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A race car(m=800kg) starting from rest completes a 450m dragrace in a time of 3s. The car's final speed is 90m/s.Neglecting friction and air resistance, what is the engine's average power output?
In addition to dark matter cosmologists have proposed dark energy. The reason for this was the discovery of: A) slowing down of the expansion of the universe B) cosmic background radiation C) acceleration of the expansion of the universe D) gravitati..
Consider n moles of an ideal monatomic gas placed in a vertical cylinder. The top of the cylinder is closed by a piston of mass M and cross-section A. Initially the piston is fixed, and the gas has temperature T0 and volume V0.
Two waves with identical frequency but different amplitudes A1 = 4.0 cm and A2 = 1.0 cm, occupy the same region of space (are superimposed). What is the amplitude of the resulting wave in that case
a ruler is accurate when the temperature is 25deg c. when the temperature drops to -20deg c the ruler shrinks and no
A singly charged positive ion has a mass of 2.37 10-26 kg. After being accelerated through a potential difference of 246 V, Calculate the radius of the path of the ion in the field
You are now studying a length of wire that has been coiled up to create a circular coil of 4 turns all arranged compactly, The loop has radius of 0.0240 m and a current of 49.5 A, What is the strength of the magnetic field at the center of the loop
A thin rectangular plate of uniform areal density ? = 2.84 kg/m2 has length of 35.0 cm and width of 21.0 cm. Calculate the mass of plate
The mass of a regulation tennis ball is 58.0 g (although it can vary slightly), and tests have shown that the ball is in contact with the tennis racket for 31.0 ms. what impulse did he exert on the ball
Two capacitors are connected to a battery. The battery voltageis V = 80 V, and the capacitancesare C1 = 2.00 μFand C2 = 4.00 μF. Determine the total energy stored by the two capacitors when they are wired (a) in paralleland (b) in series.
A real battery is not just an emf. We can model a real 1.5v battery as a 1.5v emf in series with a resistor known as the "internal resistance", What is the potential difference between the terminals of the battery
A student is skateboarding down a ramp that is 6.0m long andinclined at 18 degrees with respect to the horizontal. find the speed at the bottom of the ramp
A 0.39 T magnetic field is perpendicular to a circular loop of wire with 55 turns and a radius of 13 cm. what is the magnitude of the induced emf
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