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A 40-car train travels along a straight track at 40 mph. A skier speeds up as she skis downhill. On which is the net force greater?
An object, when pushed with a net force F, has an acceleration of 2 m/s2. Now twice the force is applied to an object that has four times the mass. Its acceleration will be. Show work please
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