A convex spherical mirror has a focal length of magnitude 20 cm. If an object is placed 10 cm in front of the mirror on the mirror's axis, where is the image located?
A) 20 cm behind the mirror
B) 20 cm in front of the mirror
C) 6.7 cm behind the mirror
D) 6.7 cm in front of the mirror
C
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Which of the following statements is true of the solar wind?
A) It makes the Sun gain mass. B) It can be considered an extension of the corona. C) It makes the gases from the solar atmosphere flow along the magnetic fields that point inward. D) It refers to slow-moving atoms and ions that enter the solar corona.
An airplane flies in a semi-circular arc in order to simulate “weightlessness” for its occupants. If the speed at which the plane flies is 750 km/hr, what is the radius of the semicircular path it flies in?
A. 57 km B. 1.6 km C. 4.4 km D. 2.2 km E. 76 km
The United States' effort to build an atomic bomb was named the ______________ Project
Fill in the blank(s) with correct word
Which is the most expensive source of electric power in common use today?
a. nuclear power b. standard batteries c. alkaline batteries d. watch batteries e. hydroelectric power