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Questions in physics
📝 Answered - The original amount of a radioactive sample should be multiplied by which expression to calculate the amount of the sample that remains after $n$ half-lives have passed? A. $(1 / 2) \times n$ B. $(1 / n)^2$ C. $(1 / 2)^n$ D. $1 /(2 n)$
📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
📝 Answered - 5. (a) What do you understand by the following terms as applied in physics? (i) Couple of force (ii) Centre of gravity (iii) Centre of mass
📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
📝 Answered - A particle is projected vertically upwards from the ground with speed [tex]$30 ms^{-1}$[/tex]. Calculate the: (a) Maximum height reached by the particle. (b) Time taken by the particle to return to the ground. (c) Time (s) taken for the particle to attain a height of 4 cm above the ground. Take [tex]$g = 10 ms^{-2}$[/tex]
📝 Answered - Why are objects that fall near Earth's surface rarely in free fall? A. Gravity does not act on objects near Earth's surface. B. Air exerts forces on falling objects near Earth's surface. C. The objects do not reach terminal velocity. D. The objects can be pushed upward by gravity.
📝 Answered - Which of these travels fastest in a vacuum? A. air B. water C. light D. sound
📝 Answered - An electric device delivers a current of [tex]$15.0 A$[/tex] for 30 seconds. How many electrons flow through it?
📝 Answered - Which of the following is the reason that your feet are burned by sand on a beach, but cooled by the ocean just a few feet away? A. Water's low freezing point B. Water's high boiling point C. Water's high specific heat D. Water's high surface tension
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