How does planting trees in urban areas improve air quality and reduce energy use?

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.

aa 200 kg wooden crate is being pulled across a horizontal wooden floor. What is the frictional force acting upon the box if the coefficient of friction is 0.35?

One isotope of sodium has 11 protons and 7 neutrons. What is the mass number of this isotope?

What is the primary visible color of an emission nebula?

Suppose we imagine the Sun to be about the size of a grapefruit. How big an area would the orbits of the nine planets of the Solar System cover?

Which is the relationship between photon energy and frequency?

Two like charges are separated by some distance. Describe the quantitatively what will happen to the force exerted by one charge on the other ifa) the distance between the charges is doubledb) the distance between the charges is halvedc) one of the

A chemical is one or two letter used to represent an element

A student throws a 5.0-newton ball straight up. What is the net force on the ball at its maximum height? (1) 0.0 N (3) 5.0 N, down (2) 5.0 N, up (4) 9.8 N, down

An object starts from rest and falls freely for 40. meters near the surface of planet P. If the time of fall is 4.0 seconds, what is the magnitude of the acceleration due to gravity on planet P?