AlphaStrike

From a point A on level ground, the angle of elevation to a water tower is 17°. From point B, 60 m nearer the tower, the angle of elevation to the top is 21°. Find the height of the tower to the nearest metre. [90m] What I've done: <C = 180 - (17+21) <C =...

How much thermal energy is released when 500g of steam at 100° C condenses into water and cools to 50°C Givens: m=0.5 kg t = 50 c = 2.010 Qtotal = Q1 + Q2 Qtotal = QmcΔt + mLv Qtotal = (0.5kg)(2.010)(50) + (0.5)(2.3*10^6) Qtotal = 1.15 * 10^6 The book say...

How much thermal energy is released when 500 g of steam at 100 degrees celsius condenses into liquid and then cools to 50 degrees celsius. What I`ve Attempted: Q=mLv m = 500g (0.5 kg) Lv = 2.3*10^6 Q=(0.5)(2.3*10^6) Q=1,150,000 J Q = 1.2*10^6 The answer i...

mPb = 50g (0.05 kg) Q = 8.7 * 10^2 J T = (x-22) x being the final temperature 870 = (0.05 kg)(1.3*10^2)(x-22) 870 = 6.5(x-22) 870 = 6.5x - 143 870 + 143 = 6.5x 1013 = 6.5x Divide both sides by 6.5 x = 155.8 (Round sig digs to 2 places) x = 160