Author Question: A 2.0-kg mass swings at the end of a light string (length = 3.0 m). Its speed at the lowest point on ... (Read 85 times)

cabate · **on:** Jul 28, 2018

A 2.0-kg mass swings at the end of a light string (length = 3.0 m). Its speed at the lowest point on its circular path is 6.0 m/s. What is its kinetic energy at an instant when the string makes an angle of 50 with the vertical?
a. 21 J
b. 15 J
c. 28 J
d. 36 J
e. 23 J

Question 2

A pendulum is made by letting a 2.0-kg object swing at the end of a string that has a length of 1.5 m. The maximum angle the string makes with the vertical as the pendulum swings is 30. What is the speed of the object at the lowest point in its trajectory?
a. 2.0 m/s
b. 2.2 m/s
c. 2.5 m/s
d. 2.7 m/s
e. 3.1 m/s