Answer:
28000 newtons
Explanation:
Force = mass x acceleration
= 7000 * 4
=28000
Unit for force is Newtons
Answer:
move downward
Explanation:
The complete statement of the question is
We fully submerge an irregular 3 kg lump of material in a certain fluid. The fluid that would have been in the space now occupied by the lump has a mass of 2 kg. (a) When we release the lump, does it move upward, move downward, or remain in place
(a)
= Force of buoyancy acting on the irregular lump in upward direction
= mass of irregular lump of material = 3 kg
= mass of fluid displaced = 2 kg
Force of buoyancy on the irregular lump in upward direction is given as the weight of fluid displaced. hence
weight of the irregular lump of material is given as
Since the weight of lump in down direction is greater than the force of buoyancy in upward direction. hence the lump of material moves in down direction
The speed of the star is 255 km/s
Explanation:
The kinetic energy of a body is the energy possessed by the body due to its motion. Mathematically:
where
m is the mass of the object
v is its speed
For the star in this problem, we have:
is the mass
is the kinetic energy
Therefore, the speed of the star is:
Which corresponds to 255 km/s
Learn more about kinetic energy:
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Answer:
(a) You can tell that have the same strength because they have attracted the same amount of paper clips.
(b) Iron is used in electromagnets because steel retained magnetic properties after the power was turned off, but in the iron, the paper clips dropped off right away.