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BAED-PHYC2121 General Physics 1
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A Ferris wheel, rotating initially at an angular speed of 0.50 rad/s, accelerates over a 4.0-s interval at a rate of 0.10 rad/s2. What angular displacement does the Ferris wheel undergo in this 7.00-s interval?0%
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A ping-pong ball has an average density of 0.0840 g/cm3 and a diameter of 3.80 cm. What force would be required to keep the ball completely submerged under water?
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A 2.00-kg copper rod is 47.00 cm long at 25°C. If 50,000 J are transferred to the rod by heat, what is its change in length? ccopper = 387 J/kg⋅°C and αcopper = 17 × 10−6/°C.
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A circular disk is rotating about a central axis with an angular velocity which is increasing at a constant rate. Point 1 on the disk is located at a distance0%
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A 0.19-m radius grinding wheel takes 2.8 s to speed up from 3.0 rad/s to 12.0 rad/s. What is the wheel's average angular acceleration?0%
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The use of fiberglass insulation in the outer walls of a building is intended to minimize heat transfer through the wall by what process?
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A waterfall is 140 m high. What is the increase in water temperature at the bottom of the falls if all the initial potential energy goes into heating the water? (g = 9.8 m/s2, cw = 4,186 J/kg⋅°C)
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Water (density = 1 × 103 kg/m3) flows at 15.5 m/s through a pipe with radius 0.040 m.The pipe goes up to the second floor of the building, 3.5 m higher, and the pressure remains unchanged. What is the speed of the water flow in the pipe on the second floor?
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A 200-N uniform ladder, 12.0 m long, rests against a smooth vertical wall. The coefficient of static friction between ladder and floor is 0.35. What minimum angle can the ladder make with the floor before it slips?0%
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A 55-N crate is pulled up a 4-m inclined plane by a worker at constant velocity. If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 25 N between the crate and the surface, what is the force applied by the worker?
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