Answer:
Atoms can be joined together by chemical bonds.
Explanation:
When atoms form bonds, they can achieve a stable electron arrangement. To achieve a stable electron arrangement atoms can lose, gain or share electrons. There are many different types of bonds that hold atoms together.
Look for scientific research about whether these claims are correct or not.
Explanation:
The best thing to do after reading this advertisement is to look for scientific research about whether these claims are correct or not.
Answer:
The friend is wrong: the law of conservation of momentum is not violated
Explanation:
The law of conservation of momentum states that:
"For a system of an object, if the net external force acting on the system is zero, then the total momentum of the system is conserved"
In our problem, the system is the ball rolling down the hill. The ball gains speed as it rolls down, so its momentum increases, according to the equation:

where m is the mass of the ball and v its velocity. This may appear as a violation of the law, however it is not. In fact, the net external force acting on the ball is not zero, since there is the force of gravity acting on the ball. As a result, the force of gravity gives an acceleration to the ball, increasing its momentum: therefore, the law is not violated.
Answer:
57330.17766 Pa
Explanation:
= Pressure at 4000 m = 61660 Pa
= Density at 4000 m = 0.8194 kg/m³
(Values taken from table of properties of air)
= Velocity of jet = 
= Velocity at max thickness

From Bernoulli's equation

The absolute pressure at this point on the wing is 57330.17766 Pa
Answer:
45 W
Explanation:
First of all, we need to find the work done by the person to lift the bag. The work done is given by

where
F = 75.0 N is the force applied
d = 1.50 m is the displacement of the bag
Substituting numbers into the formula,

Now we can find the power used, which is given by

where
t = 2.50 s is the time taken
Again, using W=112.5 J, we find
