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In a physics lab experiment, a spring clamped to the table shoots a 19g ball horizontally. When the spring is compressed 21cm , the ball travels horizontally 5.0m and lands on the floor 1.6m below t
How long would a 2.90 kW space heater have to run to put into a kitchen the same amount of heat as a refrigerator (coefficient of performance = 2.68) does when it freezes 1.73 kg of water at 18.8&de
It takes electricity to run the motor on the refrigerator. If your cost of electricity is 10 cents per kilowatt*hour, how much does it cost (in cents - do not enter units) to cool your lunch down?
An engine has a hot reservoir temperature of 935 K and a cold reservoir temperature of 616 K. The engine operates at three-fifths maximum efficiency. What is the efficiency of the engine?
To deposit 14000 J of heat in the house, the heat pump requires 796 J of work. Determine the temperature of the well water. Give answer in K. Do not enter unit.
A coil is connected to a 60 Hz ac generator with a peak emf equal to 80 V. At this frequency the coil has an impedance of 14 and a reactance of 12 . (a) What is the peak current in the coil?
Calculate the ratio of the number of primary windings of the transformer to the number of secondary windings of the transformer.
A 35.0 cm diameter coil consists of 30 turns of circular copper wire 2.0 mm in diameter. A uniform magnetic field, perpendicular to the plane of the coil, changes at a rate of 3.60 x 10-3 T/s. (a)
The central maximum of a single-slit diffraction pattern has a width of 2.00 cm when measured on an observing screen 1.00 m away. If the illumination wavelength is 632.8nm what is the slit width?
Calculate the overall magnification of a compound microscope that uses an objective lens with a focal length of 0.50 cm, an eyepiece with a focal length of 2.50 cm, and a distance of 18 cm between
A: What would be the length of one day if the Earth spun so fast that bodies floated at the equator? Radius of the Earth being about 6380 km?
Find an expression for the minimum potential difference V between the cathode and anode for electrons to reach the anode?
Describe how the toroidal solonoid or toroidal magnetic field can be used to observe the Aharonov-Bohm effect.
In electronic equipment, wires that carry equal but opposite currents are often twisted together to reduce their magnetic effect at distance points. Why is this effective?
A parallel plate capacitor is immersed in sea water. Find the ratio of RMS conduction current to RMS displacement current if voltage V(t) = Vo Cos(2*pi*f*t) is applied to the capacitor. f = 3 x 10^7
You are hanging with your hands on a horizontal conducting wire that is immersed over a distance of 1m in a horizontal, transverse magnetic field of 10T. How much current is needed in the wire to ho
A lightning bolt with 20,000A of current in a circular cross section of radius 5mm strikes the ground 1m from where you are standing. What is the size of the magnetic field where you are standing? (
Find the electric field at the remaining (upper right corner).(Assume the +x axis is directed to the right and the +y axis is directed upward.)
Some light rays from a small object sitting on the optical axis of a lens pass through a lens and then all of the rays emerging from the lens travel parallel to the optical axis. What can be said a
To read the text you hold a magnifying glass with focal length f=3cm infront of your eye and place text at the focal point of the lens. What is the angular magnification of the lense?
what is the magnitude of the net electric field at the origin produced by this distribution of charge?
To create a magnetic shield, the idea is similar to that of a toroidal solenoid. Explain the reasoning