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Nichrome wire is used in some radiative heaters.
(a) Find the resistance needed if the average power output is to be 1.15 kW utilizing 120 V AC. (b) What length of Nichrome wire, having a cross-sectional area of 5.15 mm2, is needed if the operating temperature is 500°C?
m
(c) What power will it draw when first switched on?
kW
A piece of wood is 6.00 m long, 0.260 m wide and 0.060 m thick. Its density is 600kg/m cubed. What volume of iron ( P iron = 7.8 x 10 cubed kg/m cubed) must be fastened underneath the wood to sink it so that the top surface of the wood is just even w..
A 10,000 kg railroad car is rolling at 2 m/s when a 400 kg load of gravel is suddenly dumped in. What is the railroad cars speed just after the gravel is dumped in.
A spring has an unstretched length of 12cm. When an 80 g ball is hung from it, the length increases by 4.0 cm.Then the ball is pulled down another 4.0 cm and released. a) What is the spring constant? b) What is the period of the oscillation?
Density of Aluminium is 2.7g/cm3 or 2.7g/ml. How heavy (in grams) would be the coke can if instead of soda it would be filled in with aluminium? The volume of a soda can is 303 ml.
what is the entropy change during the free expansion of 1.70 moles of an ideal gas from an intial volume of 1.60 liters into an evacuated volume of 1.90 additional liters
Imagine a "free" electron and a "free" proton held midway between the plates of a charged equivalent plate capacitor. When released, how do their accelerations and directions travel compare.
What is the ratio of the cardinals magnitude. One mole of tungsten (6 1023 atoms) has a mass of 184 grams, and its density is 19.3 grams per cubic centimeter. You have a long thin bar of tungsten, 2.3 m long, with a square cross section, 0.15 cm on..
An archer puts a 0.33 kg arrow to the bowstring. An average force of 183 N is exerted to draw the string back 1.3 m. suppose that air resistance is negligible.
The radar system at an airport broadcasts 11 microwaves with 150 of power. An approaching airplane with a 31 cross section is 24 away. suppose that the radar broadcasts uniformly in all directions and that the airplane scatters microwaves uniformly..
Tension is maintained in a string. The observed wave speed is 25 m/s when the suspended mass is 3.0 kg. (a) What is the mass per unit length of the string?
Compute the magnitude of the average acceleration
A rock is tossed straight up with a velocity of 14 m/s When it returns, it falls into a hole 10m deep.
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