(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 items in the following list are all units of matter. which is the smallest unit that retains the properties of the matter? a.) atom b.) compound c.) electron d.) element

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.

In the cores of extremely hot red giants, nuclear reactions convert helium to