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A piece of metal is pressed against the rim of a 2.8- kg, 25- cm-diameter grinding wheel that is turning at 2800 rpm. The metal has a coefficient of friction of 0.80 with respect to the wheel. When the motor is cut off, with how much force must you press to stop the wheel in 20.0 s?
A 0.54 cm high object is placed 8.7 cm in front of a diverging lens whose focal length is -7.5 cm. What is the height of the image
Two tiny conducting spheres are identical and carry charges of -18.2 ?C and +50.3 ?C, What is the magnitude of the force that each sphere experiences
Five equal-mass particles (A-E) enter a region of uniform magnetic field directed into page. They follow the trajectories. Rank the particles on the basis of their speed.
A 266 kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. Find the tension in the rope
Compute the Force of Friction (Ff) for a 5kg aluminium block being pulled with constant velocity (uniform motion), up the steel plank that is at a 30degrees angle to the horizontal.
A ball (mass 100g) is recorded to have a speed of 2m/s after falling 5m under gravity. What is the work done by air resistance
What is the total force on the bottom of a swimming pool 29.5m by 9.1m whose uniform depth is 1.6m, What is the absolute pressure on the bottom of a swimming pool
A wedge of mass M and angle ? is placed on a flat frictionless surface. A crate of mass m is placed on the wedge at height h and starts sliding down the wedge without friction. Find the acceleration of the crate and the wedge relative to the gr..
A baseball thrown at an angle of 55.0? above the horizontal strikes a building 17.0m away at a point 6.00m above the point from which it is thrown. Find the magnitude of the initial velocity of the baseball
Two hikers begin on opposite sides of a circular lake and walk around the lake in the same direction. How far does the faster hiker walk before catching up to the slower one
An ideal monatomic gas at first has a temperature of 311K and a pressure of 7.57atm. It is to expand from volume 571 cm3 to volume 1390 cm3.
flash decides to make a capacitor at homes. Flash takes two thin, flat, rectangular aluminum plates measuring 35 cmby 50 cm. find the capacitance of flash's creation
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