Calculate the electric repulsion between two protons located 1m apart 1.7x10-27kg, charge of protons is +1.6x10-19c

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

An important dimensionless parameter concerned with very high-speed flow is the mach number, defined as v/c, where v is the speed of the object such as an airplane or projectile, and c is the speed of sound in the fluid surrounding the object. for a projectile traveling at 1170 mph through air at 50 ˚f and standard atmospheric pressure, what is the value of the mach number?