Achild on a spinning playground ride is 0.36 m from the center of the ride. the centripetal force on the child is 19 n.

what is the mass of the child if the child has a tangential speed of 0.54 m/s?

3.7 kg
13 kg
23 kg
79 kg

Answer : The mass of the child is, 23 kg.

Solution :

Formula used for centripetal force is,

where,

= centripetal force  = 19 N

m = mass of an object = ?

r = radius of path  = 0.36 m

v = velocity or tangential speed of an object  = 0.54 m/s

Now put all the given values in the above formula, we get the mass.

Therefore, the mass of the child is, 23 kg.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.  

wegner's theory did not explain how the continents could move

explanation: