Which of the following are three conditions that a scientific question must meet?

A. Testable, supportable, repeatable.

B. Supportable, repeatable, reliable

C. Repeatable, reliable, important

D. Testable, supportable, important

3) If an airplane is in flight cruising at constant velocity, what can be said about the net work being done on the plane? Draw a free-body diagram that supports your answer.

Compare positive and negative feedback mechanisms.

What simple machine would move or turn an object? wheel and axle lever screw wedge

Ethan made a diagram to compare examples of the first and second laws of thermodynamics. What belongs in the areas marked X and Y?

A cannon fires a cannonball. Explain how the cannonball gains kinetic energy. A. The sound of the explosion propels the cannonball. B. The thermal energy of the explosion propels the cannonball. C.

Why is copper a good conductor?

Sketch of the distance vs time graph for a car with constant velocity

3. Applying Concepts Explain why a canoe that has hollow, water- tight compartments on its ends won't sink, even if it is capsized.

If two forces of equal magnitude act on an object that is hinged at a pivot, the force acting farther from the pivot must produce the greater torque about the pivot. A) true B) false C) unable to decide without knowing the shape of the object

Standard voltage for electrical circuits in the United States is 120 volts. Is this the standard voltage in other countries?