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A laser emits a narrow beam of light. The radius of the beam is 1.5 mm, and the power is 2.9 mW. What is the intensity of the laser beam?
Consider a 1-D NaBr lattice. The frequency at the optical mode at k=pi/a is f=10.1THz. find the frequency for the optical mode at band center (k=0)
What is the minimal mass of helium (density 0.18) needed to lift a balloon carrying two people in a basket, if the total mass of people, basket, and balloon (but not gas) is 320.
A rock is thrown downward into a well that is 8.90 deep. If the splash is heard 1.20 seconds later, what was the initial speed of the rock? Take the speed of sound in the air to be 343 m/s.
question1the pilot of the aircraft wishes to fly due west in a 48.5 kmh wind blowing toward the south. the speed of an
A 1.6kg chicken is blown into a wall by a strong gust of wind, Which direction is the frictional force
A rectangular fish tank measures 20 cm by 60 cm by 40 cm high. The tank is filled with water to a depth of 37 cm. What is the pressure at the bottom due to the water
q1. a 10.4-kg cylinder rolls without slipping on a rough surface. at an instant while its center of gravity has a speed
A car traveling at 93km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.75 m. What was average acceleration of the driver during the collision? Express the answer in terms of "g's," where 1.00g ..
q1. a 10000 kg railroad car is rolling at 2 ms when a 400 kg load of gravel is suddenly dumped in. what is the railroad
A sample of an ideal gas is at a temperature of 300 K. The rms molecular speed at this temperature is measured as 1368 m/s. Calculate the mass of a molecule of this gas
A soccer ball lying on the ground is kicked with an initial velocity of 10.0 m/s at an angle of 37 degrees above the horizontal
A 73 trampoline artist jumps vertically upward from the top of a platform with a speed of 4.0. If the trampoline behaves like a spring of spring constant 6.2×104, how far does he depress it.
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