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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 cup of water is heated with a heating coil that delivers 27.28W of heat. What is the mass of the water
What is the electric potential energy of a system that consists of two protons 2.1×10?15 m apart-as might occur inside a typical nucleus
Consider a bright star in our night sky. Assume its distance from Earth is 89.4 light-years (ly) and its power output is 4.00 multiply.gif 1028W, Find the intensity of the starlight at the Earth
Brain injuries generally occur any time the brain's acceleration reaches 100 g for even a short time, Consider a car running into a solid barrier
Light of wavelength 560 nm illuminates a single 0.77 mm wide slit. At what distance from the slit should a screen be placed, What is the width of the central maximum
A rocket is fired from the ground but at 30m it runs out of fuel, How fast is it going when it comes back down to earth
Suppose a distant world with surface gravity of 5.28 m/s2 has an atmospheric pressure of 7.16 multiply.gif 104 Pa at the surface. Calculate the pressure at a depth of 10.0 m in the methane ocean
the coefficient of static friction is 0.26. If you apply the minimum force needed to get the refrigerator to move, illustrate what will the acceleration then be?
A wheel has an initial angular velocity of (-24rad/s). If it atteins an angular velocity of (3rad/s) in time of 2 min, copmpute the centripetal acceleration
Eight identical light bulbs are connected in parallel with a 120-V power source, by two long leads with resistance 1.4 Ohms. 210 mA flow through each bulb, What is the resistance of each bulb
Write a complete set of equations from Kirchhoffs for the circuit -
At one instant, a mass (m = 2 kg) is at the location m and attached to one end of a spring with a spring constant ks = 60 N/m and a relaxed length L0 = 0.22 m. The origin is placed where the other end of the spring attaches to the ceiling.
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