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A certain gasoline weighs 46.5 lb/ft3 . What are its mass density, specific volume and specific gravity?
The specific gravity of ethyl alcohol is 0.79. Calculate its specific weight (in both pounds per cubic foot and kilonewtons per cubic meter) and mass density (in both slugs per cubic foot and kilograms per cubic meter).
A 3.5-kg computer printer is pushed at a constant velocity across a desk with a horizontal force. The coefficient of kinetic friction between the printer and the desk is 0.36.
a) Calculate the magnitude of the normal force acting on the printer.
b) Calculate the magnitude of the kinetic friction acting on the printer.
The normal force between a snowmobile and the snow has a magnitude of 2200 N; the horizontal force needed to get the snowmobile to just start moving has a magnitude of 140 N. Calculate the coefficient of static friction is this case
It takes 36 sec for 0.01 moles of He to effuse through a pinhole in an effusion
apparatus. It takes 72 sec for 0.01 moles of another gas to effuse through the
same system. What is the molecular weight of the unknown gas?
A triode passes a plate current of 5mA at plate voltage 150V and grid voltage of -2V. If the grid voltage is changed to -35V, the plate current drops to 3.2mA but can be restored to 5mA by increasing plate voltage to 195V. Calculate
(1) mutual conductance
(2) a.c. plate resistance
(3) amplification factor
An object is placed 20cm from a converging lens. If the real image formed is 80.0cm from the object, the focal length of the lens is
What happens to the force between two charged metal spheres in a vacuum if the charge on each is doubled and the distance between them is multiplied by three.
An object is placed 20cm from a converging lens if the real image formed is 80.0cm from the object, the focal length of the lens is ?
A charge of 12 uC when placed in electric field experiences a force of 648 N. What is the magnitude of the electric field strength.
