The rate of solution is the rate at which a substance dissolves.
the factors on which the rate of solution depends are :
particles area of the solute: greater the area , greater is the rate of solution.
stirring: stirring increases the rate of solution.
temperature: increasing temperature increases the rate of solution.
hence the correct choice is
d) how fast a substance dissolves
Answer:
m = 4.65 kg
Explanation:
As we know that the mass of the water that evaporated out is given as
so the energy released in form of vapor is given as
now the heat required by remaining water to bring it from 15 degree to 100 degree
total heat required for above conversion
now by heat energy balance
heat given by granite = heat absorbed by water
Answer: - 7500N
Explanation:
Given the following :
Initial Velocity of car = 108km/hr
Time taken to stop after applying brakes = 4s
Mass of passengers in car = 1000kg
Force exerted by the brakes on the car =?
After 4s, then final Velocity (V) = 0
Initial Velocity (u) of the car = 108km/hr
108km/hr = (108 × 1000)m ÷ (3600)s = 30m/s
Force exerted = mass(m) × acceleration(a)
Acceleration of car = Change in Velocity with time
a = (v - u) / t
a = (0 - 30) / 4
a = - 30/ 4
a = - 7.5m/s^2
Therefore,
Force exerted = mass(m) × acceleration(a)
Force exerted = 1000kg × (-7.5)m/s^2
Force exerted = - 7500N
Density=m/v so d=22.7/2 which gives you an answer of 11.35
Ideally, if all the magnetic of one winding cuts the other winding, and there isn't any loss in the transformer core or the resistance of the wire, then the voltage across each winding is proportional to the number of turns in its coil.
If you apply 100 V to a winding of 50 turns, then a winding that yields 20 volts
must be wound with
(20/100) of 50 turns = 10 turns
