The answer is <span>moving pulleys are attached to the object and move with the object. Fixed-position pulleys are connected to a fixed point and do not move</span>
Ek = 1/2 m v^2
Ek = 1/2 × 60 × 2^2
Ek = 1/2 × 60 × 4
Ek = 120 J
the kinectic energy is 120 J
Answer:
<em>216.7 ml</em>
Explanation:
<u>Concentration</u>
The concentration of a substance is defined as the quantity of solute existent in a given quantity of solution. Water is usually a liquid to add to the solute and produce the substance with the required concentration, often expressed in %, gr/ml or any other similar ratio. If the solute is expressed in units of mass and the solution is expressed in units of volume, then the concentration is known as mass concentration or density and is computed as
Where is the mass of solute and is the total volume of the solution
We know at first
Operating
When we add 50 ml of water and keep the solute unchanged, we have
Or equivalently
Equating both masses
Rearranging and simplifying
Solving
The mass of the solute is
We don't know the density of the solute, so we cannot compute its volume which is part of the solution. If we neglect this volume because the concentration is small enough, we can say there were 216.7 ml of water in the initial solution.
If we estimate the density of the solute close to 1 gr/ml, the volume is 17.3 ml, and the initial volume of water in the solution is 216.7-17-3=199.4 ml
Answer:
42 feet
Explanation:
85mph
120 seconds
60 seconds in one minute
3600 seconds in one hour
3600 seconds ÷ 85mph = 42 feet
the answer is earth for the first one and sun for the second one