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A submerged scuba diver looks up towards the calm surface of a freshwater lake and notes that the sun appears to be 35 degrees from the vertical. The diver's friend is standing on the shore of the lake. At what angle above the horizon does the friend see the sun?
If the coefficient of volume expansion of mercury is 18x10(^-5) (K^-1), what is the coefficient of volume expansion in the glass?
The half life for the alpha decay of uranium 238 is 4.47x10^9 yrs old. Determine the age (in years) of the rock specimen that contains 60% of its original number of Uranium 238 atoms.
A charge +q is located at the origin, while an identicalcharge is located on the x axis at x = +0.643 m.A third charge of +2 q is located on the x axisat such a place that the net electrostatic force on the charge atthe origin doubles, its directi..
Find the thermal efficiency and the specific work of a simple Rankine cycle if the maxium temperature and pressure are 1050oC and 5.0 MPa and the minimum pressure is 20 kPa.
A uniform magnetic field points north; its magnitude is 4.8 T. A proton with kinetic energy 7.5 10-13 J is moving vertically downward in this field. What is the magnetic force acting on it
A ball of mass 5.0 kg is lifted off the floor a distance of 1.7 m. What is the velocity of ball just before it hits the floor
Two thermal reservoirs ("hot", TH = 124°C and "cold", TC = 10.0°C) are put into thermal contact by a lead slab. Find the initial rate of heat conduction for each reservoir
A light wave in air is incident on a water surface, (a) At what angle of incidence are the reflected and refracted waves at right angles to each other? What is the reflectivlty of the water for normal incidence? (c) At what angle of incidence is this..
A 54.00 kg pole vaulter running at 10 m/s vaults over the bar. Her speed while she is above the bar is 1.0 m/s. Avoid air resistance, in addition to any energy absorbed by the pole, and determine her altitude as she crosses the bar.
A pulsed laser emits light at a wavelength of 480.7 nm. The pulse duration is 12.1 ps and the energy per pulse is 0.190 J. What is the length of the pulse
a lan uses 1500 m fiber with a loss of 2.0 dbkm. there are 10 connector pairs with a loss of 0.75 db each. if the power
A physician is making an image with ultrasound of initial intensity 2000 W/m^2. What will be the intensity at this depth if the physician changes the frequency to 5.0 MHz
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