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Consider a star of mass M=10Msun, composed entirely of fully ionized C-12. Its core temperature is 6*10^8K. a. What is the mean particle mass mbar in units of m(hydrogen)?
You are standing in air and are looking at a flat piece of glass (n = 1.52) on which there is a layer of transparent plastic, Find the smallest possible nonzero value for the thickness of the layer
A 100 g aluminum calorimeter contains 250 g of water. The two substances are in thermal equilibrium at 10°C. Determine the specific heat of the unknown second sample
How much would a 80.0 kg person weight on Mars, where the acceleration of gravity is 3.93 m/s^2, and on Earths Moon, where the acceleration of gravity is 1.63 m/s^2.
A trap door, of length and width 2.75 m, is held open at an angle of 65.0° with respect to the floor. what is the torque exerted on the trap door by the rope
A toy train rolls around a horizontal 1.3--diameter track. The coefficient of rolling friction is 0.12. What is the magnitude of the train's angular acceleration
A 5.0-kg crate is being pulled along a horizontal, smooth surface. What is the acceleration of the crate in m/s2
An aluminum bar of mass 2.00kg at 300 C is thrown into a lake. The temperature of the water in the lake is 15.0 C; what is the change in total entropy Delta
A typical coal-fired power plant burns 320 metric tons of coal every hour to generate 700 of electricity. What is the power plant's thermal efficiency
q1. a chair of mass 14.0 kg lies atop a horizontal floor the floor is not frictionless. you push on the chair with a
question11. the moon has a diameter of 3.48 106 m and is a distance of 3.85 108 m from the earth. the sun has a
As two boats approach the marina, the velocity of boat 1 relative to boat 2 is 2.13 m/s in a direction 40.3° east of north. What is the direction of the velocity of boat 2
A string under a tension of 60.0 N is used to whirl a rock in a horizontal circle of radius 2.70 m at a speed of 20.5 m/s on a frictionless surface as shown in the figure below. As the string is pulled in, the speed of the rock increases. When the st..
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