What two facts did Newton need to be able to calculate the acceleration of the Moon?
a. The distance to the Moon and the diameter of the Moon.
b. The time it takes the Moon to make one revolution and the distance from the Earth to the sun.
c. The diameter of the Moon and the speed of the Moon's rotation.
d. The diameter of the Moon and the diameter of Earth.
e. The distance to the Moon and the time it takes the Moon to make one revolution.
e
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A circular loop (radius = 0.50 m) carries a current of 3.0 A and has unit normal vector of (
)/3. What is the x component of the torque on this loop when it is placed in a uniform magnetic field of (
)T?
A. 4.7 N ? m B. 3.1 N ? m C. 19 N ? m D. 9.4 N ? m E. 12 N ? m
Magnifying Glass With the Image at Infinity: When a person with a near point at 28 cm uses a certain magnifying glass, it produces an angular magnification of 7.0 with the image very distant. What is the focal length of the lens of this magnifying glass?
A. 2.0 cm B. 3.0 cm C. 4.0 cm D. 5.0 cm E. 6.0 cm
State the First Law of Thermodynamics
What will be an ideal response?
In the asteroid impact theory of the extinction of the dinosaurs some 65 million years ago, the dinosaurs (and over half of all the other species on Earth at that time) died off largely because
A) of injuries suffered from direct hits of pieces of the asteroid or comet. B) dust injected into the stratosphere from the impact absorbed visible light from the Sun, causing global temperatures to plummet. C) radiation from iridium in the asteroid caused the dinosaurs to die of cancer. D) the impact caused massive earthquakes and volcanic activity worldwide. E) dust settled on the leaves of plants, making them inedible, so the animals died of starvation.