A 500 g ball swings in a vertical circle at the end of a 1.4-m-long string. when the ball is at the bottom of the circle, the tension in the string is 18 n.
By Newton's second law, the net force on the object acting parallel to the surface is
∑ F = F[applied] - F[friction] = (8k g) (3 m/s²)
If F[applied] = 30 N, then
30 N - F[friction] = 24 N ⇒ F[friction] = 6 N
so the answer is B.
Answer: 110km/h
100+10=110km/h
Explanation:
Motion is defined as a change of position. The frame of reference is usually assumed to be at rest. If one is sitting on a bus, the road appears to be moving backwards relative to the observer. If he/she now walks to the front of the bus, he has a speed relative to the earth which is now greater than that of the bus hence the answer.
Answer:
Yes it is possible to have total internal reflection for light incident from air on water.
Explanation:
- The objective of total Internal Reflection is giving the full reflection of a ray of light within a medium.Rainbow is the best example for this question.
- It can be explained by the example of a rainbow in which light from the sun is travelling in the medium if air and goes through total internal reflection in the tiny water droplet resulting in splitting of the white light into its 7 components and thus forming a rainbow.
We can use the formula:
acceleration = change in velocity / time
a = (9 - 4) / 0.5
a = 10 mi/h²
Now, we will also check the units. In the numerator was mi/h and the denominator was h so the units become mi/h².
