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Two hydrogen atoms, both initially in the ground state, undergo ahead-on collision. If both atoms are to be excited to the n= 9 level in this collision, what is the minimum speed each atom can have before the collision?
A 500 kg polar bear of average density 950 kg/m3 is stranded on a melting chunk of ice in the ocean. What is the smallest volume of ice that will keep the bear entirely above water
A 20-kg rotating disk of radius 0.30m has an angular momentum of 0.40kg?m2/s. What is the angular speed of the disk
Two atoms of masses m1 and m2 are bound together in a molecule with energy so low that their separation is always close to the equilibrium value r0. With the parabola apporximation, the effective spring constant is k = (d2U)/(dr2) evaluated at r0
The electric field of a charge is 1.69e+07 N/C at a distance 14.1 cm and points away from the charge. What is the sign and magnitude of the charge
A stable and highly soluble pollutant is dumped into a lake at the rate of 0.19 tonnes per day. The lake volume is 2E7 m3 and the average water flow-through rate is 8E4 m3 per day
One solenoid is centered inside another. The outer one has a length of 54.0 cm and contains 6800 coils, What is the mutual inductance of these solenoids
A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. What is the frictional force on the box
You push with a horizontal force of 50.0N against a 24.0N box, pressing it against a rough wall to hold it in place. what is the friction force of the box
Two equal point charges of magnitude 4.0 ?C are situated along the x-axis at x1 = -2.0 m and x2 = -2.0 m. What is the electric potential energy of this system of charges
Draw a picture of a moving source and the waves surrounding it according to what you observed in this experiment. How does the spacing of the wavefronts in front of the source compare to those behind it?
An object is placed 100 cm in front of a diverging lens of focal length -25 cm. A converging lens of focal length 33 1/3 cm is placed 30 cm past the first lens. What is the lateral magnification of this system of lenses? Show work for full credit.
a tennis ball is thrown from ground level with velocity vo directed 30 degree above the horizontal. if it takes the
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