The geometry of an ellipse is described by two numbers: the ____ which is half the longest diameter of the ellipse and the ____ which tells us the shape of the ellipse
a. radius, eccentricity
b. radius, deferent
c. semi major axis, deferent
d. semi major axis, epicycle
e. semi major axis, eccentricity
E
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If the central engine for our Milky Way is a black hole of 3 million solar masses, then it has an event horizon about ________ kilometers across
Fill in the blank(s) with correct word
In 1912, after studying a star cloud called the Small Magellanic Cloud, Henrietta Leavitt concluded that:
A) stars are eternal and unchanging. B) the brightest stars have the shortest pulsation periods. C) the Sun and Earth are near the edge of our Galaxy. D) there was a relationship between pulsation periods and luminosities of stars.
The radius of Earth is 6,378 km. The force of gravity on a 1 kg ball at Earth's surface is 9.8 kg m/s2 . What is the force of gravity on this same ball when the ball is located 12,756 km from Earth's center? Hint: G = 6.67 10^-11 m3/s2/kg
a. 2.45 kg m/s2 b. 4.9 kg m/s2 c. 9.8 kg m/s2 d. 19.6 kg m/s2 e. 39.2 kg m/s2
The highest tides occur when
A) the Sun and the Moon are on the same side of Earth. B) the Sun and the Moon are on opposite sides of Earth. C) the Sun, Moon, and Earth form a right-angled triangle with Earth at the 90° vertex. D) the Sun, Moon, and Earth form a right-angled triangle with the Moon at the 90° vertex. E) the Sun, Moon, and Earth form a right-angled triangle with the Sun at the 90° vertex.