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A 50-g block of an unknown material is at 530°C. It is dropped into a thermally insulated cup containing 0.07L of water at 20°C. If the temperature of the compound rises to 50°C, what is the specific heat of the unknown material?
A step-down transformer is used for recharging the batteries of portable electronic devices. Find the power delivered to the DVD player
If they travel the length of the tube at full speed (they don't, because they are accelerating), how long is the tube in the electrons' reference frame
The filament of a light bulb has a temperature of 3.20E+3 °C and radiates 40 watts of power. The emissivity of the filament is 0.360. Find the surface area of the filament
A 40.0 m long uniform bridge span weighs 6.00 x 104N. What force do the bridge and the car exert on the left pier
a crane is lifting a 500 kg payload straight up at a constant speed of 0.7 m/s. What is the power output of the crane
compare with the force of gravitational attraction between them.Find the position of the particle after this time.
A rifle with a weight of 30 N fires a 6.0-g bullet with a speed of 200 m/s. find the recoil speed of the man and rifle
A 30 N block is pulled along a horizontal surface by a 10 N force parallel to the surface. evaluate the coeffient of kinetic friction
A fission-based nuclear bomb (such as those used in World War II) uses the same nuclear reactions, What is the average power Pavg of such a nuclear bomb
What is the force acting on the electron (magnitude and direction) ? What is the electric field (magnitude and direction ) at the point where the electron is located
When red light in a vacuum is incident at the Brewster angle on a certain type of glass, the angle of refraction is 29.2°. What is the Brewster angle
an explorer is caught in a whiteout in which the snowfall is so thick that the ground cannot be distinguished from the
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