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In fair weather, over flat ground, there may be a downward electric field of 155 N/C. (a) Assume that the Earth is a conducting sphere with charge on its surface. If the electric field just outside is 155 N/C pointing radially inward, calculate the total charge on the Earth and the charge per unit area.
A solid uniform marble and a block of ice, each with the same mass, start from rest at the same height H above the bottom of a hill and move down it. Find the speed of each of these objects when it reaches the bottom of the hill
One particle, of mass m, moves with a speed v in the x-direction, and another particle, of mass 2m, moves with a speed v/2 in the y-direction. What is the velocity of the center of mass of these two particles
You land on a new planet with radius 5000km. You measure the freefall acceleration due to gravity to be 8.5m/s^2 at the surface
To fit a contact lens to a patient's eye, a keratometer can be used to measure the curvature of the cornea-the front surface of the eye. Determine the radius of curvature of the cornea
A small compass is held horizontally, the center of its needle adistance of 0.120 m directly north of a long wire that isperpendicular to the earth's surface.
An electric fan is turned off, and its angular velocity decreases uniformly from 500 rev/min to 200 rev/min in a time interval of length 4.00 s. Find the number of revolutions made by the motor in the time interval of length 4.00s
Two points are given in polar coordinates by (r,?) = (3.0 m , 40.0°) and (r,?) = (5.0 m, -40.0°), respectively. What is the distance between them
When chasing a hare along a flat stretch of ground, a greyhound leaps into the air at a speed of 14.0 m/s, at an angle of 30.0° above the horizontal. What is the range of his leap
A Dodge car of mass 1103 kg traveling to the right at 22.40 m/s collides head-on with a Ford of mass 1258 kg traveling at the same speed but in the opposite direction. Calculate its final speed the moment after the collision
Three moles of an ideal gas are contained in a 75 L container at a pressure of 1.6 atm. What is the temperature of the gas
A certain light truck can go around a flat curve having aradius of 150 m with a maximum speed of 34.5 m/s. With what maximum speed can it go arounda curve having a radius of 88.5m
The longest recorded pass in an NFL game traveled 84 yards in theair from the quarterback to the receiver. Assuming that thepass was thrown at the optimal 45 degree angle, what was the speedat which the ball left the quarterbacks hand?
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