Which statement describes heterogeneous mixtures? They are made up of two or more pure substances that are not chemically bonded together and appear non-uniform.
The substances they are composed of can only be separated chemically.
The substances they are composed of have fixed ratios between their components.
They are made up of two or more pure substances that are chemically bonded together and appear uniform.

The earth exerts a gravitational force of 500 n on amy. what is amy’s mass in kg?

In the united states, tornadoes generally occur because of the freezing of ocean water underwater earthquakes meeting of cool and warm air masses shifting of warm and cool ocean currents

Aleaky 10-kg bucket is lifted from the ground to a height of 15 m at a constant speed with a rope that weighs 0.7 kg/m. initially the bucket contains 45 kg of water, but the water leaks at a constant rate and finishes draining just as the bucket reaches the 15-m level. find the work done. (use 9.8 m/s2 for g.) show how to approximate the required work by a riemann sum. (let x be the height in meters above the ground. enter xi* as xi.) lim n → ∞ n (9.8)(45−3 xi) i = 1 δx express the work as an integral. 0 dx evaluate the integral. (round your answer to the nearest integer.) j