Answer:
Its C
Explanation:
POE (process of elimination) Its not B because the brake pads are well brakes. Treading tyres is also increasing friction so C
Answer:
e. The impulse exerted by the floor
Explanation:
a. The momentum just before colliding with the floor.
will be identical because they have the same mass and are falling the same distance so will have the same velocity. p = mΔv, v = √(2gh)
b. The amount of time in contact with the floor.
a component of impulse, but not the entire story. Ball B could have a longer contact time, but a smaller average force. p = FΔt
c. The kinetic energy just before colliding with the floor.
will be identical because they have the same mass and are falling the same distance so will have the same velocity. KE = ½mv², v = √(2gh)
d. The average force exerted by the floor
a component of impulse, but not the entire story. ball B could have a larger average force but a shorter period of action. p = FΔt
In the Periodic Table, elements with similar reactivity and similar properties are found under the same column.
In fact, elements in the same columns are said to be in the same "group", and they have the same number of valence electrons, i.e. the same number of electrons in the outermost shell. This is the main characteristics that determine how an element reacts with other elements.
For instance, Litium (Li), sodium (Na) and potassium (K) are all in the first group, and they both have 1 valence electrons. This means they can easily give away this electron to an atom of another element forming bonds with it, and therefore they have high reactivity. Instead, elements of the 8th group are called "noble gases", and they all have similar properties: they all have the outermost shell full of eletrons, so they have zero valence electrons and so they have little or no reactivity at all. Example of elements in this group are Neon (Ne) and Argon (Ar).
Answer:
221.17 kJ
Explanation: Note the heat of vaporization is in kJ/mol,then to determine the number of moles of water: divide the mass by 18. Then multiply the number of moles by the molar heat of vaporization of water.
N = 97.6 ÷ 18
Q=molar heat *moles
Q = (40.79) * (97.6 ÷ 18)
This is approximately 221.17 kJ
Answer:
the resistance that one surface or object encounters when moving over another.
Explanation: