Answer: 6.4 times.
Explanation:
First, remember the definition of work as:
W = F*d
where W is work, F is force and d is distance.
The work applied when using the machine is:
W = 10N*14m = 140J
The work that you would apply if you did not use the machine is:
W' = 180N*5m = 900J.
The ratio W'/W is = 900J/140J = 6.4
This means that the machine has made 6.4 times the work easier. (you needed 6.4 times less work to do the task
The answer is B, the vector represents magnitude and direction
An 0.075 c point charge's surrounding gaussian surface's electric flux is 8.5 ×10⁹Nm²/C.
<h3>Which is a gaussian surface?</h3>
In three dimensions, the Gaussian surface is referred to as a closed surface where the flux of a vector field may be determined. The gravitational field, the electric field, or the magnetic field are all examples of these vector fields.
<h3>Why is a Gaussian surface drawn?</h3>
We build a fictitious Gaussian surface around the supplied surface when the surface of which an electric field or flux must be established is asymmetrical or the surface area is challenging to obtain, such as the surface area for an infinitely long wire or plane. The Gaussian surface is said to utilize symmetry the best.
When a charge q is surrounded by a gaussian surface, the electric flux that passes through it is
= 0.075 / ( 8.85 ×10⁻¹²)
= 8.5 ×10⁹Nm²/C.
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Complete question:
(b) How much energy must be supplied to boil 2kg of water? providing that the specific latent heat of vaporization of water is 330 kJ/kg. The initial temperature of the water is 20 ⁰C
Answer:
The energy that must be supplied to boil the given mass of the water is 672,000 J
Explanation:
Given;
mass of water, m = 2 kg
heat of vaporization of water, L = 330 kJ/kg
initial temperature of water, t = 20 ⁰C
specific heat capacity of water, c = 4200 J/kg⁰C
Assuming no mass of the water is lost through vaporization, the energy needed to boil the given water is calculated as;
Q = mc(100 - 20)
Q = 2 x 4200 x (80)
Q = 672,000 J
Q = 672,000 J
Q = 672,000 J
Therefore, the energy that must be supplied to boil the given mass of the water is 672,000 J