1) In picture below, what is the tension in string #1? 45 (2) 5kg. a) 70N b) 98 N c) 139 N d) 148 N e)155N 2) A 0.25 kg mass is attached to a string and swung in a vertical circle whose radius is 0.75m. At the bottom of the circle, the mass is observed to have a speed of 10 m/s. What is the magnitude of the tension in the string at that point? a) 2.45N b) 5.78N c)22.6N d) 35.7N e) 44.7 N 3) A car and driver have a combined mass of 1000 kg. The car passes over the top of a hill that has a radius of 10m. The speed of the car at that instant is 5 m/s. What is the force of the hill on the car as it pases over the top? a) 7300 N up b) 7300 N down c) 12,300 N up d) 12,300 N down e) ON