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A ruby laser emits an intense pulse of light that lasts a mere 30 ns. The light has a wavelength of 690 nm , and each pulse has an energy of 700 mJ.
A. How many photons are emitted in each pulse?
B. What is the rate of photon emission, in photons per second, during the 30 ns that the laser is "on"?
A sailor strikes the side of his ship just below the surface of the sea. He hears echo of the wave reflected from the ocean floor directly below 9 s later. How deep is the ocean at this point.
A barge is 15.0 m wide and 75.0 m long and has vertical sides. The bottom of the hull is 1.20 m below the water surface. What is the weight of the barge
A Boeing 777-200 airliner with a wingspan of 64.0 m is flying perpendicular to the Earth's magnetic field at its cruising speed of 250 m/s. What potential difference is induced between the plane's wingtips
A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 29.4m/s2. Find the maximum height ymax reached by the rocket
A field mouse trying to escape a hawk runs east for 6.0m , darts southeast for 3.9m, What is the magnitude of the net displacement of the mouse
An 24 g rifle bullet traveling 370 m/s buries itself in a 4.8 kg pendulum hanging on a 2.6 m long string, which makes the pendulum swing upward in an arc. find the maximum vertical displacement of the pendulum.
a 10 kg box is pulled for 3.60 m along a level surface by a rope that makes an angle of 37 degrees above the horizontal. Find the work done by each force on the box
q1. consider a motor that exerts the constant torque of 25.0 n cdot m to a horizontal platform whose moment of inertia
A parallel-plate capacitor is to be constructed by using, as a dielectric, rubber with a dielectric constant of 3.20, What is the minimum area the capacitor plates can have
Jack was exposed to fast neutrons; he received a radiation dose of 220rem rem on part of his hand, affecting 28.0grams of tissue. How much radiation did Jack receive
Water at a gauge pressure of 3.8 atm at street level flows into an office building at a speed of 0.45 m/s through a pipe 4.2 cm in diameter.Calculate the flow velocity in such a pipe on the top floor
During 8.83 seconds a motorcyclist changes his velocity from v1,x = -36.5 m/s and v1,y = 10.5 m/s to v2,x =-23.1 m/s, Find the components of the motorcycle\'s average acceleration
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