Which of these nuclei has the least mass?
A) hydrogen
B) iron
C) lead
D) uranium
E) all the same
Answer: A
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A wave with a frequency of 2 Hz will have a period of ________
Fill in the blank(s) with correct word
Pollution is always a consequence of exploitation of resources
What will be an ideal response?
A heavy frog and a light frog jump straight up. They push off in such a way that they both have the same kinetic energy just as they leave the ground. Assume air resistance is negligible
Which of the following statements about these frogs are correct? (There could be more than one correct choice.) A) Just as they leave the ground, the heavier frog is moving faster than the lighter frog. B) Just as they leave the ground, the lighter frog is moving faster than the heavier frog. C) They both leave the ground with the same speed. D) The lighter frog goes higher than the heavier frog. E) The heavier frog goes higher than the lighter frog. F) Both frogs reach the same maximum height.
Photography Optics: The focal length of the lens of a simple film camera is 40.0 mm. By what amount should the distance between the lens and the film be increased or decreased to change the focus from a person who is 25 m from the lens to one who is 4.0 m from the lens?
A. 0.2 mm B. 0.3 mm C. 0.4 mm D. 0.5 mm E. 0.7 mm