A student made the table shown to list some contact and non-contact forces. Examples of Forces
Contact Forces Non-Contact Forces
The upward force applied by a couch on a student sitting on it The force applied by an electromagnet on a wire
The force applied by a student on a box to move it The force which opposes the motion of an object on a rough surface

Which statement best explains why the table is incorrect?
Normal force is a force acting at a distance.
The student applies a non-contact force on the box.
The electromagnet and wire have to be in contact to apply the force.
Frictional force acts between the object and the rough surface when they are in contact.

0.19 m/s and 0.45 m/s

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

a sonic boom is a loud boom that breaks the sound barrier

explanation: