A light ray strikes a glass plate of thickness 0.80 cm at an angle of incidence of 60°. The index of refraction of the glass is 1.55. By how much is the beam displaced from its original line of travel after it has passed through the glass?
What will be an ideal response?
0.54 cm
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Mild, short-term cooling periods during the Earth's history are known as
A) ice storms B) nuclear winters C) snowball Earth D) ice ages
How many galaxies are there in the observable universe?
A) about as many as the number of stars we see in the sky with our naked eyes B) infinity C) roughly a thousand times more than the number of stars in our galaxy D) roughly (within a factor of 10 ) the same as the number of stars in our galaxy E) about as many as the number of grains of sand on all the beaches on Earth
Which is heated in its interior by nuclear processes?
A) Sun B) Earth C) both of these D) neither of these
A child and an adult are walking. Their legs swing like physical pendulums and both swing through the same maximum angle. The adult is 1.5 times as tall as the child, and all their dimensions are scaled proportionately
They also have the same mass per unit volume. If the walking speed of the adult is 1.3 m/s, what is the walking speed of the child?