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A 15 centimeter ruler is placed 30 centimeter in front of a concave mirror with a focal length of 20 centimeter. Find where is the image located and how big is it?
After solving a difficult physics problem, an excited student throws his book straight up. How much time does it take until the book hits the floor
A diffraction grating with 750 slits/mm is illuminated by light that gives a first order diffraction angle of 34 degrees. What is the wavelength of the light
A 68 kg diver steps off a 12 m tower and drops from rest straight down intothe water. If he comes to rest 4.0 mbeneath the surface, determine the average resistance force exertedon him by the water.
The figure below shows a 6.2 kg rod of 1.00 m in length, hinged to a vertical wall and supported by a thin wire. The wire and rod each make angles of 45° with the vertical. When a 10.0 kg block is suspended from the midpoint of the rod, the tension T..
Alpha Centauri, a star close to our solar system, is about 4.3 light years away. Suppose a spaceship traveled this distance at a constant speed of .90c relative to Earth. What is the trip distance according to the traveler
A disk, initially rotating at 149 rad/s, is slowed down with a constant angular acceleration of magnitude 4.23 rad/s2. (a) Explain by how much time does the disk take to stop? (b) Through what angle (rad) does the disk rotate during that time?
Earth's perihelion passed about nine hours ago. How precisely do we know the moment of closest approach of the Earth to the center of the sun? How do we make this measurement?
A crate of mass 9.4 kg is pulled up a rough incline with an initial speed of 1.46 m/s. The pulling force is 94 N parallel to the incline, which makes an angle of 20.2° with the horizontal. The coefficient of kinetic friction is 0.400, and the crat..
Sometimes mirages are formed when light reflects from of a warm layer of air near a hot surface (like a road). what is the index of refraction of the hot air
a 100 MeV particle decays into two particles. one of these two particles has a mass of 10 MeV and a speed of 3/5. a) what are the mass and speed (in the initial particle rest frame) of the second particle
A support strap is attached to the patient's ankle 13.0 from the bottom of his foot. Illustrate what weight is needed to support the leg horizontally?
in 1992 an ice palace estimated to be 4.90 x 106 kg was built in minnesota. despite this sizable mass this structure
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