Answer:
3.18 m/s
Explanation:
Given that
Initial speed of the ball, u = 20 m/s
Angle of inclination, θ = 45°
Distance from the ball, h = 50 m
Using equations of projectile to solve this, we have
We start by finding the time of flight, T
T = 2Usinθ/g
T = (2 * 20 * sin45)/9.8
T = (40 * 0.7071) / 9.8
T = 28.284/9.8
T = 2.89 s
Next we find the Range, R
R = u²sin2θ/g
R = (20² * sin 90) / 9.8
R = (400 * 1) / 9.8
R = 400/9.8 = 40.82 m
Distance the gk must cover
40.82 - 50 m
-9.18 m or 9.18 m in the opposite direction.
Speed of the GK = d/t
9.18 / 2.89 = 3.18 m/s
Answer:
correct option is B. 1.39
Explanation:
given data
angle of incidence (θ) = 54.2 degrees
to find out
index of refraction of the glass
solution
we know that here reflected beam is completely polarized
so angle of incidence = angle of polarized ....................1
for reflective index we apply here Brewster law that is
μ = tan(θ) ...............2
put here θ value we get
μ = tan(54.2)
μ = 1.386
so correct option is B. 1.39
Answer:
a. blue light
Explanation: hope this helps :)
A couple things could be done such as recycling and using nonrenewable resources more efficiently.
Weight and mass are used synonymously on earth because the value of g is constant on the earth because the weight of a body is the amount of force exerted by the Earths gravity on an object of finite mass. And, the mass of an object gives the amount of matter in the body and is measured in kilograms.
