A concave mirror has a focal length of 20 cm. What is the position (in cm) of the resulting image if the image is inverted and four times smaller than the object?
A. 15
B. 25
C. 50
D. 100
E. ?15
Answer: B
Physics & Space Science
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When resistors are connected in parallel, we can be certain that
A) the same current flows in each one. B) the potential difference across each is the same. C) the power dissipated in each is the same. D) their equivalent resistance is greater than the resistance of any one of the individual resistances.
Physics & Space Science
As a tile falls from the roof of a building to the ground its momentum is conserved
A) True B) False
Physics & Space Science
How many calories of heat are required to raise the temperature of 4 kg of water from 50°F to the boiling point?
a. 6.5 × 10^5 b. 3.6 × 10^5 c. 15 × 10^5 d. 360 e. 4 × 10^4
Physics & Space Science
The Milankovitch cycles are
What will be an ideal response?
Physics & Space Science