A38 kg crate rests on a floor. a horizontal pulling force of 170 n is needed to start the crate
moving. what is the coefficient of static friction between the crate and the floor?

0.456033049

Explanation:

where N=mg hence

where m is mass of object, g is acceleration due to gravity whose value is taken as , is the coefficient of static friction and F is the applied force.

Making the subject we obtain

and substituting m for 38 Kg, g for and 170 N for  F we obtain

Therefore, the coefficient of static friction is 0.456033049

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//