Displacement vectors of 10 m west and 14 m west make a resultant vector that is

Apulley system lifts a 500-ib block 1.0 foot with an effort of only 50 ib. if the 50 ib moves 30 feet, calculate the efficiency of the pulley system. a. 30% b. 33% c. 70% d. 67%

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f