The mechanical quantity, which has dimensions of reciprocal of mass \( \text{M}^{-1} \) is
The dimension of the universal gravitational constant \(G\) is \([\text{M}^{-1}\text{L}^3\text{T}^{-2}]\). Therefore, its dimensions contain the reciprocal of mass.
The diameter of a spherical bob, when measured with vernier callipers yielded the following values: 3.33 cm, 3.32 cm, 3.34 cm, 3.33 cm and 3.32 cm. The mean diameter to appropriate significant figures is:
The mean of the values is \(\frac{3.33 + 3.32 + 3.34 + 3.33 + 3.32}{5} = 3.328\text{ cm}\). Rounding to the least number of decimal places in the readings (two decimal places) yields 3.33 cm.
Which of the following statement is not true?
Pressure is defined as thrust per unit area. Since thrust is a normal force component, it is always perpendicular to the surface. Pressure does not have a unique direction associated with it in space, making it a scalar quantity.