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Q. A uniform spherical shell of mass 9{rm kg} with diameter 54 {rm cm} has four small masses of mass 1.5 {rm kg} attached to its outer surface and equally spaced around it. This combination is spinning about an axis running through the center of sphere and two of the small masses.
Q. What must the charge (sign and magnitude) of a 1.46 g particle be for it to remain stationary while placed in a downward-directed electric field of magnitude 690?
Water flows over a section of Niagara Falls at the rate of 1.1 x10^6 kg/s and falls 55 m. How much power is generated by the falling water.
A small block of mass m = 1.5 kg slides, without friction, along the loop-the-loop track shown. the block starts from the point P a distance h = 54 m above the bottom of the loop of radius R = 17.0 m. What is the kinetic energy of the mass at the ..
A car travelling at 95 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after travelling 0.87m. What was the average acceleration of driver during the collision? State the answer in terms of "g's," where 1g = 9..
A 1.2µF capacitor is charged to a potential difference of 11.0V. The wires connecting the capacitor to the battery are next disconnected from the battery and connected across a second, initially uncharged, capacitor. The potential difference across t..
Find out the normal force exerted on the crate by the elevator.
A skier is accelerating down a 30.0 degree hill at 1.8 m/s^2. How long will it take her to reach the bottom of the hill, assuming she starts from rest and accelerates uniformly, if elevation change is 325 m.
A 13 g bullet traveling 215m/s penetrates a 2 kg block of wood and emerges cleanly at 157m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after bullet emerges.
A light spring with a spring constant of 80.0 N/m rests vertically on a table. A 2g balloon is filled with helium (0°C and 1 atm pressure) to a volume of 5.00 m3 and connected to spring, causing the spring to stretch and expand. How much does the ..
A dog pulls on a pillow with a force of 2.2 N at the angle of 40° above the horizontal. Find the x and y components of the force.
What is the required average power.
protons are projected with an initial velocity v0 = 10410m/s into a region where a uniform electric field E = 710 N/C is present. The protons are to hit the target that lies a horizontal distance of 1.27mm from the point where protons are launched..
Find out the total work done on the car by the external forces.
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