Answer:
the force on an object is equal to its mass times its acceleration.
Explanation:
the more heavier the object (lawn mower) the more time it will take to cut the grass due to that the tv show will be gone
Answer:
a. Temperatures increase can change a solid to a liquid, but cannot change a liquid to a solid
b. The particles in a solid are much closer together than the particles in a liquid.
Explanation:
Any material expands when heated and contracts when cooled. So, when a body is heated to a particular temperature, it starts melting and changes into a liquid.
As the material expands the distance between the atoms or molecules increases and it will become a liquid. So it can move around the material. It doesn't become solid on further heating. But water is an exception where it contracts when heated from 0° to 4° C.
In solids, these atoms or molecules are closely packed. It is rigidly fixed.
The solid, as well as the liquid, has a definite volume, but the liquid does not have a definite shape.
Answer: Got it!
Explanation: The water in a river flows uniformly at a constant speed of 2.50m/s between two parallel banks 80.0m apart. You are to deliver a package directly across the river, but you can only swim at 1.5m/s.
Spending any length of time in microgravity can weaken bones and shrink muscles. But there are more subtle ways<span> that </span>space travel<span> wreaks havoc on the </span><span>human body</span>
Answer:
Distance = 450 kilometres
Explanation:
Given the following data;
Speed = 90 km/h
Time = 5 hours
To find the distance covered by the train;
Mathematically, the speed of an object or body is given by the formula;
![Speed = \frac {distance}{time}](https://tex.z-dn.net/?f=%20Speed%20%3D%20%5Cfrac%20%7Bdistance%7D%7Btime%7D%20)
Making distance the subject of formula, we have;
Distance = speed * time
Substituting into the formula, we have;
Distance = 90 * 5
Distance = 450 kilometres