Answer:
1) 50 seconds 2) 100°C
Explanation:
(Follows formula of Power=Energy/Time)
1) 500W x X = 2000J/kg°C x .25kg x 50°C
X = 50 seconds.
2) 2000W x 300s = 1000J/kg°C x 2kg x X
X = 300
Initial temperature => 400°C-300°C = 100°C
Answer:
Explanation:
The Law of Momentum Conservation for us has the equation
![[m_rv_r+m_gv_g]_b=[m_rv_r+m_gv_g]_a](https://tex.z-dn.net/?f=%5Bm_rv_r%2Bm_gv_g%5D_b%3D%5Bm_rv_r%2Bm_gv_g%5D_a)
and filling in:
![[(.50)(5.0)+(.50)(0)]=[(.50)(2.0)+(.50)v_g]](https://tex.z-dn.net/?f=%5B%28.50%29%285.0%29%2B%28.50%29%280%29%5D%3D%5B%28.50%29%282.0%29%2B%28.50%29v_g%5D)
and
2.5 = 1.0 + .50v and
1.5 = .50v so
v = 3 m/s
The answer would be B. Freezing water breaks apart a rock
Answer: New temperature T2 = 9.66°C
Explanation:
Given;
Energy added ∆E = 20J
Initial temperature T1 = 0°C
Number of atom = 1.0×10^23
Using the energy equation.
∆E = (3/2)nR∆T
∆T = (2/3)∆E/nR
Where ;
R = universal gas constant = 8.314J/mol-K
n = number of moles = N/Nt
Nt = number of atoms in one mole of gas = 6.022×10^23
n = 1.0 ×10^23/6.022×10^23= 0.166
∆T = (2/3)×20/(0.166×8.314)
∆T = 9.66
T2 = T1+∆T = 0 + 9.66
T2 = 9.66°C
