Salt and pepper, soda, chocolate chip cookies, or a Twix™ candy bar, ... are all examples of heterogeneous mixtures<span>, where substances are not mixed on a molecular level.
</span><span>Water itself is an example of a homogeneous mixture. It often contains dissolved minerals and gases, but these are dissolved throughout the water. Tap water and rain water are both homogeneous, even though they may have different levels of dissolved minerals and gases.</span>
The formula of the kinetic energy is KE = 0.5*m*v^2.
Given m = 80 kg and KE = 4000 J,
4000 = 0.5*80*v^2
v^2 = 100
v = 10 m/s
Answer:
Explanation:
Given that,
The mass of a Moon, 
The mass of the Earth, 
The moon's mean orbit distance around the earth is, 
We need to find the gravitational force exerted on the moon by the Earth.
The formula of gravitational force is given by :
So, the required force is 
.
Answer:
c) is negative
Explanation:
As we know that work done by a force is the product of force and displacement vector.
W= F.d
F= Force
d= displacement
The work done by friction force always negative because it try to oppose the motion and act opposite to the direction of displacement.So the work done by air resistance is negative.
c) is negative
