The stone's altitude at time is given by
where is the acceleration due to gravity. The stone reaches the ground when
:
Sarah plans to go on an outing with her friends. On Saturday morning, the sky was cloudy and Sarah's barometer indicated that th
1 answer:
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I found some missing information about this problem online. We are given the force:
Power is defined as the rate of doing work.
This is the formula:
Where P is power, W is work.
Work is defined as:
F is the force and r is the displacement.
If we assume that force is not changing (it's constant) with time we get:
Keep in mind that both force and velocity are vectors, so we have to multiply each component separately.
Finally, we get:
Power is defined as the rate of doing work.
This is the formula:
Where P is power, W is work.
Work is defined as:
F is the force and r is the displacement.
If we assume that force is not changing (it's constant) with time we get:
Keep in mind that both force and velocity are vectors, so we have to multiply each component separately.
Finally, we get:
Answer:
To obtain the power, we first need to find the work made by the force.
1) To calculate the work, we need the next equation:
So the force is given by the problem so our mission is to find 'dx' in terms of 't'
2) we know that:
So we have:
Then:
3) Finally, we replace everything:
After some calculation, we have as a result that the work is:
161.9638 J.
4) To calculate the power we need the next equation:
So
P = 161.9638/4.7 = 34.46 W
Answer:
Length of copper wire, l = 785 meters
Explanation:
Given that,
Resistance of the copper wire, R = 0.172 ohms
Area of cross section,
Resistivity of copper,
The resistance of a wire is given by :
l = 785 meters
So, the length of the copper wire is 785 meters. Hence, this is the required solution.