What is the efficiency of a machine that miraculously converts all the input energy to useful output energy?

In a double-slit experiment, the slit separation is 2.0 mm, and two wavelengths, 750 nm and 900 nm, illuminate the slits. A screen is placed 2.0 m from the slits.

A spherical party balloon is being inflated with helium pumped in at a rate of 4 cubic feet per minute. How fast is the radius growing at the instant when the radius has reached 2 ft

A jar is completely filled with water, and then it is sealed with a lid. If you push down on the lid with a pressure of 1000 Pa, what happens to the water pressure at the bottom of the jar?

A bike travels at a constant speed for 4.00 m/s for 5.00 seconds. How far does it go

I throw a ball upwards. Which of the following is a true statement? A. At the top of its climb, its velocity will be 9.8 m/s2 B. At the top of its climb, its acceleration will go to 0. C. At the top of its climb, its velocity will go to 0. D.

Which would react chemically by forming an ionic bond? A. 2 chlorine atoms with 7 valence electrons each B. 1 neon atom with 8 valence electrons and 1 lithium atom with 1 valence electron C.

Which of these are considered an oxidizing mutagenic agent? x-rays benzopyrene gamma rays

5. A B note has a frequency of 493.88 Hz. Calculate its wavelength in meters.

When one of the electrons of a particular atom undergoes a transition to a quantum state of lower energy, it a) collides with another of its electrons b) exchanges quantum states with another of its electrons c) undergoes a transition to a quantum

What's the symbol for an ionized bromine atom?