Yes
Explanation:
One can pick up a nail using the curved part of the horseshoe magnet farthest from the poles.
A horse shoe magnet has magnetic fields all around it.
- In the presence of magnetic force fields, any magnetic object will be attracted to it.
- This is the case with any magnet.
- A magnet is any object with magnetic fields all around it.
- This field causes attraction to any magnetic objects especially metals.
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The main cause of the seasons is earths orbit since each time were in a new season the planet is facing the earth a different way which causes winter etc..
"2 km/hr/s" means that in each second, its engines can increase its speed by 2 km/hr.
If it keeps doing that for 30 seconds, its speed has increased by 60 km/hr.
On top of the initial speed of 20 km/hr, that's 80 km/hr at the end of the 30 seconds.
This whole discussion is of <em>speed</em>, not velocity. Surely, in high school physics,
you've learned the difference by now. There's no information in the question that
says anything about the train's <em>direction</em>, and it was wrong to mention velocity in
the question. This whole thing could have been taking place on a curved section
of track. If that were the case, it would have taken a team of ace engineers, cranking
their Curtas, to describe what was happening to the velocity. Better to just stick with
speed.
<span> 50 J
</span>Ke = 0.5 * m * v^2 ( m = mass(Kg), V = Velocity(m/s)
<span>= 0.5 * 4 * 5^2 </span>
<span>= 2 * 25 </span>
<span>= 50 J </span>
Answer:
Efficiency of this process is 30 %.
Explanation:
It is given that,
Electric energy used by the machine, 
The potential energy of the machine is increased, 
The efficiency of this machine is given by :
So, the efficiency of this process is 30 %. Hence, this is the required solution.
