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A 100g piece of gold that is heated to 160C and placed in 200g of 20C water. What is the equilibrium temperature if the specific heat of gold is 0.128J/gC and specific heat of water is 4.18 J/gc?
A large man sits on a 4-legged chair with his feet off the floor. The combined mass of the man and chair is 95.0 kg.what pressure does each leg exert on the floor
A 28 Vpp square wave (50% of the time at +28 volts and 50% of the time at 0 volts) is connected to a 4 ohm speaker. Calculate the average power delivered to the speaker
A 1.5 kg crate falls from a height of 2.0 m onto a spring scale where the spring constant is 1.5 ´ 105 N/m. when you calculate the gravitational potential energy
An electron in a multi-electron atom has l=3. Find what values of its other quantum numbers (n, m1,ms) are possible
A large tank is filled with methane gas at a concentration of 0.690 kg/m3. The valve of a 2.00-m pipe connecting the tank to the atmosphere is inadvertantly left open for 11.0 hours. determine the cross-sectional area of the pipe
A point charge Q is placed inside a hollow metal sphere of radius R. The sphere is hold no net charge. What is voltage on the surface of the sphere
sam whose mass is 66 kg takes off across level snow on his jet-powered skis. the skis have a thrust of 270 n and a
Shaving/makeup mirrors typically have one flat and one concave(magnifying) surface. You find that you can project a magnified image of a lightbulb onto the wall of your bathroom if you hold themirror 1.6 m from the bulb and 3.8 m from the wall.
Three negative charges of equal magnitudes are positioned along the x-axis at x = -a, x=0, and x = +a respectively. How does the potential energy of the system of charges change as a result
A barbell spins around a pivot at its center at A. The barbell consists of two small balls, each with mass 450 grams (0.45 kg), Calculate the moment of inertia I of the barbell
A baseball is thrown horizontally at the catcher, who is 60.0 ft away. It is thrown with a velocity of 87.5 mph. How far does the baseball fall during this pitch.
A 850 kilogram car pushes a 2400 kilogram truck that has a dead battery. Find the magnitude of the force of the truck on the car
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