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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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?
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.