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Arlecino [84]
2 years ago
7

Witch of the following is not an appropriate unit for power

Physics
1 answer:
erica [24]2 years ago
6 0

There are no appropriate units for power on the list you provided

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Katie traveled southwest a distance of 4000m on a bicycle in 5400s. What is her velocity?
nlexa [21]
The correct answer would be 1.35m/s sw.
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2 years ago
A grasshopper jumps at a 65.0 degree angle at 5.42m/s. At what time does it reach its maximum height?
crimeas [40]
When the grasshoppers vertical velocity is exactly zero.
v = -g•t + v0.
v: vertical part of velocity. Is zero at maximum height.
g: 9.81
t: time you are looking for
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Find the vertical part of the initial velocity, by using the angle at which the grasshopper jumps.
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3 years ago
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Which statement or phrase best describes the currently accepted model of the atom?
Viktor [21]

Answer:

4

Explanation:

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2 years ago
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Please help me and answer these questions.
jeka57 [31]

Answer:

Answer 2 is iron.

Answer 3 is magnetic induction.

Explanation:

I hope it's helpful!

3 0
2 years ago
A person holding weights sits on a spinning stool. Then the person pulls the weights in,decreasing the rotational inertia of the
velikii [3]

Answer:

Ķ rot = 2K rot

When the arms and weight are retracted toward the body, the energy increases by twice the initial kinetic energy because the moment of inertia has decreased coupled with the energy needed to bring the hands towards the body.

Explanation:

K rot = kinetic energy of system when hands + weight are stretched out = ½ Iw²

Where w = angular velocity when arms and weight are stretched out

I = inertia of the system = ( Ie + Ip) where Ie= moment of inertia of the extra weight carried and Ip = moment of inertia of the person.

Ķ rot = final rotational energy when arms and external weight are pulled in = ½Ìŵ² where Ì =( Ìe + Ìp)

And Ìe = inertia of weight when hands are retracted and Ìp = inertia of person when hand are retracted

Using conservation of angular momentum which is

Iw = Ìŵ

Substitute ŵ = (I/Ì)*W in Ķ rot to give

Ķ rot =½Ì *[ (I/Ì) * W ]²

Ķ rot = ½ ( I²/Ì) * w²

Since K rot = ½ I w²

So Ķ rot = K rot ( I/Ì )...eq3

From the question above system inertia reduces by a factor of 2

Ì = ½I

Sub expression into equ3

Ķ rot = 2K rot

4 0
3 years ago
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