(b) a monkey sitting on top of a man cycling smoothly on a circular track.
(a) a railway carriage moving without jerks between two stations. Q:- In which of the following examples of motion, can the body be considered approximately a point object:.
Compare the magnitude of the displacement with the total path length covered by the motorist in each case. Starting from a given turn, specify the displacement of the motorist at the third, sixth and eighth turn. On an open ground, a motorist follows a track that turns to his left by an angle of 60° after every 500 m.
#SODIUM ATOM FREE#
(e) a high-speed electron in space far from all material objects, and free of electric and magnetic fields. (d) a car moving with a constant velocity of 30 km/h on a rough road (c) a kite skillfully held stationary in the sky (b) a cork of mass 10 g floating on water (a) a drop of rain falling down with a constant speed Q:- Give the magnitude and direction of the net force acting on.What is the direction in which she should hold her umbrella? A woman rides a bicycle with a speed of 10 m s –1 in the north to south direction. Rain is falling vertically with a speed of 30 m s –1. What is the percentage error in the quantity P ? If the value of P calculated using the above relation turns out to be 3.763, to what value should you round off the result ?įill in the blanks by suitable conversion of units: The percentage errors of measurement in a, b, c and d are 1%, 3%, 4% and 2%, respectively. The properties of liquid sodium metal make it useful as a coolant in fast breeder reactors and as a heat transfer agent for very high temperature reactions.State the number of significant figures in the following:Ī physical quantity P is related to four observables a, b, c and d as follows : It is used in the manufacture of soap, the refining of petroleum, the manufacture of paper, textiles, rayon, cellulose film, and many other products. Called caustic soda, it is very corrosive to the skin. Sodium hydroxide (NaOH) is a very important laboratory reagent and a widely used industrial chemical. Sodium sulfate is found in mineral form as Thenardite.Ī phosphate of aluminum and sodium is Wardite. 5H 2O) along with tincalconite form vast deposits of boron in California. 4H 2O), and colemanite (calcium hexaborate pentahydrate, Ca 2B 6O 11. 10H 2O), kernite (sodium tetraborate tetrahydrate, Na 2B 4O 7. Sodium borates such as borax (sodium tetraborate decahydrate, Na 2B 4O 7. Sodium chloride is used for the extraction of metallic sodium and gaseous chlorine, as well as for preparation of other compounds of these elements. It is important as an electrolyte in human blood and plasma, which contain about 0.9 grams of NaCl per 100 ml. In crystalline form it is given the mineral name halite. Comprising 3% of sea water and also occurring in large solid deposits and underground salt brines, NaCl is an abundant mineral. The most important compound of sodium is sodium chloride, NaCl (common table salt). It is a constituent of the plagioclase form of feldspar, one of the most abundant minerals on the earth. Sodium is one of the big 8 elements in the Earth's crust, being the sixth most abundant element at about 2.8% by weight. Sodium, like the other alkali metals (Group I), is a sivery-white metal of very high chemical reactivity.