How simple machines achieve mechanical advantage?

A uniform stationary ladder of length L = 2.7 m and mass M = 14 kg leans against a smooth vertical wall, while its bottom legs rest on a rough horizontal floor. The coefficient of static friction between floor and ladder is μ = 0.39.

car A start 10 meters ahead of car B. Car A moves at v = (3.0i+0j) m/s and car B moves forward at v = (7.0i+0j) m/s how many seconds does it takes car B to catch up

How do you found wave speed by using wavelength and frequency

If forces acting on an object are unbalance the object could experience a change in a) mass, speed, or direction b) negative acceleration or mass c) direction, mass, or both d) speed, direction, or both

The gun from the crime scene shows tool marks where the serial numbers are ground off. There are also tool marks on the bullets left behind.

V=345m/s, 7210Hz, X=?

As a mercury atom absorbs a photon of energy, an electron in the atom changes from energy level d to energy level e. Determine the energy of the absorbed photon in electronvolts.

During an exothermic reaction, the energy given off comes from atoms being consumed mass being burned into energy the breaking and forming of bonds mass being created

Can electrostatic attract both pull and pull?

Ways that charges can be transferred