What is a sentence that could explain a result and can be tested?

How many cells are in a grown person body

The first law of thermodynamics describes how the heat added to a system is conserved. Heat the internal energy of the system or is transformed into, or both. Heat is just transformed, not created or destroyed.

Which statement is true? A) Batteries supply alternating current. B) Electromagnetic induction supples direct current. C) In the US, the main source of electricity is from direct current.

What two things do i need to know to find velocity

5.8 meters/second + 1.2 meters/second

Astronauts in orbit are not truly weightless.

Which of the following statements is true regarding the nature of light? Straight line motion is a particle property of light. Straight line motion is a wave property of light. Straight line motion is not a property of light.

A particle that is composed of two up quarks and one down quark is a (1) meson (3) proton (2) neutron (4) positron

Car headlights have both low beams and high beams. The high beams may be necessary when it is very dark outside. If the power for the high beam is 60.0 watts and the current is 5.0 amps, how much voltage is required?

Tsunami waves are almost the same as ripples caused by throwing a rock into a pond. what is the major difference between the two?