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A copper rod of cross-sectional area 12.2 cm2 has one end immersed in boiling water and the other in an ice-water mixture, which is thermally well insulated except for its contact by the copper. The length of the rod among the containers is 19.0cm, and the rod is covered by a thermal insulator to prevent heat loss from the sides. How many grams of ice melt each second? (The thermal conductivity of copper is 390 W/m-C°.)
A flight attendant pulls hero 70 N flight bag a distance of 253 m along a level airport floor at a constant velocity. The force she exerts is 40N at an angle of 52.0 degrees above the horizontal.
a banked circular highway curve is designed for traffic moving at 55 kmh. the radius of the curve is 207 m. traffic is
The magnitude of each of the charges in the figure below is 8.65 10-12 C. The lengths of the sides of the rectangles are 3.12 cm and 5.40 cm. Find the magnitude of the electric field at the center of the rectangle in the figures below
neglect air resistance for the following. a soccer ball is kicked from the ground into the air. when the ball is at a
a 200 g 40.0-cm-diameter solid cylindrical turntable rotates on frictionless bearings at 60.0 rpm. a 20.0 g block sits
When you put water in a kitchen blender, it begins to travel in a 3-cm-radius circle at a speed of 1 m/s. How quickly is the water accelerating
a. 1.6m long string fixed at both ends vibrates at resonant frequencies of 780hz and 1040hz with no other resonant
you shine red laser light with wavelength 670 nm through two narrow slits where the spacing between the slits is 0.005
If a silver wire has a resistance of 13.0 Ω at 20.0°C, what resistance does it have at 37.0°C? Neglect any change in length or cross-sectional area resulting from the change in temperature.
An 8-g bullet is fired into a 170 g block that is initially at rest at the edge of a table of 1m height. The bullet remains in the block, and after the impact the block lands d = 2.10 m from the bottom of the table. Determine out the initial speed..
An electron moves to the right with a speed of 0.83c relative to the laboratory frame. Find the speed of the proton relative to the laboratory frame
four passengers with combined mass 250 kg compress the springs of a car with worn out shock absorbers by 4.00cm when
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