Answer:
B
Explanation:
Astronomers cannot use parallax to find the distance to most stars. This is because the stars are: B too close.
They seek their natural resting places
Answer:
750 kN
Explanation:
Pressure = force / area
P = F / A
1,150,000 Pa = F / 0.65 m²
F = 747,500 N
Rounded to two significant figures, the force is 750,000 N, or 750 kN.
Answer:
The answer to your question is: 245 m
Explanation:
data
vo = 70 m/s
vf = 0 m/s
a = 10 m/s²
d = ?
Formula
vf² = vo² + 2ad
d = (vf² - vo²) / 2a
Process
d = (0² - 70²) / 2(10) substitution
d= 4900 / 20 simplify
d = 245 m
Answer: Nitrogen gas
Explanation:
Using ideal Gas's law
PV = nRT
where
Pressure of gas, P= 1atm
Volume of gas, V= 5.1L
no of moles of gas, n=
Ideal gas constant, R= 0.0821
Temperature of gas, T= 20°C = 20+273 = 293K
also, n= (mass/molar mass)
mass of the gas m = 5.9g
Molar mass of the gas = ?
So, PV = (mRT/M)
We're looking for molar mass M, then
M = mRT/PV
M = (5.9 * 0.0821 * 293)/(1 * 5.1)
M = 141.93/5.1
M = 27.8g/mol ~ 28g/mol
Since the gas is diatomic, then we say,
Atomic mass of gas = 1/2 * molar mass
Atomic mass = 1/2 * 28
Atomic mass = 14
Therefore, the gas is nitrogen.