Can someone helppp this picture below shows a canyon

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.