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Engine oil at 200 oC is forced over a 20-cm-square plate at a velocity of 1.2 m/s. The plate is heated to a uniform temperature of 60°C. Calculate the heat lost by the plate
A certain radio station broadcasts at a frequency of 5 MHz with an average power output of 5 kW. (a) What is the energy of a photon in electronvolts? (b) How many photons does the station emit per s
A hydrogen atom is in its tenth excited state according to the Bohr model (n=11). (a) What is the radius of the Bohr orbit? (b) What is the angular momentum of the electron? (c) What is the electron
(a) What is the energy of the incident photon? (b) What is the work function for potassium? (c) What would be the stopping potential if the incident light had a wavelength of 430 nm? (d) What is the
What is the angular separation of two spectral lines of wavelengths 440 nm and 388 nm formed in order m=2 with a 382 line/mm grating? Express the answer in degrees with two decimal places.
A particle with mass m is confined on a line with length L. With uncertainty principle, estimate the minimum energy of the particle.
If a plane wave is reflected from the ocean floor at normal incidence with a level 20 dB below that of the incident wave, what are the possible values of the specific acoustic impedances of the flui
A rock weighing 98 N is thrown downward with a velocity of 20 m/s from the top of a 140 m tall building. What is the velocity of the rock at 120m above the ground?
A parallel plate capacitor has square plates 12 cm on a side separated by 0.10 mm of plastic with a dielectric constant of k=3.1. The plates are conected to a battery causing them to become opposely
A laser beam is traveling through an unknown substance. When it encounters a boundary with air, the angle of reflection is 27.6° and the angle of refraction is 46.0°. (a) What is the index o
Using x-rays of wavelength 0.14 Angstroms, you observe maxima when the reading on the goniometer is 12.5 degrees, 14.6 degrees and 16.7 degrees. What is the spacing between the crystal planes? Note
In her job as a dental hygienist, Kathryn uses a concave mirror to see the back of her patient's teeth. When the mirror is 1.11 cm from a tooth, the image is upright and 3.13 times as large as the t
What are the three longest wavelengths for standing sound waves in a 121-cm-long tube that is (a) open at both ends and (b) open at one end, closed at the other?
A 1000 MW power plant is operated for a year. It has a thermal efficiency of 32% and a utilization factor of 0.8. Assume that only 235U is fissioned to generate the energy. The question now is how m
During test-out procedures, a 239Pu fueled thermal reactor is operated for a time at a power of 1 MW. The power is then to be increased to 100 MW in 8 hrs. A) On what stable period should the reacto
Magnetic resonance imaging needs a magnetic field strength of 1.5 T. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 1.50-mm-diameter superconducting wir
A model airplane with mass 0.740 kg is tethered to the ground by a wire so that it flies in a horizontal circle 30.2 m in radius. The airplane engine provides a net thrust of 0.803 N perpendicular
Two objects attract each other with a gravitational force of magnitude 1.01 x 10-8 N when separated by 19.9 cm. If the total mass of the two objects is 5.07 kg, what is the mass of each?
A sealed container contains 8 moles of radon gas at STP. Estimate the number of radon atoms having speeds in the range from 227.0 m/s and 229.0 m/s. (Hint: Assume the probability of radon atoms havi
An LC circuit consists of a capacitor with C=2.90mF and an inductor with L=30.0mH. At t=0, the capacitor has a charge 6.30mC and the current in the inductor is zero. The circuit oscillates at its re
A capacitor is formed from a hollow copper sphere of inner radius r = 36.3 cm and outer radius R = 45.4 cm. Calculate the capacitance of the sphere in microfarads.
A very thin circular disk of radius R = 17.00 cm has charge Q = 10.00 mC uniformly distributed on its surface. The disk rotates with a constant angular velocity 7.00 rad/s around the z axis through
Two solenoids are nested coaxially such that their magnetic fields point in opposite directions. Treat the solenoids as ideal. The outer one has a radius of 20 mm, and the radius of the inner soleno
What is the maximum distance between the wall and the sound source for the time difference between direct and first reflected sound to be less than 20 ms?
How would the positions of the maxima and minima change if this experiment were done under water? Justify your answer.