Answer:
Candles
Explanation:
The answer is the first option or "candles." In ancient times the people would lit candles and place them in difference places in their homes, temples, etc... to produce light. It's not option B because light emitting diodes are used to light up toys and such which weren't invented in ancient times. It's not option C because fluorescent bulbs are long light bulbs used to light up huge spaces without as many light bulbs which were again not invented at the time, and it's also not option D because incandescent bulbs are you usual light bulbs which weren't invented at the time.
Hope this helps.
Hello jamaicandoll!
What is the force on a body if the mass of the body is 2300g? (acceleration due to gravity = - 9.8m/s²) .
Given,
- Mass (m) = 2300 g = 2.3 kg
- Acceleration (a) = -9.8 m/s²
- Force (F) = ?
We know that, force = mass × acceleration.
So,
F = ma
F = 2.3 × -9.8
F = 
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Hope it'll help you!
ℓu¢αzz ッ
Answer:
v = 2.348 m/s
Explanation:
Let:
h be the height of the child above the swing's low point,
v be the speed at the low point.
When the ropes make angle 3
25 deg. with the vertical:
h = 3.00(1 - cos(25)).
Equating potential energy at the high point to kinetic energy at the low point:
29.0 * 9.81 * 3.00(1 - cos(25)) = 29.0v^2 / 2
79.96 =29.0v^2 / 2
v = 2.348 m/s
