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If your pupil diameter is 2.0 mm, as it would be in fairly bright light, what is the smallest diameter circle that you can barely see as a circle, rather than just a dot, if the circle is at your ne
How does the electrostatic potential energy of a system of two positive point charges change when the distance between them is tripled? it is unchanged, it is reduced to one-ninth its original value
The position of a water balloon from a 100m high cliff is given by r(t) = [3ti + t^2j + sin(3.14t/2)k]m. Find the location, velocity, acceleration, as well as the distance the balloon is away from t
The gas is held at constant pressure as the energy is removed. What is the change in temperature of the gas due to the removal of the energy? Give your answer in Kelvin to three significant digits.
An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges. What is the speed of the electron when it is 10.0cm from charge
A pair of slits is located near a screen in such a way that light incident on the slits can form a double slit interference pattern on the screen.
A 2.1mm -diameter glass bead is positively charged. The potential difference between a point 2.5mm from the bead and a point 4.5 mm from the bead is 500 V. What is the charge on the bead?
An electron (mass 9.11 x 10-31 kg, charge 1.6x10-19 C) is placed half-way between the charges. What is the electrical field at this point? What is the force on this electron?
A circular metal plate of radius 0.2m has 10^10 excess electrons uniformly distributed over its surfaces. What is the magnitude AND direction of the field just outside the plate near its center?
An electron and a proton are separately placed at rest midway between two oppositely charged metal plates. Which particle, if either, will acquire more kinetic energy just before striking a plate? W
Determine the temperature at which a significant fraction of an ensemble of molecules populates the v=1 level at thermal equilibrium. Hint: as a first step calculate the characteristic vibrational t
If the mass of the first particle is 5.5 x 10-7 kg, what are (a) the mass of the second particle and (b) the magnitude of the charge (in C) of each particle?
A conducting sphere of radius R1 carries a charge Q. Another conducting sphere has a radius of R2= 2R1, but carries the same charge. The spheres are far apart. The ratio E2/E1 of the electric field
Calculate the volume charge density of the atmosphere, assuming it to be uniform between 210 and 360 m. (Hint: You may neglect the curvature of Earth. Why?) Units should be in C/m3
What is the acceleration of the car in m/s^2? How many meters does the car travel before stopping under these conditions in m?
An Other Frame moves with a speed of 0.6 relative to the Home Frame. An object at rest in the Home Frame has a length of 30 ns. What is the object's length in the Other Frame?
At a time when mining asteroids has become feasible, astronauts have connected a line between their 3120-kg space tug and a 5910-kg asteroid. They pull on the asteroid with a force of 308 N.
The woman pushes on the man with a force of 54 N due east. Determine the acceleration (magnitude and direction) of (a) the man and (b) the woman.
Suppose the weight of the sky diver is 948 N and the drag force has a magnitude of 1045 N. The mass of the sky diver is 96.7 kg. Take upward to be the positive direction. What is his acceleration, inc
The ball remains in contact with the cushion for a time of 3.10 × 10-3 s. What is the average net force (magnitude and direction) exerted on the ball by the cushion?
A rocket of mass 4.44 × 105 kg is in flight near earth's surface. Its thrust is directed at an angle of 54.5° above the horizontal and has a magnitude of 9.71 × 106 N. Find the (a) m
The electrodes are attached by metal wires to the terminals of a 13 V battery. After a long time, the capacitor is disconnected from the battery but is not discharged. Part A: What is the charge on
A ball is launched at 100 m/ s at 75 degrees from a 40m tall building. Find the Max Height, how far the ball lands from the launch site, the velocity in the x & y directions, in the y-direction
A 70 block of iron is removed from an 800furnace and immediately dropped into 200 of 20 water. What fraction of the water boils away?