B)comet nuclei are not uniform in composition
c. II and III only (the object has 0 acceleration and the object has constant velocity.)
Why?
Let's discard each of the given options to find the correct one(s).
<h3>
- There are no forces acting on the object:</h3>
False, if an object has a constant speed, it does not mean that there are no forces acting on it, in fact, there will be always acting forces, like frictional force, gravity force, air resistance, and others.
<h3>
- The object has a 0 acceleration:</h3>
True, in an object is moving at constant speed, it means that there is no acceleration, the speed will be the same all the time during motion.
<h3>
- The object has constant velocity:</h3>
True, <u>if an object is moving in a straight line at constant speed</u> the velocity will be also constant. The velocity of an object is referring to its speed and its direction, if the object is moving in a straight line, the direction will be the same, so, if the speed is constant, the velocity will be also constant.
Have a nice day!
Answer:
id say false
I might be wrong but ye i think its false
Explanation:
From the reaction, we see that for every 2 moles of Al
reacted, 852 kJ of energy is released. So convert the mass given to moles:
moles Al = 48.7 g / (26.98 g/mol)
moles Al = 1.805 mol
So the energy evolved is:
Energy = -852 kJ / 2 mol * 1.805 mol
<span>Energy = -769 kJ</span>