Here volume of gas is not given so question is solved assuming volume as 1 L.
The number of moles of 1 L gas present in the sealed container at a
pressure of 125 kPa at 25 degrees Celsius is 0.0067 moles.
The ideal gas law equation can be written as
PV = nR T
Here
P is the pressure of the gas in atm
V is the volume it occupies in L
n is the number of moles of gas present in the sample
R is the universal gas constant, equal to 0.0821 atm L/ mol K
T is the absolute temperature of the gas in Kelvin
Now, it's important to realize that the units you have for the volume, pressure, and temperature of the gas must match the unit used in the expression of the universal gas constant.
So
P = 125 kPa
1 atm = 760 kPa
P = 125/760 = 0.1644 atm
T = 25 degree celsius = 25 +273 = 298 K
Taking V = 1 L
So
n = PV/RT
n = 0.1644 x 1 / 0.0821 x 298
n = 0.0067 moles
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Answer:
Explanation:
Given that,
Charge on an electron is
q=1.609×10^-19C
Speed of electron V=4×10^5 m/s in positive x direction
V = 4×10^5 •i m/s
At this point F=0N
When the electron is moving in positive y direction
V =4×10^5 •j m/s
F = 3.2×10^-13 N in positive z direction.
F = 3.2×10 ^-13 •k N
What is the direction and magnitude of the magnetic field B?
The force in a magnetic field is given as
F = q (V ×B)
The only time V×B is zero is when both V and B are in same direction
This shows that B is in the positive x direction or negative x direction
i.e B= Bx •i
Now applying this to the second condition
F= q(V×B)
3.2×10^-13 •k =1.609×10^-19 × (4×10^5•j ×Bx •i)
Note that, j×i =-k
3.2×10^-13 •k / 1.609×10^-19 = (4×10^5Bx •(j×i))
1988812.927 •k =- 4×10^5Bx•k
1988812.927/4×10^5 •k =-Bx •k
4.972 •k =-Bx •k
Then, Bx = -4.972 •k Telsa
Then, the magnitude of B is
B=4.972 T
And its direction is negative z direction.
Answer:
E) The net work done by the two forces is zero joules.
Explanation:
As the elevator is moving at a constant speed, it is the same as being stationary. The tension in the cable perfectly balances the gravitational force. Work done by gravity = mgh
Work done by the tension = -Th
where, T = tension force. The negative sign comes as the direction of T is opposite to the direction of g. As the elevator moves at a constant speed, the magnitude of the two forces must be equal. Therefore, the total work done,
W = (mg - T)h = 0
Answer: The closer the planet is to the sun, the faster it travels
Explanation:
The speed of the planets goes down as the chart shows planets farther away from the sun
