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SpyIntel [72]
3 years ago
7

A 10 N force is used to push a 30 kg box across the floor, moving it a distance of 20 m. There is no friction. What is the magni

tude of work done on the box?
A. 2 J

B. 10 J

C. 30 J

D. 200 J
Physics
1 answer:
tekilochka [14]3 years ago
5 0
Work=Force • Distance
W= 10N • 20m
W= 200 J

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Inertia causes bodies to slow in their motion, unless they’re pushed by a force.
postnew [5]

Answer:

ill go with B

Explanation:

inertia is the ability of a body to remain at rest or in a constant speed in a constant direction when no force is acting on it

4 0
2 years ago
1. Suppose you have a metal bar. Its mass is 57.9g and its volume is 3cm'. What is its<br> density?
mariarad [96]

¡Hellow!

How we know, for calculate density, we can use the formule:

                                               \boxed{\textbf{p = m / v} }

<u>Where:</u>

\sqrt{ p = Density = ?

\sqrt{ m = Mass = 57,9 g

\sqrt{ v = Volume = 3 cm³

Let's replace according we information:

p = 57,9 g / 3 cm³

p = 19,3 g/cm³

The density of the metal bar is <u>19,3 g/cm³.</u>

<u></u>

¿Good luck?

3 0
3 years ago
A 1 kg object can be accelerated at 10 m/s^2. If you apply this same force to a 4kg object, what will its acceleration be?
AleksAgata [21]

Answer:

a2 = 2.5~m/s^2

Explanation:

<u>Mechanical Force</u>

According to the second Newton's law, the net force F exerted by an external agent on an object of mass m is:

F = m.a

Where a is the acceleration of the object.

Assume we apply some given force F to an object of m1=1 Kg that produces an acceleration a1=10 m/s^2, then:

F = m1.a1

The same force F is now applied to a second object m2=4 Kg that produces an acceleration a2, then:

F = m2.a2

Dividing both equations:

\displaystyle 1=\frac{m1.a1}{m2.a2}

Solving for a2:

\displaystyle a2=\frac{m1.a1}{m2}

Substituting values:

\displaystyle a2=\frac{1*10}{4}

a2 = 2.5~m/s^2

7 0
3 years ago
find the rate of positive acceleration of an automobile which went from a complete stop to a velocity of 30 meters per second in
maks197457 [2]

Answer:

3 m/s^2

Explanation:

acceleration= Change in velocity/time

= 30-0 / 10

= 30/10

=3 m/s^2

3 0
3 years ago
When objects are heated they tend to expand because
densk [106]
Hello!
===
When objects are heated, their molecules tend to vibrate fast. As they vibrate, the space between each atom increases. This keeps on happening, and the object expands until it has cooled down.
===
Hope this helps! :)
5 0
3 years ago
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