A0.600-mm diameter wire stretches 0.500% of its length when it is stretched with a tension of 20.0 n. what is the young's modulus of this wire?
a) 6.43 × 109 n/m2
b) 1.41 × 1010 n/m2
c) 5.66 × 1010 n/m2
d) 2.78 × 109 n/m2
e) 3.54 × 109 n/m2

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.