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In Rutherfords famous scattering experiments thats led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 x 10 ^-27 kg) were fired torward a gold nucleus with charge +79e. An alpha particle, initially very far from the gold nucleus, is fired at 1.8e7 m/s directly toward the nucleus, as in the figure below. How close does the alpha particle get to the gold nucleus before turning around? Assume the gold nucleus remins stationary.
_______m
A starship voyages to a distant planet 10 ly away. The explorers stay 4.00yr , return at the same speed, What is the speed of the starship
When an 81.0 kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.10 x 10^3 J. By how much does the potential energy of a(n) 20 kg child increase when the child climbs a norma..
A box-shaped wood stove has dimensions of 0.75 m x 1.2 m x 0.40 m an emissivity of 0.80, Calculate its rate of radiation into the surrounding space
Suppose you have to move a heavy crate of weight 875 N by sliding it along a horizontal concrete floor. What is the magnitude Fp of the minimum force you need to exert on the crate to make it start sliding along the floor
On a spacecraft, two engines are turned on for 730 s at a moment when the velocity of the craft has x and y components of velocity v0x = 4040 m/s, Find the x and y components of the craft's acceleration
A 0.500m -diameter vat of liquid is 2.20m deep. The pressure at the bottom of the vat is 1.30atm. What is the mass of the liquid in the vat
How much work is done on the car by the engine when accelerating the car from rest to 90m/s, What is the average power delivered by the engine
A swimmer heads directly across a river, swimming at 1.60 m/s relative to the water. She arrives at a point 58.0 m downstream from the point directly across river, 63 m wide. What is the speed of the river current.
Calculate the induced emf in the conductor and if the total resistance in the conductor is R what is the magnitude of the induced current.
What is the maximum speed with which a 1200 kg car can round a turn of radius 60.0m on a flat road if the coefficient of friction between tires and road is 0.65.
A wrecking ball (weight = 5010 N) is supported by a boom, which may be assumed to be uniform and has a weight of 3670 N. As the drawing shows, a support cable runs from the top of the boom to the tractor.
Two forces are acting on a 9.5 kg box on a frictionless surface. Force A has a magnitude of 44 N, Find the magnitude of the acceleration of the box
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