Atomic Nucleus: The atomic number of an atom is equal to the number of what particles in the nucleus?:
1 answer:
Answer:
B) protons
Explanation:
The total number of protons in an atom represents the atomic number of that element. An element is generally expressed as
Where,
A is the element
N is the Mass number i.e., the number of neutrons and protons in an atom.
Z is the atomic number.
The elements are arranged according to their atomic number in the modern periodic table.
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Answer:
23.5 m/s
Explanation:
The velocity of the car in decelerated motion is given by
v = u + at
where
v = 0 is the final velocity
u is the initial velocity
a is the acceleration of the car
t = 3.0 s is the time it takes for the car to stop
The acceleration of the car is given by the frictional force, which is the only force acting on the car along the direction of motion, so:
where
is the coefficient of friction
Solving the previous equation for u, we find the initial velocity: