Answer:
= 1,386 m / s
Explanation:
Rocket propulsion is a moment process that described by the expression
- v₀ =
ln (M₀ / Mf)
Where v are the velocities, final, initial and relative and M the masses
The data they give are the relative velocity (see = 2000 m / s) and the initial mass the mass of the loaded rocket (M₀ = 5Mf)
We consider that the rocket starts from rest (v₀ = 0)
At the time of burning half of the fuel the mass ratio is that the current mass is
M = 2.5 Mf
- 0 = 2000 ln (5Mf / 2.5 Mf) = 2000 ln 2
= 1,386 m / s
Answer:
When the temperature of the gas is increased from 20 to 40, the pressure will be 2p
Explanation:
Given;
initial temperature of the gas, T₁ = 20 K
final temperature of the gas, T₂ = 40 k
initial pressure of the gas, P₁ = P
final pressure of the gas, P₂ = ?
Apply pressure law of gases;
Therefore, when the temperature of the gas is increased from 20 to 40, the pressure will be 2p
Answer:
(a). The critical angle for the liquid when surrounded by air is 44.37°
(b). The angle of refraction is 26.17°.
Explanation:
Given that,
Incidence angle = 26.7°
Refraction angle = 18.3°
(a). We need to calculate the refraction of liquid
Using Snell's law
Put the value into the formula
We need to critical angle for the liquid when surrounded by air
Using formula of critical angle
Put the value into the formula
(b). Given that,
Incidence angle = 37.5°
Speed of light in mineral
We need to calculate the index of refraction
Using formula of index of refraction
Put the value into the formula
We need to calculate the angle of refraction
Using Snell's law
Put the value into the formula
Hence, (a). The critical angle for the liquid when surrounded by air is 44.37°
(b). The angle of refraction is 26.17°.
Answer:
v ≈ 4.47
Explanation:
The Formula needed = <u>KE = </u><u> m v²</u>
<u></u>
Substitute with numbers known:
2000J = × 200kg × v²
Simplify:
÷100 ÷100 (Divide by 100 on both sides)
2000J = 100 × v²
= v²
20 = v²
√ √ (Square root on both sides)
√20 = √v²
4.472135955 = v (Round to whatever the question asks)
v ≈ 4.47 (I rounded to 2 decimal places or 3 significant figures, as that is what it usually is)
Answer:
(a)
(b)
Explanation:
The average power is defined as the amount of work done during a time interval:
According to work-energy theorem, the work done is equal to the change in kinetic energy. So, we have:
Recall that the weight is given by:
The car accelerates uniformly from rest (). Replacing (3) in (2), we have:
(a) Finally, we replace this in (1):
(b)