Every real machine: must be more than 100% efficient must be equal to 100% efficient must be less than 100% efficient

While standing in line to buy concert tickets, Kit moved 60 feet closer to the ticket window over a period of 30 minutes. At this rate, how many minutes will it take her to move the remaining 70 yards to the ticket window?

How light used to study space

What is the fundamental frequency on a 8 m rope that is tied at both ends if the speed of the waves is 16 m/s?

A film with n = 1.60 is deposited on glass. what is the thinnest film that will produce constructive interference in the reflection of light with a wavelength of 510 nm?

What physical process changed the geological area and composition of the earths ocean

A swimming pool has the dimensions of 10 meters, 5 meters, and 1 meter. What is the pool's volume? 50 m 50 m3 50 m2 25 m3

A child pushes horizontally on a box of mass m which moves with constant speed v across a horizontal floor. The coefficient of friction between the box and the floor is μ. At what rate does the child do work on the box?

What two qauntities must be known to calculate the density of a sample of matter

An element's atomic number is 38. How many protons would an atom of this element have?

What's are some forms of chemical energy