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A 76 kg skier starts from rest at the top of a ski slope 48 meters high, if the frictional forces do –14.6 kJ of wok on her as she descends, once at the bottom the skier is moving horizontally and comes across a patch of soft snow, where the coefficient of kinetic friction is 0.11. If the patch is 78 meters wide and the average force of air resistance on the skier is 179 newtons, how fast is she going after crossing the patch? (Note you must have first found the skier speed at the bottom of the hill in order to do this part.) Give your answer in m/s to the first decimal place.
Explain by how much upward force does each support exert on the beam? (Enter your answer for support 1 first, followed by your answer for support 2.)
An oil drop whose mass is determined to be 3.3x10^-15 is held at rest between two large plates separated by 1cm while the potential difference between them is 340 V. How numerous excess electrons does this have here.
The 200 g head of a golf club moves at 40 m/s in a circular ARC of 1.2 m radius. How much force must the player exert on the handle of the club to prevent it from flying out of her hands at the bottom of swing? Ignore the mass of the club's shaft.
Assume, instead, that the observer had been moving away from Earth with a speed of 0.80c. How much time would observer have measured for the car to be filled in this case.
If the initial temperature of the horseshoe is 600?C, and initial temperature of the water is 40?C, what is the equilibrium temperature of the system? Suppose no heat is exchanged with the surroundings.
Two people, A and B, with masses of 50-kg and 60-kg, correspondingly, stand on a frictionless surface 10m apart. B pulls on a connecting rope, giving A an acceleration of 0.92m/s2 towards B. a) what is B's acceleration toward A.
A newly discovered planet has twice mass of the earth, but the acceleration because of gravity on the new planet's surface is exactly the same as the acceleration due to gravity on the earth's surface. What is the radius Rp of the new planet in te..
What is the amount of the normal force on the charge on the surface in Newtons, when including both the weight of the object and the electric force on it?
Consider a tungsten filament in a light bulb. After the bulb has been on for an hour, how has the resistance in filament changed (if at all).
What is horizontal distance from press box to second base
An initially motionless test car is accelerated uniformly to 145 km/h in 8.28 seconds before striking a simulated deer. The car is in contact with the faux fawn for 0.455 seconds, after which the car is measured to be traveling at 60.0 km/h.
NASA sends a satellite to another planet by placing the satellite in a Keplerian orbit (around the sun) such that the perihelion is at the radius of the Earth's orbit (1 AU) and the aphelion is at the radius of the planet's orbit. Most of the trip is..
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