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Light from the sun arrives at the earth at the rate of about 1400 W/m^2 of area perpendicular to the direction of the light. Assuming that sunlight consists exclusively of light of wavelength 6x10^-7 m, find the number of photons per second that fall on each square meter of the earth's surface directly facing the sun.
Determine the smallest thickness of the shaft if the allowable shear stress is ?allow=150MPa and the shaft is restricted not to twist more than 0.08rad
To throw the discus, the thrower holds it with a fully outstretched arm. Starting from rest, he begins to turn with a constant angular acceleration, what will be the speed of the discus at release
A 0.7 kW heater is designed to operate at 210 V. Assume that its resistance is constant. What is the power dissipated in this resistor if it operates at 120 V
A fisherman's scale stretches 4.0cm when a 2.3kg fish hangs from it. What is the spring stiffness constant
An ac generator with a frequency of 1.54kHz and an rms voltage of 22.2V is connected in series with a 1.90k, What is the power factor for this circuit
question1two geological field teams are working in a remote area. a global positioning system gps tracker at their base
The pilot of an airplane executes a loop-the-loop maneuver in a vertical circle. What is the pilot's apparent weight at the lowest point if his true weight is 160 lb
The wheels, axle, and handles of a wheelbarrow weigh W = 68 N. The load chamber and its contents weigh WL = 605 N. Find the magnitude of the man's force for both designs
A rocket with a mass of 2.9×10^6 kg has a relativistic kinetic energy of 2.5×10^23 J. How fast is the rocket moving
An ice-cube tray of negligible mass contains 0.350 kg of water at 18.0°C. How much heat must be removed to cool the water
Model the electromagnetic wave in a microwave oven as a plane traveling wave moving to the left, with an intensity of 26.3 kW/m2. An oven contains two cubical containers of small mass, each full of water.
A rifle is aimed horizontally at a target 47.0 away. The bullet hits the target 1.80 below the aim point. Evaluate the bullet's flight time? What was the bullet's speed as it left the barrel?
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