Answer:
acceleration 8 km/h/s south
Explanation:
First of all, let's remind that a vector quantity is a quantity which has both a magnitude and a direction.
Based on this definition, we can already rule out the following two choices:
distance: 40 km
speed: 40 km/h
Since they only have magnitude, they are not vectors.
Then, the following option:
velocity: 5 km/h north
is wrong, because the car is moving south, not north.
So, the correct choice is
acceleration 8 km/h/s south
In fact, the acceleration can be calculated as
where
v = 40 km/h is the final velocity
u = 0 is the initial velocity
t = 5 s is the time
Substituting,
And since the sign is positive, the direction is the same as the velocity (south).
Answer:
The riders are <u>radially</u> accelerating.
Explanation:
The Ferris wheel is making a circular motion. If it is moving with constant velocity, than the acceleration is
towards the center of the wheel.
So, the riders are subject to a constant and radial acceleration, which is called the centripetal acceleration.
Answer:
The mass of air stored in the vessel is 235.34 kilograms.
Explanation:
Let supossed that air inside pressure vessel is an ideal gas, The density of the air (
), measured in kilograms per cubic meter, is defined by following equation:
(1)
Where:
- Pressure, measured in kilopascals.
- Molar mass, measured in kilomoles per kilogram.
- Ideal gas constant, measured in kilopascal-cubic meters per kilomole-Kelvin.
- Temperature, measured in Kelvin.
If we know that 
, 
, 
and 
, then the density of air is:
The mass of air stored in the vessel is derived from definition of density. That is:
(2)
Where 
is the mass, measured in kilograms.
If we know that and 
, then the mass of air stored in the vessel is:
The mass of air stored in the vessel is 235.34 kilograms.
1,) C
2,) C
Hope this helps
