Answer:
a ) 270 N
b )413.65 N
Explanation:
weight of the refrigerator = reaction force ( R )
= mg
= 63 x 9.8
R = 617.4 N
Maximum friction possible
= coefficient of friction x R
= .67 X 617.4
= 413.65 N
When force 270 N is applied , due to friction, the body does not move .
The friction force adjusts itself to the external applied force to prevent the body to budge.
Hence the friction force acting in this situation = 270 N
b ) The maximum friction possible is 413.65 . If we apply a force equal to or exceeding 413.65 N , body will move. Hence 413.65 N is the answer.
Answer:
= 2.471 yards/s
Explanation:
We can calculate the average velocity thus:
Where
: First 25 yards
: Time to travel
: Seconds 25 yards
: Time to travel
Thus
= 2.471 yards/s
Answer:
Both physical and chemical changes
Explanation:
From the definition of the law of conservation of mass, total mass of all the substances taking part in a chemical reaction is conserved and the number of atoms of each element in the reaction does not change when a new product is formed. Both physical and chemical changes follow the law since when the system is closed to all transfers of matter and energy, the mass of the system must remain constant over time, irrespective of the state.
Answer:
its a shield that can protect us from super hot rays and all though ita not that strong atleast we wont get burned to death lol :)
