The air temperature is 70 degrees, and the relative humidity is 90%. Which conclusion can be made?(1 point)The air holds little water vapor and is relatively dry.
The amount of water vapor in the air is 90% of what the air can hold.
The dew point temperature is 90% of the air temperature.
The temperature must rise in order for air to become saturated with water vapor.
Answers
Answer:
The amount of water vapor in the air is 90% of what the air can hold.
Explanation:
The answer is A
Answer: The answer is B: The amount of water vapor in the air is 90% of what the air can hold
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A car that travels from point A to point B in four hours, and then from point B back to point A in six hours. The road between point A and point B is perfectly straight, and the distance between the two points is 240 km. What is the car’s average velocity?
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40 x 15 = 600 is the answer you want
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Before slowing down, the car's speed is 25 m/s,
and its kinetic energy is ...
(1/2) (1,500 kg) (25 m/s)²
= (1/2) (1,500 kg) (625 m²/s²)
= 468,750 joules .
After slowing down, the car's speed is 15 m/s,
and its kinetic energy is ...
(1/2) (1,500 kg) (15 m/s)²
= (1/2) (1,500 kg) (225 m²/s²)
= 168,750 joules.
The car lost (468,750 - 168,750) = 300,000 joules of K.E.
The law of Conservation of Energy says:
That 300,000 joules had to go somewhere.
If it's a standard, gas-powered car, then the kinetic energy got
put into the brakes. The energy turned into heat, and the heat
was carried off in the air.
If it's a more modern electric or hybrid car, then the kinetic energy
spun the wheel motors, turning them temporarily into electrical
generators. The generators converted the kinetic energy into
electrical energy, which got put back into the car's batteries, and
could be used again. That's why electric cars use less gas.
Answer:
Kinetic energy = (1/2) (mass) (speed)²
Before slowing down, the car's speed is 25 m/s,
and its kinetic energy is ...
(1/2) (1,500 kg) (25 m/s)²
= (1/2) (1,500 kg) (625 m²/s²)
= 468,750 joules .
After slowing down, the car's speed is 15 m/s,
(1/2) (1,500 kg) (15 m/s)²
= (1/2) (1,500 kg) (225 m²/s²)
= 168,750 joules.
The car lost (468,750 - 168,750) = 300,000 joules
and you heard it from the KING
4.00 m/s
0.400 m/s
0.0400 m/s
I will report you if you give a cruddy answer - please explain!
Answers
Okay so we need to bring a couple of equations into this
First E =F/q
We have our q and E lets solve for F
F = Eq
So remember th equation
F = qV x B
F = qVBsin(Ф)
The angle is perpendicular so
sin(90) = 1
F = qVB
Solve for V
F/qB = V
Eq/qB = V
Look at that the charges cancel out!
V = E/B
(Fun fact: Thats what they use in mass spectrometers which is why it says the particle should travel in a straight line)
Anyways lets solve this!
V = 2/5
V = 0.4 m/s
there are 2 forces acting on the particle: magnetic n electric force
the 2 forces must be equal 4 it to travel in a straight line
as it has +1C charge, q, the charge is dropped in the following:
magnetic force = qv x B where v is velocity n B is magnetic field;
x represents cross-product which in this case of 90-deg. is same as multiply
magnet force = v*5
electric force = qE where E is electric field
= 2
as magnet force = electric force
v*5 = 2
v=2/5=0.400m/s