answer
77.25 N
explanation
(look at picture for free body diagram)
the force on the piano has both vertical and horizontal components, and since the questions asks about the force to lift the piano, we want to find the vertical component
we can use trigonometry where sinA = opposite/hypotenuse
A = 18 degrees
hypotenuse = 250 N
sin18 = opposite (vertical component) / 250
vertical component = sin18 * 250
= 77.25 N
Answer:
a. Glass is denser than wood.
Explanation:
Density=Mass/volume
In this case we know that mass of glass is greater than wood. And the volume of both glass and wood are the same, so we will ignore that factor. Since mass is directly proportional to density, if your mass increase, your density increases as well, in this case.
Answer:
In physics, a force is an influence that can change the motion of an object. A force can cause an object with mass to change its velocity (e.g. moving from a state of rest), i.e., to accelerate. ... A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newton (N).
Let's see..
- Melting
-Evaporation.
Two.
