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Citrus2011 [14]
3 years ago
9

A boy throws a ball and accidentally breaks a window. The momentum of the ball and all the pieces of glass taken together after

the collision is ________ the momentum of the ball before the collision. The momentum can not be determined from the information given. greater than the same as
Physics
1 answer:
Shkiper50 [21]3 years ago
3 0
When a boy throws a ball and accidentally breaks a window, the momentum of the ball and all the pieces of glass taken together after the collision is THE SAME as the momentum of the ball before the collision
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Newtons first law states that objects in motion stays in motion until an unbalanced force is acted upon it. what do you think th
EleoNora [17]
Hi Spycn2115


Newton's first law states that objects in motion stay in motion until an unbalanced force is acted upon it is a good fact. When I first personally heard of it in class I had no clue but when I researched it I learned that one good example of this would be those cradle balls and if u swing it, it will keep constantly hitting each other back and fourth over and over until someone grabs it and stops it, so that's what objects in motion stays in motion until an unbalanced force is acted upon it means, because the balls are in motion by moving left to right constantly and its staying in motion by not stopping and that unbalanced force is someone or something maybe hitting it or knocking it over could stop it, balanced means staying still and equal, unbalanced means unstill so moving, the cradle balls are KE and PE, (Kinect and potential energy) because kinetic means moving, so the balls are moving, and potential means stored up, so before u even swing u have the potential energy to swing it different ways before it becomes kinetic. That's one of my favorite examples of Newton's first law and I left you a pic below of cradle balls to help you get the idea.

8 0
3 years ago
A machine that changes only the direction of a force has a mechanical advantage of
8090 [49]

Answer:

1

Explanation:

The word "only"= one!

5 0
3 years ago
Read 2 more answers
An object is in uniform circular motion, tracing an angel at 30 degrees every 0.010 seconds. What's the period of this motion an
Neko [114]
Here's the rule you need to know
in order to answer this question:

                     1 full circle ==> 360 degrees .

Got that ?

Now you could set up a proportion:

     (30 degrees) / (0.01 second)  =  (360 degrees) / (time for full period)

Cross-multiply the proportion:

     (30°) · (period)  =  (360°) · (0.01 sec)

Divide each side by (30°) :    Period = (360° · 0.01 sec) / (30°)

                                                     =  (3.6° · sec) / (30°)

                                                     =  (3.6 / 30)  sec

                                                     =      0.12  sec .
___________________________________

Another way to look at it:

30°        takes    0.01 second
60°        takes    0.02 second
90°        takes    0.03 second
120°      takes    0.04 second
150°      takes    0.05 second
180°      takes    0.06 second
210°      takes    0.07 second
240°      takes    0.08 second
270°      takes    0.09 second
300°      takes    0.10 second
330°      takes    0.11 second
360°      takes   0.12 second

7 0
4 years ago
A motor does 20. joules of work on a block, accelerating the block vertically upward. Neglecting friction, if the gravitational
Eva8 [605]
The motor does 20 J of work on the block, it means that the total mechanical energy of the block has increased by 20 J. But the increase in total mechanical energy is equal to the sum of the increases in potential energy and kinetic energy:
\Delta E = \Delta U + \Delta K
So, if the gravitational potential energy has increased by 15 J, the kinetic energy has increased by
\Delta K = \Delta E - \Delta U = 20 J - 15 J= 5 J
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3 years ago
For the past few days, the weather in Miami has been cool. When the temperature did warm up, the meteorologists noticed that it
Jet001 [13]
Winds transfer energy in the form heat from the air to the ground!
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