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A hydrogen atom emits a photon of energy 3.4 eV. If the atom is at rest before emitting the photon, find what is the speed of the atom after emission?
A 3.7 kg block of copper at a temperature of 86°C is dropped into a bucket containing a mixture of ice and water whose total mass is 1.2 kg. How much ice was in the bucket before the copper block was placed in it
A slide projector desires to create a 98 centimeter high image of a 2 centimeter tall slide. Find how far should you place the lens from the slide
an organ pipe is 2.0cm long.Assume the pipe is cylindrical with one closed and one open end. if the frequency of the 3rd harmonic is 290Hz,then what is the speed of sound in the pipe
A teenager pushes tangentially on a small hand-driven merry-go-round and is able to accelerate it from rest to a frequency of 15 rpm in 10.0 s. Calculate the torque required to produce the acceleration
A charge of +378 C is fixed at the center of a square that is 0.64 m on a side. How much work is done by the electric force as a charge of +1.8 C is moved from one corner of the square to any other empty corner?
suppose that you are climbing a hill whose shape is given by the equation z 1000 - 0.01x2 - 0.02y2 and you are
Mercury flows through a horizontal pipe 0.80 cm in diameter and 0.5 m long. what is the rate of flow through the tube
question the x y and z components of a magnetic field are bx 0.12 t by 0.14 t and bz 0.17 t. a 25 cm wire is
An object's temperature increases, and in so doing its radiation power increases by a factor of 2.00.find the ratio of the new temperature to the original temperature
Two lenses are placed 30 cm apart. The first lens has a focal length of +20 cm, and the second lens has a focal length of -10cm. If an object is placed 100 cm in front of the first lens, where is the final image located? Give your answer in relation ..
A motorcyclist is traveling along a road and accelerates for 4.50s to pass another cyclist. The angular acceleration of each wheelis +6.70 rad/s^2, and, just after passing, the angular velocity ofeach is +74.5 rad/s, where the plus signs indicate ..
The flowers of the bunchberry plant open with astonishing force and speed, causing the pollen grains to be ejected out of the flower in a mere 0.30 ms at an acceleration of 2.5×104 m/s2. Evaluate with what speed are pollen grains ejected from a b..
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