Why is there a danger of explosion in places like coal mines where there are large quantities powdered, combustile material

How do vibration produce sound?

Maxwell shoots a rubber band at his friend Jimmy. Which type of energy is converted into kinetic energy? A) elastic potential energy B) nuclear potential energy C) chemical potential energy D) gravitational potential energy

Omar wrote a hypothesis about batteries called dry cells. If more dry cells are connected end to end, a light bulb will work longer because there is more energy available.

What is a qualitative forecasting​ method?

What EMF is produced if a waffle iron that draws 2.5 amperes and has an inductance of 560 millihenries is suddenly unplugged, so the current drops to essentially zero in 0.015 seconds

Which of galileo's observations most strongly supported a heliocentric cosmology? the phases of venus?

How can scientists know for sure that the cell theory is true? What evidence do we have to prove it

Two frisky grasshoppers collide in midair at the top of their respective trajectories and grab onto each other, holding tight thereafter. One is a robust 250 g beast initially moving south at 15.

A 50 kg child runs off a dock at 2.0 ms (horizontally) and lands in a waiting rowboat of mass 150 kg. At what speed does the rowboat move away from the dock?

A force of 15 N acts upon a 3 kg block. Calculate the acceleration of the object. Question 2 options: A. 75 m/s^2 B. 5 m/s^2 C. 45 m/s^2 D. 18 m/s^2