Atmospheric Pressure is about 1.0x10^5 Pa. What is the downward force of the air on a desktop of surface area 1m^2?
Here we are dealing with force, pressure and area so we use the formula F=PA. We simply slot in the given numbers where P=1x105, and A=1. The resulting force is 1x105N.
MK
Related Physics A Level answers
All answers ▸Discuss how the graph of orbital velocities in rotational galaxies against distance from the galactic centre implies the existence of dark matter.
In a particle accelerator, you accelerate an electron. Afterwards, you measure it's energy to be 350 keV. Tell my why you can't find the speed from this energy using your knowledge of classical mechanics.
Show that a mass on a spring obeys simple harmonic motion.
A guitar string 0.65m long vibrates with a first harmonic frequency of 280Hz. Mary measures 1m of the string and discovers that it weighs 8.0x10^-4 kg. What is the tension in the guitar string?