پرسیاری وزاری فیزیا 2023-2024 خولی یەکەم ، خوێندنی ئینگلیزی

A potter’s wheel, that has the shape of a disk of radius 0.5 m

and mass 80 kg is freely rotating at 4 rad/s.

The potter can stop the wheel in 5 s

by pressing a wet rag against the rim, how much torque 

does the potter apply to
the wheel $\left(I=\frac12mr^2\right)$

Which of the following correctly describe the direction of

magnetic field around straight wire when a direct current
pass through it

Find the angular acceleration of a ball swung at a constant

angular speed of 5 rad/s on a rope that is 0.5 m long

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 center is 2 m/s :

We want to use an ammeter of internal resistance 5 Ω

in order to measure electric currents of intensities up to 10A,

while the ammeter measures currents between ( 0 and 1 A)

What is the resistance of the shunt that should be
connected in parallel with the ammeter in order to do this job

The arm of a crane at a construction site is 12 m long,

and it makes an angle of 60° with the horizontal. Assume
that the maximum load the crane can handle is limited by

the amount of torque the load produces around the base of the arm.

What is the magnitude of the maximum torque

the crane can withstand if the maximum load the crane
can handle is 300 N

A mass is attached to a spring and moves with

simple harmonic motion on a frictionless horizontal surface.

Which of the following is zero at maximum displacement

. A wire 36 m long carries a current of 22 A from east to west.

If the magnetic force on the wire due to earth’s
magnetic field downward (toward Earth) and has a magnetic of 4×10^-2 N,

find the magnitude of magnetic field at this location

A wave whose particles vibrate perpendicular to the direction the wave is traveling, called

A pendulum bob hangs from a string and moves with

simple harmonic motion. Which of the following

does not affect the period of the pendulum

A single circular loop with a radius of 22 cm

is placed in a uniform external magnetic field with a strength of 0.5 T so
that the plane of the coil is perpendicular to the field

The coil is pulled steadily out of the field in 0.25 s.

Find the average induced (𝜀) during this interval

If a sound seems to be getting louder, which of the following is probably increasing

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 tendency of a body rotating about a fixed axis to resist a change in rotational motion

. In the figure Wire 1 carries current I₁ and creates magnetic field B₁, Wire 2 carries current I2
and creates magnetic field B₂ . What is the direction of the magnetic force acting on wire 1
as a result of B₂

Lawand dips his finger into a pan of water twice each second,

producing waves if the distance between two
successive crests is 0.15 m

. Determine the speed of these water waves

Machine that converts electrical energy to mechanical energy

The (Maser) device works In the region of which of the following waves

How many revolutions (rev) equal 270°

If the wavelength of standing wave on a string is 90 cm

What is the distance between two adjacent nodes on that
string

Ohm (Ω) equals to

Which of the following represents Hook’s law

A remote-controlled car’s wheel accelerates at 22.4 rad/s2
. If the wheel begins with an angular speed of 10.8 rad/s,
what is the wheel’s angular speed after exactly three full turns

A wave with an amplitude of 0.75 m has the same wave length as a second wave

with an amplitude of 0.53 m. The two waves interfere.

What is the amplitude of the resultant wave if the interference is constructive

What is the coefficient of self-induction of a pure self-inductor In the
circuit shown in the adjacent figure, If the angle of phase difference between
the electric current and the total potential difference is zero

A wire conducting (a , b) moves at a constant speed (𝑣⃑) in a magnetic
field (𝐵⃗⃑)as shown in the figure, which of the following is correct?

A bicyclist rides along a circular track.

If the bicyclist travels around exactly

half the track in 20 s, what is his average angular speed

How many nodes and antinodes are in the fifth harmonic

(𝑓5) in pipe closed at one end

. A generator coil has 150 turns and a cross-sectional area of 0.35 m2

and the magnetic field in which the coil rotates 8.34×10^-3T 

if its frequency is 89 Hz which of the following

is the equation of instantaneous emf induced (ε) of this generator

Calculate the unknown value in the corresponding table:

The speed of sound depends on the temperature of the medium,

this dependence is more noticeable in:

A capacitor of capacitance 400 μF

is connected in series to a pure resistor of resistance 10 Ω across an AC source
of frequency Hz$\frac{250}\pi$ 

If the effective value of the potential difference across the capacitor is 18 V

Find the effective potential difference across the pure resistor

The distance between center two billiard balls of same masses is 0.3 m,

if the magnitude of the gravitational force between them is 9.05 × 10^-11 N

what is the mass of one of those balls?

$G=6.673\times10^{-11}\frac{N\cdot m^2}{kg^2}$

A fire engine is moving at 50 m/s and sounding its horn of frequency 1500 Hz.

A Van in front of the fire engine is moving at 35 m/s and in the same direction,

what is the frequency that the driver of Van hear
(speed of sound in air 345 m/s)

An AC source of effective value of 90 V is connected

across a parallel combination of resistance of R = 300 Ω,

an inductor of impedance of XL = 600 Ω

and a capacitor of impedance of XC = 200 Ω,

Calculate the value of the effective current of the source?

Because of Earth’s rotation

If the intensity of a sound is
$1\frac w{m^2}$

what is the relative intensity of this sound

What is the ratio of the number of turns of wire

on the primary to the number of turns on the secondary in the
corresponding transformer

Which rotational quantity is equivalent to force in transitional motion

A violin string that is 50 cm long has a fundamental frequency of 440 Hz.

What is the speed of the waves on this string

Two coherent light waves of the same wavelength they interfere,

If the interference is constructive, then the
wavelength of the resultant wave is:

When the ice skater brings his hands and feet closer to his body,

When the net external torque acting on him is zero.

Which of the following is true for

[ his moment of inertia (𝐼) , his angular speed (𝜔) , his angular momentum (𝐿)]

We can express the unit of the magnetic field (Tesla T) in which of the following

If the angle of phase difference between two coherent waves is (6 𝜋 𝑟𝑎𝑑)

the path difference between two waves is

A 700 N window washer is standing on a uniform scaffold supported by a vertical rope at each end.

The scaffold weighs 200 N and is 3 m long. What is the force in the rope

that is nearest to the window washer if he stands1 m from one end

. A direct current of 10 A passes thought a solenoid, i

f the magnitude of magnetic field in the middle of the solenoid is

$\frac\pi{40}T$

calculate the number of turns per unit length: (μ=4πx10^-7T.m/A)

Which of the following is not an essential component of a lase

The corresponding figure represents the angle of phase
difference between the current intensity and the alternating
potential difference for which of the following

Suppose an electron is chasing a proton to the north

when suddenly a magnetic field pointing the south is applied.
What would happen to the particles

Monochromatic light from a laser source (helium-neon) of wavelength λ =632.8 nm

shines at a right angle to the surface of a diffraction

grating that contains 150 500 lines/m.

Find the angle at which one would observe the first order bright fringe