The mass of mars is  6.42 × 1023  kg.  its moon phobos is 9378 kilometers away from mars and has a mass of  1.06 × 1016  kg. what is the gravitational force between mars and phobos?

F = G*m*M / R²

F gravity in N
G gravitational constant = 6.6742 * 10⁻¹¹ m³kg⁻¹s⁻²
m mass of object 1 in kg
M mass of object 2 in kg
R distance between object 1 and object 2 in m

The gravitational force between two objects is determined using the formula:

F = (GMm)/r², where F is the gravitational force between the two masses, G is the gravitational constant (6.67*10⁻¹¹) 

M and m are the masses of the two objects, and r is the distance between them. 

Substitute the given values and note that r = 9378 km must first be converted to meters to be consistent with the units. 

Thus, the gravitational force between Mars and Phobos is 5.16*10¹⁵ N.

The reflection of the candle in the concave mirror formed an upside-down virtual image that is smaller than the candle.in other words. the answer is the third option, c