When a warm air mass and a cold air mass collide, you get a front. Remember how low-pressure warm air rises and cold high-pressure air moves into its place? The same reaction happens here, except the two forces slam into each other. The cold air forms a wedge underneath the warm air, allowing it to basically ride up into the troposphere on its back and generate rain clouds. There are four main kinds of fronts, classified by airflow momentum. In a warm front, a warm air mass moves into a cold air mass. In a cold front, the opposite occurs. In a stationary front, neither air mass advances. Think of it as two fronts bumping into each other by accident. In an occluded front, a cold front overtakes a moving warm front, like an army swarming over a fleeing enemy.
(a) The electrical resistance of the wire is determined as 9.27 x 10⁻⁴ ohms.
(b) The current flowing through the wire is 1.1 mA.
<h3>
Electrical resistance of the wire</h3>
The electrical resistance of the wire is determined as follows;
ρ = RA/l
RA = ρL
R = ρL/A
Where;
- A is area of the iron bar
- ρ is electrical resistivity = 1/conductivity = 1/1.0299 x 10⁷ = 9.7 x 10⁻⁸
A = πd²/4
A = π x (0.02)²/4
A = 3.14 x 10⁻⁴ m²
R = (9.7 x 10⁻⁸ x 3)/(3.14 x 10⁻⁴)
R = 9.27 x 10⁻⁴ ohms
<h3>From the chart, voltage after 120 minutes ≈ 1.1 V</h3>
Current, I = V/R
where;
I = 1.1/(1000)
I = 1.1 mA
Learn more about resistance here: brainly.com/question/17563681
#SPJ1
The resultant vector is 5.2 cm at a direction of 12⁰ west of north.
<h3>
Resultant of the two vectors</h3>
The resultant of the two vectors is calculated as follows;
R = a² + b² - 2ab cos(θ)
where;
- θ is the angle between the two vectors = 45° + (90 - 57) = 78⁰
- a is the first vector
- b is the second vector
R² = (3.7)² + (4.5)² - (2 x 3.7 x 4.5) cos(78)
R² = 27.02
R = 5.2 cm
<h3>Direction of the vector</h3>
θ = 90 - 78⁰
θ = 12⁰
Thus, the resultant vector is 5.2 cm at a direction of 12⁰ west of north.
Learn more about resultant vector here: brainly.com/question/28047791
#SPJ1
Explanation:
It is given that,
Wavelength 1,
Wavelength 2,
Energy of a photon having wavelength 1 is given by :
Energy of a photon having wavelength 2 is given by :
Hence, this is the required solution.
Answer:
D
Explanation:
Whether endothermic or exothermic, for a reaction to be spontaneous, ∆G must be negative.
∆G=∆H-T∆S.
The values of temperature and entropy change can be determined when the values of enthalpy, entropy and temperature are known. When ∆G is zero, the reaction has attained equilibrium.