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3 years ago

Which of the following describes work?

2 answers:

7 0

I believe the correct answer from the choices listed above is option C. Work is when force acts on an object and causes a displacement of that object. Work is calculated by multiplying force applied on an object and the distance it traveled. Hope this answers the question.

olga2289 [7]3 years ago

4 0

C. Force causes displacement

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A net force of 10 N accelerates an object at 5.0 m/s^2. What is the mass of the object? A. 2 kg B. 10 kg C. 5 kg D. 20 kg

Ludmilka [50]

Answer:

A. 2 kg

Explanation:

$Force = 10N\\Acceleration = 5.0m/s^2\\Mass = ? = x\\Force = mass\times acceleration \\10 = x \times 5\\10 = 5x \\\frac{10}{5} =\frac{5x}{5} \\2=x\\\\Mass= 2kg$

7 0

3 years ago

A dwarf planet discovered out beyond the orbit of Pluto is known to have an orbital period of 619.36 years. What is its average

Maksim231197 [3]

Answer: $72.66 AU=1.089(10)^{10} km$

Explanation:

Let's begin by explaining that according to Kepler’s Third Law of Planetary motion “The square of the orbital period $T$ of a planet is proportional to the cube of the semi-major axis $a$ of its orbit”:

$T^{2}\propto a^{3}$ (1)

Now, if $T$ is measured in years (Earth years), and $a$ is measured in astronomical units (equivalent to the distance between the Sun and the Earth: $1AU=1.5(10)^{8}km$ ), equation (1) becomes:

$T^{2}=a^{3}$ (2)

So, knowing $T=619.36 years$ and isolating $a$ from (2) we have:

$a=\sqrt[3]{T^{2}}$ (3)

$a=\sqrt[3]{(619.36 years)^{2}}$ (4)

Finally:

$a=72.66 AU$ T his is the distance between the dwarf planet and the Sun in astronomical units

Converting this to kilometers, we have:

$a=72.66 AU \frac{1.5(10)^{8}km}{1 AU}=1.089(10)^{10} km$

4 0

3 years ago

___ is produced when grains of quartz in sandstone are welded together when the rock is subjected to high temperatures.

Galina-37 [17]

Quartzite is produced when grains of quartz in sandstone are welded together when the rock is subjected to high temperatures. Quartzite or Quarzit is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone. It is formed when a quartz-rich sandstone is altered by the heat, pressure,

3 0

3 years ago

Transverse waves are sent along a 4.50 m long string with a speed of 85.00 m/s. The string is under a tension of 20.00 N. What i

frutty [35]

Answer:

m = 0.0125 kg

Explanation:

Let us apply the formula for the speed of a wave on a string that is under tension:

$v = \sqrt{\frac{F}{\mu} }$