Answer:
5.8 m/s
Explanation:
First, we can find the net velocity of the ball. In fact, we know that the total time of travel is
While the total displacement is
d = 40.2 m
So, the net velocity is
We know that the direction of the velocity is equal to that of the displacement, so
above the positive x axis. Therefore, we can find the velocity along the y-axis:
And since the initial motion of the ball was only along the x-axis, we can say that this is the speed at which the stricker kicked the ball.
Answer:
The second material's index of refraction is 1.17.
Explanation:
Given that,
Refractive index of the material, n = 1.29
Critical angle is 65.9 degrees.
We need to find the second material's index of refraction. We know that at critical angle of incidence, angle of refraction is equal to 90 degrees. Using Snell's law as:
So, the second material's index of refraction is 1.17.
The acceleration of gravity on Pluto is 0.62 m/s² .
The acceleration of gravity on Earth is 9.81 m/s² .
Earth's gravity is (9.81/0.62) = 15.8 times as strong as Pluto's gravity.
So any object that weighs 2.7N on Pluto would weigh
(2.7N) x (15.8) = 42.7 N on Earth .
42.7 Newtons = about 9.6 pounds .