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Fudgin [204]
3 years ago
15

Shani poses as the statue of liberty for an art class. she holds a torch above her head with her right hand and a book against h

er side with her left hand. she holds the pose for ten minutes. at the end of the session, she mentions to her friend that it was a lot of work to pose and that her arms are really tired.which describes the work shani did while she posed?
Physics
1 answer:
kozerog [31]3 years ago
6 0
For Art class, Social Studies class, English class, American History class,
or Photography class, Shani has done an incredible amount of work. 
She'll tell her parents all about it at dinner, and her arms will really ache
when she gets up tomorrow morning.

But it's a different story in Physics class.  In Physics, there is a formal definition
for "work".  (That's so it can be measured, and numerically compared to all forms
of energy.) 

The scientific definition of work is 

                           (force exerted) times (distance moved) .

With this definition, if the force doesn't move through a distance,
then the work done is zero. 

Anything you do without moving, even if it's holding a small car over
your head for an hour while your muscles tremble and sweat pours
down, represents no "work" in the scientific sense.
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Answer:

Angular acceleration, is 708.07\ rad/s^2

Explanation:

Given that,

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We need to find the drill’s angular acceleration. It is given by the rate of change of angular velocity.

\alpha =\dfrac{\omega_f}{t}\\\\\alpha =\dfrac{3030.58\ rad/s}{4.28\ s}\\\\\alpha =708.07\ rad/s^2

So, the drill's angular acceleration is 708.07\ rad/s^2.

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3 years ago
A race car circles 10 times around a circular 8.0-km track in 20 min.
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Find the average speed and the average velocity.

Average speed = distance / time

distance = 10 x 8000 m = 80,000 m
time = 20 min * 60 s/min = 1200 s

Average speed = 80,000 m / 1200 s = 66.67 m/s

Average velocity = displacement / time

Given that the race car made complete circles the final poin is the same initial point, then its displacement is zero and the average velocity is zero too.
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3 years ago
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How does the equivalence principle lead us to suspect that spacetime might be curved?
Dafna11 [192]

Answer:

To understand Einstein's thought processes,

imagine yourself in the sealed box, being accelerated through interplanetary

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table and shine a beam of light perpendicular to the acceleration vector. Since the box is accelerating upward, the path of the light beam

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Fermat's principle, which states that

light travels between two points along a path which minimizes the travel time  required. In a vacuum, where the speed of light is constant, this translates  into the requirement that light takes the shortest path between two points.  In Euclidean, or flat, space, the shortest path between two points is a straight  line. However, in the presence of gravity, the path taken by light is not a  straight line. Thus, Einstein concluded, space is not Euclidean.  The presence of mass, in Einstein's view, causes space to be curved.

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3 years ago
. A car traveling at 30m/s is accelerated uniformly at the rate of 2.5m/s2for 6 sec. What is its final velocity?
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Answer:

45m/s^1

Explanation:

v=u+at

v=(30)+(2.5)(6)

v=45m/s^1

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