Two positively charged objects are located so they are 0.20 m apart. If the objects are separated until their centres are 0.40 m apart, by what factor will the electrostatic force between them change?

Which is not a vector quantity? a. displacement b. velocity c. time d. acceleration

2. Weight is a force from gravity pulling down on any object with mass. True False

8. There are different characteristics for each of the states of matter. Which statement describes a difference between solids and liquids? a. Temperatures can change a solid to a liquid, but cannot change a liquid to a solid, b.

A 5 feet tall man went for swimming in a pool. He saw the depth of water in the pool less than 5 feet. Will he be drowned? Write with reason.

Name at least two limitations of using models in science.

If a pressure gauge measure an increase in 3*10^ (5) Pa on an area of 0.7 m^2, calculate the increase in the force applied to the area?

Which of the following is an example of potential rather than kinetic energy? a. water rushing over Niagara Falls b. a molecule of glucose c. a crawling beetle foraging for food d. light flashes emitted by a firefly

If a force of 15 newtons [N] is applied to a surface and the pressure is measured as 4,000 pascals [Pa], what is the area of the surface in units of square milimeters [mm2 ]?

An engineer has the task of producing an aluminum alloy with a density of 3.0 grams per cubic centimeter. She comes up with the perfect alloy and saves a sample of it. Which mass and volume measurements correspond to this sample? 7 g and 2.

What must be your car's average speed in order to travel 235km in 3.25 hours?