PHYSICS HIGH SCHOOL

If a ball is rolling with 5 pounds of force, how much force will be needed to stop the ball from rolling and why? A It would take 25 pounds of force to stop the ball from rolling becae it takes five times as much force to stop as object. B It would take 2.5 pounds of force to stop the ball from rolling becae it takes half of the amount of force to stop an object. C It would take 10 pounds of force to stop the ball from rolling becae it takes double the amount of force to stop an object. D It would take 5 pounds of force to stop the ball from rolling becae the same amount of force mt be ed to stop the object.

Answers

Answer 1
Answer: The answer is D, have a good day

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What are the two factors affect the weight of an object?
what are some sources of error that could explain differences between your prediction and what you measured experimentally for sound speed
The earth system concept emphasizes which of the following? Question 2 options: how everything on the earth is interconnected how you can study each system in isolation the concept that the earth is round how the earth's systems came about
Why does the weight of water pulls the central part of the surface down?
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Which of these objects would show the greatest parallax?a. the Sun
b. Mars
c. the Moon
d. Polaris
What is the distance an object would be from Earth if its parallax were one arcsecond?
a. a parsec
b. a light-year
c. an arcminute
d. an angular diameter

Answers

The sun's parallax would be 180 degrees, greater than which you can't get.

If an object exhibits a parallax of 1 arc second, then its distance from us
is called one 'parsec'.  That distance is about  3.26 light-years.

Suppose that you hear a clap of thunder 16.2 s (seconds) after seeing the associated lightning stroke. The speed of sound waves in air is 343 m/s and the speed of light in air is 3.00*10^8 m/s. How far are you from the lightning stroke?

Answers

since the speed of sound is very high, we consider the time period of thunder and lightening negligible.

Now, d = vt

thus, d = 343 x 16.2

thus, d = 5556.6 metres

Thus, we are 5556.6 metres away from lightening ( approximately)

Fossil fuels currently account for the majority of the world’s energy use because they are A. renewable energy resources. B. distributed evenly throughout the world. C. relatively inexpensive and readily available. D. nonpolluting.

Answers

The answer to your question will be C. because they are very inexpensive and are readily available but they will eventually deplete because we use them faster than they can be produced we use what has been building up.

A bicycle is heading west. It goes 500m in 5 minutes. What is its velocity?

Answers

Speed = 500m/5min = 100 m/min. Direction = west. Velocity = 100 m/min west.
Velocity = distance\time

500/(5*60)

=500
------
300 m/s west.

A balloon drifts 140m toward the west in 45s ; then the wind suddenly changes and the balloon flies 90m toward the east in the next 25s. What distance did it travel during the first 45s?

Answers

Answer: 140 m

Explanation:

Let's begin by stating clear that motiont is the change of position of a body at a certain time. So, during this motion, the balloon will have a trajectory and a displacement, being both different:

The trajectory is the path followed by the body, the distance it travelled (is a scalar quantity).  

The displacement is the distance in a straight line between the initial and final position (is a vector quantity).  

So, according to this, the distance the balloon traveled during the first 45 s (its trajectory) is 140 m.

But, if we talk about displacement, we have to draw a straight line between the initial position of the balloon (point 0) to its final position (point 90 m).  Being its displacement 95 m.

If you throw a 0.25-kg ball with a force of 20N what's the acceleration of the ball

Answers

F=ma
20=0.25*a
a=20/0.25
a=80 m/s2
F=ma
F/m=a
then a=Fm
a=20 x 0.25
a=5 m/s²
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