Which observation allows you to tell that two cubes are made of different metals? select the two correct answers.
a. their volumes are the same, and their masses are the same.
b. their volumes are the same, and their masses are different.
c. their volumes are different, and their masses are the same.
d. their volumes are unknown, and their masses are the same.
e. their volumes are the same, and their masses are unknown.

B. Their volumes are the same, and their masses are different.

C. Their volumes are different, and their masses are the same.

Explanation:

In order to ascertain that two metal cubes are made of different materials, their densities would be very helpful in our experiment.

Every metal has its own unique density and we can use it to differentiate it from other metals.

Density is defined as the mass per unit volume of a substance. Therefore, if the mass and volume are the same, their densities would be the same. Density is expressed a:

           Density =  

If the volumes are the same but given different masses, we can differentiate the metals using their quite different densities.

If the volumes are different but the masses the same, we would still obtain different values of density and the metals can be differentiated.

a electronegativity decreases beacuse the size of nucleus is bigger.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied