Answer:
4202.4 J
Explanation:
The formula for calculating the heat absorbed by ice to melt into water is given by :
ΔH = Cp × m × Δ T -------where ;
Cp =specific heat of ice = 2.06 J/g° C
m= mass of ice = 102 g
ΔT = 0°C--20°C = 20°C
Thermal energy absorbed by the ice will be;
ΔH = Cp × m × Δ T
ΔH = 2.06 * 102 * 20
ΔH =4202.4 J
The person is standing on the floor of the elevator, and he isn't
floating up or smashing through the floor.
So the person's acceleration is exactly the same as the elevator's
acceleration.
Now, Newton's second law of motion says:
F = M · a
(the net force on the person) = (the person's mass) x (his acceleration)
Net force = (80 kg) x (0.5 m/s²)
= 40 newtons .
Answer:
The left side of the equation i.e ∆p=MVo should be used
Explanation:
Momentum is the product of mass and velocity or the quantity of motion an object has.
Impulse is the change in momentum
If P is the momentum
If M is the mass of the object
Vo is the velocity of the object
∆p=P2-P1
Since the wall is stationary, P1 = 0
The momentum of the object itself is P2
Therefore, ∆p=P2
Since P2=MVo
∆p=MVo
Answer:
880 kg / m^3
Explanation:
height of column of oil = 85 cm = 0.85 m
height of column of mercury = 5.5 cm = 0.055 m
Density of mercury = 13600 kg/m^2
Let teh density of oil is d.
A the height of mercury column is balanced by the height of oil column
So, the pressure due to the mercury column = pressure by teh oil column
height of mercury column x density of mercury x g = height of oil column
x density of oil x g
0.055 x 13600 x g = 0.85 x d x g
748 = 0.85 d
d = 880 kg / m^3