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What is the efficiency of an engine that has 2200 J of heat added during combustion and loses 1000 J of heat in the exhaust?
A 0.954-kg toy car is powered by 2 C cells (3.00V total) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 52.6%, What is the average current supplied to the car\'s motor
A motor has coils with a resistance of 26 Ω and operates froma voltage of 240 V. When the motor is operating at its maximumspeed, the back emf is 111V.
The flywheel in a car is a solid cylinder with a mass of85 kg, a radius of 12 cm, and a length of 5.0 cm. What is the kinetic energy of the cylinder
Air bags are designed to deploy in 10 ms. Estimate the acceleration of the front surface of the bags as it expands. Express your answer in terms of the acceleration of gravity g
Two stationary point charges of 5.00nC and 2.00nC are separated by a distance of 60.0 cm. What is the electric potential energy of the electron
Calculate the yearly cost of electricity, in billions of dollars, required to operate 100 million TVs, assuming their power consumption averages 175 W and the cost of electricity averages 10.5 cents/kW·h.
Tarzan swings on a 28.2 m long vine initially inclined at an angle of 20 degrees from the vertical. A) What is his speed at the bottom of the swing if he starts from rest?
You are in a hot air balloon (yes, another balloon problem!) rising from the ground at a constant velocity of 2.70 m/s upward. How long does the cork remain in the air
If the car in problem 1 traveled at 36.0km/h during the first part of the trip and at 90.0km/h during the remainder, Calculate the average velocity for each part of the trip
A certain digital camera having a lens with focal length 7.50cm focuses on an object 1.90m tall that is 4.70m from the lens. How far must the lens be from the photocells
A circular disk, centered at the origin of a coordinate system, is rotating at a constant angular velocity ?0. In Cartesian coordinates, what is the velocity vector of the point P located at the cartesian coordinate (1,1).
At which angle will the photon scatter with respect to its original direction? (The accepted unit abbreviations for angles are either 'deg' for degrees or 'rad' for radians.)
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