What is the efficiency of a device that takes 400J of heat and does 120J of work while giving off 280 J of heat

Can more people see a total solar eclipse or a total lunar eclipse? Explain.

Which of the following items best embodies the physical property of conductivity? A. A teak log that has a large amount of mass for its volume. B. A diamond that is not easily scratched. C. A white cotton shirt that reflects all wavelengths of light.

What's the smallest wavelength?

If the mass of a material is 41 grams and the volume of the material is 5 cm^3, what would the density of the material be? answer: Units:

A rocket of mass 100,000 kg undergoes an acceleration of 2m/s2. show the net force acting on it is 200,000

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.