Steel has a density of 8030kg/m^3. Show that a steel ball with a diameter of 5cm weighs approximately 5N
Using Weight = mass*gravitational strength
Using: Mass = density * volume
Using Volume = (4/3)pir3
Radius = 2.5cm = 0.025m
Volume = (4/3)pi0.0253 = 0.00006544 m3 (to 4 siginificant figures)
Mass = 8030 * 0.00006544 = 0.5256 kg (to 4 significant figures)
Weight = 0.5256 * 9.81 = 5.155 N (to 4 signigicant figures)
5.155 is approximately 5, therefore weight of the steel ball is approximately 5N
SH
Related Physics A Level answers
All answers ▸A motorist traveling at 10m/s, was able to bring his car to rest in a distance of 10m. If he had been traveling at 30m/s, in what distance could he bring his cart to rest using the same breaking force?
An electron is moving with speed 2x10^5ms-1 through a magnetic field of strength 0.5T. If the electrons velocity is perpendicular to the direction of the magnetic field, what is the magnitude of the force felt by the electron?
In an electric propulsion system, alpha particles are accelerated through a potential difference of 100kV at an average rate of 10^20 alpha particles per second. Calculate the average thrust the system can provide.
How can an object be accelerating when it's velocity is constant, and how does centripetal acceleration work.