Answer:
55,42 J
Explanation:
Since the height of the room is 3.45 m (distance between the floor and the ceiling) the difference between this value and the length of the rope 1.19 m; it will be equal to (3.45-1.19) =2.26 m. If we take as a reference point (Ep=0) the floor of the room, then the potential energy will be equal to Ep = M * g * h, replacing values in this equation (2.5 kg * 9.81 m/s2 * 2.26 m) will be 55,42 (N * m) or Jules.
The density is 4.76 gcm^-3
and if mass is in kg then density is equal to 4.76*10^-3
Speed = wavelength × frequency
speed = 10/1000 × 5.0
speed = 0.001 × 5.0
speed = 0.005m/s
The whole secret of things that are balanced on a pivot like this is:
The sum of all of the 'moments' is equal on both sides.
The moment of each weight is (the weight) times (its distance from the pivot).
If you add up those for each eight on one side, it has to be equal to the sum
of all the ones on the other side.
<u>2. a).</u>
The moments on the right side are: (4 x 0.15) and (1 x 0.40).
They add up to (0.60 + 0.40) = 1.00
The only moment on the left side is (C x 0.25). Both sides have to be equal.
C x 0.25 = 1.00
Divide each side by 0.25, and you have C = 4 N .
===========================================
<u>2. b).</u>
The only moment on the left side is (5 x 0.40) = 2.00
The moments on the right side are (1 x 0.20) and (D x 0.30)
They add up to (0.3D + 0.2).
Both sides have to be equal. 0.3D + 0.2 = 2.0
Subtract 0.2 from each side: 0.3D = 1.8
Divide each side by 0.3: D = 6 N
<h3><u>Answer;</u></h3>
A compound which is a pure substance
<h3><u>Explanation;</u></h3>
- <em><u>A pure substance is a substance with a definite and constant composition and distinct chemical properties. Pure substance can either be a compound or an element.</u></em>
- <em><u>Compound is a substance made of two or more elements that can be broken down by chemical means. therefore, Chemical reaction is the only way to separate a compound into its elements</u></em>
- Element on the other hand is a pure substance that is composed of only one type of atom. Unlike compounds pure substances can not be broken down by chemical means.
