How would you decrease the total energy of a system consisting of a jar full of water A. place the jar in sunlight
B. Place the jar in the freezer
C. Heat the jar in a microwave
D. Place a lid on the jar and shake it

The combining of light nuclei is called blank. blank as in not actually blank. you know what im tryin to say.

How many neutrons does element x if it’s atomic number is 28 and its mass number is 87

You have been hired to design a spring-launched roller coaster thatwill carry two passengers per car. the car goes up a 10-m highhill, then descends 15m to the track's lowest point. you'vedetermined that the spring can be compressed a maximum o 2.0m andthat a loaded car will have a maximum mass of 400kg. for safetyreasons, the spring constant should be 10% larger than the minimumneeded for the car to just make it over the top. a) what spring constant (k) should you specify ? b) what is the maximum speed of a 350 kg car if the spring iscompressed the full amount.