A chemical reaction is when two elements or radicals change places with two other elements or radicals is a ... reaction

A - double replacement

B - combination

C - decomposition

D - substitution

A car starts from rest and accelerates at a constant rate. After the car has gone 50 m it has a speed of 21 m/s. What is the acceleration of the car? A. 4.4 m/s2 B. 2.4 m/s2 C. 0.23 m/s2 D. 5.5 m/s2

True or false: If the distance between two objects is doubled, the gravitational force between them will decrease by 1/2.

Calculate the energy in kilowatt hours used by a heater that operates continuously for 30 minutes. The heater has a power rating of 3000 W.

How much volume (in cm3) is gained by a person who gains 11.6 lbs of pure fat?

When a rocket accelerates through space is there work done?

How do mountins building and volcanos relate to plate motion at convergent boundaries

A 20kg box is dropped 13m. how much work is done

Suppose a person whose mass is m is being held up against the wall with a constant tangential velocity v greater than the minimum necessary. Find the magnitude of the frictional force between the person and the wall

A ball is being rolled by a normal push of 1000N. it is opposed by friction which has a force of 0.3kN and air resistance which has a force of 23N. Calculate the resultant force.

Consider a Young's two-slit experiment in which the wavelength of light is 37% smaller than the distance between the slits.