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12. The point moves on a circle with a radius of R=4 m. The law of her movement is expressed by S=A+Dt2 equation where m A=8, In =-2 m / с2. To define t timepoint when normal acceleration of an of a point is equal to 9 m / с2. To find  speed, tangential a and full and accelerations of a point in the same timepoint of t.
31. The block having the disk form the mass of m=0,4 of kg rotates under the influence of force of a tension of a thread by which ends freights are suspended by the mass of m=0,3 of kg and m=0,7 of kg. To determine forces of a tension of T1 and T2 of a thread on both sides of the block.
50. Intensity of the ultrasound used for treatment of diseases of joints at cattle makes 1,2. 104 W/sq.m. What amount of energy undergoes in a body of an animal with duration procedures of 10 min. if the area of the vibrator - 12 cm2?
69. To find number of molecules in unit of volume of nitrogen and its density with a pressure of 1,33 np and temperature of 17 °C.
88. To determine the amount of heat which has passed within 5 min. through a layer of grain 2 m thick and of 1,5 sq.m if a difference of temperatures of the top and lower surfaces 4 0C. Coefficient of heat conductivity of grain - 0,174 J / (m • with • К).
107. At an electric eel the body for accumulation of electric energy represents a peculiar battery of the condensers charged to 800 V. Moshchnost´ potential of the category - 1 kW. Including category time equal 10-4 with to determine the capacity of this battery of condensers.
126. The chain of alternating current with a frequency of 50 Hz has consistently included the ohmic resistance of 20 Ohms, the solenoid by inductance of 3 G and the condenser with a capacity of 20 мкФ. To determine the full resistance of a chain.
145. Over the center of a round table with a diameter of 1,5 m at the height of 1 m the dot source which luminous intensity - 100 cd is suspended. To define illumination of a surface of the table edge
164. For extermination of wreckers of grain in the granary So60 in the form of a wire weighing 1 g is used. Content of radioactive cobalt in a wire makes 0,01% of the mass of a wire. To define activity of radioactive cobalt.


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