Answer:
0.6 seconds
Explanation:
The time to fall from height h is ...
t = √(2h/g)
t = √(2(1.86 m)/(9.8 m/s^2)) ≈ √0.3796 s ≈ 0.616 s
It would take about 0.6 seconds for the projectile to hit the ground.
The resistance of the element is 
Explanation:
The relationship between voltage, current and resistance in an electrical conductor is given by Ohm's law:

where
V is the voltage
R is the resistance
I is the current
For the heating element in this problem, we have
I = 9 A is the current
V = 12 V is the voltage
Solving for R, we find the resistance of the element:

Learn more about current and resistance:
brainly.com/question/4438943
brainly.com/question/10597501
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The Density of a solid that is 5.23×10−6kg/mm3 is equivalent to 5230 kg/m^3
<h2>Further Explanation
</h2>
- Density is defined as the mass per unit volume of an object.
- Therefore density is given by mass of an object divide by its volume.
That is; D = M/V
- Density is measured in grams per cubic centimeter (g/cm³)
- For instance the density of water is 1 gram per cubic centimeter (1 g/cm³)
- However, density may be expressed in kilograms per cubic meter (kg/m³)
- For Example the density water may be expressed as 1000 kg/m³.
- Other units of measuring density may be converted into SI units.
For example; In this case we are given density as 5.23 x 10^-6 kg/mm3
This density can be converted to kilograms per cubic meters as required;
1 x 10^9 mm^3 = 1 m^3
Therefore;
1 mm^3 = 1.0 x 10^-9 m^3
Hence;
5.23 x 10^-6 kg/mm^-3 = (5.23 x 10^-6 kg)/ 1 x10^-9 m^3
<u> = 5230 kg/m^3 </u>
- Density depends on both mass and volume of an object. An object with high mass will have more density compared to an object with a lower mass.
- Therefore, density is directly proportional to mass and inversely proportional to the volume of the object.
Keywords: Density
<h3>Learn more about:
</h3>
- Density: brainly.com/question/11107994
- Formula for calculating Density; brainly.com/question/1795189
Level: High school
Subject: Physics
Chapter: Density
Answer:
<h2>The scale will read 1kN</h2>
Explanation:
The man will feel heavy than they really are (because the floor is pushing up on them with a force larger than their weight)
like wise if the elevator descends the man will feel lighter than he is
we know
Force= mass X acceleration due to gravity
given that the mass m of the man=100kg
free fall acceleration is= 10 m.s^2.
the scale reading will be equal to the force F
F=100*10
F=1000N
The scale will read 1000N or 1kN