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A 5-cm-external-diameter, 10-m-long hot-water pipe at 80°C is losing heat to the surrounding air at 5°C by natural convection with a heat transfer coefficient of 25 W/m2 ?c °C. Determine the rate of heat loss from the pipe by natural convection, in kW.
What was the take-off speed? If this speed were increased by just 5.0%, explain how much longer would the jump be?
A bar magnet is moving with a velocity, v, in the plane of the page towards a conducting loop that is perpendicular to the bar magnet. calculate the poles of the bar magnet
Starting from rest, two skaters "push off" against each other on smooth level ice, where friction is negligible. One is a man and one is a woman. obtain the recoil velocity of the man relative to ice
A 29.0kg crate is initially moving with a velocity that has magnitude 4.08m/s in a direction 37.0 west of north. How much work should be done on the crate to change its velocity to 5.82m/sin a direction 63.0 south of east?
A raft is made out of 10 logs that are 56cm in diameter and are 6.1m long. How many people (68kg each) can stand on the raft with out getting there feet wet
A laser is used in eye surgery to weld a detached retina back intoplace. The wavelength of the laser beam is 514 nm, while the poweris 1.5 W. how many photons are emitted by the laser
A 1.00uF capacitor is connected in parallel with a 2.00uF capacitor, Find the potential on the negative plate of the 1.00uF caacitor and the equivalent capacitance of the two capacitors
Jim is driving his car at 32 m/s (72 mi/h) along a highway where the speed limit is 25 m/s (55 mi/h). How far does the police car travel before catching Jim
A person walks into a room and switches on the ceiling fan. The fan accelerates with constant angular acceleration for 15 s until it reaches its operating angular speed of 1.0 rotations/s after that its speed remains constant as long as the switch..
A light rod l.00 meter in length about an axis perpendicular to its length and passing through its center. Neglecting the mass of the rod, find the system kinetic energy when its angular speed is 2.50 rad/s
What is the net upward force on an airplane wing of area 20.0 m2 if the speed of air flow is 221 m/s across the top of the wing and 206 m/s across the bottom
A coin placed 31.0 centimeter from the center of a rotating, horizontal turntable slips when its speed is 49.8 cm/s. Determine what force causes the centripetal acceleration when the coin is stationary relative to the turntable
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