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Q1. An open-pit coal mine consumes 96 hectares of land, down to the depth of 26 m, each year. What volume of earth, in cubic kilometres, is removed in this time?
Q2. Much of the material making up Saturn's rings is in the form of tiny dust grains having radii on the order of 10-6 m. These grains are located in a region containing a dilute ionized gas, and they pick up excess electrons. As an approximation, suppose each grain is spherical, with radius R = 1.2 x 10-6 m. How many electrons would one grain have to pick up to have a potential of -370 V on its surface (taking V = 0 at infinity)?
Assume that a binary star system consists of two stars of equal mass. They are observed to be separated by 310 million kilometres and take 4.0 Earth years to orbit about the point midway between them.
The centripetal and tangential accelerations are equal
Find out the edge dimension of each cube
What is mechanical energy dissipated by resistive forces
Points A and B have electric potentials of 243 V and 129 V, respectively. When an electron released from rest at point A arrives at point C its kinetic energy is KA. When the electron is released from rest at point B, however, its kinetic energy when..
Car A uses tires for which the coefficient of static friction is 1.1 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 25 m/s. Car B uses tires for which the coefficient of static friction is 0.65 on the s..
Illustrate the force vectors with their tails at the origin of coordinate system. The orientation of your vectors will be graded. The exact lengths of your vectors will not be graded but relative length of one to the other will be graded.
What is Horizontal angle of projectile
Illustrates the difference between acceleration and velocity
Two speakers, 6.00 m apart, are driven by the same audio oscillator so that each one produces a sound consisting of two distinct frequencies, 1000 Hz and 1360 Hz. The speed of sound in the room is 350 m/s.
A 18.0 kg block is dragged over a rough, horizontal surface by a constant force of 77.6 N acting at an angle of 35? above the horizontal. The block is displaced 10.8 m, and the coefficient of kinetic friction is 0.149.
At 500°C, the diffusion coefficient of Zn in brass is 4.10-17 m2.s-1. What is the flux of Zn moving down the rod.
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