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The zygomatic bone in the upper part of the cheek can be fractured by a 900-N force lasting 6.0 ms or longer. A hockey puck can easily exert such a force when hitting an unprotected face. A0 what change in velocity of a .17-kg hockey puck is needed to provide that impulsive force? What assumptions did you make? B0A padded face-mask double the stopping time. By how much does it change the force on the face? Explain.
Levitation by Light Pressure. Consider an isolated hydrogen atom of mass 1.66 x10^- 27 kg. Find the number of photons that must strike the atom per second, and the corresponding and optical power, for it not to fall under the effect of gravity, gi..
The electric field midway between two equal but opposite point charges is 939N/, What is the direction of the electric field, Calculate the magnitude of the electric field
While exercising, the following physiological changes occur for a certain person. His systolic pressure increases by 46 %. Which change has the strongest effect on blood flow
An Olympic long jumper is capable of jumping 8.5m .Assuming his horizontal speed is 9.5m/s as he leaves the ground, How high does he go
A standing wave is set up by reflecting radio waves from a large, flat metal dish. What is the frequency of the radio waves
The Earth has a surface temperature around 270 K and an emissivity of 0.8, while space has a temperature of around 2 K. What is the net power radiated from our Earth into free space in Watt W
The energy required to dissociate 1 mol of O2 to form 2 mole oxygen is 118kcal. find the wavelength of the photon
A 3.10-m-long, 340kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction
Given two parallel plate capacitors 1 and 2. They both have a plate-charge Q and plate area A. Determine the ratio of the polarized charge q1/q2
An automobile starter motor has an equivalent resistance of 0.0470 and is supplied by a 12.0 V battery with a 0.0120 internal resistance. What is the current to the motor
A tennis player, when performing a serve, applies an average force to a tennis ball of 525 N to a 55 g ball. What is the speed of the ball as it leaves the racket
You are traveling on a hilly road. At a particular spot, when your car is perfectly horizontal, What is the radius of the circular arc in meters
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