Radio telescopes can sometimes detect stars which are behind dust clouds.

a. True

b. False

Mineral is commonly used as an abrasive?

What is the mass number of an isotope of this atom that has 2 neutrons

Which selection is a characteristic of both living and nonliving things

Calculate the final temperature when 50 ml of water at 80°c are added to 25 ml of water at 25°c.

High mass stars are more massive produce more energy burn brighter and have shorter life cycle than low mass stars True or false

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?