90. The pendulum in the form of a homogeneous sphere, tightly fastened with a thin rod length l is equal to the radius R of the ball, can swing...
7. A ball of mass m = 10 g falls on the horizontal plane with a height h = 27 cm. Find the average force of impact in the following cases: a) the...
89. The man standing in the boat made six steps along it and stopped. How many steps moved the boat when the boat weight twice more (or less) weight...
88. The ball weighing m = 200 g, is suspended on a string of length l = 56 cm, oscillates in a vertical plane. The strength of yarn tension T when...
13. π-meson - an unstable particle. The proper time of his life with 2,6 ∙ 10-8. How far will fly π-meson to decay, if it moves at a speed of 0.9...
15. The proper time of life π-meson 2,6 ∙ 10-8 s. What is the lifetime of the π-meson to the observer with respect to which the particle is moving at...
25. Wrap the disc and slide down the inclined plane at an angle of 30 ° from the horizon. What are their acceleration at the end of the descent? By...
33. The mass of a proton moving 2,5 ∙ 10-27 kg. Find the velocity and kinetic energy of the proton.
35. Determine the velocity of the electron, if the relativistic mass three times the rest mass. Calculate the kinetic and total energy of the...
73. A ball of mass m1 = 16 g, moving horizontally, ran with the ball mass m2 = 0,8 kg, hanging on a direct non-deformable and weightless rod of...
89. A flywheel as a homogeneous solid disc radius R = 35 cm and weighing m = 2,1 kg rotates at n = 360 min-1. After application to disk constant...
46. The system shown in Fig., Consists of two identical homogeneous cylinders, which are wound two symmetrical light filament. Find the acceleration...
57. On a perfectly smooth horizontal surface is the rod length l and mass M. In one of the points of the rod hits the ball of mass m, moving on the...
14. In a weightless block mounted on the edge of the table, slung inextensible thread connecting loads with masses m1 = 1 kg m2 = 2 kg. The table...
67. A ball and a solid cylinder, made of the same material, of equal masses rolling without sliding at the same speed. Determine how many times the...
90. Speed n0 flywheel moment of inertia J is equal to 120 kg • m2 is 240 rev / min. Upon termination of a torque on the flywheel under the influence...
13. The platform has a continuous uniform disk shape can rotate by inertia about a stationary vertical axis. On the edge of the platform is a person...
26. Determine the bulk density of the potential energy of the stretched elastic-copper rod, if the relative change in the length of the rod ε = 0,01...
75. The vessel is filled with water at a rate of 0.5 l / s. Neglecting the viscosity of water, determine the hole diameter in the vessel at which...
83. The horizontal tube of variable section flowing water. The cross-section of the pipe at its various sites, respectively equal to S1 = 10 cm2 and...
84. Determine the height h at which the water rises in the riser pipe, soldered in a narrow portion of a horizontal pipe with a diameter d2 = 3 cm...
86. Determine the difference between the pressures in the broad and narrow (d1 = 9 cm, d2 = 6 cm) horizontal pipe bends, if a wide knee air (ρ = 1.29...
89. A pipe section S1 = 100 cm2 blown air at a speed of 2 m3 / min. The tube has a short section with a smaller cross section S2 = 20 cm2. Define: 1)...
3. The steel ball (density ρ '= 9 g / cm3) with a diameter d = 0.8 cm with constant speed falls in castor oil (density ρ = 0,96 g / cm3, and a...