A 150g mass tied on a string is whirled in a vertical circle of radius 30cm with a uniform speed. At the lowest position the tension in the string is 9.5N. Calculate the velocity of the
mass.
(2 marks)

v = 4 m/s.

Explanation:

Given that,

Mass of the object tied on a string, m = 150 g = 0.15 kg

The radius of the vertical circle, r = 30 cm = 0.3 m

At the lowest position, the tension in the string is 9.5N.

We need to find the velocity of the mass.

At the lowest point, the net centripetal force is given by :

Putting all the values to find v.

So, the velocity of the mass is 4 m/s.

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

it is a negative acceleration