Explanation:
Friction
Resistance defines friction. Friction consists of the resistance of one object in relation to another object with which it is in contact. Thus, friction is the force that opposes sliding motion, explains the Cornell Center for Materials Research. An example of friction involves removing a stain from clothing. You place detergent on a stained shirt, then repeatedly slide part of the shirt against the stained section. The friction eliminates the stain from the shirt.
Gravity
Gravity is simply defined as what goes up must come down. Gravity is the natural force exerted between two objects, drawing them toward each other. Therefore, instead of an object such as an apple thrown in the air staying there or floating, it falls down. Weight is extremely important to gravity. Gravity always exerts a force equal to the weight of the object it is acting on. A cup remains on a table because the upward force of the table is equal to the weight of the cup, causing it to stay in place.
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Answer:
Explanation:
Given:
mass, m = 87.5kg
Velocity, V = 0.900c
now,
the relativistic kinetic energy id given as:
...........(1)
where,
= relativistic factor, given as; 
Now, the classical kinetic energy is given as:
..........(2)
Dividing the equation (1) by (2) we get
or
substituting the values in the equation we get,
or
Explanation:
the concept of conservation of the mechanical nerve
initial
Em₀ = 500 J
The energy is totally kinetic
Em₀ = K = ½ m v₀²
v₀ =
v₀ = √ (2 500/32)
v₀ = 5.59 m / s
v² = v₀² - 2 a x
the negative sign is because its stopping
a =
a = (5.59² - 5.1²) / 2 50
a = 0.0524 m / s²
Newton's second law
F = ma
F = 32 0.0524
F = 1.68 N
Answer:
3.76
Explanation:
We are given that
Terminal speed in the spread -eagle position,
Terminal speed in the nosedive position,
We have to find the ratio of the effective cross-sectional area A in the slower position to that in the faster position.
We know that
Area, A=
The National
Fire Protection Association (NFPA) states that the furthest reaches of human
temperature viability is 212°F, well beneath temperatures found in most
noteworthy structure fires that are past the development (early) stage. In the
present fire conditions, temperatures higher than 500°F can be effortlessly gotten
inside three to four minutes. Flashover, which happens at roughly 1,100°F, can
grow well under five minutes.2 If a space isn't legitimate for firefighters,
caught casualties aren't probably going to survive either. Set aside the
opportunity to make it safe and keep your firefighters from going for broke.
<span>60% of the
casualties were found to have been presented to warm (most at temperatures over
200°F; some were beneath) and mugginess for six to seven minutes (remote from
the fire range).</span>
