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A 30g dart is shot straight up at 10 m/s . At the same instant, a 21g ball of cork is dropped from 2.8m above the dart.
What is the speed of the cork ball immediately after it is hit by the dart? Assume the collision is exactly head-on and the dart sticks in the cork.
An electron in the n = 6 state of a hydrogen atom makes a transition to the n = 3, What is the wavelength of the photon emitted
What is the magnitude of an electric field in which the electric force on a proton is equal in magnitude to its weight, What must the charge (sign and magnitude) of a particle of mass 1.40g
Two balls , one of gold with a mass of 100 kg and one of wood with a mass if 1 kg, are suspended 1 meter apart. find attractive force the wooden ball acting on the gold ball
A 6.4 cm diameter pipe gradually narrows to 4.0 cm. When water flows through this pipe at a certain rate, What is the volume rate of flow
A cat rides a merry-go-round while turning with uniform circular motion. At time t1 = 2.00 s, the cat's velocity is v1 = (5.50) i + (4.00 m/s) j, What is the magnitude of the cat's centripetal acceleration
A meterstick (L = 1 m) has a mass of m = 0.121 kg. Initially it hangs from two short strings: one at the 25 cm mark and one at the 75 cm mark. What is the tension in the left string?
If the rope tension is 120 N, and if the rope does 2500 J of work on the box, what angle theta does the rope make with the horizontal
A window air conditioner uses 1392 W of electricity and has a coefficient of performance of 2.47. How much work will be done by the air conditioner during the process of cooling the room
A capacitor should have charge of magnitude 4.5 microC on each plate, and an electric field of 2.0 kV/mm between the plates
If a projectile is launched vertically from the Earth with a speed equal to the escape speed, how far from the Earth's center is it
Two converging lenses, each of focal length 14.9 cm, are placed 39.6 cm apart, define Where is the final image formed
A luge and its rider, with a total mass of 104 kg, emerges from a downhill track onto a horizontal straight track with the initial speed of 53 m/s. suppose they stop with the constant deceleration of 2.30 m/s2.
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