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Sliding friction is useful for starting fires.
a. If you press a wooden peg against another piece of wood and spin the peg rapidly, it can become hot enough to ignite. The peg produces thermal energy no matter how fast it spins, so why is it important that it spin rapidly?
b. If you strike a piece of flint against a piece of steel, you can shave a red-hot spark off the steel. However, moments later the surface of the steel itself barely feels warm. What happens to the thermal energy in that surface?
c. When you rub a match on a matchbook, it suddenly bursts into flames. The principal source of heat here is a chemical reaction in the match head. What purpose does the initial thermal energy serve in starting this reaction?
d. what is a safety match? How does it work?
e. You might see a "cowboy match" in a movie light a match by rubbing it on the heel of their boot. How does a match light that way?
What is the probability that a freshman selected at random from this group is enrolled in an economics and/or a mathematics course.
Find the amount of work in joules required to empty the trough by pumping the water over the top. (Note: Use as the acceleration due to gravity.)
calculate area of a square a square picture is mounted in a frame 1 cm wide. the area of the picture is 2/3 of the total area. find the length of a side of the picture.
The largest set on which the functionf(x,y)=1/(16-x2-y2)is continuous is?A. The interior of the circle x2+y2=16 B. The exterior of the circle x2+y2=16
S List and count the number of possible combinations of objects from three sets, e.g., how many different outfits can one make from a set of three shirts, a set of two skirts, and a set of two hats?
If the eggs are removed four, five and six at a time, then three, four, and five eggs will remain respectively. If they are taken out seven at a time, no eggs will be left over. Find the lease number of eggs that could be in the basket.
Where x is the number of years since the material was put into the vault. If 200 pounds of the material are initially put into the vault, how many pounds will be left after 90 years?
A cable that weighs 6 lb/ft is used to lift 850 lb of coal up a mine shaft 300 ft deep. Find the work done.
What is the probability that a freshman selected at random from this group is enrolled in each of the following? (Enter your answers to three decimal places.)
M(dv/dt)= -cv-mg v(0)=0, find v(t) and check that your answer satisfies the initial condition and the differential equation.
Ten percent of all undergraduates at a university are chemistry majors. In a random sample of nine students, find the probability that exactly two are chemistry majors. (Round your answer to 4 decimal places.)
Describe the major phases of statistics. Formulate a business problem and analyse it by applying these phases?
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