Answer: Friction stops things from sliding apart. If there was no friction everything would slide to the lowest point. With no friction the only possible movement would be falling to a lower point under gravity.
Explanation: In a frictionless world, more objects would be sliding about, clothes and shoes would be difficult to keep on and it would be very difficult for people or cars to get moving or change direction. Students should be encouraged to consider how dependant their world is on the beneficial action of friction. Humans and other objects will become weightless without gravity. If we have no gravity force, the atmosphere would disappear into space, the moon would collide with the earth, the earth would stop rotating, we would all feel weightless, the earth would collide with the sun, and as a consequence.
An interval of 1 degree Celsius is equal to 1 Kelvin
Explanation:
There are different scales used for measuring temperatures. The most common ones are:
- Celsius scale: it is set by the following convention: the zero in this scale is placed at the freezing temperature of the water, while the 100 degrees is placed in corresponding to the boiling point of water. The the scale is divided into 100 equal intervals between these two points. Temperatures in this scale are indicated with the Celsius degree (
.
- Kelvin scale: it is set such that the absolute zero (the temperature at which particles in matter stop to have any motion) is placed at zero in this scale. A difference of 1 degree in this scale is equal to 1 degree Celsius. Temperatures in this scale are indicated with the Kelvin (K).
The conversion between the two temperatures is:
So for example, the absolute zero (
) corresponds to 
in the Celsius scale. However, intervals between two temperatures are measured in the same way in the two scales: therefore, an interval of 1 degree in the Celsius scale is equal to an interval of 1 Kelvin in the Kelvin scale.
Learn more about temperatures here:
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Answer:
Force = 22508.86 N
Explanation:
Given:
Area of the window, A = 2.02 m²
Air pressure inside the house, P₁ = 1.02 atm
External air pressure, P₂ = 0.910 atm
Now, The difference in the pressure, ΔP = P₁ - P₂ = 1.02 - 0.910 = 0.11 atm
or
ΔP = 0.11 atm × (101300 Pa / 1 atm )
ΔP = 11143 Pascals
Now,
the Force is given as:
Force = Pressure × area
on substituting the values, we get
Force = 11143 Pa × 2.02 m²
or
Force = 22508.86 N
Answer:
Correct answer: P = 38,793.1 W = 38.7 kW
Explanation:
Power is calculated according to the following formula:
P = A / t
where A is the work performed and t the elapsed time
work is a measure of changing energy
A = ΔEp = m · g · h we will take that g = 10 m/s
A = 4,500 · 10 · 25 = 1,125,000 J
P = 1,125,000 / 29 = 38,793.1 W = 38.7 kW
P = 38,793.1 W = 38.7 kW
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