Humanity uses energy at the rate of about 16 TW If we found a way to extract this energy from Earth's rotation

The stars, gas and dust in a galaxy rotate about the center of the galaxy. We...

The stars, gas and dust in a galaxy rotate about the center of the galaxy. We would like to know exactly how to describe the rotation of all parts of the galaxy. In other words, we want to know if galaxies rotate like merry-go-rounds, or like planets orbit the Sun, or in some other way. 1. Do points near the center of a merry-go-round complete a full rotation in the same amount of time as points near the outer edge...

Question 1 Pumped storage reservoirs are a way of    _____   energy, ready to   _____    electricity when we...

Question 1 Pumped storage reservoirs are a way of    _____   energy, ready to   _____    electricity when we need a lot of it in a hurry. When there is a sudden _____ in demand most power stations take a long time to increase their _____ . Whilst we're waiting for them we would have power cuts, possibly with_____ consequences if, for example we lost traffic lights or air traffic control. Pumped storage reservoirs such as the one at   _____in North_____can go from nothing...

If a person of mass M simply moved forward with speed V, his kinetic energy would...

If a person of mass M simply moved forward with speed V, his kinetic energy would be 12MV2. However, in addition to possessing a forward motion, various parts of his body (such as the arms and legs) undergo rotation. Therefore, his total kinetic energy is the sum of the energy from his forward motion plus the rotational kinetic energy of his arms and legs. The purpose of this problem is to see how much this rotational motion contributes to the...

An online card game uses a deck of 32 cards containing 4 Aces, 8 Kings, 16...

An online card game uses a deck of 32 cards containing 4 Aces, 8 Kings, 16 Queens, 2 Jacks and 2 Tens. In each round of the game the cards are shuffled, the players make a bet about what type of card will be drawn, then a single card is drawn and the winners are paid off. The drawn card is reinserted into the deck before the next round begins. i. How much information does a player receive when she...

In the first lesson we talk about the heat transfer that takes place in the human...

In the first lesson we talk about the heat transfer that takes place in the human body, but the same types of transfer occur for any object. For the following question, use the dimensions and characteristics of your own home. It’s reasonable to assume that walls are thick enough to block direct heat loss to radiation (without prior conduction through the walls). Windows are relatively thin in comparison and conduct more heat than walls (i.e. a double-pane glazed window has...

The two equations below express conservation of energy and conservation of mass for water flowing from...

The two equations below express conservation of energy and conservation of mass for water flowing from a circular hole of radius 2 centimeters at the bottom of a cylindrical tank of radius 20 centimeters. In these equations, Δ m is the mass that leaves the tank in time Δt, v is the velocity of the water flowing through the hole, and h is the height of the water in the tank at time t. g is the accelertion of gravity,...

this is a thermodynamics course We want to model energy and mass balance issues involved in...

this is a thermodynamics course We want to model energy and mass balance issues involved in strenuous exercise, for example the running of a marathon. Suppose a 70 kg marathon runner runs at an ≈8 minute/mile pace, completing the 26.2 mile race distance in 210 minutes, or 3.5 hours. a.) Physiological measurements indicate that the total power consumed by an average weight runner (70 kg) at a pace of 8 minutes/mile is about 900 kcal/hour. What is the total energy...

Please answer all, Thank you. 1. A firework is designed so that when it is fired...

Please answer all, Thank you. 1. A firework is designed so that when it is fired directly upwards, it explodes and splits into three equal-massed parts at its peak. Someone launches the firework directly upwards and measures the locations of two of the pieces of the firework. They find that one piece landed 2 meters to the left and another piece landed two meters in front of them. Where did the third piece of land? 2. A Newton's cradle is...

For an ideal solution, we discussed in class that the chemical potential is given by: μ=μ_0+RT...

For an ideal solution, we discussed in class that the chemical potential is given by: μ=μ_0+RT "ln" (c/c_0 ) where the units of µ written in this form are Joules/mole. The concentration c_0 is a reference concentration, which we will take to be 1 Molar for this problem. Suppose solution 1 with solute concentration of 1 mM (i.e., 1 x 10-3 Molar) is in contact with solution 2 with solute concentration of 0.1 mM (i.e., 1 x 10-4 Molar). If...

1. Inside a Red Giant, denser elements fuse and emit sufficient energy to balance thermal expansion...

1. Inside a Red Giant, denser elements fuse and emit sufficient energy to balance thermal expansion versus gravity, until fusion of: silica & sulphur helium carbon & oxygen iron deuterium & tritium 2. Structure of the Universe: 2dF and the Sloan Microwave Digital Survey plotted clusters of galaxies. What kind of structure was seen among super-clusters of galaxies? Filaments of galaxies surround voids that have no or very few galaxies inside. Super-clusters expand outward from a Big Bang source. Super-clusters...