فیزیا 2021-2020 خولی دووەم خوێندنی ئینگلیزی

A bucket filled with water has a mass of 22.5 kg and

is attached to a rope that is wound around a cylinder with a radius of 0.05 m at the top of a well

What torque does the bucket produce on the cylinder

A wave that requires a medium through which to travel

Two spheres have the same mass One is hollow, and the other is solid. Which method would determine which is which

A car traveling at 65 km/h on a flat surface turn in a circle with a radius 195 m, Find the minimum coefficient of  static friction between the tires and the road that will allow the care to round the curve

a_g=9.81m/s²

Find the direction of the magnetic force on the current –carrying
wire as in Figure

When a mechanical wave of amplitude is tripled, the energy the wave carries in a given time interval is increased by a factor of

According to Lenz’s law, if the applied magnetic field of circuit is changed

the induced field attempts to keep the total field is

When you break a magnet in half, how many poles does each piece have

Which of the following equations is correct to calculate the angular momentum

If the coefficient of self-induction of the coil is 0.02 H, and If time rate of increase current is 100 A/s calculate the
induced emf in the coil

If the intensity of a sound is 1W/m² what is the relative intensity of this sound

Which of the following wavelengths will produce standing waves on a string that is 3 m long

Three identical vibrating simple pendulum of same length the first one on surface
of the Earth [a_g=9.81m/s²], the second one on the surface of the moon [a_g=1.63m/s²] and the third one on the surface of the Mars[a_g=3.7m/s²]

? Which one of them has greater period

The unit for measuring Magnetic flux(Φ) is

A wave traveling in the positive 𝑥 direction with a frequency of 25 Hz as shown in the figure. Find the speed of this wave

A mass is attached to a spring and moves with simple harmonic motion on a frictionless horizontal
surface in what form is the energy in the system when the mass is at maximum displacement

A wire 36 m long carries a current of 22 A. If the magnetic force on the wire due to Earth’s magnetic field has a magnitude of 4 × 10-2 N, find the magnitude of the magnetic field at this point

Identify the source of force that maintains circular motion of (a bicycle moving around a flat circular track)

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 waves if the interference is constructive

In which situation, the direction of the magnetic force
on a proton moves in a magnetic field is to left of the page

is the perpendicular distance from the axis of rotation to…..

a line drawn along the direction of the force

The sound waves with frequencies greater than 20 kHz, and cannot be heard by human ear are called,

At a maximum level of loudness, the power output of a 75-piece orchestra radiated as sound is
70 W. What is the intensity of these sound waves to a listener who is sitting 25 m from the orchestra

If the radius of car tire is 0.3 m rotates at an initial angular speed of 14 rad/s. The driver accelerates, and after 3.5s  the tire’s angular speed is 28 rad/s. What is tangential acceleration of a point at the edge of tire

? What are the first two harmonics in a 2.45 m long pipe that is closed at one end

(The speed of sound in pipe is 345 m/s)

The magnitude of the induced electromotive force (ε) in a straight conductor(wire)

depends on which of the following

Earth of mass (m=597×10²⁴kg) orbits the sun with mass (m=1.99×10³⁰kg) at a mean distance of  1.5×10¹¹m. what is the gravitational force of the sun on Earth? (G=6.673×10^-11 N.m²/kg²)

A police car moves at a speed of 86.4 Km/h and emit a siren of frequency 1000 Hz. What is the frequency
of the sound as detected by a standing observer as the police car moves away from him
?(speed of sound in air is 340 m/s)

:The speed of sound depends on the temperature of the medium, this dependence is more noticeable in

Find the tangential speed of a ball swung at a constant angular speed of 5 rad/s on a rope that is 0.5 m long

.Earth is rotate 360o every 24h what is the angular displacement of a person standing at the equator for 3 h

A bicyclist exerts a constant force of 40 N on a pedal 0.15 m from the axis of rotation of a bicycle wheel with a

? radius of 50 cm. If his speed is 2.25 m/s after 3 s he starts from rest, what is the moment of inertia of the wheel (Disregard friction and the moment of inertia of the other wheel

A uniform 40 N board supports two children, one weighing 510N and the other weighing 340 N. The support is under the center of mass of the board, and the 510 N children is 2 m from the center. Where should the second child sit to balance the system?

By what factor does the distance change from the sound source If the sound intensity becomes five times as the ? original intensity

?Which of the following ways can induce a current inside a closed circular loop

The symbol(μ) in this equation B=μ/2π=1/d is called Coefficient of

A wire carrying a current is arranged so that electrons flow in one segment from west to east.

?If a compass is held over this segment of the wire, in what direction is the needle deflected

.The tub within a washer rotate with angular speed of 11 π rad/s then the tub slows to rest in 12 s , how many
revolutions does the tub turn until the tub stops

.In which of the following should the object (s) be treated as an extended object

Which of the following is a correct interpretation of the expression

[The magnetic field due to a direct current in a solenoid]

A fire engine is moving at 40 m/s and sounding its horn. Another car in front of the fire engine is moving

at 30m/s in the same direction and a van in front of the car is stationary who observer hears the fire engine’s horn at a higher pitch

At a circus performance, a juggler is throwing two spinning clubs. One of the clubs is heavier than the other
Which of the following statements is true

..……law Used to determine the magnitude of induced electromotive force (emf)

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

The speed of all electromagnetic waves in empty space is 3 ×108 m/s. Calculate the wavelength
of radio waves at frequency 88 MH

?The mutual inductance between two coil depends on what

Eddy currents are used in

When a wheel is rotated through an angle of 35°, a point on the circumference travels through an arc length of   2.49 m, what is the angular displacement of the same point when travels through an arc length of 143 m

A pendulum vibrates after uniform so that its frequency changes from 10 Hz to 30 Hz, in this case its period from (T) second will change to

A rectangular coil with area 0.0046 m² is positioned so that its cross-sectional area is perpendicular to the
direction of a magnetic field,B⃑ if the coil has 75 turns and a total resistance of 8.6 Ω and the field decreases
at a rate of 3 T/s, what is the magnitude of the induced current in the coil