I think it is C. 12 units please tell me if im wrong
Answer:
The answer to your question is Vr = 2.83 m, to the Northwest
Explanation:
Data
Vector A = 5 m
Vector B = 2.0 m
Vector C = 7.0 m
Process
1.- Calculate the ∑Vx and ∑Vy
∑Vx = 5m - 7m = -2m Vectors substract because they are in opposite directions
∑Vy = 2m
2.- Calculate the resultant vector with the Pythagorean theorem
Vr² = Vx² + Vy²
Vr² = (-2)² + (2)²
Vr² = 4 + 4
Vr² = 8
Vr = 2.83 m
3.- Calculate the direction
tan Ф = 2/-2 = 1
tan⁻¹Ф = 45° to the Northwest
5.5 hours. In order to get this answer you divide 137.5 by 25. Hope this helps :)
Answer:
H1 = 63.3 kJ
Explanation:
Given:
ΔL = 2.256 kJ/g
Cp = 4190J/kg⋅K
Steam at 100°C in contact with your skin, condenses to water at 100°C. Therefore,
Q = M × ΔL
= (25.0 g)(2.256 kJ/g)
= 56.4 kJ
This condensed water at 100°C is then cooled to 34°C. The heat involved with this temperature change is;
Q = m × Cp × ΔT
= (25 × 1kg/1000g × 4190 × (100°C - 34°C)
= 6913.5 J
= 6.914 kJ
The total heat H1,
= (56.4 kJ) + (6.9135 kJ)
= 63.3 kJ.
