Help please A student makes a model of a hydrogen isotope as shown below.
Hydrogen Isotope
Key
proton
electron
The student is asked to create a model of a different hydrogen isotope. Which change should the student make to the model
to represent the different hydrogen isotope?
adding a neutron to the nucleus of the atom
adding an electron to the nucleus of the atom
adding a neutron to the outer portion of the atom
adding an electron to the outer portion of the atom

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Acar company is testing seatbelts using crash test dummies. the company finds that when cars come to a sudden stop, the crash test dummies' bodies continue to move forward. the seat belt keeps the crash test dummies from hitting the back of the seat in front of them. why do the crash test dummies' bodies continue to move forward even though the car stopped? a. the friction opposing their bodies' movement keeps them in motion. b. the inertia of their bodies keeps them in motion. c. the forward acceleration of the car keeps them in motion. d. the gravity pulling on the car keeps them in motion.

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