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Physics Questions and Answers October 14, 2019

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What keeps a stellar core ( after death of the star ) which is 0 . 5 Mo from collapsing due to gravity?gas pressureradiation pressureNeutron Pressure ( Strong Nuclear Force ) no known forceelectron pressure
What keeps a stellar core ( after death of the

At time t = 0 , what is the magnetic flux through one turn of coil 2 ? Remember that all turns of coil 1 contribute to the magnetic field. Note also that the coils are not very far apart ( compared to their radii ) , so you can't use an approximate formula here. At t = 0 1 t u r n = T . m 2
At time t = 0 , what is the magnetic flux through

What is the total work done on him while he is moving from the bottom to the top of circle of the wheel? - m g R m g R - 2 m g R 0 2 m g R
What is the total work done on him while he is

If 1 8 0 0 J of heat are added to a 1 9 0 - g object, its temperature increases by 1 0 C . What is the heat capacity of this object? What is the object's specific heat?

Liquid with a density of 1 1 1 5 k g m 3 flows in a horizontal pipe. In the first segment of the pipe, the flow speed is 5 . 3 3 m s . In a second segment, the flow speed is 3 . 1 7 m s . What is the difference between the pressure in the second segment ( p 2 ) and the pressure in the first segment ( p 1 ) , i . e . p 2 - p 1 ? 0 . 1 1 1 0 4 P a 1
Liquid with a density of 1 1 1 5 k g m 3 flows in

What power output P would a star with a mass 3 7 . 4 times that of our Sun need to have in order to be unable to pull in a 4 . 0 5 ug dust particle of radius rp = 0 . 5 4 6 mm , assuming the particle absorbs all the light incident on its nr ? cross - section?

Please its urgent! Physics 2 8 0
Please its urgent! Physics 2 8 0

While a person lifs a book of masa 2 kg from the floor to a tabletop, 1 . 5 m above the floor, how much work does the gravitational forse do on the book? a ) - 3 0 J c ) 0 J e ) 3 0 J b ) - 1 5 J d ) 1 5 J
While a person lifs a book of masa 2 kg from the

Constant worry is a key feature of

What is the speed of a proton after being accelerated from rest through a 5 . 3 1 0 7 VV potential difference?

The front and back clocks in a spaceship traveling at relativistic speeds are both reading 1 2 : 0 0 PM according to passengers in the spaceship. However, according to observers on earth, the front and back clocks might respectively read, Group of answer choices 1 2 : 0 0 PM and 1 2 : 0 5 PM 1 2 : 0 0 PM and 1 1 : 5 5 AM 1 2 : 0 0 PM and 1 2 : 0 0

A ball of mass 0 . 2 9 5 kg that is moving with a speed of 7 . 2 m / s collides head - on and elastically with another ball initially at rest. Immediately after the collision, the incoming ball bounces backward with a speed of 3 . 1 m / s .

A block of mass 7 kg slides down ramp 1 with a height of 4 m . It then slides for 2 m on a surface with a kinetic coefficient of friction of 0 . 2 . Next the block slides up a frictionless ramp 2 . What is the potential Energy of the block at the top of Ramp 1

A rock of mass M with a density three times of the water is sitting on the bottom of an aquarium tank filled with water. How much force is needed to lift the rock inside the aquarium? A ) Mg B ) Mg / 3 C ) Mg / 2 D ) 2 Mg / 3 E ) zero

You are having a family holiday dinner with your extended family: grandparents, aunts, uncles, cousins, etc. The conversation turns to your studies in physics, and you tell everyone about your studies about fusion reactions in the Sun. One of your nephews says, Oh , yeah? I think the Sun is just a big ball of gasoline burning away. How can you

A very long, thin rod carries electric charge with the linear density 2 8 . 0 nC / m . It lies along the x axis and moves in the x direction at a speed of 1 5 . 0 Mm / s . ( a ) Find the electric field the rod creates at the point ( 0 , 2 2 . 0 cm , 0 ) . Magnitude: N / C Direction: - - - Select - - - + y axis - y axis + z axis - z axis ( b ) Find

In the 4 He atom, when the 3 rd orbital electron jumps to the 1 st orbit, what is the photon energy being emitted?

A pebble of mass 3 4 . 8 g . It is dropped from the deck of a docked cruise ship. The deck of the cruise ship is 2 2 . 8 m above the water, and the pebble is caught 3 . 9 m above the water b a persons standing on the dock. Assume g = 9 . 8 1 m / s 2 . a ) how much work, in joules, is done on the pebble by gravity? b ) what is the change in

A resistor and inductor are connected in series across an ac generator. The emf of the generator is given by v ( t ) = V 0 cost , where V 0 = 1 2 0 V and = 1 2 0 rad / s; also, R = 4 0 0 and L = 1 . 5 H . ( a ) What is the impedance of the circuit? ( b ) What is the amplitude of the current through the resistor? ( c ) Write an expression for the

