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A light ray can change direction when going from one material into another. This phenomenon is known as...
A star has an apparent magnitude of -1.5 and an absolute magnitude of 1.4 (giving it an m-M value of -2.9). If the value of the extinction towards the star Av is on the order of 0.5 magnitudes, what
A 10-cm-diameter parallel-plate capacitor has a 1.0 mm spacing. The electric field between the plates is increasing at the rate 1.3 106 V/(m · s). What is the magnetic field strength at the
A particle is trapped in an infinite square well in the first excited state . A) what is the wavefunction of the particle
A muon and an antimuon are moving in opposite directions with velocities of -0.6 c and 0.6 c, respectively. When they collide, they can annihilate each other and turn into two photons. Both muon and
Consider a Hydrogen atom with the electron in the n = 6 shell. What is the energy of this system? (The magnitude of the ground state energy of the Hydrogen atom is 13.6 eV.) How many subshells are i
Given that one solar mass is 2.0×1030 kg, what would be the radius of a Black Hole containing this amount of mass? (Just an interesting note: the average radius of the orbit of Mercury from th
An atom is ionized so that it has only one electron. When the electron drops from the n = 4 shell to the n = 1 shell, an X-ray of wavelength 243.14 pm is emitted. What is the atomic number?
A sound level meter located 8.92m from the explosion records a level of 110.dB during a time interval equal to the duration of the explosion. How long did the explosion last?
Tennis balls, to be acceptable for tournament play, must have a mass of 57.5 g. When dropped from a height of 2.5 m onto a concrete surface, a ball must rebound to a height of 1.4 m. During impact,
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?