For the following calculation, ignore air resistance Do not round your answer. Write the answer exactly as it is. An object falls from rest and strikes the ground 19 seconds later. The object's initial height was __ meters.

Which best describes friction int the context of newtons laws? 1. a kind of tape that holds things together 2. the force that opposes the relative motion of two objects in contact with and sliding past each other 3.

Which of the following is an example of a physical change but not a chemical change? A) The log gives off heat and light as it burns B) A tree stores energy from the sun in its fruit C) A penny lost in the grass slowly changes color D) A water pipe

Which factors affect the strength of the interaction btween two objects with electrical charges?

A man on a high cliff He threw the stone down at a speed of 10m/s The stone takes 5s, so it falls to the ground. find the height of cliff.

Why is the sum of the coefficients on the reactant side of a balanced equation does not have to equal the sum of the coefficients on the product side of the equation?

Which of these is not a conservative force and does not have a form of potential energy connected with it?

What is the effect of food color in the amount of food fish eat

Henry Heavtweight weighs 1000 N and stands on a pair of bathroom scales so that one scale reads twice as much as the other. What is the greater scale reading? What is the lesser scale reading?

A tape dispenser is an example of which simple machine pulley lever inclined plane screw

A brick with a mass of 20 kg and a weight of 196 N is released on a frictionless plane at an angle of 30°. What is the acceleration of the brick? A. 4.9 m/s2 B. 5.6 m/s2 C. 8.5 m/s2 D. 9.8 m/s2