Asimple viscometer can be constructed as in the drawing. a mass of 10 g pulls a block of mass 1 kg on a thin layer of oil of thickness 0.1 mm. the dimensions of the block are height 10 cm, length in the plane of the picture 20 cm and width into the picture 10 cm. m l h oil thickness = h m a. if the block moves to the left with a velocity of 10 cm/sec, what is the viscosity of the oil in cp? b. if the mass on the pulley were increased to 100kg, would this method of measuring viscosity still be appropriate? why or why not? the actual measurements of the velocity (in cm/sec) were 10, 10.1, 9.8, 9.9 and 10.1. c. what is the best estimate of the viscosity in cp? d. what is the uncertainty in the estimate of the viscosity in cp?

During physical science, ms. greene challenged her students to produce an energy transformation. james and jill wrapped a 4-inch nail with a coil of fifty turns of wire. they connected one end of the coil to one terminal of a knife switch. they connected the other terminal of the knife switch to the battery. finally, they connected the end of the coil to the other terminal of the battery. james held the tip of a 1-inch nail near the flat end of the 4-inch nail. jill closed the knife switch quickly and then opened it. the 1-inch nail was pulled toward the 4-inch nail. what is the best explanation of why the nail moved? a) electrical energy was converted to mechanical energy in the 1-inch nail. b) the 4-inch nail became an electromagnet and the magnetic force attracted the 1-inch nail. c) the electric current in the 4-inch nail was converted to mechanical energy in the 1-inch nail. d) the 4-inch nail had a positive charge and the 1-inch nail had a negative charge. opposites attracted.

Wave functions describe orbitals in a hydrogen atom. each function is characterized by 3 quantum numbers: n, l, and ml. if the value of n = 2: the quantum number l can have values from to . the total number of orbitals possible at the n = 2 energy level is .

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.