Friction reduces efficiency because energy is lost as
a. work
c. gravity
b. heat
d. thrust

answer: cesare beccaria developed the classical school of criminology with from philosopher jeremy bentham

explanation:

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