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Consider electron in graphene, which is a planer monoatomic layers of carbon atoms, if the dispersion relation of electrons is taken to be E(b) = cb (where c is a constant), over the entire b-space, then the Fermi energy Ef depends on the number density of electron as?
Two men decide to use their cars to pull a truck stuck in mud. What is the net forward force exerted on the truck in the direction it is headed
To throw the discus, the thrower holds it with a fully outstretched arm. Starting from rest, he begins to turn with a constant angular acceleration, what will be the speed of the discus at release
A typical adult ear has a surface area of 1.49 × 10-3 m2. The sound intensity during a normal conversation is about 2.11 × 10-6 W/m2 at the listener's ear. How much power is intercepted by the ear
A smaller solenoid is placed inside a larger solenoid so they have the same axis (like concentric cylinders). The inner solenoid has radius r=0.01meters, N=1000turns, and resistance R=10Ohms. Its two leads are connected to an ammeter to form a circui..
A 1000 kg aircraft going 25 m/s collides with a 1500 kg aircraft that is parked. how far did they skid
Give a symbolic expression for the change in reading of the scale.
A 22 cm diameter circular saw blade spins at 3200 rpm. How fast would you have to push a straight hand saw to have the teeth move through the wood at the same rate as the circular saw teeth?
An astronaut of mass 73 kg pushes off a satellite of mass 420 kg, exerting a force of 120 N for the 0.82 s they are in contact. What is the speed of the astronaut after they have separated
The Trans-Alaskan pipeline is 1300 km long, reaching from Prudhoe Bay to the port of Valdez, and is subject to temperatures ranging from -73°C to +35°C. How much does the steel (average coefficent of linear expansion 11 x 10-6 (°C)-1) pipeline expand..
A hollow cubical box is 0.109 meter on an edge. This box is floating in a lake with 1/4 of its height beneath the surface. Calculate the depth of the water in the box
An ideal gas expands at a constant pressure of 2.1 atm from 457 mL to 713 mL. Heat then flows out of the gas, at constant volume, What is the total heat flow into the gas
A water dispenser for pets has an inverted plastic bottle. When a certain amount of water is drunk from the bowl, more water flows automatically from the bottle into the bowl. The bowl never overflows.
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