Answer:
A. friction is greatly reduced.
Explanation:
Maglev train runs on the principle of repulsion force due to magnetic field
here we know that magnetic field will apply force on the train which helps to levitate train in air
This is why it runs forward due to other component of magnetic force and hence it can run with high speed in air with least friction as there is no two surfaces in contact with each other
So here we can say that
Train run with very high speed due to least value of friction between two surfaces which moves relative to each other
so correct answer is
A. friction is greatly reduced.
Oxytocin causes contractions during pregnancy, it also is the reason why mothers feel "motherly" towards their children after childbirth as there are high levels on oxytocin in the mother's blood.
Answer:
We know that , mechanical advantage of lifting machine is
MA = W / P
For maximum mechanical advantage, we can substitute the value of P = mW + C
Explanation:
im not too sure about this one tho but i hope it helps
The lamp descends with the elevator so its acceleration is also 2.9 m/s². Take downward to be the positive direction. Then the net force on the lamp is
∑ F = w - t = ma
where w = mg = weight of lamp, t = tension in the cord, m = mass of lamp, and a = acceleration. Then
mg - t = ma
mg - ma = t
m (g - a) = t
m = t / (g - a)
so that the lamp's mass is
m = (52 N) / (9.8 m/s² - 2.9 m/s²) ≈ 7.5 kg
