At Hiroshima, severe structural damage to buildings extended about 1 mile from ground zero, making a
circle of destruction 2 miles in diameter. The blast sent out a hyper-intensiﬁed shock wave which travelled
at (slightly above) the speed of sound, 1,125 ft/s, turning buildings into shrapnel There was little or no
structural damage outside of this one-mile radius. At one mile, the force of the blast wave was 5 psi, with
enough duration to implode houses and reduce them to kindling.
1. How much time would it take for the shock wave to reach a building one mile from
2. How fast was the shock wave moving in mph?
Halley's Comet (ofﬁcially designated 1P/Halley) is the most famous of the period comets and can
currently be seen every 75–76 years. Many comets with long orbital periods may appear brighter and
more spectacular, but Halley is the only short-period comet that is clearly visible to the naked eye, and
thus, the only naked-eye comet certain to return within a human lifetime. During its returns to the inner
solar system, it has been observed by astronomers since at least 240 BC, but it was not recognized as a
periodic comet until the eighteenth century when its orbit was computed by English astronomer Edmond
Halley, after whom the comet is now named.
Due to Halley's highly eccentric orbit, it has one of the highest velocities relative to the Earth in the Solar
System. The 1910 passage was at a relative velocity of 157,800 mph.
3. If Halley’s Comet appears next in 1985 after its 1910 passage, how far did it travel
during that time?
According to MSN Encarta, the total length of all the veins in the human body, if put end to end, can wrap
around the earth 2 1/2 times. The circumference of the earth at the equator is 24,901.55 miles.
4. Calculate the total length of the veins in the human body in miles?
5. Find the total number of inches of veins in the human body?
Bald Eagles are sexually mature at four or ﬁve years of age. When they are old enough to breed, they
often return to the area where they were born. It is thought that Bald Eagles mate for life. However, if one
member of a pair dies or disappears, the other will choose a new mate. A pair which has repeatedly failed
in breeding attempts may split and look for new mates. Bald Eagle courtship involves elaborate calls and
ﬂight displays. The ﬂight includes swoops, chases, and cartwheels, in which they ﬂy high, lock talons, and
free fall, separating just before hitting the ground. The nest is the largest of any bird in North America; it is
used repeatedly over many years and with new material added each year may eventually be as large as
13 ft deep, 8.2 ft across and weigh 1.1 tons; one nest in Florida was found to be 20 ft deep, 9.5 ft across,
and to weigh 3.0 tons. The nest is built out of branches, usually in large trees near water. When breeding
where there are no trees, the Bald Eagle will nest on the ground. Eagles produce between one and three
eggs per year, but it is rare for all three chicks to successfully ﬂy. Both the male and female take turns
incubating the eggs. The other parent will hunt for food or look for nesting material. The eggs average
about 2.9 in long and have a breadth of 2.2 in.
6. How many pounds did the nest weight that was found in Florida?