A battery with an emf of 12.0 V has a terminal voltage of 11.25 V when the current is 3.15 A. What is the load resistance, R?
a. 0.238 ?
b. 2.34 ?
c. 3.57 ?
d. 7.38 ?
c
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Methane gas absorbs the color ________, accounting for the colors of Uranus and Neptune
Fill in the blank(s) with correct word
A body at the end of a spring oscillates up and down ten times in five seconds. The period of oscillation is
a. 0.5 s. b. 2 s. c. 5 s. d. 10 s. e. not determinable.
Consider a radioactive substance with a half-life of 10 years. If you start with 1 kilogram of this substance, after 20 years, ________ of the radioactive substance will remain.
A) 0.25 kilogram B) none C) 0.75 kilogram D) 0.5 kilogram
A sewing machine needle moves up and down in simple harmonic motion with an amplitude of 1.27 cm and a frequency of 2.55 Hz
(a) What is the maximum speed of the needle? (b) What is the maximum acceleration of the needle? What will be an ideal response?