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A heat engine working between 170.0oC and 400.0oC, takes in 1.639×107 J of heat and delivers 4.200×106 J of work per cycle. What is its efficiency? What is the maximum possible efficiency of an engine working between these two temperatures?
If the magnetic field of the wire is 2.0×10?4 and the electron moves at 1.0×107 , what is the magnitude of the force exerted on the electron
An electric point charge of Q1 = 7.85 nC is placed at the origin of the real axis. Another point charge of Q2 = 3.83 nC is placed at a position of p = 3.99 m on the real axis. At which position can a third point charge of q = -7.31 nC be placed so th..
A 0.954 kg toy car is powered by four AA batteries (6.00 V total) connected directly to a small DC motor. What is the average current supplied to the car's motor
One recent study has shown that x rays with a wavelength of 0.0050 nm can produce significant numbers of mutations in human cells. Calculate the energy in eV of a photon of radiation with this wavelength.
A car moves in a circle with constant speed. The tires do not slip on the road. What is the direction of the friction force on the tires by the road
A ball moving at 5ms collides head on elastically with a ball at rest. what are the velocities of the two balls after the collision
The positron is a particle with the same mass as an electron but charge +e. what's the radius of its trajectory in the bubble chamber
Calculate the period of a satellite orbiting the Moon, 130km above the Moon's surface. Ignore effects of the Earth
A mass of 180g is held by a horizontal spring of constant 22 N/m. It is displaced from its equilibrium position and released from rest. What is the magnitude of initial displacement
An electric vehicle starts from rest and accelerates at a rate of 1.8 m/s2 in a straight line until it reaches a speed of 29 m/s. How far does the vehicle move from start to stop
Sunlight reflects the surface of a swimming pool. At what angle the reflected light is 100% polarized
An emf is induced in a conducting loop of wire 1.14m long as its shape is changed from square to circular, Find the average magnitude of the induced emf if the change in shape occurs in 4.23s
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