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1) What is meant by the expression "(I^2)*R losses" in electric circuits?
2) Name and describe two electrical applications where: (a) Joule heating is desirable, (b) Joule heating is undesirable.
3) Given two different resistances, how does the rate of Joule heating in them differ if they are connected to a fixed voltage source: (a) in series? (b) in parallel?
4) A resistor is submerged in an insulated container of water. A voltage of 12 V is applied to the resistor resulting in a current of 1.2 A. If this voltage and current are maintained for 5 minutes, how much electrical energy is dissipated by the resistor?
5) During the 5 minute period described in question 4, the water in the insulated vessel undergoes a temperature increase of 20 °C. Assuming that all of the electrical energy dissipated by the resistor was transferred to the water as heat, what is the mass of the water? (the specific heat of water is 4186 J/kg?°C)
A 3.00-g bullet traveling horizontally at 400 m/s hits a 3.00-kg wooden block, which is initially at rest on a smooth horizontal table. The bullet buries itself in the block without passing through. The speed of the block after the collision is:
You have fabricated a one-dimensional well of width 12nm, and measurements show that the energy difference between the ground state and the first excited state is 0.16eV. What is the effective mass of the electrons
A block of mass M is at point A on the slope (the slope is just a %u201Cregular roller coaster ride %u201D, What is the velocity at the bottom of the slope at point B which is 5 meters below point A
Suppose that while moving into an apartment you move a refridgerator into place by sliding it across the floor. What is the least force you could exert on the fridge to move it
You and your friend are practicing pass plays with a football. You throw the ball at 35 degrees above thehorizontal at 19 m/s.
an object at rest explodes into three pieces of equal mass. one moves east at 20.0 ms while a second moves northwest at
Modeling the optical trap as a Hookean spring, evaluate the trap stiffness using the Boltzmann distribution. Determine the sphere diameter by comparing the Stokes drag and the tweezer force that balances the drag.
Two beams of planar wavefront, 633-nm coherent light, whose directions are 120o apart, strike a photographic emulsion of index 1.6. Sketch the arrangement, showing the orientation of the planes of constructive interference within the emulsion.
A skier wears a jacket filled with goose down that is 15 mm thick. Another skier wears a wool sweater that is 7.00 mm thick. Both have same surface area.
if a boat floats in two types of liquid, one more desnse than theother, where is the buoyant force greater on the boat
A spaceship traveling at speed .5c towards earth ejects a spacepod traveling in the forward direction at speed .25c relative to the spaceship, what is the speed of the light signal relative to the earth in terms of c
A sphere that is a perfect blackbody radiator has a radius of 0.080 m and is at 250°C in a room where the temperature is 29°C. find the net rate at which the sphere radiates energy
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