A particular Ci atom has a mass number of 37. Which statements about the atom are correct? Check all that apply.
It contains 37 protons.
It contains 20 neutrons.
It has an atomic number of 17.
It contains 37 neutrons.

It contains 20 neutrons

It has an atomic number of 17.

Explanation:

According to this question involving chlorine atom (Cl), the mass number (A) is said to be 37. The mass number of an element is calculated by adding the proton number and the neutron number i.e.

Mass no. = Proton no. + Neutron no.

The proton number is also called atomic number, and in this case as it is on the periodic table, the atomic number of Chlorine is 17. This means that chlorine atom has 17 protons. To calculate the number of neutrons in 37Cl, we say:

neutron no. = 37 - 17

neutron no = 20

From the above calculation, the following are true of 37 Cl:

- It contains 20 neutrons

- It has an atomic number of 17.

the answer is c. nacl

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied