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A boy exerts a force of 225 N on a lever to raise a 1.25 x 10 3-N rock a distance of 13 cm. If the efficiency of the lever is 88.7%, how far did the boy move his end of the lever?
An golf ball sits on the optical axis of a spherical mirror at a distance of 17 cm. A virtual image is formed a distance of 6 cm away from the mirror. What is the mirror's focal length (include sign if negative)
What is the current in amperes in a wire of radius. The parallel plates in a capacitor, with a plate area of 8.70 cm2 and an air-filled separation of 3.30 mm, are charged by a 8.90 V battery.
An induced emf occurs in a conducting loop of wire 1.12m long as its shape is changed from square to circular. What is the average magnitude of the induced emf if the change in shape occurs in 4.25 sec and the local 0.105T magnetic field is perpendic..
A ball is thrown with a velocity of 11.94 m/s at an angle of 43 degrees with the horizontal from an initial height of 1.76 m above the ground. Find the maximum height of the ball
A 12.0 m long conveyor belt, inclined at 40.0°, is used to transport bundles of newspapers from the mailroom up to the cargo bay to be loaded on to delivery trucks. Each newspaper has the mass of 1.00 kg, and there are 26 newspapers per bundle. Concl..
A spring has of constant k=1200 N/m is compressed by 8.0cm. A 2.5kg block is placed against the compressed spring. find the resulting kinetic energy and speed of the block
A 50 g block of ice at 0 °C rests in a pan in a room at 22 °C and melts completely. What is the entropy change (in cal/K) in the ice system
An electron in a circular path perpendicular to a constant magnetic field with a magnitude of 1.00mT. The angular momentum of the electron about the center of the circle is 3.000*10^-25. Evaluate the radius of the circular path
The height of the upper falls at Yellowstone Falls is 32.2m. When the water reaches the bottom of the falls, its speed is 25.8m/s. what is the speed of the water at the top of the falls
Determine the simple harmonic motion of the spring what ac velocity is ball moving
I am rising upward in a hot air balloon. I am holding my coffee container and i accidentally let go of it when I am leaning out and enjoying the view. Whats the greatst height the container achieved in its flight
metal sphere of radius 32 cm has a net charge of 3.0 multiply.gif 10-8 C. What is the electric field at the sphere's surface
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