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The heating element of a room heater is rated at 750W when itis operated from a 120V power supply?
a) What is the resistance of the heating element?b) If the heating element is made of nichrome wire that is1.0mm in diamenter, how long is the wire? The resistivity ofnichrome is 1x10-6 ohm-m.c) If electricity costs ten cents per KW-hr, how much does itcosts to operate this heater for 2 hours and 45 minutes?
Assume 3 mol of neon (an ideal monatomic gas) at STP is compressed slowly and isothermally to 0.25 the original volume. The gas is then allowed to expand quickly and adiabatically back to its original volume.
A small-scale steame engine operates between the temperatures 20oC and and 300oC, Calculate the efficiency of the Rankine cycle
A diver leaves a 3-m board on a trajectory that takes her 2.2m above the board and then into the water a horizontal distance of 2.5m from the end of the board. At what speed did she leave the board
A 2.30kg hoop 2.20m in diameter is rolling to the right without slipping on a horizontal floor at a steady 3.00rad/s. What is the total kinetic energy of the hoop
parachutist with a camera, both descending at a speed of 13 m/s, releases that camera at an altitude of 110-m.
The work function of an element is 3.2 eV. Photons of a certain energy are found to eject electrons with a kinetic energy of 2 eV. What is the speed of the ejected electrons
A 60-g ice cube at 0°C is heated until 54 g has become water at 100°C and 6.0 g has become steam at 100°C. How much energy was added to accomplish the transformation
Fifty Circular turns of wire are wound closely together, so that all of them have a radius of close to 0.05,. what is the magnitude of the magnetic field at its center
A helicopter is ascending vertically with a speed of 4.50 m/s. At a height of 195 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground.
A sealed tube (0.5 L) in volume confines two moles of an ideal gas at a pressure of 2 atm. What is the average kinetic energy of a gas molecule
q1. a coiled telephone cord forms a spiral with 56 turns a diameter of 1.30 cm and an unstretched length of 60.0 cm.
The aorta is a major artery, rising upward from the left ventricle of the heart and curving down to carry blood to the abdomen, find the magnitude (in m/s2) of the blood's centripetal acceleration
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