Three substances that can make electricity. What are these substance

Which is the best definition of activation energy? A. the energy required to end a chemical reaction B. the energy required to bind a substrate to an active site C. the energy required to break the bonds of reactant molecules D.

17. A simple machine made up of a slanted surface such as a ramp or stairs is called A wheel & axle B wedge C pulley inclined plane

Strontium-85 has a half-life of 65 days. how long will it take for the radiation level of strontium-85 to drop to one-fourth of its original level?

How does climate change lead to an increase in algal blooms? a. Decreased temperatures lead to an increase in phytoplankton growth. b. Increased levels of carbon dioxide, a greenhouse gas, leads to increased phytoplankton growth. c.

If you look at a star that is 14 light yaers away, how long ago did the light you are seeing leave the star

A graph titled Position versus time for with horizontal axis time (seconds) and vertical axis position (meters). A straight blue line runs with an upward slope from 0 seconds 3 meters to 4 seconds 15 meters. The starting position of this object is m.

There is a 50 g sample of Ra-229. It has a half-life of 4 minutes. How much will be left after 12 minutes?

Fill in the missing words to make the statements about electromagnetic induction true. If the north pole of a magnet is inserted into a solenoid, a will be induced in the solenoid.

an 85 kg construction worker has 37,485 j of gravitational potential energy to the nearest whole number the worker is blank m above the ground. answer the blank = )

What are the similarities and differences between speed and velocity?