Question

to hold a 10 kg mass 1.2 ms above the foor for 30 seconds d.118』 e.1180 b.12』 E None of the above answers are corect moving at 60 km/h. The kinetic energy o adi is moving at 30 km/h. Car B has a nass of 1000 kg and is f can e. twice that of car B f. none of these answers are correct. a half that of car B d. four times that of car B. e. noro b. equal to that of car B Cire mtod of solution is as important as your answer. Show all your work on these pagers Circle your answers (15 each) EXERCISES: Yue race car is driving around an unbanked turn that has a radius of curvature of 205 m. I the race car is to between the ttravese this curve at 200 mph (89.4 m/s). What is the required coefficient of static frietion track and the car's tires? At what speed must the surface of a space station move so that the astronaut experiences a push on his feet equal to half of her weight on earth? The radius of the space station is 1610 m. 2.

Answer 1

1. a) The velocity of the car is changing

speed is constant but direction is changing so velocity of the car is changing   
acceleration of car also changes direction so it is not constant and directed radially

2. a_c =v²R

a' = v²R/4 = a_c/4