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A 3.0 kg block of aluminum isheated from 20°C to 90°C at atmospheric pressure.
(a) Find the work done by the aluminum.
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(b) Find the amount of energy transferred to it by heat.
(c) Find the increase in its internal energy.
A hunter aims directly at a target (on the same level) 140 m away.
Explain how to determine the total resistance of a parallel and a series circuit. How does total resistance affect the current in each type of circuit
Two people are pulling a boat through the water as in the figure below. Each exerts a force of 600 N directed at a ? = 45.0° angle relative to the forward motion of the boat
Car 1 has a mass of m1 = 65000 kg and a velocity of v01 = +0.80 m/s. Car 2 has a mass of m2 = 92000 kg and a velocity of v02 = +1.2 m/s, overtakes car 1 and couples to it. Determine the velocity of their center of mass (a) before and (b) after the co..
A 20-cm-radius ball is uniformly charged to 88nC, What is the ball's uniform charge density (C/m3) and What is the electric field strength at points 5, 10, and 20 cm from the center
A ladder is leaning against a vertical wall. Determine the maximum angle with the vertical the ladder can make without falling on the ground
A 0.650 MeV x-ray is Compton scattered at 90° by a free electron in an aluminum foil. a) What is the wavelength of the incident photon? b) What is the wavelength of the scattered photon? c) What is the energy of the recoiling electron?
An equilateral triangle has sides of lengthL. Charges of +Q,-2Q,and +3Q are placed at the vertices. Find the electric field midway between the two positive charges
The problem is determining the index of refraction. A microscope focuses on a tiny scratch in the upper surface of a plate of glass,then the barrel position is recorded. Next the microscope is lowered by 1.87mm and a focused image of the scratch i..
Two locomotives approach each other on parallel tracks. Each has a speed of v = 95 km/h with respect to the ground. how long will it be before they reach each other
In the Bohr model, the electron in H has a circular orbit. For an isolated atom, the only force on the electron is the strictly radial electrical force. Does this violates the uncertainty principle
a spherical ball hanging on a string on a smooth, frictionless wall. The mass of the ball is m, its radius is R, and the length of the spring is L. Find the normal force between the ball and the wall
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