Josh has a toy car of mass 3 kg tied to a string of length 2 m. he ties the string to a pole and has the toy car drive in a circle around the pole at a speed of 3 m/s.

a. what is the centripetal acceleration of the car?

b. if the tension in the string exceeds 50 n, the string will break. how fast can he make the car go without breaking the string?

Part a)

Centripetal acceleration is defined as

now here we know that

m = 3 kg

now from above formula we have

Part b)

Maximum possible tension in the string is given as

now by force equation we have

now again by above formula

the answer is ampere

the ampere is used to measure electricity. an ampere is a unit of electric current equal. a unit of measure for the flow of current in a circuit. one ampere is the amount of current flow provided when one volt of electrical pressure is applied against one ohm of resistance.