A hot air balloon works based on Archimedes' principle. If the weight of an entire hot air balloon is 2,227 newtons, then the hot air in the balloon needs to
be at least that much lighter than the cool air outside the balloon for it to float. Let's say
the balloon is a sphere with a radius of nine meters, and the density of air (at standard
temperature and pressure) is 1.2754 kg/m3. What should the weight of the air in the
balloon be for it to fly upward?
9,922 newtons
More than 9,922 newtons
O 12,149 newtons
O Less than 9,922 newtons

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.

What equation is used to calculate the weight of an object on a plant ?

Describe how the motion of a spring being pushed forward and backward is similar to the motion of air particles in a sound wave.