True or false: Black holes are invisible because they do not reflect light? A. true B. false

Why do scientists need a standard system of measurement? A. to allow for consistency with measurement data B. in order to use tools marked in customary units C. so they can keep measurement data confidential D.

A man pushes a lawn mower on a level lawn with a force of 250N. If 40% of this force is directed downward, how much work is done in joules by the man in pushing the mower 6.2 m?

Plastic bags have replaced for the packing of the most materials. give these advantages and two disadvantages of using plastic over paper

Under normal conditions, you are just barely able to lift a mass of 74 kg. Your friend drops a box of volume 2.4 m3 into a lake. If you are just able to lift it to the surface (so that it is still completely submerged), what is the mass of the box

What type of wave doesn't require a medium?

A 2-kg object is dropped from a height of 1000 m. What is the force of air resistance on the object when it reaches terminal velocity

What is the approximate increase in size from a 1 w to a 2w carbon resistor?

I am looking for this answer : Which shows a correct order of steps in the scientific method? develop a hypothesis, analyze data, make observations, draw conclusions make observations, draw conclusions, develop a hypothesis, analyze data.

A gas in a piston is compressed doing - 439 j of work, and its internal energy increases by 318 j. how much heat flows? (be careful with + and -. + w = expansion. + q = added, + u = temp goes up) (unit = j)

A loop of wire is placed in a uniform magnetic field. (a) For what orientation of the loop is the magnetic flux a maximum? The plane of the loop is perpendicular to the magnetic field. The plane of the loop is parallel to the magnetic field.