What is the magnitude and direction of the gravitational force that acts on a person who weighs 500 N at Earth's surface?
What will be an ideal response?
Answer: 500 N straight downward, which is the weight of the person.
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An object is placed 25 cm in front of a lens of focal length 20 cm. 60 cm past the first lens is a second lens of focal length 25 cm. How far past the 25 cm lens does the final image form?
a. 20 cm b. 40 cm c. 16 cm d. 25 cm e. 47 cm
Two isotopes have the same __________ number
Fill in the blank(s) with correct word
An ideal transformer is used to either increase or decrease the voltage in an AC circuit. When the output voltage is greater than the input voltage of a transformer then
A. the power output is smaller than the power input. B. the power output depends on the ratio of turns in the primary and secondary. C. the power output is the same as the power input. D. the power output is larger than the power input.
What is the Big Bang?
A) An enormous explosion that organized all matter in the universe. B) The creation of matter and the universe. C) The creation of the primeval fireball. D) An explosion that spewed matter all over the universe. E) The event that started the expansion of the universe.