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Sam, whose mass is 75 kg, straps on his skis and starts down a 50 m high 20° frictionless slope. A strong headwind exerts a horizontal force of 200 N on him as he skies. Use work and energy methods to find Sam's speed at the bottom.
A 57-kg pole vaulter running at 1.1 m/s vaults over the bar. Her speed while she is above the bar is 1.0 m/s. Avoid air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
An 800-N billboard worker stands on a 4.0-m scaffold supported byvertical ropes at each end. what is the tension in the ropenearest the worker
When constructing a roller coaster, the designer wishes the riders to experience weightlessness as they round the top of the hill. Find how fast the car must be going
assume that rayleighs criterion gives the limit of resolution of an astronauts eye looking down on earths surface from
Briefly describe the properties of our planet and explain them. Include the qualities of the Earth's interior and how we learn about it, as well as a description of properties that shape and change the Earth's surface (e.g. volcanism, tectonics, a..
There is a +10 nC charge inside a cube of size 5 cm. What additional charge must be placed into the cube
The speed of light in a particular type of glass is 1.69 108 m/s. What is the index of refraction of the glass
For a short time, the path of the plane is described by If the plane is rising with a constant velocity of 10 m/s, determine the magnitudes of the velocity and acceleration
A lead bullet with a mass of 0.02 kg traveling at 209 m/s strikes an armor plate and comes to a stop. what is the temperature change
A proton accelerates from rest in a uniform electric field of 644 N/C. At some later time, its speed is 1.14 106 m/s. Find the magnitude of the acceleration of the proton
the cube is 20.0 cm on each edge. Four straight segments of wire-ab,bc,cd, andda-form a closed loop that carries a currentI=5.00A in the direction shown, Determine the magnetic force on each segment
A 14292 kg railroad car is rolling at 1.21 m/s when a 3365 kg load of gravel is suddenly dropped in. What is the cars speed just after the gravel is loaded
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