Substance a has a density of 3 g/cm3 and substance b has a density of 4 g/cm3. in order to obtain equal masses of these two substances, what must be the ratio of the volume of a to the volume of b?

A train is travelling at 15m/s. It accelerates at 3m/s² for 20 seconds. How far does the train travel in this time?

A man is walking away from a lamppost with a light source h = 6 m above the ground. the man is m = 2 m tall. how long is the man's shadow when he is d = 8 m from the lamppost?

At the instant a current of 0.40 A is flowing through a coil of wire, the energy stored in its magnetic field is 9.5 ✕ 10-3 J. What is the self-inductance of the coil (in H) ?

A wave has a period of 4 seconds. What is its frequency?

Which ranks these materials by the attraction between their atoms from the weakest to the strongest?

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.