(b) A gate has rusty hinges that are very still. A man opens the gate by pulling on it, as shown in Fig. 1.1
Fig. 1
After he has passed through the opening, he closes the gate behind him.
When closing the gate, the man pulls it at a point halfway along its length.
State two differences between his force, when closing the gate and his force when he opened
the gate
?
2
[2]

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.

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.

What does si stand for,when referring to a system of measurement