The needle, when playing a gramophone record, presses on it with a force of 0.27 N.

The needle, when playing a gramophone record, presses on it with a force of 0.27 N. What pressure does the needle exert if the area of its tip is 0.0003 cm2?

Initial data: F (force with which the needle presses on the gramophone record) = 0.27 N; S (needle tip area) = 0.0003 cm2.

SI system: S = 0.0003 cm2 = 0.3 * 10 ^ -7 m2.

The pressure that the needle will exert on the record can be calculated using the formula: P = F / S.

Let’s make the calculation: P = 0.27 / (0.3 * 10 ^ -7) = 0.9 * 10 ^ 7 Pa = 9 MPa.

Answer: The pressure of the needle on the gramophone record is 9 MPa.