All forces result because of? between objects?

Why does a car that runs 120 km/h is faster than one that runs 120miles/h

A flower pot is knocked off a window ledge from a height d = 19.6 m above the sidewalk. It falls toward an unsuspecting man of height h = 1.79 m who is standing below. Assume the man requires a time interval of Δt = 0.300 s to respond to the warning.

Describe what happens when a muscle contracts.

Energy in the atom can be absorbed or released only in quanta of energy.

A car has a kinetic energy of 432,000j when traveling at 32 meters a second, what's the cars mass?

You (60 kg) and your friend (80 kg) are both floating on separate tubes next to each other on the San Marcos River. Now you push your friend with 10 Newton. Select all correct statements. A.

Six artificial satellites complete one circular orbit around a space station in the same amount of time. Each satellite has mass m and radius of orbit L.

A negative correlation between degree of wealth and likelihood of suffering from a psychological disorder would indicate that

1. What's your great idea for capturing carbon emissions from existing power plants today?

A lever allows a 35 N load to be lifted with a force of 7 N. What is the mechanical advantage of the lever?