Ans:
a = 9i + 12j
b = 3i + 4j
Explanation:
We have two equations:
<span>a - b = 2c --- (A)
</span><span>a + b = 4c --- (B)
and two unknowns:
a = ?
b = ?
Whereas,
c = 3i + 4j
Add equations (A) and (B):
=> a - b = 2c
a + b = 4c
----------------------
2a = 6c
=> a = 3c --- (C)
Put the value of vector c in equation (C):
(C) => a = 3(3i + 4j)
=> a = 9i + 12j
Now that we have vector a, put that vector and vector c in equation (A):
(A)=> (9i + 12j) - b = 2(3i + 4j)
=> b = (9i + 12) - (6i + 8j)
=> b = 3i + 4j
Ans:
a = </span>9i + 12j
b = 3i + 4j<span>
</span>
Answer:
Because of the presence of air resistance
Explanation:
When an object is in free fall, ideally there is only one force acting on it:
- The force of gravity, W = mg, that pushes the object downward (m= mass of the object, g = acceleration of gravity)
However, this is true only in absence of air (so, in a vacuum). When air is present, it exerts a frictional force on the object (called air resistance) with upward direction (opposite to the motion of free fall) and whose magnitude is proportional to the speed of the object.
Therefore, it turns out that as the object falls, its speed increases, and therefore the air resistance acting against it increases too; as a result, the at some point the air resistance becomes equal (in magnitude) to the force of gravity: when this happens, the net acceleration of the object becomes zero, and so the speed of the object does not increase anymore. This speed reached by the object is called terminal velocity.
Answer:
Change in the shape size volume and state of a substance
When a solid is heated, it turns into a liquid. As a liquid, a substance has a fixed volume, but its shape changes to fill the shape of its container. For instance, a glass of water is the liquid state of water. ... Gas expands to fill the shape and volume of its container.
Explanation:
Answer:
translation
Explanation:
If a ball has an approximate mass of 0.5 kg, with what force must be kicked to give it an acceleration of 1.5m / s2?
Answer:
This all simply due to the size of the two water bodies question and the your body size in a bath tub the water is small enough to allow the upthrust displace water out if the tub whereas in a lake the water is bigger and your body size is smaller to allow any noticeable upthrust that would cause an overflow
