Which statement about the atomic nucleus is correct?
a. the nucleus is made of protons and neutrons and has a negative charge.
b. the nucleus is made of protons and neutrons and has a positive charge.
c. the nucleus is made of electrons and has a positive charge.
d. the nucleus is made of electrons and has a negative charge. select the best answer from the choices provided a b c d

Answer : The correct option is, (b) The nucleus is made of protons and neutrons and has a positive charge.

Explanation :

As we know that an atom is the smallest unit of a matter that consist of three subatomic particles which are electrons, protons and neutrons.

The protons and the neutrons are located inside the nucleus or center of the nucleus where the mass of the an atom is concentrated and the electrons are located around the nucleus.

The protons are positively charged, the electrons are negatively charged and the neutrons are neutral that means it has no charge.

Hence, the correct option is, (b) The nucleus is made of protons and neutrons and has a positive charge.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."