2020-04-19
Solving problems, questions, calculations, linear motion 1
1. A car moves in a straight line from a static state to a state of constant acceleration. After 1000 m, the car achieves a velocity of 240 m/s. Calculate
i) the acceleration of the car
ii) time taken
iii) the velocity at t= 2 s.
Answer:
From the question the information we can get is
a = 0 m/s
v = 240 m/s
s = 1000 m
i) For acceleration
We can use the formula v^2 = u^2 + 2as
Refer to (http://fiziknota.blogspot.com/2020/04/linear-motion-formula.html)
^2 is squared
When we rearrange the formula we get
a = (v^2 - u^2) / 2s
= 240^2 - 0^2 / (2 x 1000)
= 28.8 ms^-2
ii) for time
We have to rearrange v = u + at
t = (v - u)/ a
= (240) / 28.8
= 8.33 s
iii) velocity at t = 2 s.
Using v = u + at
v = 0 + (28.8 x 2)
v = 57.6 m/s
Linear Motion Formula
Below are the common formula for Linear Motion:
Where
v = final velocity
u = initial velocity
s = displacement
a = acceleration
t = time
Where
v = final velocity
u = initial velocity
s = displacement
a = acceleration
t = time
2020-04-16
Generation of Electricity from Nuclear Fission
Nuclear energy is one of many alternatives of generating electricity. In fact, nuclear energy is primarily used to generate electricity.
Among the uses of nuclear energy are as a method to propel submarine, big vessels and satellites. Engines run by nuclear energy can go on without refuelling for one or two years.
The process of generating electricity is done by nuclear power plant or power station.
The process begins in the nuclear reactor:
i. The nuclear fission of Uranium 235 creates a massive amount of heat energy in the nuclear reactor. The heat of the uranium bundles in the core must be controlled to prevent overheating which can cause the reactor to melt.
ii. This energy is then used for boiling water which transforms it into steam at high pressure and temperature.
iii. This creates a powerful steam energy which rotates the turbines . The cold steam then moves to a condenser, condensed into water and then moves back to the reactor.
iv. The rotating turbines also spins a set of dynamos which produce electricity, this electricity is then further processed, adjusted and transported by cables to consumers.
It is really crucial to keep nuclear power plants in order as any leakage or accident will cause massive environmental and health damage.
Among the uses of nuclear energy are as a method to propel submarine, big vessels and satellites. Engines run by nuclear energy can go on without refuelling for one or two years.
The process of generating electricity is done by nuclear power plant or power station.
The process begins in the nuclear reactor:
i. The nuclear fission of Uranium 235 creates a massive amount of heat energy in the nuclear reactor. The heat of the uranium bundles in the core must be controlled to prevent overheating which can cause the reactor to melt.
ii. This energy is then used for boiling water which transforms it into steam at high pressure and temperature.
iii. This creates a powerful steam energy which rotates the turbines . The cold steam then moves to a condenser, condensed into water and then moves back to the reactor.
iv. The rotating turbines also spins a set of dynamos which produce electricity, this electricity is then further processed, adjusted and transported by cables to consumers.
It is really crucial to keep nuclear power plants in order as any leakage or accident will cause massive environmental and health damage.
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