The value that should be reported for the total mass of three samples of iron will be 0.143 Kg or 143 g
<h3>
What is Mass and Weight ?</h3>
Mass is the quantity of matter. While weight is a gravitational pull on an object. Mass is measured in Kg while weight is measured in Newton.
What value should be reported for the total mass of three samples of iron weighing 117.0 g, 19.43 g, and 6.1043 g?
The total mass will be the sum of the three masses.
The total mass = 117 + 19.43 + 6.1043
The total mass = 142.5343 g
Convert gram to kilogram by dividing the answer by 1000
The total mass = 142.5343/1000
The total mass = 0.1425343 Kg
Therefore, the value that should be reported for the total mass of three samples of iron will be 0.143 Kg or 143 g approximately
Learn more about Mass and Weight here: brainly.com/question/1384116
#SPJ1
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.
Answer:
<em>Sara must climb 10609 stairs to burn this food.</em>
<em></em>
Explanation:
Chemical energy content in Sara's body = 788 kCal x 4.184 = 3296.99 kJ = 3296990 J
her body is only 25% effective in converting chemical to mechanical energy, therefore,
available mechanical energy = 25% of 3296990 = 0.25 x 3296990 = <em>824247.5 J --this is equivalent to the work she must do to burn this stored energy</em>
flight of stairs = 12 cm = 0.12 m
Sara's mass m = 66 kg
Sara's weight = mg = mass x acceleration due to gravity 9.81 m/s^2
weight W = 66 x 9.81 = 647.46 N
work done = force x distance climbed d
putting in the necessary values, we have
824247.5 = 647.46 x d
d = 1273.05 m
the number of stairs Sara must climb is equal to the distance climbed divided by the height of a single stairs
number of stairs = 1273.05/0.12 = 10608.75 ≅ <em>10609 stairs</em>
Hello:
First, <u>the normal force</u> in y axis:
∑Fy = 0
∑Fy = N - Fy
∑Fy = N - 20 N * sen 37°
∑Fy = N = 12,87 N
Formula:
R = ma
F - F' = ma
F - (μN) = ma
20 N - (0.2 * 12,87 N) = 3 kg * a
20 N - 2.574 N = 3 kg * a
17,426 N / 3 kg = a
a = 5,8 m/s²
