Question

A test tube has a diameter of 3 cm .how many turns would apiece of thread of length 90.42 cm make round the tube

Answer 1

The thread would make 15 rounds

Explanation:

• Since, the test tube is round. So, its circumference or the boundary will be given by

• Circumference of test tube  = 2 * pi * d/2 = d* pi

• Circumference of test tube = 3 * 2 = 6 cm

• Now, as we know that the thread has a length of 90.42 cm and one round of the test tube will take 6 cm. So, 90.42 cm will give

• No. of rounds = 90.42/6 = 15 rounds

Answer 2

Answer:

Explanation:

Since, the test tube is round. So, its circumference or the boundary will be given by

Circumference of test tube  = 2 * pi * d/2 = d* pi

Circumference of test tube = 3 * 2 = 6 cm

Now, as we know that the thread has a length of 90.42 cm and one round of the test tube will take 6 cm. So, 90.42 cm will give

No. of rounds = 90.42/6 = 15 rounds