Answer:
we know,
Power=work done\time taken
=10\2
=5 watt
use of crowbar
It is used as a lever either to force apart two objects or to remove nails. Crowbars are commonly used to open nailed wooden crates. Common uses for larger crowbars are: removing nails, prying apart boards, and generally breaking things.
use of wheel barrow
Wheelbarrows are used for a variety of things, such as moving rock, mulch or compost to the garden, moving trees or large shrubs from one spot to another, hauling bricks, disposing of garden debris, or even for mixing concrete or fertilizers.
Answer:
14 atoms
Explanation:
Number of atoms in Fe₂(CO₃)₃
An atom is the smallest indivisible particle that takes part in a chemical reaction.
In Fe₂(CO₃)₃; we have:
Elements Number of atoms
Fe 2
C 3
O 3(3) = 9
Total number of atoms = 2 + 3 + 9 = 14 atoms
Answer:
D.velocity
Explanation:
When unbalanced forces are applied to a moving bike along the direction its moving, the velocity of the bike changes.
Unbalanced forces causes a body to accelerate. Acceleration is the rate of change of velocity with time.
When unbalanced forces acts on a body, the velocity changes.
- An unbalanced force is a force whose resultant is not zero.
- Such a force causes a body to change motion and then acceleration.
- For a body to accelerate, the velocity must change per unit of time.