Answer:

Explanation:
The gravitational force between two objects is given by

where
G is the gravitational constant
m1, m2 are the two masses
r is the separation between the two masses
In this problem, we have
the mass of each truck
r = 2.0 m is their separation
Substituting,

The doppler effect has red and blue shifts. A red shift means something is moving farther away, and a blue shift means it is moving closer. The universe has a red shift, and since a red shift means that it is moving farther away, this tells astronomers that the universe is still expanding.
Based on how they each acted in the trials, the substance that would be the most metallic is B.
Answer:
14 seconds
Explanation:
because you dropped it and it takes 14 seconds
Answer:
d) 1/4 F
Explanation:
The magnitude of electrostatic force between stationary charges is described by Coulomb's law. This law states that this force is proportional to the magnitudes of the charges:

When each of the spheres has lost half its initial charge, we have:

So, the new electrostatic force is:
