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Two atoms will interact via electronical forces between their protons and electrons. One fairly good approximation to the electrical energy is the Lennard-Jones formula U(r)=k[(a/r)^12 - 2(a/r)^6] where r is the center-to-center distance between the atom and k is a positive constant. a) plot U vs r. b) determine the force that goes with this potential. c) show that the equilibrium separation is a. d) what is the effective spring constant about the point r=a?
A 64-kg runner rounds a circular track of radius 63.7 m at a constant 5.30 m/s. Find the magnitude of her momentum changes after she has gone one-fourth of the circle
The skis have a thrust of 220 . Sam's speed at the bottom is 45.0. Illustrate what is the coefficient of kinetic friction of his skis on snow?
In a physics lab, a cube slides down a frictionless incline and elastically strikes another cube at the bottom that is only 1/4 its mass. If the incline is 35 high and the table is 95 off the floor, where does each cube land.
An amusement ride consists of a car moving in a vertical circleon the end of a rigid boom. The radius of the circle is 10 meter.The combined weight of the car and riders is 5.0 kNewton. At thetop of the circle the car has a speed of 5.0 m/s.
A series R–L–C circuit of R= 210ohms , L= 0.950H and C= 2.25uF carries an rms current of 0.270A with a frequency of 100Hz. What is the average rate at which electrical energy is converted to heat in the resistor? P(R)= W What average power is deliver..
A commuter train blows its 200-Hz horn as it approaches a crossing. The speed of sound is 335 m/s. An observer waiting at the crossing receives a frequency of 208 Hz. What is the speed of the train
an ancient rock is found to contain ar40 gas indicating that 77 of the k40 in the rock has decayed since the rock
Two capacitors, C1 = 2.0mF and C2 = 7.0mF , are in series, Find the charge stored on the second capacitor
A block is hung by a string from the inside roof of a car. When the car goes straight ahead at a speed of 29 m/s, the block hangs vertically down. Then the string makes an angle θ with the vertical. Compute the angle θ
A 10-inch telescope is used to determine if what appears to be one star is actually two stars. Stars are so far away that they are essentially point sources. How close, in angle, can two stars be and still be resolved by this telescope? Use a wave..
Three point charges have equal magnitudes, two being positive and one negative. These charges are fixed to the corners of an equilateral triangle. Calculate the magnitude of the net force
Sue weighs 657 Newton on Earth. When she visits a distant planet, her weight is 77.1 Newton. Find what is the value of gravity on that planet
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