A photo frame with a mass of 2.8 kg is hung from a nail according to the opposite figure. If we know that the nail is located exactly in the middle of the string and the frame does not touch the wall, how many newton is the tensile strength of the string?

One string (side of) must support 1.4 kg.

T cos 15 = vertical force required by each side of the string

T cos15 =  1.4 * 9.8 N

T = 1.4 * 9.8 / cos 15 = 14.2 N

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.