When a car goes around a circular curve on a horizontal road at constant speed, what force causes it to follow the circular path?

a - the normal force from the road
b - the friction force from the road
c - gravity
d - no force causes the car to do this becuase the car is traveling at constant speed and therefor has no acceleration

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.

Aswimming pool whose volume is 10 comma 000 gal contains water that is 0.01% chlorine. starting at tequals0, city water containing 0.003% chlorine is pumped into the pool at a rate of 5 gal/min. the pool water flows out at the same rate. what is the percentage of chlorine in the pool after 1 hour? when will the pool water be 0.006% chlorine?