A 3 4 6 - resistor, an uncharged 4 . 3 5 - F capacitor, and a 6 . 0 3 - V emf source are connected in series at t = 0 ms . What is the instantaneous power to the capacitor after 3 time constants? Calculate your answer in the units of milli - watts ( mW ) . Hint: Instantaneous power is the product of instantaneous potential drop and instantaneous

If we submerge both balloons and 1 m of water, discuss what would happen to both balloons use the concepts of density pressure volume and Ball to justify your answer

One end of the wire is anchored to the side of a building, and the other end is attachedat an angle of 2 7 \ deg to a light horizontal bar from which a 7 5 - kg sign hangs. The linear mass density of thewire is 0 . 0 6 7 kg / m . If the wind causes the sign to vibrate so that a wave travels along the wire, at whatspeed does the wave travel? Free

The electric field strength 2 5 cmcm from the center of a uniformly charged, hollow metal sphere is 1 4 , 0 0 0 N / CN / C . The sphere is 8 . 2 cmcm in diameter, and all the charge is on the surface.

The small ball of mass m and its supporting wire become a simple pendulum when the horizontal cord is severed. Determine the ratio of k of the tension

Consider the case where you incorrectly measure the radius of your wheel. The wheel's true radius is 1 0 cm , but you measured it to be 1 0 . 5 cm . All other factors and measurements are the same. Compared to the true angular velocity, what effect would this have on your measurement of the angular velocity?

A 2 . 0 0 kgkg frictionless block attached to an ideal spring with force constant 3 6 5 N / mN / m is undergoing simple harmonic motion. When the block has displacement + 0 . 2 0 0 mm , it is moving in the negative xx - direction with a speed of 5 . 0 0 m / sm / s . Find the amplitude of the motion. Express your answer with the appropriate units.

a person tosses a red ball from y = 4 meters above the floor with a speed of 1 0 m / s at an angle of 3 0 degrees , The ball lands in the black bucket on the slope. If the angle theta = 3 0 degrees where should ( d ) the bucket be placed

A particle is confined to move on a circle with radius R but is otherwise free. We can parameterize points on this circle by using the distance x from a reference point or by using the angle = x / R . Since x = 0 and x = 2 R describe the same point, the wave function must satisfy ( x ) = ( x + 2 R ) and ( x ) = ( x + 2 R ) .

Which statement about symmetry is NOT correct? Time translational symmetry implies energy conservation. Spatial translational symmetry implies momentum conservation. Rotation symmetry implies angular momentum conservation. Rotation symmetry implies parity conservation.

What was the change in the ratio between 1 9 7 9 and 1 9 9 5 ? What might explain this change ( or lack thereof ) ?

Two identical 1 Kg masses are joined together and are being pulled by a dynamometer. They move at a constant rate when a 4 N force is applied. How large is the frictional force

Due to an unfortunate mistake, Britney ends up on a desert island. She decides to build herself a pan flute to make the stay more fun. She needs to get tones that go from C ( 2 6 1 Hz ) to B ( 4 9 4 Hz ) , but panflutes are, as you know, closed at one end. How long does the longest pipe in the flute have to be ? Draw a diagram of the position

What is the effective range of a cellular base station? answer Up to 1 0 miles ( 1 6 km ) Up to 1 mile ( 1 . 6 km ) Up to 5 miles ( 8 km ) Up to 2 miles ( 3 . 2 km )

A proton travels with a speed of 5 . 0 5 1 0 6 m s at an angle of 5 6 with the direction of a magnetic field of magnitude 0 . 1 6 0 T in the positive x - direction. ( a ) What is the magnitude of the magnetic force on the proton? N ( b ) What is the proton's acceleration? ( Give the magnitude. ) m s 2
A proton travels with a speed of 5 . 0 5 1 0 6 m

What is period ( Tmoon ) of a jeffersonian pendulum on surface of the moon? hint assume Gmoon = ( 1 / 6 ) Gearth

A light rod extends from x = 0 to x = L ( with y = 0 ) . There is a point mass of value m at x = 0 , and a point mass of value 2 m at x = L . a ) What is the moment of inertia I about an axis parattel to the y axis, and through x = 0 ? b ) What is the moment of inertia / about an axis parallel to the y axis, and through x = L ? c ) What is the
A light rod extends from x = 0 to x = L ( with y

a ) Write an equation for the spin angular momentum of the Earth assuming a polar moment of inertia C = 0 . 3 3 M E R 2 , and orbital angula velocity E . ( 2 ) b ) Write an equation for the orbital angular momentum of the Moon, assuming a circular orbit of radius r , lunar mass M M , and orbital angular velocity M . ( 2 ) c ) How much slower does
a ) Write an equation for the spin angular

Question 1 A stretched wire, changes its length or its diameter, depending on the direction. True FalseQuestion 1 A stretched wire, changes its length or its diameter, depending on the direction. True False
Question 1 A stretched wire, changes its length

