Answer:
the speed of light in glass is 1.52 times smaller than in a vacuum
Explanation:
The speed of light in a medium is given by:
where
c is the speed of light in a vacuum
n is the refractive index of the medium, which is a number always greater than 1.0
From the formula, we see therefore that when light enters a medium, its speed decreases.
In particular, for glass the index of refraction is
n = 1.52
Therefore, this means that the speed of light in glass is 1.52 times smaller than in a vacuum.
Let us say that Cp is the specific heat of the metal object.
Then we do a heat balance (heat lost by metal = heat gained by water):
- 19g * Cp * (22degC – 96degC) = 75g * 4.184J/g degC * (22degC
– 18degC)
<span>Cp = 0.893 J/g degC</span>
Answer:
the answer is kg
Explanation:
because the s.i unit for mass is kilogram
Answer:
the speed of the bullet before striking the block is 302.3 m/s.
Explanation:
Given;
mass of the bullet, m₁ = 28.3 g = 0.0283 kg
mass of the wooden block, m₂ = 5004 g = 5.004 kg
initial velocity of the block, u₂ = 0
final velocity of the bullet-wood system, v = 1.7 m/s
let the initial velocity of the bullet before striking the block = u₁
Apply the principle of conservation of linear momentum to determine the initial velocity of the bullet.
m₁u₁ + m₂u₂ = v(m₁ + m₂)
0.0283u₁ + 5.004 x 0 = 1.7(0.0283 + 5.004)
0.0283u₁ = 8.5549
u₁ = 8.5549 / 0.0283
u₁ = 302.3 m/s
Therefore, the speed of the bullet before striking the block is 302.3 m/s.
When a force is applied to a car, the change in motion is proportional to the force divided by the mass of the car.