One watt (w) is equal to 1 j/s. assuming that 5.0% of the energy output of a 75 w light bulb is visible light and that the average wavelength of the visible light is 550 nm, how many photons are emitted by the light bulb per second?

What magnet maintains its magnetic proaperties even in the absence of an external magnetic field? a) Ferromagnet b Paramagnet c) Diamagnet d) Electromagnet e) Ferrimagnet

What is usually the first step in amending the US Constitution

What type of heat transfer occurs in conduction

A meteor is approaching Earth. Which statement about its motion is true? The meteor travels upward relative to Earth. The meteor accelerates. The meteor is out of Earth's gravitational force field. The meteor falls with a constant velocity.

Which of the following gives the best description of the motion of electrons in a conductor? A. The electrons in conductors usually move in straight lines. B. The electrons in conductors are able to move about freely. C.

The electrical charge of an atom as a whole is? A. Positive B. Negative C. Neutral D. Dependent upon atomic number

3.00Kg toy falls from a height of 1.00m. What is the kinetic energy just before the ground?

A car with an initial velocity of 5.0 is acelerated at 3.0for 4.0seconds what os the velocity of tje car ofter the 4.0seconds

How do patterns in motion of the stars tell us about the origin of our Universe?

A soccer ball has 1200 j of kinetic energy and a mass of o. 8 kg what is the speed of the ball when it is kicked