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Ipatiy [6.2K]
3 years ago
14

A learner sets up a circuit to determine the conductivity of certain solids. What piece of apparatus is not required for the nex

t experiment ?
A. battery
B. light bulb
C. conducting wire
D. stopwatch​
Physics
1 answer:
Lilit [14]3 years ago
4 0
It is D as u dont need a stop watch aft that
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A ball is thrown directly downward with an initial speed of 8.50 m/s, from a height of 29.7 m. After what time interval does it
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Using the following formula for linear-motion, the missing variable can be solved:

s = Vi * t + 1/2 (a * t^2) 

Where: s = displacement = 29.7 m
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Substituting:

29.7 = 8.5t + 1/2 (9.8*t^2)
29.7 = 8.5t + 4.9t^2

Dividing both sides by 4.9:

6.06 = 1.73t + t^2
t^2 + 1.73t - 6.06 = 0
(t - 1.74)(t + 3.48) = 0
t = 1.74s

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