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1. Convert them
(a) 456 cal to joules
(b) 22.3 j to Calories
(c) 234 kj to Calories
(d) 12.4 Cal to joules
2. Calculate the amount of heat required to heat a 3.5-kg gold bar from 21 degrees celcius to 67 degrees celcius.
3. If 57 j of heat are added to an aluminum can with a mass of17.1 g, what is its temperature change?
4. Calculate the final temperature of 32 ml of ethanol initially at 11 degrees celcius upon absorption of 562 j of heat. (density of ethanol = 0.789 g/ml)
5. How much heat in kilojoules is required to heat 56 L of water from 85 degrees F to 212 degrees F?
6. A room contains 48 kg of air. How many kilowatt-hours of energy are necessary to heat the air in the house from 7 degrees celcius to 28 degrees celcius? The heat capacity of air is 1.03 j/g degrees celcius.
The two charges in the figure below are separated by d = 1.50 cm. (Let q1 = -16.5 nC and q2 = 26.5 nC.) Find the electric potential at point A
A 0.30 kg puck, initially at rest on a frictionless horizontal surface, is struck (inelastically) by a 0.20 kg puck that is initially moving along the x-axis with a velocity of 2.0 m/s. After the collision, the 0.20 kg puck has a speed of 1.0 m/s ..
A light beam having a wavelength of 470. nm in air is directed into glycerine (n = 1.47). What is the frequency of the light in the glycerine
In the Bohr theory of the hydrogen atom, an electron moves ina circular orbit about a proton. The radius of the orbit is0.53*10^-10m. Find the electrostatic force acting on each particle
what is the maximum weight of the crate that the system can support? What is the angle needed for equilibrium.
A ball is thrown horizontally from the top of a building with an initial speed of 12 m/s. how high is the building
Light from a helium-neon laser (633nm) illuminates a circular aperture. Determine what is the aperture's diameter
The air passes through a large-diameter glass tube, then through a small-diameter tube, and nally through a large-diameter tube again. Find the velocity of the air in the small-diameter tube
The filament of a light bulb has a temperature of 2.85E+3 °C and radiates 40 watts of power. The emissivity of the filament is 0.344. Find the surface area of the filament
Using the periodic boundary condition, ?k(x+L) = ?k(x) and noting that e(i2pn)=1, determine the allowed values of k in terms of L and an integer n. Are negative values of n allowed?
A car driving at 20 m/s is approaching a stoplight. As the stoplight turns red, the driver decides that the car is going too fast to stop at the white line and hits the brakes hard. How fast was the car going when the driver changed the rate of dec..
Steel rails 25.0m long are laid end to end with gaps between them to account for thermal expansion. Part A If the track is laid when it's 18 degrees C, how large should the gaps be to allow temperatures up to 39 degrees C?
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