Explain the difference between force and torque


A force is any quantity capable of producing motion. A torque is a force times the
perpendicular distance from the line of action of the force to the axis of rotation that
is capable of producing angular motion.

Physics & Space Science

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Air at 20°C flows at 1 m/s between two parallel flat plates spaced 5 cm apart. Estimate the distance from the entrance to the point at which the hydrodynamic boundary layers meet.

GIVEN
Air flows between two parallel flat plates
Air speed (U?) = 1 m/s
Distance between the plates (D) = 5 cm = 0.05 m
Air temperature = 20°C
FIND
The distance from the entrance (X1) where the boundary layers meet

ASSUMPTIONS
Steady state
Laminar flow

SKETCH

Physics & Space Science

Which of the following statements is true?

A. Even though X-rays have higher energy, they move with the same speed as that of visible light. B. X-rays have higher energy, but still they move slower than visible light. C. X-rays have higher energy, hence they move faster than visible light. D. None of these choices are correct.

Physics & Space Science

Because the changes in energy levels happen in discrete steps, we refer to these as ________ leaps

Fill in the blank(s) with correct word

Physics & Space Science

Which of the following sound frequencies lie(s) in the audible range?

a. 13 Hz b. 5 kHz c. 1 MHz d. All of these

Physics & Space Science