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Your moving car contains a lot of energy as kinetic energy - energy of motion.
If your car is not a hybrid, when you stop by stepping on the brake, your energy of motion is transformed by friction (in the brakes, against the road) into thermal energy. It can't be re-used. Estimate how many gallons of gasoline you could save each time you stopped your car from a speed of 100 km/hr if you could store that energy somehow and re-use it. [Hint: One gallon of gasoline contains about 1.2 x 109 Joules of energy. (1 Joule = 1 kg-m2/s2).] Be sure to clearly state your assumptions and how you came to the numbers you estimated, since grading on this problem will be mostly based on your reasoning, not on your answer.
The magnetic field of a certain motor is produced by solenoids whose windings are connected in parallel with the armature across the same potential difference of 115V. The coils have a resistance of 60.0 ohms and the armature a resistance of 4.0 o..
An electric force moves a charge of +2.00E-4 C from point A to point B and performs 5.81E-3 J of work on the charge. What is the dissimilarity (EPE A – EPE B) among the electric potential energies of the charge at the two points?
Consider a Carnot engine that works between thermal reservoirs with temperatures of 1030.0 K and 297.0 K. How much energy is delivered to the cooler reservoir
In addition to dark matter cosmologists have proposed dark energy. The reason for this was the discovery of: A) slowing down of the expansion of the universe B) cosmic background radiation C) acceleration of the expansion of the universe D) gravitati..
On April 13, 2029 (Friday the 13th!), the asteroid 99942 mi Apophis will pass within 18600 mi of the earth-about 1/13 the distance to the moon! It has a density of 2600 kg/m^3, how much kinetic energy would it deliver
You drive a car 1600 feet to the east, then 2400 feet to the north. The trip took 3.5 minutes. Determine the magnitude of your average velocity
The coefficient of linear expansion of gold is 14 x 106 °C. Find the coefficient of linear expansion on Fahrenheit scale
A circular saw blade 0.250 meter in diameter starts from rest. Evaluate the angular acceleration and the angle through which the blade has turned in this time
Three fire hoses are connected to a fire hydrant. Each hose has a radius of 0.013 meter. Evaluate the water speed in each hose
If 40 g of hot water at 80°C is poured into a cavity in a very large block of ice at 0°C, what will be the final temperature of the water in the cavity? Explain how much ice must melt in order to cool the hot water down to this temperature?
A duck is floating on a lake with 30% of its volume beneath the water. What is the average density of the duck
A particle of mass M13. 10 and traveling horizontally with a speed of V0 = 12.2 m/s hits the rod and sticks to it. The particle's path is perpendicular to the rod at the instant of the hit and it hits at a distance d from the rod's center. At what..
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