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A lawnmower has a six horsepower engine (1HP=750W). The engine had an efficiency of 20%. The throttle is set so that the engine cycles 10 times per second. Find the amount of heat expelled in each cycle.
a 330 kg piano is pushed 3.6 m up a 28 degree incline by three men starting at rest at the bottom of the hill and ending at 41 cm/s. What is the net work done on the piano
Describe the role of electrical forces in nuclear fission. When a nucleus undergoes fission, what role can the ejected neutrons play
A bullet leaves a standard 45-caliber pistol (5.0-in. barrel) at a speed of 262 m/s. If it takes 1 ms to traverse the barrel, determine the average acceleration experienced by the 16.2-g bullet within the gun and after that compute average force e..
A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H of 33.0 m above sea level, directed at an angle above the horizontal with an unknown speed v0. The projectile remains in..
A wheel is spinning at 46 rad/s when an acceleration of 0.75 rad/s2 is applied. If the acceleration lasts for 140 revolutions, what is the final angular speed
A pulley of radius 20cm and moment of inertia is suspended from a ceiling and has a long string of negligible mass wound around it. A ball of mass 1kg is connected to the string and released from rest from a height of 2m above the floor. Calculate th..
A crane lifts a steel sub (dens. 7.8 x 10^3 ) of mass 20,000 kg. What is the tension in the lifting cable
An evacuated spherical diving bell containing a camera is in the ocean at a depth of 195 m. Find the magnitude of the total force on the port
A soccer player kicks the ball toward a goal that is 37.0 m in front of him. The ball leaves his foot at a speed of 28.8 m/s and an angle of 76.4 ° above the ground. Find the speed of the ball when the goalie catches it in front of the net.
the period of a pulsating variable star may be estimated by considering the star to be executing radial longitudinal
Which container has more gas molecules?
A battleship simultaneously fires two shells toward two identical enemy ships. One shell hits ship A, which is close by, and the other hits ship B, which is farther away. The two shells are fired at the same speed. Assume that air resistance is negli..
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