Find the amount of heat expelled in each cycle
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.
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At t = 0 s, the block is 20.0 cm below the equilibrium position and moving upward with a speed of 200. cm/s. What is the block's speed when the displacement from equilibrium is 30.0 cm?
Three 1.50-V cells, each with an internal resistance of 0.0500?, are connected in series to form a battery with a current of 0.850A in each cell. Find the internal resistance of the battery.
The board of a pharmaceutical company has eleven members. One board member will be selected as vice president of marketing, and a different board member will be selected as vice president of research. How many different arrangements of the two vic
A parent can choose from 5 types of protein, 6 vegetables and 4 desserts. If the parent serves a meal of 1 protein, 1 vegetable and 1 dessert to the family, how many different meals can be served?
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.
Suppose your body is rotated about an axis that (1) runs vertically through your spine, or an axis that (2) runs horizontally though your hips. In which case is the moment of inertia bigger?
Two concentric circles are such that a chord of the larger, 36 cm long, is trisected by the smaller. The sum of the radii of the two circles is also 36 cm. Find the length of the radius of the larger circle.
Points B and C are on a circle with radius 5 and lines Ab and AC are tangent to the circle. Let D be a point such that AD perpendicular to AB and BD perpendicular to BC. What is the length of AD?
For safety, medical equipment connected to patients is often powered by an isolation transformer, whose primary is connected to 120-V AC power and whose secondary delivers 120-V power.
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