April 5, 2014
Ex. 2 Consider a water pipe that branches into two smaller pipes. If the flow of water is 10
gallons per minute in the main pipe and 4 gallons per minute in one of the branches, how
May 5, 2014
Ex. 2 Have you ever watched a fire and noticed that the burning of various materials
often produces flames of different colors? Why is this so?
Short answer, the different elements in the mater
March 25, 2014
Ex. 2 If the moon blew up, why would we not hear it?
Sound does not travel in a vacuum.
Ex. 29 What two physics mistakes occur in a science fiction movie that shows a distant
explosion in out
April 25, 2014
Ex. 5 Which has the shorter wavelengths, ultraviolet or infrared? Which has the higher
Infrared is longer, ultraviolet is higher.
Ex. 11 What is the speed of x-rays in a vacuum?
March 8, 2014
Ex. 30 Why will a volleyball held beneath the surface of water have more buoyant force
than if it is floating?
The volume displaced while the volleyball is floating is much less than when it i
March 16, 2014
Ex. 13 Why will wrapping a bottle in a wet cloth at a picnic often produce a cooler bottle
than placing the bottle in a bucket of cold water?
The water evaporating from the wet cloth is reduc
March 1, 2014
Ex. 10 What is the cause of the Brownian motion of dust particles? Why arent
larger objects, such as baseballs, similarly affected?
The cause is the collision of the visible particles and invi
February 21, 2014
Ex. 3 What would be the path of the moon if somehow all gravitational forces on it
vanished to zero?
A straight line.
Ex. 10 A friend says that the International Space station shown on the
February 17, 2014
Ex. 6 Two people who weigh the same climb a flight of stairs. The first person
limbs the stairs in 30s, and the second person climbs them in 40s. Which person does
more work? Which uses mor
February 7, 2014
Ex. 9 In an orbiting space shuttle, you are handed two identical boxes, one filled
with sand and the other filled with feathers. How can you determine which is which
without opening the boxe