Mr. Wang works in a recycling center. Recyclable materials arrive at the center mixed. Workers use magnets to separate steel cans from other items. Which two statements are true about the force between a steel can and a magnet?

Option 3, The attraction between the can and the magnet is a pull.

Explanation:

The complete question is

Mr. Wang works in a recycling center. Recyclable materials arrive at the

center mixed together. Workers use magnets to separate steel cans from

other items. Which two statements are true about the force between a steel can and a magnet?

1 Gravity pushes the can toward the magnet.

2 The force between the can and the magnet is a noncontact force.

3 The attraction between the can and the magnet is a pull.

4 The attraction between the can and the magnet is a push

Solution

The force exerted by magnet on steel is the pull force. In magnets unlike poles attract each other (pull force) while the like poles repel (push force). Now, the steel or any ferrous object in the garbage when experience magnetic field develop magnetic field of their own in such a way that their north always faces the south of the external magnet or vice versa.

Hence, the force between a steel can and a magnet is pull force

58 km per hour : d

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.