(Q).
The trade-off when the threads are closer together, is that more turns of the screw or bolt are needed to do the job because the distance over which the input force must be applied is greater. Harry was installing a TV mount. He drills into the wall with a screw that has 30 threads. If he used a screw of the same size with 20 threads, it would take fewer or more turns to put it in?
(A).
fewer

(Q).
Developing nations will also increase demands on natural resources as they build more factories. When a country starts manufacturing things they need to have less resources or more resources?
(A).
more resources

(Q).
When a volume of water is cooled, the molecules move less vigorously, so same number of molecules takes up less space and the water is denser. When we lower the temperature of water it becomes less dense or more dense?
(A).
more dense