Answer:
In most materials, as heat energy is absorbed, the density decreases. IF a certain object is heated, it might appear bigger than usual because it expands as the molecules inside moves faster than usual. However the mass of it stays the same while the density decreases.
Stop using it all the time for some useless things.
Answer:
middle ear has three bones! the hammer, anvil, stirrup, and ear drum
Explanation:
Answer:
21/5 seconds or 4.2 seconds
Explanation:
Distance=Speed*Time
21=5 *Time
21/5=Time
4.2=time
Work done = force x distance (where the force is in the direction of the distance travelled)
We must resolve the force so that it is horizontal to the ground
force = 75cos45
Then simply plug into the formula, so:
work done = 75cos45 x 15 = 795.49... Nm = 795 Nm (3 sig. fig.)
