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the sled (100kg) rides on a slope, 30 degrees to the horizontal. The coefficient of friction is 0.8. What force (parallel to the slope) up the slope is needed to move the sled up and what force is needed move the sled down? What are your answers if the coefficient of friction is 0.4?
Mark pushes his broken car 150m down the block to his friend's house. He has to exert a 110N force to push the car at a constant speed. How much Thermal Energy is created
The blackbody radiation emitted from a furnace peaks at a wavelength of 2.5 10-6 m (0.0000025 m). What is the temperature inside the furnace
How would you describe why we have different atmospheric pressure on different level (height) of earth's atmosphere in molecular level (molecular behaviour and what causes such behaviour).
A diving bell has a weight of 100000 N when measured on shore. What is the buoyant force, FB, on the diving bell
What is the horizontal distance between elbow and the point where the weight of the forearm acts.
An aquarium contains a 5 - cm layer of water ( n = 1.333) floating on top of carbon tetrachloride ( n = 1.461) what is the angle of refraction into the air
An electric dipole is formed from ±1.0nCcharges spaced 2.00mm apart, What is the electric field strength at the points (x, y) = (14.0 cm , 0 cm),(x, y) = (0 cm, 14.0 cm)
A wave is moving along a string. The equation giving the displacement y of a point at coordinate x and at time t has the form y = 0.2cos(4pi(x)/5-20pi(t)), Calculate the frequency and the speed(m/s) of the wave
A snow mibile is pulling a large sled across a snow-covered field. The weight of the sled is 3560 N. If the coefficient of friction of the sled is 0.12,
A thin, uniformly charged ring of radius a = 10cm carries a total electric charge Q=3.6microCoulombs and rotates with angular speed w = 170rad/s counterclockwise about the z-axis
a projectile is projected from the origin with a velocity of 45.0 m/s at an angle of 30.0 degrees above the horizontal. what is the range of the projectile
A ray of light is incident on a flat mirror at an angle?. If we then rotate the mirror by 10° while keeping the incident ray fixed, by what angle will we rotate the reflected ray
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