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Block B in the figure below rests on a surface for which the static and kinetic coefficients of friction are 0.56 and 0.33, respectively. The ropes are massless. What is the maximum mass of block A for which the system is in equilibrium?
A chest x ray uses 10 keV photons with an RBE of 0.85. A 60 kg person receives a 0.30 mSv dose from one chest x ray that exposes 25% of the patient's body. How many x ray photons are absorbed in the patient's body
Assume an inductor is contracted of copper wire of length 50m that has a cross-sectional area of 7 x 10-2m2 . (Copper has a resistivity of 2 x10-8 Ω.m ) What is the resistance of this inductor?
A boat is tied to a dock by four ropes. Two ropes, with a tension of 55 N each, are at right angles to the dock. What is the magnitude of the sum of these forces
how close can two protons get is one is at rest and the other has a kinetic energy equal to the average energy at t107
An electron follows a helical path in a uniform magnetic field of magnitude 0.642 T. What is the electron's speed
Assume that if the shear stress in steel exceeds about 4.00 108 N/m2, the steel ruptures. (a) Determine the shearing force necessary to shear a steel bolt 1.20 cm in diameter. N (b) Determine the shearing force necessary to punch a 1.75-cm-diameter h..
A particle with a charge of -9 x 10-6C and a mass of 13 g moves uniformly with a speed of 4.6 m/s in a circular orbit around a stationary particle of charge 1 x 10-6C
The overall topic of the paper should be "Momentum" ... you can select from the following sub-topics
A football punter accelerates a football from rest to a speed of 7 m/s during the time in which his toe is in contact with the ball (about 0.16 s). what average force does the punter exert on the ball
calculate the radius of the circular orbit if the magnetic field is B=1.7 and the velocity is 6.3x10^6. assuming it is 1 electron
As a space craft approaches a planet, the rocket engines on it are fired to slow it down so it will go into orbit around the planet. how long must the engines be fired
A uniform beam is supported by a cable at one end and force of friction at the other. Cable at least 30 degrees. Length of beam 6m. Friction is .86 and mass is 100kg. Find the minimum X distance we can add 250 kg and the beam not slip from the wall
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