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topjm [15]
3 years ago
10

What is inertia? (1 point)

Physics
1 answer:
snow_tiger [21]3 years ago
4 0

The answer is C, an objects ability to not change its motion

Hope this helps!

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In most cases, what happens to a liquid when it cools?
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When liquid cools, both its density and volume increases. Therefore the answer to your question are #s 1 and 5. This is due to the fact that molecules which are compacted or pressed against each other form a solid, and when they start to cool-down the molecules start to break free from each other increasing the density of a liquid and the space that it occupies.
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3 years ago
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The air in a room has a mass of 50kg and a specific heat of 1,000 J/(kg.C). What is the change in the thermal energy of the air
dem82 [27]
<span>We know the change of thermal energy is proportional to the specific heat of the matter, its mass and the change of temperatures, according the following formula: Q = C*m*(Tf-Ti) where: Q is the heat added or removed (in joules, J) C is the specific heat of the matter, in our case air 1,000 J/(Kg*C) m is the mass, in our case 50 kg of air Tf is final temperature Ti is initial temperature then: Q = 1000 * 50 * (30-20) = 500,000 Joules That means that 500,000 joules need to be added to increase temperature of the room 10 ÂşC (from 20 to 30 ÂşC)</span>
5 0
4 years ago
A forklift lifts 5 boxes from the ground to a height of 2 meters (m). The boxes push down with a force of 1000 newtons (N). How
Nata [24]
Hello!

Answer:

2000 J

Explanation

Work equation is expressed as:

W=F.d.Cos \alpha

Where:

F: Applied force
d: traveled distance
α: Angle between the direction of the force and the direction of the movement. (in this case, both of the direction are the same, so the angle is 0°)

By substituting:

F=1000N.2m.Cos(0)=2000N.m=2000 J

Have a nice day!
8 0
3 years ago
In February 1955, a paratrooper fell 1200 ft from an
-Dominant- [34]

Answer:

s=1.1107\ m is the minimum depth of snow for survivable stopping.

Explanation:

Given:

  • terminal velocity of fall, u=56\ m.s^{-1}
  • mass of the paratrooper, m=85\ kg
  • force on the paratrooper by the ice to stop him, F=1.2\times 10^5\ N

<u>Firstly, we calculate the deceleration caused in the snow:</u>

a=\frac{F}{m}

a=\frac{120000}{85}

a=1411.765\ m.s^{-2}

Now, using equation of motion:

v^2=u^2+2a.s ....................(1)

where:

v = final velocity of the body after stopping

u = initial velocity of the body just before hitting the snow

a = acceleration of the body in the snow

s = distance through in the snow

Putting respective values in eq. (1)

0^2=56^2+2\times (-1411.765)\times s

s=1.1107\ m

5 0
3 years ago
when a charge of 1 C has an electric PE of 1 J, it has an electric potential of 1 V. When a charge of 2 C has an electric PE of
matrenka [14]
1 volt. 
1/1 = 1
2/2 = 1
7 0
3 years ago
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