Compounds of boron with hydrogen are called boranes. One of these boranes has the empirical formula and a molecular mass […]
Monthly archives: July 2016
1 Malonic acid is used in the manufacture of barbiturates (sleeping pills). The composition of the acid is 34.6% C, 3.9% […]
Malonic acid is used in the manufacture of barbiturates
Hydroquinone used as a photographic developer, is 65.4% C, 5.5% H, and 29.1% O, by mass. What is the empirical […]
Hydroquinone used as a photographic developer
1 An oxide of tungsten (symbol W) is a bright yellow solid. If 5.34 g of the compound contains 4.23 g […]
An oxide of tungsten
The bolt is subjected to the force F, which has components acting along the x, y, z axes as shown. […]
The bolt is subjected to the force F
2 The stock mounted on the lathe is subjected to a force of 60 N. Determine the coordinate direction angle β […]
The stock mounted on the lathe is subjected
2 If the magnitude of the resultant force acting on the bracket is to be 450 N directed along the positive […]
If the magnitude of the resultant force acting
2 Determine the magnitude of force F so that the resultant of the three forces is as small as possible. What […]
Determine the magnitude of force F
4 Determine the magnitude of F1 and its direction θ so that the resultant force is directed vertically upward and has […]