Pressure = Force/Area. Force = mass × acceleration, dimensions [MLT⁻²]. Area = L². So pressure = [MLT⁻²]/[L²] = [ML⁻¹T⁻²]. This is also the dimension of stress. Common exam trap: confuse with energy density which is also [ML⁻¹T⁻²].
Explanation:
Hydraulic brakes operate on Pascal's Law. It states that an external pressure applied to an enclosed, incompressible fluid is transmitted undiminished equally in all directions throughout the fluid volume. When force is applied to the small brake pedal cylinder, it exerts a large pressure that is transmitted to the larger wheel cylinders, amplifying the force.
Explanation:
When a wave (like light or sound) changes mediums, its velocity changes due to the new medium's optical or mechanical density. Wavelength changes proportionally with velocity (v = fλ). However, frequency is determined solely by the source generating the wave and the energy of the photons/particles, and it remains absolutely constant.
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