<h2>MULTIPLE CHOICES</h2>

- What is the basic unit of all matter?

- OA neutron
- OB. atom
- OC. electron
- OD. proton
- OE. nucleus

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- <u>Atom</u> is the smallest, <u>indivisible unit of a chemical</u> <u>element and the fundamental unit of matter</u>. It consists of a nucleus (neutrons + protons) surrounded by an electron cloud. The <u>atom</u> is the smallest unit of matter that cannot be divided chemically and is a building block with its own set of properties.
<h3>#ProvideUniqueAnswers</h3>
Answer:
Explanation:
1) Force Friction = Normal Force * Coefficient of Friction
Force Friction = Mass * Gravity * Coefficient of Friction
2) F = ma
Force = mass * acceleration
Force Friction (from #1) = mass * acceleration
acceleration = Force Friction / Mass
Answer:
.25 Hz
Explanation:
Period = 4 sec
freq = 1/p = 1/4 hz = .25 Hz
Answer:
240 Ns
Explanation:
The momentum of an object is the product of its mass and its velocity:

where m is the mass of the object and v its velocity.
According to Newton's second Law of motion, the change in momentum of an object is related to the force applied by it by the equation:

where
F is the force exerted on the object
is the change in momentum
is the time elapsed
In this problem:
F = 120 N is the force exerted on the object
is the time elapsed
Therefore, the change in momentum of the object is:
