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Q. An extreme skier, starting from rest, coasts down a mountain that makes an angle of 24.6 ° with the horizontal. The coefficient of kinetic friction between her skis and the snow is 0.119. She coasts for a distance of 17.8 m before coming to the edge of a cliff. Without slowing down, she skis off the cliff and lands downhill at a point whose vertical distance is 4.15 m below the edge. How fast is she going just before she lands?
make use of the force equation of equilibrium with torques to compute around the second pivot pt, fine the women's position when the beam is about to tip.
A package is dropped from a passing plane (moving in the horizantal direction) and produces a projectile motion as it is falling to the ground. If it takes the package only 32.12 seconds until it hits the ground, how far above the ground was the plan..
An object is 22 cm in front of a diverging lens that has a focal length of -13 cm. How long in front of the lens should the object be placed so that size of its image is reduced by a factor of 4.
A 23 kg boom of length 6 m is supported by a cable that has a breaking tension of 1200N. The cable is perpendicular to the boom and is attached 4.5m from the pivot. What is the utmost load that can be suspended from the end of the boom.
What average force athletes legs apply on a ground
On a cello, the string with the largest linear density (1.54 10-2 kg/m) is C string. This string produces a fundamental frequency of 63.4 Hz and has the length of 0.795 m between the two fixed ends. Find tension in the string.
The basic concepts in optics.
A 4.86 g bullet moving with an initial speed of vi = 439 m/s is fired into and passes through a 1.06 kg block. The block, initially at rest on a frictionless horizontal surface, is connected to a spring with the spring constant of 832 N/m.
If the beam now strikes the top of a building standing directly at the water's edge, find out the height of the building.
Suppose an initial speed of 21.4 m/s, at an angle of 61.10° with respect to the positive x axis. Find the velocity at time t0; enter x component, after that the y component.
What is the minimal mass of helium (density 0.18) needed to lift a balloon carrying two people in a basket, if the total mass of people, basket, and balloon (but not gas) is 320.
Every day our Earth receives 1.55×1022 J energy from the Sun. If we were able to use 0.85 percent of this energy to accelerate spaceships, then how various missions will be possible in one year.
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