Telescopes are examples of concave mirrors. true or false?

An element with the atomic number of 13 and mass number of 27 has how many neutrons?

What is the unit for intensity

Which statement describes why radiocarbon dating has an upward limit of 50 000 years

Is this hydroelectric pumped storage being used in any coastal cities without rivers? What do they use?

You are doing an experiment about the diet of mice. You want to see how the amount of salt in a mouse's food affects how much water the mouse drinks. What should the independent variable be? a. the type of mouse b. the amount of salt in the food c.

Identify the element that chlorine forms a covalent bond with

A child pulls a sled up a snow-covered hill. The child does 405 J of work on the sled. If the child walks 15 m up the hill, how large of a force must the child exert?

A piece of glass with a mass of 32.50 g specific heat of 0.840 J/g*°C and an initial temperature of 115 °C was dropped into a calorimeter containing 57 g of water (specific heat 4.184 J/g*°C).

Which of the following is the most likely description of the product or products of a double-displacement reaction? A) one new compound B) two new compounds C) oxygen and energy D) one new compound and an element

A balloon is filled with 12L of air at a pressure of 2 atm. What is the volume of ballon if the pressure is changed to 3 atm?