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In the old days, people thought that the Sun might be a burning briquette of coal. At the Earth, the intensity of the radiation of the Sun is about 1400 W/m2. Assume that the intensity is constant with time. The mass of the Sun is 2.0×1030 kg, and its distance from the Earth is 1.5×1011 m. The heat energy contained in coal is approximately 25 MJ/kg. How long would the Sun shine, if it really were a piece of burning coal?
What total impulse was imparted by these forces. Near Earth, the density of protons in the solar wind (a stream of particles from the Sun) is 12.0 cm-3, and their speed is 702 km/s. Find the current density of these protons.
a closed organ pipe resonates with frequency 6hz and an open organ pipe resonates with frequency 12hz. if the two organ
Two canal workers pull a barge along the narrow waterway at a constant speed. One worker pulls with a force of 105 N at an angle of 28 degrees with respect to the forward motion of the barge, What is the magnitude of the force on the barge from the..
Two cars collide at an icy intersection and stick together afterward. The first car has a mass of 1600 kg and was approaching at 7.00 m/s due south. Calculate the final velocity of the cars
The three capacitors C= 2.0E-6F in series are connected across a 30V battery. Find the potential difference across each
A fan is spinning at 900 rpm. When its motor is turned off it makes 75 rev before coming to a stop. If the work down by dissipative forces is 44.4J, Find the moment of Inertia of the fan and the torque due to dissipative forces.
A 3.0 kg block of silver is completely immersed in water. calculate the mass of water displaced by the silver block
A ball rolls horizontally with a speed of 9.0m/s off the edge of a tall platform. what is the height of the platform
questiona 5kg block at first has a speed of 1.5ms at the top of a 30?nbspincline and slides a distance of 5.0m down
A 75 kg person travels in a car at 50. mph over a hill. The radius of curvature at the peak of the hill is 90. m. What is the normal force of the seat pushing up on her
The car collides and becomes stuck to a 5000kg truck travelling west at along South Street at the intersection of South Street and Murdoch Drive. Illustrate what is the final velocity of the vehicles after the collision if the truck was travelling..
What is a unique characteristic of water between 0 and 4 degrees celcius - Need a question pertaining to heat and temperature dealing of course in physics.
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