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If = 533, what is the minimum diameter of the circular opening from which the laser beam emerges? The earth-moon distance is 3.84×105.
Scientists use laser range-finding to measure the distance to the moon with great accuracy. A brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. A laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. In order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1 in diameter. Staying within this diameter is accomplished by using a special large-diameter laser.
A child pulls a friend in a little red wagon with constant speed. If the child pulls with a force of 16 N for 10.0 m, how much work does the child do on the wagon
A 17.0 m-long copper wire, 2.10 mm in diameter including insulation, is tightly wrapped in a single layer with adjacent coils touching, What is the length of the solenoid
A family ice show is held at an enclosed arena. The skaters perform to music with level 85.0 dB. What is the combined sound level
The Sun is a low mass star and so would never have the core fusion reactions of massive stars. Yet, the Sun has iron in its atmosphere, as well as gold, silver and other elements much heavier than iron and why?
q. two perpendicular long straight wires both of which lie in the plane of the paper. the current in each of the wires
Suppose that a 1.00 cm3 box in the shape of a cube is perfectly evacuated, except for a single particle of mass 1.15 10-3 g. Find the mass density inside the box
Suppose a ship heads directly north away from the docks in a harbor at a speed of 5.00 km/h. what is the Distance from dock
At the top of Earth's atmosphere, sunlight has an average intensity of 1380W/m^2 .If the average distance from Earth to the Sun is 1.5*10^11m, at what rate does the Sun radiate energy?
A smooth glass plate of refractive index 1.50 is coated with a smooth thin film of thickness 360 nm and refractive index 1.30. Light in air is incident on the film at normal incidence. Find the wavelengths in the visible region (400 - 700 nm) that un..
A 54 {rm kg} ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.5 turns each second. The distance from one hand to other is 1.5 {rm m}. Biometric measurements indicate that each hand typically..
A fan blade rotates with angular velocity given by ?z(t)= ? ? ? t2, where ? = 5.45rad/s and? = 0.835 rad/s3. Calculate the angular acceleration as a function of time
To start a mower, a person must pull on a string attached to a pulley with a force of 70N. The pulley is a disc of mass 0.1kg and radius 0.1m. Calculate the angular acceleration of the pulley
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