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An "extreme" pogo stick utilizes a spring whose uncompressed length is 34 cm and whose force constant is 1.2×104 N/m. A 59-kg enthusiast is jumping on the pogo stick, compressing the spring to a length of only 5.0 cm at the bottom of her jump. Calculate the net upward force on her at the moment the spring reaches its greatest compression. Calculate her upward acceleration, in g's at that moment.
The energy of the first excited state of a hydrogen atom is -0.34eV +/- 0.0004eV. What is the minimum average lifetime for this state
A 4-kg ball traveling to the right with a speed of 4 m/s collides witha 5-kg ball traveling to the left with a speed of 2 m/s. What is the total momentum of the two balls before they collide
An electron has an initial velocity of +2.00 x 104 m/s. It enters a region of space where it experiences an acceleration of +1.50 x 104 m/s2 over a distance of 1.00 centimeter. What size force is exerted on the electron
A space station is to provide artificial gravity to support long-term stay of astronauts and cosmonauts. It is designed as a large wheel, with all the compartments in the rim, how long should the motor fire
Electric charge can accumulate on an airplane in flight. You may have observed needle-shaped metal extensions on the wing tips and tail of an airplane, What is the electric field at the surface of each sphere
A 180, 48.0 cm-diameter turntables rotate on frictionless bearings at 70.0. A 15.0 block sits at the center of turntable. A compressed spring shoots the block fundamentally outward along the frictionless groove in the surface of the turntable.
A dolphin wants to swim directly back to its home bay, which is 0.760 km due west. It can swim at a speed of 4.23 m/s relative to the water, What direction should the dolphin head
A 100 ball on a 60 long string is swung in a vertical circle whose center is 200 above the floor. The string suddenly breaks when it is parallel to the ground and the ball is moving upward. The ball reaches a height 600 above the floor.What is the..
After a shipwreck, a solid steel spoon lies at the bottom of the ocean, 8.00km below the surface. Find the fractional volume change in the spoon due to compression forces
A 82-kg fisherman in a 114-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of vi = 4.6 m/s, find the velocity of the boat after the package is thrown
In the Compton effect, an X-ray photon of wavelength 0.31 nm is incident on a stationary electron. What is the wavelength of the scattered photon
A person swimming underwater sees a lifeguard who is standing in the shallow part of the pool; the water comes up to the lifeguard's waist. In what way does the swimmer see lifeguard's upper body distorted.
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