Question #3: Suppose that in Einstein's equation E = mc, the mass m is in kg and velocity of light c is in m/s (a) What are the SI units of E? (b) If the value of E in SI units is 20, what is its value in USC base units? Question # 4: Convert a torque value of 47 lb.in into SI units. Question #5: Carry out the following calculations and express the final results in SI units with appropraite prefix: (a) (50 mN)*(6 GN) (b) (400 mm)*(0.6 MN)