فیزیا 2021-2020 خولی یەکەم خوێندنی ئینگلیزی

A bar magnet is positioned near a coil of wire, as shown in figure.
What is the direction of the current in the resistor R when the magnet is
moved to the left

The Doppler effect occurs in all but which of the following situations

If an object is in the state of rotational equilibrium which of the following is true

0=α

When a part of a sound wave travels from air into water, which property of the wave remains unchanged

A straight segment of wire has length of 25 cm and carries a current of 5 A, If the wire is perpendicular to
a magnetic field of 0.6 T, what is the magnitude of the magnetic force on this segment of the wire

A disk of mass 0.5 kg and radius 0.1 m rolls without slipping on an inclined plane. What is the total kinetic
energy of the disk at the instant when the instantaneous speed of its centre is 1 m/s ( I = 1/2 m/r²)

Which of the following is the component of the magnetic field perpendicular to the plane of the loop.
θ is the angle between the direction magnetic field and the normal to the plane of the loop

 A uniform disk of mass 5 kg and radius 0.1 m rotating at angular speed of 20 rad/s calculate its angular momentum of the disk

What kind of wave does this graph represent?

A parked ambulance emits a sound of frequency 1200 Hz. What frequency is detected by an observer inside another car moving with a velocity of 72 km/h. when he move towards the ambulance. (Speed of sound in air is 340 m/s)

A baseball coach shouts loudly at an umpire standing 5 m away. If the sound power produced by the
coach is 3.14 × 10^-3 W, what is the decibel level of the sound when it reaches the umpire

Which of the following sound waves travel faster in the air

A pipe that is open at both ends has a fundamental frequency of 456 Hz when the speed of sound in air is

331 m/s. What is the fundamental frequency of this pipe when the speed of sound in air is increased to 367 m/s as a result of increasing the temperature of the air in the pipe

The magnetic field of solenoid depends on which of the following factors

Which type of interference will happen When two, pulses meet, (as shown in the figure)

What happens to the wavelength of a wave on a string when the frequency is doubled? What happens to the speed of the wave

A pair of adjacent coils has a mutual inductance of 1.06 H. Determine the average emf induced in the
secondary circuit when the current in the primary circuit changes from 0 A to 9.5 A in a time
interval of 0.0336s

The combination of an applied force and a frictional force produce a constant torque of 36 N.m on a wheel rotating about a fixed axis. The applied force acts for 6 s , during this time the angular speed of the wheel increases from 0 to 12 rad/s. Then the applied force is removed, and the wheel comes to rest in 65 s, what is the frictional torque

The unknown quantity in the corresponding table is equal

An electric current travers a one loop circular coil of diameter 50 cm. Calculate the intensity of the current  if the magnitude of the magnetic field at the center of the coil is 2π × 10⁻⁵T ,[µₒ=4π × 10^-7 T.m/A]

If we increase the length of the pedal arm then the amount of torque applied to moving the front wheel of a
bicycle will

A uniform 4.14 m long horizontal beam (b) that weighs 392.9 N is attached to a wall by a pin connection that allows the beam to rotate. Its far end is supported by a cable that makes an angle of 53° with thehorizontal, and a 560 N person (P)is standing 1.5 m from the pin,
Find the tension force (FT) ,of the cable ( If beam is in complete equilibrium) as shown in figure

An air solenoid of length l0 cm, cross -sectional area 24.88 cm², and 400 turns. Calculate the coefficient of self induction of solenoid [µₒ=4π × 10^-7 T.m/A]

The machine that converts mechanical energy into electric energy is called

Determine the change in gravitational force between two masses if the distance between two
masses is doubled

What is the restoring force of the (mass-spring) system

 In the figure use the movement of the positively charged particle and the direction of the magnetic force acting on it to find the direction of the magnetic field

 Henry (H) =……….

A point on rim of CD in a computer has tangential speed of 1.8 m/s, If radius of CD is 0.06 m what is the   tangential speed of a point on this CD that is 0.03 m from axis of rotation

 Which of the following features of a given pendulum changes when the pendulum is moved from Earth’s surface ? to the Moon

. An alpha particle (q=3.2 × 10^-19 C) moves at a speed of 2.5×106m/s perpendicular to a magnetic field of strength 2 ×10^-4 T. What is the magnitude of the magnetic force on the particle

 If the motor’s coil turns faster then

?What is the length of a simple pendulum, its frequency is 0.525 Hz ,If a_g=9.81 m/s²

A mass attached to a spring vibrates back and forth, about equilibrium position, at maximum displacement, the restoring force and the

The rate at which a body rotates about an axis

All points on a disk rotating around a fixed axis, have the same

If a pendulum clock is running slow, what must be done to correct the time

The unit of magnetic field B is

When a wheel is rotating through an angle of 35°, a point on the circumference travels through an arc length  of 2.5 m. What is the radius of the wheel

A 0.77 kg mass attached to a vertical spring stretches the spring 0.3 m. What is the spring constant

 A solid ball with a mass of 4.1 kg and a radius of 0.05 m starts from rest at a height of 2 m and rolls down a 30o
slope. What is the translational speed of the ball when it leaves the incline

A bicyclist rides along a circular track. If the bicyclist travels around exactly half the track in 10 s, what is his average angular speed

Which of the following is a correct interpretation of the expression

 a_g = g = G(m_e/r²)

Rapidly inserting the north pole of a bar magnet into a coil of wire connected to a galvanometer causes the needle of the galvanometer to deflect to the right, what must be done to the needle of the galvanometer to the left

If a spinning amusement-park ride has an angular speed of I.2 rad/s, what is the centripetal acceleration of a person standing 12 m from the Centre of the ride

The angle between the direction of centripetal force F_c⃑⃑⃑  and the direction of centripetal acceleration a_c⃑⃑⃑ is equal to

 At the time of producing standing wave in which of the following does number of antinodes is greater than
number of nodes

? Which rotational quantity is equivalent to mass in transitional motion

? What is the longest wave length of a standing wave of in pipe closed at one end, its length is L

 The galvanometer can be converted to a voltmeter by connecting a resistor of………. to the galvanometer