Question

What is the weight in newtons of an object that has a mass of (a) 8 kg, (b) 0.04 kg, and (c) 760 Mg? 1–2. Represent each of the following combinations of units in the correct SI form: (a) kN>ms, (b) Mg>mN, and (c) MN>(kg · ms). 1–3. Represent each of the following combinations of units in the correct SI form: (a) Mg>ms, (b) N>mm, (c) mN>(kg · ms).

Answer 1

1-1)- Weiht is defined as force exerted on a body by gravity

mass of object = m

gravitational accleration = g = 9.81 m/s²

weight W = mg

and 1 newton (N) = 1 kg m/s²

so that

a)- m = 8 kg

w = 8x9.81 = 78.5 N

b)- m = 0.04 kg

w = 0.04x9.81 = 0.392 N

c)- m = 760 Mg = 760x 10³ kg

w = 760x10³x9.81 = 7455600 N

1-2)- =

a)-

  

  b)-

  

c)-  

1-3)

a)-

b)-

  

c)-