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Suppose a planet had a density that varied with radius according to the equation, ρ =A/r, where A is some constant. Determine a formula that gives the central pressure for this type of planet.
Two friends, Al and Jo, have a combined mass of 136 kg. At an ice skating rink they stand close together on skates, at rest and facing each other, with a compressed spring between them. The spring i
It has been estimated that the Earth contains 109 metric tons of natural uranium that can be mined economically. How many atoms of 235U are there in 109 metric tons of natural uranium?
A uniform electric field witha magnitude of 250 N/C is directed in the positive xdirection. A 12 uC charge moves from the origin to the point(20.0 cm, 50.0 cm). What is the change in the electrical
If the create has a mass of 110 and is 1.6 tall and 0.80 in depth and width, what is the minimum force needed to make the crate start tipping? (Assume the center of mass of the crate is at its cente
A cylindrical container with a cross-sectional area of 66.2 holds a fluid of density 816kg/m3, and the bottom of the container the pressure is 118 kPa. What is the depth of the fluid?
By how many degrees has your coffee cooled once the ice has melted and equilibrium is reached? treat the coffee as though it were water and neglect energy exchanges with the environment.
The center of the barbell is mounted on the end of a low mass rigid rod of length b = 0.525 m (see Figure), and this rod rotates clockwise with angular speed 100 rad/s. In addition, the barbell rota
The angle of refraction for the light entering the slab is the same as when the slab was in a vacuum. What is the index of refraction of the liquid?
Jimmy throws an apple to Billy at an angle of 52? with respect to the horizontal. The acceleration of gravity is 9.8 m/s2 . With what speed v0 must he throw the apple to reach Billy? Answer in units o
A boy drags a wooden crate with a mass of 20 kg, a distance of 12 m, across a rough level floor at a constant speed. What is the coefficient of friction of the crate on the floor?
a. If the box is moving at a constant speed of 0.35m/s and the coefficient of kinetic friction is 012. What is the magnitude of F? b. What is the magnitude of F if the box is speeding of with a cons
A 120 granite cube slides down a 40 degree frictionless ramp. At the bottom, just as it exits onto a horizontal table, it collides with a 290 steel cube at rest. How high above the table should the
The light of frequency 6 X10 to the 14th power Hz falls on a pair of slits that are .0002 cm apart. The center of the slits is 50 cm from the screen. How far from the central bright line will the f
The beam is not deflected in this region. If the magnetic field has a magnitude of 0.731 T and points in the +y direction, find the magnitude and direction of the electric field. Give the x, y, and
A 54 kg person escapes from a burning building by jumping from a window 25 m above a catching net. Assuming that air resistance exerts a 95 N force on the person during the fall, determine the perso
The passengers in a roller coaster car feel 50% heavier than their true weight as the car goes through a dip with a 10 radius of curvature. What is the car's speed at the bottom of the dip? What is
An 8.0 m, 290 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.75, and the ladder makes a 50.0° angle with the ground. How
Approximately how much will the gravitational attraction between the Moon and Earth change between now and 499 million years from now?
Suppose we have an infinitely long wire carrying a current of 2.5 A. It is bent into an L-shape extending into positive infinities along the x- and y- axes. Find the magnitude of the magnetic field
Air is streaming horizontally past a small airplanes wings such that the speed is 50m/s over the top surface and 30m/s past the bottom surface. the plane has a mass of 300kg and a total wing area o
The temperature difference between the inside and the outside is the same for the wall and the window. Of the total heat lost by the wall and the window, what is the percentage lost by the window?
A catcher "gives" with a baseball when catching it. If the baseball exerts a force of 519 N on the glove, so that the glove is displaced 10.0 cm, how much work is done by the ball?
A capacitor is connected across the terminals of a 440 Hz generator with an rms voltage of 24 volts. When another capacitor is connected in parallel, the current increases by .36 A. Find the capaci
A 0.600 block is attached to a spring with spring constant 16.0. While the block is sitting at rest, a student hits it with a hammer and almost instantaneously gives it a speed of 45.0. What is the