Question 4 6 pts Samantha wishes to maintain her weight and goes to the gym to work off the calories she consumed at breakfast that morning. She lifts a 28.0-kg barbell from shoulder level to above her head, through a vertical height of 0.550 m. How many times must she lift the barbell to make up for the 3.05 x 102 Calories of energy she consumed at breakfast? Note that Calories refers to food calories. (Include lowering the barbell as well.) O 4320 reps O 4230 reps 5650 reps 5560 reps 6 pts D Question 5 Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 12 rubs a distance of 7.50 cm each and with a frictional force averaging 63.3 N, what is the temperature increase? The mass of tissue warmed is only 0.100 kg, mostly in the palms and fingers. The specific heat of the tissue is 3500 J/(kg . C). O 0.074 . CD Question 5 6 pts Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 12 rubs a distance of 7.50 cm each and with a frictional force averaging 63.3 N, what is the temperature increase? The mass of tissue warmed is only 0.100 kg, mostly in the palms and fingers. The specific heat of the tissue is 3500 J/(kg . C). O 0.074 .C O 0.163 .C O 0.316 .C O 0.407 .C D Question 6 6 pts A piece of iron block moves across a rough horizontal surface before coming to rest. The mass of the block is 1.3 kg, and its initial speed is 3.7 m/s. How much does the block's temperature increase, if it absorbs 71% of its initial kinetic energy as internal energy? The specific heat of iron is 452 J/(kg . C). O 0.0183 .C O 0.0318 .CO 0.316 .C O 0.407 .C D Question 6 6 pts A piece of iron block moves across a rough horizontal surface before coming to rest. The mass of the block is 1.3 kg, and its initial speed is 3.7 m/s. How much does the block's temperature increase, if it absorbs 71% of its initial kinetic energy as internal energy? The specific heat of iron is 452 J/(kg . C). O 0.0183 .C 0.0318 .C O 0.0138 .C O 0.0108 .C D Question 7 6 pts The initial temperature of three moles of oxygen gas is 24.0C, and its pressure is 8.00 atm. Determine the final temperature if the gas is heated until the pressure and the volume are tripled