100g of water at 25°C is poured into an insulating cup. 50g of ice at 0°C is added to the water. The water is stirred until the temperature of the water has fallen to 0°C.
18g of ice remains unmelted.
The specific heat capacity of water is 4.2 J/gºC.
Which value does this experiment give for the specific latent heat of fusion of ice?
А.
210J/g
B 330 J/g
C 580 J/g
D 770J/g
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Explain the consequences of this addiction to the brain tissue

What is the rate of 12 liters of water moving through a water hose in 4.0 minutes?

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".