A 20000 kg railroad car is rolling at 1.00 m/s when a 1000 kg load of gravel is suddenly dropped in. part a what is the car's sp
1 answer:
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Answer: Lily, Astrid, Henry, and Bob
Explanation:
By a small online search i've found the image related to this question, and you can see it below.
Joules is a unit of energy, such that:
Joule = kg*m^2/s^2
In other hand, Watt is a unit of power, such that:
1 W = 1 J/s
Then if we measure power, we are measuring watts, which is equivalent to measuring the total amount of energy in joules in a given period of time, and then dividing that by the time. And if we measure energy, we are directly measuring joules.
Then if we measure power or energy, at some point our measures will be in joules (unless we have an specific device to measure power, but these usually exist for electronic systems, not for mechanical/dinamic systems like the ones in the image), this means that all of them will record their measurements in joules, so the correct option is Lily, Astrid, Henry, and Bob
Answer:
Explanation:
Given:
Ratio of lift force to drag force is,
Lift force on a short section is,
Magnitude of resultant,
The angle of 'R' with the horizontal is,
We know that, lift force and drag are at right angles to each other. So, the resultant can be computed using Pythagoras theorem.
For calculating 'R', we first compute drag force 'D'.
As per question:
Now, the magnitude of resultant 'R' is given as:
Plug in the given values and solve for 'R'. This gives,
Therefore, the magnitude of the resultant force 'R' is 64.32 lb.
Now, the angle is given as the arctan of the ratio of the lift and drag force.
Therefore,
Therefore, the angle made with the horizontal is 84.3°.
Answer:
Explanation:
As we know that the rate of heat transfer due to temperature difference is given by the formula
here we know that
A = 4 m x 7 m
thickness = 30 cm
temperature difference is given as
now we have