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A heat engine performs 267 J of work in each cycle while also delivering 189J of heat to the cold reservoir. Find the efficiency of the heat engine. Give your answer in percent (%) with 3 significant figures.
A 5 cm by 5 cm square loop of wire is rotating at 30 rpm in a uniform magnetic field of strength 3.0T. The direction of the field is perpendicular to the axis of rotation of the loop.
A golf ball strikes a hard, smooth floor at an angle of 30.0?? and, as the drawing shows, rebounds at the same angle. What is the magnitude of the impulse applied to the golf ball by the floor
A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. What was the initial speed of the tennis ball
A bird flies 3.0 km due west and then 2.0 km due north. What is the magnitude of the bird's displacement
A shaft rotates at a rate of 80 RPM against a constant torque of 1000 N.m. Calculate the power required to rotate the shaft
The wave length associated with the cutoff frequency for silver is 325.0 nm. Find the maximum kinetic energy of the electrons
In a heart pacemaker, a pulse is delivered to the heart 81 times per minute. What is the capacitance of the capacitor
A simple pendulum consists of a small object of mass 3.0 kilogram hanging at the end of 2.0 meter long light string that is connected to a pivot point. Obtain the magnitude of the torque (due to the force of gravity) about this pivot point
in an amusement park ride cars are suspended from l 4.21 m cables attached to rotating arms at a distance of d 6.28 m
A 1.5 kg copper block is given an initial speed of3.00m/s on a rough horizantal surface. Because of friction, theblock finally comes to rest. what happens on the remaining energy
Particles P and Q areinitially at rest 1.0 m apart. P has a mass of0.10 kg and Q a mass of 0.30kg. P and Q attract eachother with a constant force of 10–2 N. No external forces act on the system.
A hot iron horseshoe (mass = 0.470 kg), just forged, is dropped into 1.44 L of water in a 0.340 kg iron pot initially at 19.1°C. calculate the initial temperature of the hot horseshoe
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