What are four elements that are involved in the cycling of energy and matter on earth

How does current change under different polarity?

What percentage of energy is available to organisms at each level of an energy pyramid?

A rectangular loop of copper wire of resistance r has width a and length b. the loop is stationary in a uniform magnetic field. the magnetic field b at time t = 0 seconds is directed into the page as shown below.

You are at the controls of a particle accelerator, sending a beam of 1.80*107 m/s protons (mass m) at a gas target of an unknown element.

Various properties of a piece of fabric are recorded during an experiment. The fabric is purple. The length of the fabric is 17.5 inches. The width of the fabric is 10.0 inches. The fabric is rough to the touch.

A rock with mass m = 4.00 kg falls from rest in a viscous medium. The rock is acted on by a net constant downward force of F = 17.

On arrival at a vehicle collision, you observe a small fire in the engine compartment. A bystander is attempting to smother the fire with a jacket as you approach with an A-B-C extinguisher from your ambulance.

Gertrude writes a short story in which the main character must enter a nuclear-powered spaceship's engine room that has lost its shielding in order to prevent the engine from flooding the rest of the ship with radiation.

PV = nRT, is the a. equation of state of an ideal gas b. theorem of equipartition of energy c. second law of thermodynamics

Which conducting electricity has the most harmful effects?