Explanation:
180 million km = 10 min
? = 1 min
180 million x 10 = 1,800,000,000 km
180 million km = 600s
? = l s
108,000,000,000km
12.5 = 100 * (1/2)^n
divide by 100:
0.125 = (0.5)^n
this is equivalent to:
, which equals 3.
(since 0.5 cubed = 0.125)
In the first tenth of a second in a collision, the vehicle and everything inside is going in different directions. This is because the initial reaction in a collision is for the objects to go into different directions which can be explained by Newton's third law.
It will take 20 seconds for the car to attain a speed of 34 m/s
Explanation:
- Acceleration of an object is given by a = velocity/time.
- Here, acceleration of the car = 1.7 m/s² and velocity = 34 m/s. Using these, find time.
- Time = velocity/acceleration
= 34/1.7 = 20 s
So it takes 20 seconds to attain a speed of 34 m/s
Answer:
B.
The light waves are completely blocked.
Explanation:
The intensity of the light coming out after two polarizers is given by Malus' Law:
where
is the initial intensity of light before the polarizers
is the intensity of light after the two polarizers
is the angle between the axes of the two polarizers
In this problem, we have two polarizers with their axes placed perpendicular to each other: this means that the angle is 90 degrees
Therefore, the cosine factor is zero:
And this means that the intensity of light after the two polarizers is also zero:
So, the correct option is
B. The light waves are completely blocked.