By using a machine, an effort of 10N was moved through a distance of 14m to raise a load of 180N to height of 5m. How many times has the machine made work easier?

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it

answercollision;

490 n

f=125n a=2.5m/s2