In an experiment on simple pendulum to determine the acceleration due to gravity, a student measures the length of the thread as 63.2 cm and diameter of the pendulum bob as 2.256 cm. The student should take the length of the pendulum to be

Question

In an experiment on simple pendulum to determine the acceleration due to gravity, a student measures the length of the thread as 63.2 cm and diameter of the pendulum bob as 2.256 cm. The student should take the length of the pendulum to be (A) 64.328 cm (B) 64.3 cm (C) 65.456 cm (D) 65.5 cm

Tardigrade Admin · Accepted Answer

Length of pendulum = Length of thread + Radius of bob

= 63.2 + \frac{2.256}{2} = 36.2 + 1.128

= 6.4328 c m

But now the student must apply rule for taking significant digits in a measurement. In addition or subtraction, Number of digits after decimal in result = Least number of digits after decimal in quantities added So, length of pendulum

= 64.3 c m

Q. In an experiment on simple pendulum to determine the acceleration due to gravity, a student measures the length of the thread as 63.2cm and diameter of the pendulum bob as 2.256cm. The student should take the length of the pendulum to be

64.328 cm

64.3 cm

65.456 cm

65.5 cm

Q. In an experiment on simple pendulum to determine the acceleration due to gravity, a student measures the length of the thread as $63.2 c m$ and diameter of the pendulum bob as $2.256 c m$ . The student should take the length of the pendulum to be