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Question
a) The proton-proton chain efficiently converts hydrogen into helium according to 4H →4 He. A Helium 4 nucleus weighs 6.64638 × 10-27 kg and a Hydrogen nucleus (a proton) weighs 1.67262 × 10-27 kg. Work out the change in mass when 1 kg of Hydrogen is transformed completely into Helium 4. Convert change in mass per kg into energy created, Joules per kg of Hydrogen, using Einstein's formula. E = mc2. (For comparison burning Gasoline releases only ∼ 4.5 × 107 Joules per kg.)
b) The rate that the sun burns in Joules per second is given by the solar luminosity, 4×1026 Watts. State the burning rate in terms of kg of Hydrogen converted per second. The mass of the Sun is 2 × 1030 kg. How long can the sun burn at this speed?
A person of mass 80 kg stands at the center of a rotating merry-go-round platform of radius 2.7 m, find the angular velocity when the person reaches the edge
A tube leads from a 0.150 kg calorimeter to a flask in which water is boiling under atmospheric pressure. Compute the heat of vaporization of water
An isolated piston+ cylinder arrangement shown contains a diatomic ideal gas at 300 K at equilibrium. find the new equilibrium temperature of the gas
A flexible chain weighing 37.0 N hangs between two hooks located at the same height. Find the magnitude of the force each hook exerts on the chain
A fish swimming in a horizontal plane has a velocity vi = (3.3i + 1.6j) m/s at a point in the ocean where the position relitive to a certian rock is ri = (10.5i - 3.9j) m. After the fish swims with a constant acceleration for 20.6 s, it's velocity..
In an experiment like you are going to do in Investigation 1 of lab this week, you count the number of beta rays from a 137Cs source. What is the average number of counts
A 300-kg load is hung on a wire of length 5.00 m, cross-sectional area 0.200 × 10-4 m2, and Young's modulus 8.00 × 1010 N/m2. What is increase in length of the wire
Just by the impact, the clay has speed v0 = 9 m/s, and the disk is rotating clockwise with angular speed w0 = 0.4 rad/s. Just following the impact, what is an angular speed of the combined system of wheel plus clay.
A 3.1 kg block of copper at a temperature of 72 C is dropped into a bucket containing a mixture of ice and water whose total mass is 1.2 kg. How much ice was in the bucket
From the top of a 40.0m high cliff, two rocks are simultaneously thrown. One is thrown upwards at 20.0m/s, the other is thrown downwards at 8.0 m/s. How far apart are the two rocks after 1.5 seconds?
Suppose you have an electric hot water heater for your house which is an aluminum cylinder which has a 0.6 m radius and is 1.2 m high. The walls are 1.0 cm thick.
A sailor strikes the side of his ship just below the surface of the sea. He hears echo of the wave reflected from the ocean floor directly below 9 s later. How deep is the ocean at this point.
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