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A tetherball leans against the smooth, frictionless post to which it is attached. The string is attached to the ball such that a line along the string passes through the center of the ball. The string is 1.40 long and the ball has a radius of 0.110 with mass 0.440. What is the tension in the rope? What is the force the pole exerts on the ball?
A mass of 0.450 kg rotates at constant speed with a period of 1.45 s at a radius of R 0.140 m . What is the rotation period for a mass of 0.550kg at the same radius
A parallel-plate air-filled capacitor having area 50 cm2 and plate spacing 1.3 mm is charged to a potential difference of 710 V, find the energy density between the plates
A skateboarder, starting from rest, rolls down a 12.5 m ramp. When she arrives at the bottom of the ramp her speed is 6.10 m/s. (a) Determine the magnitude of her acceleration, assumed to be constant. .m/s2 (b) If the ramp is inclined at 26.5° wit..
Calculate the edge length of a cube that has the same volume as a sphere of radius 4.0 cm. How much greater is the surface area of the cube than that of the sphere
Copper has 8.5×1028 electrons per cubic meter. How many electrons are there in a 25.0 cm length of 12-gauge copper wire, what is the average drift speed of the electrons along the wire
A star moving away from the Earth at 0.320c emits radiation that we measure to be most intense at the wavelength 530 nm. Determine the surface temperature of this star
The mass of a roller-coaster car, including its passengers, is 495kg. Its speed at the bottom of the track in the figure below is 17.00 m/s. The radius of this section of track is r1 = 26 m. Find the force that a seat in the roller-coaster car exerts..
A uniform 2.15- kg spinning disk with a radius of 0.233 m is brought to rest by a brake-pad pressed against the side 0.149 m from the rotation axis. What frictional force was applied by the brake pad
A 0.0017T magnetic field and a 5.7 x 10^3 N/C electric field both points in the same directions. Determine the magnitude and directions of the net force on the charge
A stunt pilot with mass of 80 kg performs a vertical circular dive of radius 800 m. What forces are acting on the pilot
A 5 mC charge is located 1.8 m away from another charge. If the force between the charges is 5.0 N, what is the magnitude of the other charge
A solar cell generates a potential difference of 0.400 V when a 150.0 ? resistor is connected across it, What is the emf of the cell
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