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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?
The sound a string guitar can be varied by changing the tension in each string. what are the wave's natural frequencies
A transparent oil with index of refraction 1.28 spills on the surface of water (index of refraction 1.33), determine the thickness of the oil slick
At 20C and 750 torr pressure, the mean free paths for argon gas(Ar) and nitrogen gas(N) are lambdaAr = 9.9 x 10^-6 cm, What is the mean free path of argon
A 100 g aluminum calorimeter contains 250 g of water. The two substances are in thermal equilibrium at 10°C. Determine the specific heat of the unknown second sample
What is the CD's moment of inertia for rotation about a perpendicular axis by the edge of the disk.
The accompanying pressure-volume graph shows an engine cycle with one isothermal process, B-C. What is the net work done by the gas during one cycle
Answers for an elevator are moving down with an acceleration of 3.360 m/s. what would be the apparent weight of a 64.20 kg man in the elevator.
A young boy swings a yo-yo horizontally above his head at an angular acceleration of 0.32 rad/s^2. If the tangential acceleration of the yo-yo at the end of the string is 0.15 m/s^2, how long is string.
A microwave oven with microwaves 12.2 cm long has a power output of 760 Watts. Find the number of photons emitted per second
A straight wire in a magnetic field experiences a force of 0.030 N when the current in the wire is 2.7 A. What is the new current
suppose the PASCO track is 120 cm long. Assume the track is frictionless, and suppose one end is lifted by 2.55 cm. Find the angle between the track and the horizontal
A 300-m-wide river flows due east at a uniform speed of 4.4 m/s. A boat with a speed of 7.6 m/s relative to the water leaves the south bank pointed in a direction 25o west of north. How long does it take for the boat to cross the river
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