What is an ore?

a metal

a rock that contains a nonmetal resource

a nonmetal resource

a rock that contains a metal resource

How do cell phone hammers disable the communication between cell phones and nearby towers

What is Place where earthquake originates?

How fast must a bug swim to keep up with the waves it produces? How fast must it move to produce a bow wave?

Two friends whisper at a volume of 20 decibels. Later, they converse at a volume of 40 decibels. How much greater is the energy intensity of the conversation compared to the whisper? A. 20 times B. 10 times C. 1,000 times D. 100 times

Which of the following would lead to the smallest entropy loss in the surroundings? A. An exothermic reaction in a cold environment. B. An endothermic reaction in a hot environment. C. An endothermic reaction in a cold environment. D.

What conditions are required for nuclear fusion that prevent it from being used to generate electric energy?

What conditions in the nucleus are likely to result in the nucleus breaking apart? A. When the repulsion of the strong force is weaker than the repulsion of the electrostatic force B.

What color do you see when all colors of light are reflected

A ball is thrown with a velocity of 20 m/s at an angle of 60 degrees above the horizontal. What is the horizontal component of its instantaneous velocity at the the exact top of its trajectory?

You pull on a wagon resting on the sidewalk. What will happen next. A. The wagon does not move because the wagon applies more force to you than you apply to the wagon. B. The wagon moves because you apply more friction to the ground. C.