Answer:
The correct option is A
Explanation:
Buoyancy can be described as the upward force that causes an object to float on water. <u>When the buoyant force of a liquid is greater than the weight of an object, the object will move to the surface of the liquid and float (because the buoyant force would be able to push it upwards)</u>. If the buoyant force is lesser than the weight of the object, the object will sink (because the buoyant force would not be able to push the object upwards). And when the buoyant force and weight of an object cancel out, the object would be suspended at the depth that this occurs.
Thus, from the explanation above, it can be deduced that for an object to float, buoyant force must be greater than weight of the object. Thus, the correct option is A.
Answer:
If an object is moving with a constant velocity, then by definition it has zero acceleration. So there is no net force acting on the object. The total work done on the object is thus 0 (that's not to say that there isn't work done by individual forces on the object, but the sum is 0 ).
Explanation:
In the middle, when the object was changing position at a constant velocity, the acceleration was 0. This is because the object is no longer changing its velocity and is moving at a constant rate.
Answer:
They give clues about Earth's past environments.
They contain valuable resources used for building.
Explanation:
Answer:
I = 2 [amp]
Explanation:
To solve this problem we must use ohm's law, which tells us that the voltage is equal to the product of the current by the resistance.
The resistances in the diagram are connected in series, in this way the total resistance will be equal to the algebraic sum of the resistivity.
R = R1 + R2
R = 3 + 2
R = 5 [ohm]
Now, using ohm's law we have:
V = I*R
where:
V = voltage = 10 [V]
I = current [amp]
R = resistance = 5 [ohm]
I = V/R
I = 10/5
I = 2 [amp]
I recently did this topic in science class - the answer is A ;)