13. The centripetal acceleration of a planet in an elliptical orbit about the sun is greatest when t
15. A 5 kg piece of lead (specific heat 0.03 cal/g C°) having a temperature of 80° C is added to 500
17. An energy of 13.6 eV is needed to ionize an electron from the ground state of a hydrogen atom. W
18. Which form of electromagnetic radiation has the longest wavelengths?(A)gamma rays(B)microwaves(C
19. Which of the following statements is incorrect?(A)Ionic bonding results from the transfer of ele
20. Which of the following statements is true?(A)When two opposing processes are proceeding at ident
21. The reactionN2(g) + 3H2(g) 2NH3(g)takes place in a 1.0-L vessel initially filled with an equimol
25. Given:Cu2O(s) + (1/2)O2(g) → 2CuO(s)ΔH° = –144 kJCu2O(s) → Cu(s) + CuO(s)ΔH° = +11 kJCalculate t
28. A sphere moves past an observer at 0.6c. Whatshape does the observer see?(A)A sphere, slightly s
29. What is the angular speed in rad/s of a turntablerotating at 33 1/3 rev/min?(A)2.83(B)6.98(C)1.7
31. Five g of water are vaporized in a 2.0 L pressure cooker and heated to 500 K. and the molar mass
32. How much heat (in kilocalories) is needed to convert 1 kg of ice at 0° C into steam at 100° C? (