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A car of mass m starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude P. The instantaneous velocity of this car is proportional to
(1)t^2P(2)t^1/2(3)t^-1/2(4)t/m^1/2
In the bohr model of the hydrogen atom, the speed of the electron is approximately 2.01 E 106 m/s. Find the central force acting on the electron
Near the surface of the Earth a small object of mass m = 0.5 kg, on the end of a light cord, is held at an angle of 45 degrees from the horizontal and a distance R from a fixed support The object is then released from rest.
Electrons are ejected from a metallic surface with speeds ranging up to 4.60 × 105 m/s when light with a wavelength of 625 nm is used. What is the cutoff frequency for this surface
The time constant of an RC circuit is 2.6s. How much time (t) is required for the capacitor (uncharged initially) to gain one-half of its full equilibrium charge?
A lens with an index of refraction of 1.60 is to be coated with a material (n = 1.39) that will make the lens nonreflecting for yellow-orange light (? = 515 nm) normally incident on the lens
The coefficients of kinetic and static friction between a 1000 lb refrigerator and flor are .4 and .45. when at rest the refrigerator is pushed with a horizontal force of 300 lb. what is the force of friction between the fridge and the floor?
The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons). What is the force between the two alpha particles when th..
A force in the +x-direction with magnitude F(x) = 18.0 N - (0.530 N/m) x is applied to a 6.00-kg box that is sitting on a frictionless surface. what is its speed after it has traveled
a fireman 48.0 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of
When a converging lens is utilized in a camera (as in the top figure), the film should be at a distance of 0.210 m from the lens to record an image of an object that is 4.00 m from the lens.
There is a second sphere identical to the first, except that its center is hollowed out so that it is empty from r = 0 to r = 10 cm. Find the electric field everywhere outside of this sphere
calculate the frictional force needed for a 900 kg car traveling around a 500 m radius curve at 25 ms if the car is to
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