Why are all machines not 100% efficient

A. Mass

B. Gravity

C. Friction

D. Distance

What is one way radiation is used that is beneficial for our health?

Identify four types of lava that form at hotspots and the characteristics of each type of lava.

Suppose two parallel-plate capacitors have the same charge Q. but the area of capacitor 1 is A and the area of capacitor 2 is 2A. 1.

What is an isobar? a. a unit of measurement for air pressure b. a line along which air pressure is constant c. a region in which the weather is not changing d. a symbol on a weather map showing wind direction

A 4-kilogram cat is resting on top of a bookshelf that is 3 meters high. What is the cat's gravitational potential energy relative to the floor if the acceleration due to gravity is 9.8 m/s^2?

Which concept was supported by taking measurements of the same stars at night and then again during solar eclipses?

Which of these is a biotic factor? A) topography B) soil C) air D) bacteria

One reason it's often easy to miss and action reaction pair is because of?

Recently, some information about a distant planet was learned. It has a radius of 6000000 meters, and the density of the atmosphere as a function of the height h (in meters) above the surface of the planet is given by δ (h) =

Which of the following is not a good approximation of the relationship between independent and dependent variables? A. independent: first, dependent: next B. independent: input, dependent: output C. independent: cause, dependent: effect D.