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Part A. If the mass of 1.0 kg of coal (or any substance) could be completely converted into energy, how many kilowatt-hours of energy would be produced? Express your answer using two significant figures.
Part B. Assume that the average U.S. family of four uses 700 kWh of electric energy each month and that modern power plants are 33% efficient in converting this released energy into electric energy. How long would this mass be able to supply the U.S. public with electric energy? Express your answer using two significant figures. (Answer in Days)
For N2 at 25oC and 1.00 atm calculate the number of collisions per second made by one molecule; the number of collisions per second per cubic centimeter; compare these values to N2 at 25oC and 1.0*10^-6 torr using the values already calculated Show a..
A 45 kg girl is standing on a 130 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.33 m/s relative to the plank.
An object experiencing a constant force accelerates at12 m/s. What will the acceleration of this object be if the force is halved
You have a 2.5kg copper block at room temperature. Find the energy required to melt the copper once it's reached the melting point
What is the minimum pressing force that must be used.
A uniform metal rod, with a mass of 3 {rm kg} and a length of 1.2 {rm m}, is attached to a wall by the hinge at its base. A horizontal wire bolted to the wall 0.51 m above the base of the rod holds the rod at an angle of 25{rm ^circ} above the hor..
When a pilot takes a tight turn at high speed in a modern fighter airplane, the blood pressure at the brain level decreases blood no longer perfuse the brain, and the blood in the brain drains.
The amount of work done when a force of one Newton acts through a distance of one meter is equal to a __________. Select one: a. calorie b. celsius degree c. Joule d. kilogram
Dan is gliding on his skateboard at 3.0 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is Dan going as his feet hit the ground
What is the fundamental minimum uncertainty in a dimension of the position of the electron in the previous problem if its momentum is simultaneously deliberate to a precision of plus or minus one percent (two percent total)?
the lowest pressure attained in a "vacuum" in a laboratory on the earth is 1X10^-17 atm at a termperature of 4.1 K. what is the number of molecules per cubic centimeter in this vacuum
An unmarked police car traveling a constant 85km/h is passed by a speeder. what was the speeder's speed
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