3 protons should be your answer
It’s 25 because I already took the testing
<span>The correct answer is letter B. less than the angle of refraction. </span>When a beam of light passes at an oblique angle into a material of lower optical density, the angle of incidence is <span>less than the angle of refraction. The reason for that because the beam of light passes through an oblique angle.</span>
Answer:
Radius, r = 2.88 meters.
Explanation:
It is given that,
A hydrogen-filled balloon is used to lift a 120-kg stone off the ground, m₁ = 120 kg
The basket holding the stone has a mass of 10.0 kg, m₂ = 10 kg
Mass density of air, 
We know that buoyant force is equal to the weight of liquid displaced i.e.



B = 1274 N
Also, buoyant force is given by :





So, the minimum radius R of the balloon be in order to lift the stone off the ground is 2.88 meters. Hence, this is the required solution.
if in 1 second the jet goes 428 meters and you want to know how long it takes to go 237 meters you just divide 237/428
it can be written like this
_1_ = __x__
428 237
cross multiply
428 times x = 1 times 237
428x=237
divide by 428 on both sides
x= 237/428
x=0.5537 seconds