Observational studies are a prime example. Observational data is more reflective of the real environments that scientists make their inferences to than controlled experiments. The disadvantage of observational studies is that the variability is far greater. <span />

7 0

4 years ago

Two equal-mass pieces of metal are sitting side by side at the bottom of a deep lake. One piece is aluminum and the other is lea

murzikaleks [220]

Answer:

A. Aluminium

Explanation:

Buoyant force is simple terms refers to the weight of water displaced when an object is immersed in it. The higher the volume of an object, the higher the buoyant force.

From the problem, we have two metals of equal mass, aluminium and lead, of which lead is denser.

density = $\frac{mass}{volume}$

Volume = $\frac{mass}{density}$

This means that the volume of each metal depends on the density, and for the fact that lead is denser , it will have a lower volume than aluminium which means Aluminium will have a greater buoyant force.

5 0

4 years ago

Marcus wants to use two objects to compare the sizes of a proton and an electron. If he uses a basketball for a proton, which ob

Rudik [331]

Answer:

Explanation:

4 0

3 years ago

A solid nonconducting sphere of radius R = 5.4 cm has a nonuniform charge distribution of volume charge density rho = (14.3 pC/m

Gemiola [76]

Answer:

Explanation:

8 0

3 years ago