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A bat crashes into the vertical front of an accelerating subwaytrain. If the coefficient of friction between the bat and the trainis 0.86, what is the minimum acceleration of the train that willallow the bat to remain in place?
A proton is at the origin and an electron is at the point x= 0.35nm , y= 0.34nm .Find the electric force on the proton.
A house at the bottom of a hill is fed by a full tank of water 6.0 m deep and connected to the house by a pipe that is L = 83m long at an angle of ? = 67? from the horizontal. Determine the water gauge pressure at the house
An anemometer for measuring wind speed consists of four metal cups, each of mass m = 140 g, mounted on the ends of four essentially massless rods of length R= 0.37 m. The rods are at right angles to each other and the structure rigidly rotates..
Michael Phelps won a gold medal at the 2008 Beijiing olympics by swimming the 200 meter medley in 1:54:80. On an off-day Mike swims the medley in 1:58:32. What is the speed in mph? (Give the ans. to two decimal places)
Two loudspeaker, 4.0 m apart and facing each other, play identical sounds of the same frequency. You stand halfway between them, where there is a max. of sound intensity. moving from this point toward one of the speakers, you encounter a min. of s..
A 0.642 kg basketball is dropped out of a window that is 6.42 m above the ground. How much work is done on the ball by its weight
An archer's bow is drawn at its midpoint until the tension inthe string is 1.20 times the force exerted by the archer. What is the angle between the two halves of the string
two gliders a and b with mass 0.50 kg and 0.30 kg respectively move toward each other at 2.0 ms on frictionless linear
A beaker of mass 1.5kg containing 3.2kg of water rests on a scale. A 3.2kg block of a metallic alloy of density 53400 kg/m is suspended from a spring scale is submerged in water of density 1000 kg/m.
Calculate the maximum current density in a lead wire of diameter 4 mm at a temperature of 4.2K if the wire is to remain superconducting. The relevant values for lead are Tc= 7.19k and Bc =6.39 x104 A/m . (note that the magnetic field in the wire is g..
The log has a mass m= 984 kg; the truck has a mass M=8750 kg. Calculate the minimum coefficent of static friction u needed to keep the log in the back of the truck
A cubical box with sides of length 0.305 m contains 1.760 moles of neon gas at a temperature of 285 K. What is the average rate (in atoms/s) at which neon atoms collide with one side of the container? The mass of a single neon atom is 3.35x10-26 kg
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