An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the radius were changed to 1 000 m, but the speed remained the same, by what factor would its centripetal acceleration change?
a. 0.25
b. 0.50
c. 1.00
d. 2.00
e. 4.00
B
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What causes the apparent retrograde motion of the planets?
A) It is an illusion created as we pass by a planet in our orbit (or the planet passes by us). B) It occurs when the planets reverse the direction of their orbits around the Sun. C) It is caused by the motion of planets around small circles that in turn go around bigger circles. D) It is an illusion created by our lack of depth perception in space. E) It is something we see only for planets that orbit the Sun in the opposite direction of Earth.
In some countries the AC frequency is 50 Hz. What is the time interval for one cycle at this frequency?
a. 0.0050 s c. 2 s b. 0.020 s d. 50 s
Describe the conditions of Earth during the Precambrian
What will be an ideal response?
The type of heat transfer that occurs between a heating lamp and the food that it is keeping warm is
A) convective. B) conductive. C) radiative. D) countercurrent. E) evaporation.