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Find probability of tunnelling and reflection of an electron at walls of the barrier.
Keeping the constant speed of 0.6m/s, a marble of mass 18 g rolls back and forth across a shoebox that is 14cm high and 2mm thick. Approximate the probability of its escaping through the wall of the
The two pulleys fastened together in Figure have diameters of 1.5 and 1ml. Their combined mass moment of inertia is 35 Kg.m2.
Block A in Figure is given an initial velocity of 6 m/s up the incline. It comes to a stop in distance d and then slides back down the incline with uniform acceleration.
The Rate of change in temperature of gas. An object of mass "m" specific heat "Cp" and surface area "As" and initially at a temperature "T0".
An object of mass "m" specific heat "Cp" and surface area "As" is initially at a temperature "To". The object is heated by a gas stream which is at a constant temperature "To". The object is heated
Assume that, when Hiawatha aims vertically, his arrow reaches a maximum height of 20 m. Use this fact to calculate the initial speed u with which Hiawatha can launch the arrow vertically.
assume that Hiawatha always launches arrows at the same initial speed, irrespective of their direction, and that he can run at 7.0 ms-1. Find out the minimum angle above horizontal at which Hiawatha
If light energy to electric energy conversion using solar cells is 5 percent efficient, how many square miles of land must be covered with solar cells to supply the electrical energy for 250,000 hou
A Carnot engine whose cold-reservoir temperature is 1.0 C has a thermal efficiency of 40 percent. By how much should the temperature of the hot reservoir be increased to raise the efficiency to 60 p
A nuclear power plant generates 2000 MW of heat energy from nuclear reactions in the reactor's core. This energy is used to boil water and produce high-pressure steam at 300 C. The steam spins a tur
Work out the mass of a ball and speed of a puck after collision and block's height when the speed is equal to v1/2.
For its size, the common flea is one of the most accomplished jumpers in the animal world. A 2.5mm -long, 0.49 mg critter can reach a height of 20cm in a single leap.
Finally, explain the importance of external forces acting on a system (in this case the external forces acting on cart and horse).
Find the average power and intensity level of a horn's sound, and difference in decibel levels of a sound source.
Activity and description of rock and cotton ball dropped on Earth. First drop them. Then drop them in the same size container. Make certain to explain your findings in terms of the
A student throws a set of keys vertically upward to her sorority sister in a window 4.0 m above. The keys are caught 1.50 s later by the sister's outstretched hand. With what initial speed were the
All through WWI, the Germans had a gun called Big Bertha that was used to shell Paris. The shell had an initial speed of 1700 m/s at an initial inclination of 55o to the horizontal. If air resistanc
The coefficient of static friction between a 5-kg block and a horizontal surface is 0.4. What is the utmost horizontal force that can be applied to the block before it slips.
A proton starting from rest is accelerated in a cyclotron to a speed of 3.0x10^6 m/s. How much work, in electron volts, is completed on the proton by the electrical force of the cyclotron that is ac
A Ferris wheel with a radius of 20m makes 1 revolution every 9seconds. What force does a 55kg passenger exert on the seat when she is at the top of the Ferris wheel.
The separation between hydrogen and chlorine atoms of the HCl molecule is about 1.30 × 10-10 m. What the location of the center of mass of molecule is as measured from the hydrogen atom (Chlor
Assume that the sun runs out of nuclear fuel and suddenly collapses to form a white dwarf star, with a diameter equal to that of the Earth.
A meter stick supported at the 50 cm mark has masses of 300 g and 200 g hanging from it at the 10 cm and 60 cm mark, respectively. Where must we hang a third, 400 g mass to keep the meter stick bala
The specific heat of a certain 50g metallic block is 900J/kg K. If the block is at an initial temperature of 80degrees Celsius, and dropped into a 50g bucket of water at 1 degree Celsius, what is th