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Using a grating with a spacing of 0.00046 cm, a line (which looks like red light) appears 27 cm from the central line on a screen. The screen is 1.9 m from the grating. What is the wavelength of the light? Answer in units of nm
An eagle is flying horizontally at 6.7 m/s with a fish in its claws. It accidentally drops the fish. How much time passes before the fish's speed doubles
An electric motor rotating a workshop grinding wheel at the rate of 106 rev/min is switched off. Assume the wheel has a stable negative angular acceleration of magnitude 1.50 rad/s2.
A small 12.5g plastic ball is tied to a very light 27.8cm string that is attached to the vertical wall of a room. Find the magnitude of the electric field in the room
A group of hikers hear an echo 2.50 s after they shout. If the temperature is 28°C, how far away is the mountain that reflected the sound wave.
What is the kinetic energy
A 22.5-mW laser beam of diameter 1.98 mm is reflected at normal incidence by a perfectly reflecting mirror. Calculate the radiation pressure on the mirror
A projectile is fired in such a way that its horizontal range is equal to 14 times its maximum height. What is the angle of projection
A merry-go-round starts from rest and reaches the angular speed of 4 rpm in the first two minutes. What would be the angular acceleration of the merry-go-round in rpm/min
An electric water heater holds 165L. If electricity costs 0.18 per , how much does it cost to raise the water temperature from 10 to 60.
A skydiver jumps out of a plane and fall 7.7 seconds before opening the parachute. What is the sky diver's speed when parachute opens
A 0.302-m-thick sheet of ice covers a lake. The air temperature at the ice surface is -16.0 °C. In 5.90 minutes, the ice thickens by a small amount. Calculate the number of millimeters by which the ice thickens
The terminals of a generator are connected to inductors. Inductor 1 is equal to 30.0 mH and the second inductor has a value of 60.0 mH. What is the value of the third inductor
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