151-200

The Principle Of Huygens-Fresnel:

• Combines geometric principle of Huygens with ideas about the interference of secondary waves of the Fresnel.

• This dispersion of light.

• This is a purely geometric principle.

• Combines geometric principle of Fresnel's ideas about the interference of secondary waves Huygens.

A body of mass m = 3 kg moves with velocity v= 2 m/s and hits a stationary body of the same weight. The amount of heat liberated in Central and inelastic impact, as well:

• 1J

• 4J

• 3J

• 0,4J;

Find the specific heat of hydrogen at constant pressure.

• 4,25·10⁴ J/(К·kg)

• 1,45·10⁴ J/(К·kg)

• 2,95·10⁴ J/(К·kg)

• 0,75·10⁴ J/(К·kg)

How to behave in the lines of force of the electrostatic field near the surface of the conductor?

• do Not change their direction.

• Trace the surface of the conductor.

• depending on the magnitude of the field.

• Perpendicular to the surface of the conductor.

The refractive index of the substance is equal to 2. Find the speed of light in the substance (с = 310⁸ m/s)

• 1,5·10⁸ m/s.

• 1,2·10⁸ m/s.

• 1,4·10⁸ m/s.

• 1,6·10⁸m/s.

According to the solenoid inductance L = 0,2 Mr flowing current of I = 10A. Determine the energy W of the magnetic field of the solenoid.

• 8

• 10

• 6

• 4

If the number of turns of the coil to reduce 6 times, but retain its dimensions and the current in the coil, the coil inductance:

• decreased by 36 times

• does not change, because It does not depend on the number of turns

• will increase by 36 times

• 6-fold decrease

Determine the period of oscillation of a spring pendulum weighing 40 grams, if the spring rate of 2 N / m.

• 0,02π s

• 0,2π√2 s

• 0,42π s

• 0,04π s

Material point 5 g performs harmonic oscillations with a frequency of 0.5 Hz. . The oscillation amplitude of 3 cm maximum force acting on the point, is equal to:

• 1,48·10^-3 N.

• 0,37·10^-3 N.

• 7,23·10^-3 N.

• 2,15·10^-3 N.

Load weight m1, suspended on a spring oscillates with an angular frequency ω1. What is the angular frequency ω2 fluctuations cargo mass m2 = 4m1, suspended from the same spring?

• ω₂=ω₁/2

• ω₂=2ω₁

• ω₂=ω₁

• ω₂=4ω₁