- Initial velocity=u=30m/s
- Final velocity=v=10m/s
- Time=5s
Now
For the second question
Using 2nd equation of motion
In gas turbine engines, when the gas is compressed, the compression work requirements are negligible. This statement is false. So the correct option is (b).
An example of an internal combustion engine is a gas turbine. In essence, the engine can be thought of as an energy conversion system that transforms fuel energy into mechanical energy that is usable in the form of rotational power.
Since the steady-flow work is proportional to the specific volume of gas turbine engines, the compression work requirements are relatively high. Gases go through four thermodynamic processes in an ideal gas turbine: isentropic compression, isobaric combustion (constant pressure), isentropic expansion, and heat rejection. The Brayton cycle is made up of all of them.
Learn more about turbine engines here:
brainly.com/question/7324077
#SPJ4
Part (a):
number of electrons is represented by the atomic number.
So, in order to solve this part, we will get the number of atoms and multiply it by the atomic number to get the number of electrons.
number of moles = mass/molar mass = 0.0250/0.026982 = 0.926 moles
number of atoms = number of moles x Avogadro's number
= 0.926 x 6.022 x 10^23 = 5.579 x 10^23 atoms
number of electrons = number of atoms x atomic number
= 5.579 x 10^23 x 13 = 7.25 x 10^24 electrons
Part (b):
Coulomb's law can be written as follows:
<span>F = (k x q1 x q2) / r^2
</span>We will assume that q1 is equal to q2 in magnitude but opposite in direction
Therefore, q1 = q and q2 = -2
F = (<span>-k x q^2) / r^2
Substitute in the equation by the force, coulomb's constant and the radius to get q and then divide q with the fundamental charge to get number of electrons as follows:
</span><span>1.00 x 10^4 = -(8.9 x 10^9 x q^2)/(0.8)^2
q = 8.479 x 10^-4 (ignoring the negative sign as it states only direction)
number of electrons = 1.6 x 10^-29 x </span>8.479 x 10^-4 = 1.35 x 10^-22 electron
Part (c):
To get the fraction, simply divide your answer from part (b) by your answer from part (a) as follows:
fraction = (1.35 x 10^-22) / (7.25 x 10^24) = 1.86 x 10^-47
It will take the battery 15 hours to discharge completely.
<h3>Energy stored in a battery</h3>
Energy is defined as the ability or capacity to work. The formula for calculating the energy stored in a battery is expressed as;
Energy stored=Power×Time
Energy stored = ΔV * t
where
ΔV is the change in velocity
t is the time
Substitute
Energy stored = 12.0 * 90.0
Energy stored = 1080 W.h
Total power consumed by the headlight = 2 * 36
Total power consumed by the headlight = 72Watts
Determine the time it takes to dischage
Time = Energy Stored/Power
Time = 1080/72
Time = 15hrs
Hence it will take the battery 15 hours to discharge completely.
Learn more on energy consumption here: brainly.com/question/24338873
#SPJ4
A convex mirror of focal length 10 cm forms an upright and magnified image of a real object placed at a distance of 20 cm from the mirror. A concave lens causes light to diverge. A concave mirror can produce either real or virtual images. ... The images produced by a convex mirror are smaller than the object it reflects.