The Yerkes refracting telescope has a 1-m-diameter objective lens of focal length 20 m and an eyepiece of focal length 3.5 cm. What is the magnification of the planet Mars as seen through this telescope?
a. 140
b. 280
c. 570
d. 1,000
e. 35
c
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Where did helium come from the early Universe?
A. The early Universe was so hot and dense that fusion of protons (hydrogen) into helium could occur. B. Photons bombarded hydrogen atoms and broke them up into helium atoms. C. Helium was formed in the cores of stars formed in the early Universe. D. Helium was not formed in the early Universe, because only neutrons were present.
Two of the Galilean moons of Jupiter are the size of Mercury, and the two others are about as big as our own Moon
Indicate whether the statement is true or false
The type of plate boundary at which one plate collides with another and subduction occurs is called ______________
a. transform b. divergent c. convergent d. none of these
An airplane flies horizontally with a speed of 300 m/s at an altitude of 400 m. Assume that the ground is level. At what horizontal distance from a target must the pilot release a bomb so as to hit the target?
a. 3.0 km b. 2.4 km c. 3.3 km d. 2.7 km e. 1.7 km