02:10
005-020 What work did the body perform if the kinetic energy decreased by 12 J?
03:00
005-019 How much does the kinetic energy of a body change when its speed changes?
03:43
005-018 How do the kinetic energies of a car and a trailer compare?
02:20
005-017 What speed did the body acquire if its kinetic energy became 3200 J?
02:07
005-016 How many times will the V of a body change if its kinetic energy decreases by 9 times?
01:36
005-015 How many times will the kinetic energy of a body change if its speed is increased by 4 times
02:00
005-014 How to determine the kinetic energy of a projectile moving with velocity?
02:40
005-013 Determine the kinetic energy of a car with a mass of 1 t, moving with V 108 km/h
04:03
005-012 How to determine the kinetic energy of a space station?
03:17
005-011 Which has more kinetic energy: 1 mΒ³ of water or 1 mΒ³ of wood?
02:33
005-010 What will be the potential energy of a spring if it is stretched to ΒΌ of its length?
03:37
005-009 By how much is the WΡ of the deformed spring in the second state greater than in the first?
02:28
005-008 How to find Wβ/Wβ of a spring if it is compressed by 5 cm and then stretched by 5 cm?
04:28
005-007 How to find the spring stiffness coefficient if its Wp is 0.4 J.
04:45
005-006 What will be the Wp of the spring if it is compressed by 5 cm?
03:11
005-004 How much will the Wp of a pencil change if it is placed vertically?
04:11
005-003 At what altitude will the helicopter's Wp increase by 245 kJ?
02:55
005-005 To what height should a 2 kg body be raised so that its Wβ increases by 19.6 J?
01:52
005-002 What W, relative to the Earth, does a person with a mass of 100 kg have at a height of 30 m?
06:04
005-001 What work must be done and what force is needed to lift a sleigh up a mountain?
08:28
004-060 What force does each support exert on the rod?
07:54
004-059 Where should the support be installed so that the rod is in equilibrium?
07:16
004-058 What are the pressure forces on each support?
03:55
004-057 What is the length of the lever if it is in equilibrium?
04:45
004-056 At what distance should the support be placed so that the lever is in equilibrium?
05:09
004-053 Determine what forces act on the supports?
02:28
004-055 What force must be applied to lift the rod?
05:36
004-052 How to find the resultant and its point of application?
03:03
004-054 What is the mass of the board?
04:05
004-051 How to find the resultant force and its point of application?
13:32
004-050 How to find the common center of gravity of balls?
01:55
004-049 With what force is the cable C pulled if the weight of the load is 100 N?
02:23
004-048 What force must be applied to cable C so that cable B is tensioned with a force of 1 kN?
07:09
004-047 What must mβ be equal to in order for m to move upward?
03:52
004-046 Calculate the pressure of the worker on the support if the area of ββthe feet is 320 cmΒ²?
08:42
004-045 What weight will the scale register during the movement of goods?
03:49
004-044 What is the mass of body 1 if both bodies move uniformly?
09:16
004-043 How to determine a, with which both bodies move, and T, the tension of the thread?
03:45
004-042 How to find the acceleration with which the weights move and the tension force of the thread
03:08
004-041 Determine the dynamometer readings if the weight of each ball is 10 N?
06:45
004-040 a, T of the load and t, at which time the load reaches the floor?
02:18
004-039 What force must be applied to make the cable stretch with a force of 4000 N?
02:48
004-038 What weight of load must be attached to the cable so that the block system is in equilibrium
03:16
004-037 What is the largest load a boy can lift?
03:43
004-036 Do equal forces need to be applied at points B and B1?
02:23
004-035 Will the system be in equilibrium?
02:12
004-034 What should dynamometer 2 show?
03:27
004-033 Which system of fixed blocks requires greater force to lift?
02:03
004-032 In what case will the dynamometer show less force?
03:54
004-031 Where is the fulcrum if the lever is in equilibrium and forces act on it?
03:16
004-030 How to determine the length of a lever if the lever is in equilibrium?
03:34
004-029 How to determine the length of the larger arm?
03:36
004-028 With what force is the muscle (biceps) stretched when lifting a core weighing 80 N?
02:57
004-027 How to determine the force acting on a nail?
03:23
004-026 What force must be applied to the larger arm to balance the lever?
03:07
004-025 With what force is the dynamometer spring tensioned if the weight of each load is 1N?
03:57
004-024 What mass must be taken to bring the lever into balance?
04:05
004-023 What is the length of the lever if the length of the smaller arm is 20 cm?
02:59
004-022 The lever is in balance. What force is applied at point 1?
03:22
004-021 What F must be applied to the end of the lever for it to be in equilibrium?
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