4th RPA

An atom of lead (Pb) having an atomic mass of 207 amu has an atomic number of 82. How

many neutrons are present in this atom of lead?

Mathematical Equivalence

ON

When an object is acted on by unbalanced forces, the object will always —

• accelerate

• continue in the same direction

• continue at the same speed

• come to a stop

Tags

NGSS.MS-PS2-2

The motion of an object is shown in the graph.

Which statements are supported by the graph?

Select TWO correct answers.

• An unbalanced force acts on the object between 1 and 2 seconds.

• The object's velocity increases between 4 and 5 seconds.

• The object reaches its greatest acceleration between 4 and 5 seconds of motion.

• The object's greatest speed occurs between 5 and 7 seconds.

• An unbalanced force causes the object to increase its speed between 6 and 8

  seconds.

Tags

NGSS.MS-PS3-1

A 2000 kg truck and a 500 kg car are racing. The same amount of force is applied to each of

them.

Which statement below best describes the acceleration of the vehicles?

• The truck will accelerate twice as fast.

• The car will accelerate four times as fast.

• The car will accelerate twice as fast.

• The truck will accelerate four times as fast.

Tags

NGSS.MS-PS2-2

Which of the following would be found in the part labeled X in the above chart?

• Shows the slowing down of an object in motion

• Shows the speeding up of an object in motion

• Shows a change in the direction of an object in motion

• Shows the direction in which an object is traveling

Tags

NGSS.MS-PS3-1

A researcher observes a car speeding up from rest. The researcher records data about the car

and the car's motion.

Which data points can be used to calculate the net force that was acting on the car when it

was speeding up?

Select TWO correct answers.

• The car's mass is 1,000 kg.

• The car's speed increased for 7 seconds.

• The car started from rest.

• The car's acceleration was 4 m/s .

• The car traveled a total of 300 m.

Tags

NGSS.MS-PS2-2

Refer to the above image. Which of these is NOT found in the nucleus of an atom?

• Neutrons.

• Protons

• Atomic mass

• Electrons

When determining an element's identity, what is the most important subatomic particle

to examine?

• Electrons

• Neutrons

• Neutrinos

• Protons

Which of the atom models above represents a reactive metal?

• Model A

• Model B

• Model C

• Model D

Tags

NGSS.MS-PS1-1

Students in a science class prepared flashcards so that they could quiz one another about the arrangement of the periodic table. One of the flashcards contained information about two elements, Element L and Element M.The students had to use the information on the flash card to determine the possible positions of the two elements on a blank periodic table.

Select the location of the TWO elements on the periodic table that matches the information

on the flashcard.

• 1

• 2

• 3

• 4