the average frictional force is 1050 N. What must be the power of the electric motor if the car is to travel at a speed of 70 km/h
Presume the child remains horizontal during the fall to the floor. Note that a more complicated fall could result in a head velocity greater or less than the speed you calculate.
A 370-?F capacitor and a 10m H inductor are in series with a 365 ? resistor. What is the impedance at the resonant frequency
To measure the static friction coefficient between a 2.2-kg block and a vertical wall, the setup shown in the drawing is used. What is the coefficient of static friction
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