Calculate the magnitude of the normal force on a 17.7 kg block in the following circumstances. (Enter your answers in N.) HINT (a) The block is resting on a level surface. 173 Correct: Your answer is correct. N (b) The block is resting on a surface tilted up at a 30.8° angle with respect to the horizontal. N (c) The block is resting on the floor of an elevator that is accelerating upward at 3.03 m/s2. N (d) The block is on a level surface and a force of 115 N is exerted on it at an angle of 30.8° below the horizontal. N

Calculate the ratio of h+ ions to oh– ions at a ph = 6. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 6. are they the same? why or why not? record your explanation in table a. what is the concentration of h+ ions at a ph = 6? mol/l what is the concentration of oh– ions at a ph = 6? mol/l what is the ratio of h+ ions to oh– ions at a ph = 6? : 1

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers

What does the law of conservation of mass state?