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One kilowatt an hour (kWh) is the amount of work or energy generated when one kilowatt power is supplied for a time of one hour. A kilowatt an hour is the unit of energy used by power companies when figuring your electric bill. Find the number of joules of energy in one kilowatt an hour.
a baseball player hits a triple and ends up on third base. a baseball diamond is a square each side of length 29 m with
The brakes are applied to a car traveling on a dry, level highway. A typical value for the magnitude of the car'sacceleration is 5.35 m/s2. If the car's initial speed is 29.7 m/s, how long does it take to stop and how far does it travel, starting ..
A 2 kg ball has been thrown vertically upward. If we ignore the air resistance, what are the direction and size of the net force acting on the ball while it is traveling upward?
A 950kg sports car collides into the rear end of a 2500kg SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping. The police officer, knowing that the coefficient of kinetic friction be..
A concave makeup mirror is designed so that a person 22 cm in front of it sees an upright image magnified by a factor of two. What is the radius of curvature of the mirror
A hook is boxing primarily involves horizontal flexion of the shoulder, while maintaining a constant angle at the below. What is the average speed of the fist during the hook
1.) Hold the baseball and sheet of paper side by side. Predict which one will travel with the faster motion when released. Then drop them both at the same time. Did your prediction match the results?
The turbines in a hydroelectric plant are fed by water falling from a 50-m height, what is the mass flowrate of water required to power a 200-watt light bulb
A model of a red blood cell portrays the cell as a spherical capacitor, a positively charged liquid sphere of surface area A separated from the surrounding negatively charged fluid by a membrane of thickness t. Calculate the charge on the surface o..
The intensity of the Sun's light in the vicinity of the Earth is about 930 W/m2. Imagine a spacecraft with a mirroredsquare sail of dimension 1.22 km. Estimate how much thrust (innewtons) this craft will experience due to collisions with theSun's ..
Two vehicles A & 13 are traveling west and south, respectivelytoward the same direction where they collide and lock together.Before the collision A (total weight 900lb) is moving with a speedof 40mi/h and B (1200 lb) has a speed of 60 mi/h.
A tank whose bottom is a mirror is filled with water to a depth of 15.0 centimeter. Determine the apparent depth of the image of the fish
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