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 ▸On a speed/time graph: a) how would a constant deceleration be illustrated? b) how would you use the graph to calculate total distance travelled?
Derive an expression for the centripetal acceleration of a body in uniform circular motion.
A ball is kicked from a tower (50m) at a speed of 20m/s. How far away does the ball hit the ground?
A circuit with a voltage source of 18V, has 3 resistors all connected on parallel, values at 2ohms, 6ohms and 7.5ohms. Find the total circuit resistance, and then subsequently, the total current supplied and power dissipated in the curcuit.