An 114 kg man climbs up a 1 m high flight of stairs. The acceleration of gravity is 9.81 m/s 2 . What is the increase in the gra
1 answer:
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Answer:
I1 < I2
V1 > V2
Explanation:
Let the EMF of both the batteries is E and the internal resistance of both the cells is r.
The relation between the current and the EMF is given by
where, R be the resistance connected in the circuit.
the relation between the terminal potential difference and the EMF is given by
V = E - Ir
where, V is the terminal potential difference
If R1 is connected,
The current is given by
.... (1)
The terminal potential difference is given by
..... (2)
If R2 is connected,
The current is given by
.... (3)
The terminal potential difference is given by
..... (4)
As given in the question, R2 > R1
So, by the equation (1) and (3), we get
I1 < I2
and by the equation (2) and (4) ,we get
V1 > V2
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
Kinetic energy =
1/2 * 50 * v^2 = 18000
v^2 = 720
v = 26.8 m/s
1/2 * 50 * v^2 = 18000
v^2 = 720
v = 26.8 m/s