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In a hydrogen atom, the electron makes a transition from the n = 7 to the n = 2 state. What is the wavelength of the emitted photon?
a ship's horn can be heard above typical background noise if at intensity level 20 dB. what must be the power of the horn's output to achive this level at 5.0 km away
A system has a heat source supplying heat at a rate of 187 W, At what rate is the internal energy of the system changing
A jet flying at 136 m/s banks to make a horizontal circular turn. Calculate the magnitude of the necessary lifting force
A stunt man whose mass is 70 kg swings from the end of a 4.40-m long rope along the arc of a vertical circle. Assuming that he starts from rest as rope is horizontal, find out the tensions in the rope that are required to make him follow his circu..
A playground merry-go-round is a disk of radius 4.0 m and mass 5,0 x 102 kg, initially stationary. what is the resulting angular velocity
W hat is the ratio of an amplitude of the damped oscillations
he potential difference between two parallel conducting plates in vacuum is 410 V. What is the kinetic energy of the alpha particle
A fly sits on a potter's wheel .30 m from its axle. The wheel's rotational speed decreases from 4.0 rad/s to 2.0 rad/s in 5.0 s. Determine the wheel's average rotational acceleration
A motorcycle starts with a constant acceleration of 3.0 m/s^2. At just that instant a buick with a constant speed of 20 m/s passes the motorcycle, How fast is the motorcycle travelling when it overtakes the buick
An aluminum wire has a length of 20m and adiameter of 0.0025in. It is connected to a 9.35V battery. The resistivity of aluminium is 2.65x10^-8(ohm(m))a).
You are driving to the grocery store at 20. You are 100 from an intersection when the traffic light turns red. Suppose that your reaction time is 0.70 and that your car brakes with constant acceleration. What acceleration would bring you to rest r..
Consider a commemorative quarter-dollar advertised for sale at $4.98. It has a diameter of 24.3 mm, a thickness of 1.78 mm, and is completely covered with a layer of pure gold 0.149 µm thick.
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