The formula CO2 is an example of
1 answer:
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Answer:
moving the boxes and the furniture up to the fifth floor.
Explanation:
The work done when moving an object up or down is equal to its change of gravitational potential energy:
where
m is the mass of the object
g is the gravitational acceleration
is the change in height of the object
We have two opposite situations:
1) when an object is moved upward, is positive, so the work done W is positive as well: this means that we need to do work in order to move the object, because we have to "win" the effect of gravity, which pulls the object downward
2) when an object is moved downward, is negative, so the work done W is negative as well: this means that we do not need to do work on the object, because it is already done by gravity, which pulls the object downward.
Therefore, more work is done when we are moving the boxes and the furniture up to the fifth floor.
Answer:
Correct answer letter C.
Explanation:
As we see in this problem, the total linear momentum is conserved, since there are no external forces acting in that system.
So, we can say that or
Now, the initial momentum is zero, because before the person starts climbing, the system (balloon plus person) are floating motionless, therefore we have:
(1)
We know that M > m, therefore, m/M < 1 and using (1) we can deduce that V(balloon) < v(person).
Finally, we can say that the balloon moves down (because of the minus sign of V(balloon)) and its speed is less than v(person). Correct answer letter C.
I hope it helps you!
The mass of the rocket will be 600 kg.In the International System of Units (SI), the kilogram is the unit of mass.
<h3 /><h3>What is mass?</h3>Mass is a numerical measure of inertia, which is a basic feature of all matter. It is, in effect, a body of matter's resistance to a change in speed or position caused by the application of a force.
In the International System of Units (SI), the kilogram is the unit of mass.
The given data in the problem is;
The net constant force is, F= 1500 N
The acceleration is,a=2. 5 m/s²
The mass of the rocket is,m=?
Hence the mass of the rocket will be 600 kg.
To learn more about the mass refer to the link;
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