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A girl is sledding down a slope that is inclined at 30º with respect to the horizontal. The wind is aiding the motion by providing a steady force of 184 N that is parallel to the motion of the sled. The combined mass of the girl and the sled is 56.0 kg, and the coefficient of kinetic friction between the snow and the runners of the sled is 0.106. How much time is required for the sled to travel down a 107-m slope, starting from rest?
Over a time interval of 2.16 years, the velocity of a planet orbiting a distant star reverses direction, Find the total change in the planet's velocity in m/s
Two cars approaching each other collide and stick together after the collision. One car has a mass of 1820 kg and a speed of 30 km/h in the positive x direction. find the initial velocity of the second car
A 500? resistor and a 240mH inductor are connected in series with an ac generator with an rms voltage of 17.0V, compute the rms current in this circuit
A truck covers 40.0 m in 8.15 s while smoothly slowing down to a final velocity of 3.15 m/s. Find the truck's original speed. Find its acceleration.
A person with a near-point distance of 25 cm finds that a magnifying glass gives an angular magnification that is 1.5 times larger, What is the focal length of the magnifying glass
A 44.7-kilogram object is pulled 7.5 meters along a horizontal surface with a 130-Newton force at 28o above horizontal. What is the net work done on the object
Besides the gravitational force, a 3.05-kg object is subjected to one other constant force. Determine the other force
0.45 kg of a metal at 90degreesC is added to 0.40 kg of whater at 20.0degreesC. If the final temp of the mixture is 26.0degreesC, what is the specific heat of the metal
What is the maximum number of lines per centimeter a diffraction grating can have and produce a complete first-order spectrum for visible light
Recalling that an object smaller than the wavelength illuminating it cannot be "seen", what is the minimum kinetic energy of electrons needed in an electron microscope in order to "see" an atoms whose diameter is 0.1 nm, about the size of a silicon a..
A 5.10 kg object on a horizontal frictionless surface is attatched to a spring with spring constant 880 N/m. The object is displaced from equilibrium 50.0 cm horizontally and given an initial velocity of 8.9 m/s back toward the equilibrium point.
You drape a string over a pulley and hang a mass of 35kg from one end. You tie the other end to a point a distance L from the pulley so that the string is horizontal between this point and the pulley.
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