A0.300 kg balloon is filled with helium until the volume of the balloon is 1.50m^3. the density of the contained helium is 0.178 kg/m^3, and the density of the surrounding air is 1.29 kg/m^3. what downward force must be applied to the balloon to prevent it from rising?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

1. when conducting a test on what kind of music increases the growth of plants, all of the following would fail to meet to fair test standard except (1 point) using different kinds of plants. giving some plants more water than others. exposing the plants to different types of music. using nutrient-rich soil for one and lesser soil for others. 2. engineering uses scientific thinking to solve real-world problems. (1 point) true false 3. what does it mean to test a hypothesis? (1 point) pass a quiz on other scientists’ results analyze only the results from scientific sources not make assumptions about how an experiment will turn out see if the results of an experiment are what the scientist predicted

Arock displaces 1.65 l of water. the volume of the rock is: a: 1,650 cm³ b: 165.0 cm³ c: 16.50 cm³ d: 0.165 cm³