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A prospector finds a solid rock composed of granite (? = 2650 kg/m3) and gold. The volume of the rock is 3.00e-4 m3 and its mass is 3.48 kg.
(a) What mass of gold is contained in the rock in kg?
(b) What percentage of the rock is gold by volume?
(c) What percentage of the rock is gold by mass?
A 50 kg woman stands on the back of a 6 m long, 125 kg raft that is floating at rest in still water with no friction. The raft is 0.50 m from a fixed pier.
Two electrons are fixed 2.6 cm apart. Another electron is shot from infinity and comes to rest midway between the two. What was its initial speed
Determine the angular acceleration of the pulleys and the tension T in the cord supporting the 612 Kg mass when it is released from rest.
A dentist uses a small mirror of radius 55 mm to locate a cavity in a patient's tooth. If the mirror is concave and is held 20 mm from the tooth, what is the magnification of image.
Two charges are placed on the x axis. One of the charges q1= +8.5 C is at x1 = + 3.0 cm and the other q2= -21C is at x1 = + 9.0 cm. Find the net electric field (magnitude and direction) at.
A wheel has a radius of 3.6m. How far (path length) does a point on the circumference travel if the wheel is rotated by angles of 30°, 30 rad, and 30 rev, respectively.
In a classical model of the hydrogen atom, the electron orbits a stationary proton in a circular orbit
The gravitational force between two masses M and m separated by a distance r is 40 N. What is the new force when this distance is halved?
What is the potential energy of the elevator
An AC generator operates at 22 V and delivers 200 W of power through an ideal (no loss) transformer to the load with the resistance 4.0 \Omega
If each rock strikes the fixture travelling at 10.0 {rm m}/{rm s} horizontally and rebounds at 2.00 {rm m}/{rm s} backwards, how high above the lowest point does collision make your light fixture swing?
The coefficient of kinetic friction between the block and incline is = 0.45. The mass of the spring is negligible.
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