A. how much work is done by friction as the sled moves
30.0 m along the hill
We use the formula:
friction work = -µmgdcosΘ
friction work = -0.100 * 90 kg * 9.8 m/s^2 * 30 m * cos 60
friction work = - 1,323 J
B. how much work is done by the rope on the sled in
this distance?
We use the formula:
rope work = -mgd(sinΘ - µcosΘ) <span>
</span>rope work = - 90 kg * 9.8 m/s^2
* 30 m (sin 60 – 0.100 * cos 60)
rope work = 21,592 J
C. what is the work done by the gravitational force on
the sled?
We use the formula:
gravity work = mgdsinΘ
gravity work = 90 kg * 9.8 m/s^2 * 30 m * sin 60
gravity work = 22,915 J
D. what is the total work done?
We add everything:
total work = - 1,323 J + 21,592 J + 22,915 J
<span>total work = 43,184 J</span>
Answer:
6787.5 V
Explanation:
From the question,
P = IV..................... Equation 1
Where P = Power, I = rms current, V = rms voltage.
make V the subject of the equation
V = P/I................. Equation 2
Given: P = 1500 W, I = 6.4/√2 = 4.525 A
Substitute these values into equation 2
V = 1500(4.525)
V = 6787.5 V
Hence the rms voltage = 6787.5 V
Answer: The correct answer is D.
Explanation:
Momentum is defined as the product of the mass and the velocity.
To have more momentum, there should be both mass and the velocity.
If the object has more mass as compared to the object having lighter mass and the heavier mass object is standing still and lighter one is moving then the lighter object will have more momentum.
In the given problem, if the elephant is still standing but an ant is moving then an ant will have more momentum than an elephant.
Therefore, the correct answer is D.
Well that is b/c the atmosphere and environment is the same. like for example you know how its not easy to maneuver its similar to space. another thing is the supply you need in water is similar to space you need oxygen tanks for both