A 0 . 6 6 3 0 kg ice cube at - 1 2 . 4 0 C is placed inside a rigid, thermally isolated chamber containing 6 . 1 9 0 moles of steam at 3 6 5 . 0 C . Later, you notice that the ice cube has completely melted into a puddle of water. The specific heats of ice, water, and steam are c i c e = 2 0 9 3 J k g * C , c w a t e r = 4 1 8 6 J k g * C , and c
A 0 . 6 6 3 0 kg ice cube at - 1 2 . 4 0 C is

Question 1 3 pts What is the net torque acting on this bar about the point C ? 1 0 Nm CCW 2 5 Nm CW 5 0 Nm CCW 1 3 NmCCW
Question 1 3 pts What is the net torque acting on

Question 2 : A soap bubble has a thickness of 2 3 9 nm and an index of refraction of 1 . 3 3 . Suppose white light is shone directly onto a part of the bubble, perpendicular to its surface. Consider the first and second order constructive interference for this situation to find the prominent wavelengths of light that would come out from this
Question 2 : A soap bubble has a thickness of 2 3

How many lines of magnetic flux must be cut in 1 s to induce a voltage of 1 V ? 1 , 0 0 0 , 0 0 0 or 1 Gauss 1 0 , 0 0 0 , 0 0 0 or 1 Tesla 1 0 0 , 0 0 0 , 0 0 0 or 1 Weber 1 0 0 , 0 0 0 or one Einstein
How many lines of magnetic flux must be cut in 1

wht is momentum

( 5 points ) Three current - carrying conductors are arranged in the same plane as shown in the figure. A circular loop with radius R = 1 0 c m carries current I l = 4 A . The centre of the loop is a distance D 1 = 2 R and D 2 = 3 R above the two - very long - straight wires which are carrying equal, but opposite currents I 2 = I 3 = 1 0 A .
( 5 points ) Three current - carrying conductors

The q , of the sound wave, the greater the intensity . shorter the wave length longer the wave length higher the frequency lower the frequency lower the amplitude not here greater the amplitude
The q , of the sound wave, the greater the

A sled weighing 5 8 . 0 N is pulled horizontally across snow so that the coefficient of kinetic friction between sled and snow is 0 . 1 0 0 . A penguin weighing 7 3 . 5 N rides on the sled, as in the figure below. If the coefficient of static friction between penguin and sled is 0 . 7 0 0 , find the maximum horizontal force that can be exerted on
A sled weighing 5 8 . 0 N is pulled horizontally

Show full process for all calculations. Show the direction of the magnetic fields with X ' s ( into the page ) or - ' s ( out of the page ) Calculate the net magnetic field at points 1 , 2 and 3 e 1 net magnetic field at point 1 Buel = 4 net magnetic field at point 2 net magnetic field at point 3
Show full process for all calculations. Show the

An L - R - C series circuit has RR = 6 0 . 0 , LL = 0 . 8 0 0 HH , and CC = 2 . 0 0 1 0 4 FF . The ac source has voltage amplitude 7 0 . 0 VV and angular frequency 1 1 0 rad / srad / s .

2 . 0 1 0 - 8 m , how precisely can its speed be known ? Expr

What parameter does the aperture size change in this experiment? Does it affect stopping potential? Why or why not?

A lunar lander is free falling toward the moon and at an altitude of 5 3 km above the lunar surface its downward velocity is measured at 1 4 7 7 km / h

9 ) What does the energy of the wave pulse depend on ?

When a certain liquid freezes, it expands about 1 0 . 5 % . What would be the pressure increase inside an engine block if the liquid in it froze? ( The bulk modulus of the liquid when it solidifies is 2 . 1 5 1 0 9 N / m 2 . )

The cosmic microwave background ( CMB ) radiation has a temperature of 2 . 7 3 K . ( a ) What is the photon energy density in the Universe? ( b ) Estimate the number of CMB photons that fall on the outstretched palm of your hand every second.

LearningAn empty cylindrical barrel is open at one end and rolls without slipping straight down a hill. The barrel has a mass of 1 7 . 0 kg , a radius of 0 . 5 3 3 m , and a length of 0 . 8 0 0 m . The mass of the end of the barrel equals a third of the mass of its side, and the thickness of the barrel is negligible.The acceleration due to gravity

1 Two charged particles, Q 1 and Q 2 , are a distance r apart with Q 2 = 4 Q 1 . Compare the forces they exert on one another when F 1 is the force Q 2 exerts on Q 1 and F 2 is the force Q 1 exerts on Q 2 .
1 Two charged particles, Q 1 and Q 2 , are a

In a given period of time t , what is the probability P ( t ) that the nucleus has decayed ( i . e . , the probability that the alpha particle has actually tunneled out ) ? Express your answer in terms of t , , and p .
In a given period of time t , what is the

A 1 . 9 9 - kg particle has a velocity ( 2 . 0 1 3 . 0 3 ) m / s , and a 2 . 9 6 - kg particle has a velocity ( 0 . 9 7 + 5 . 9 4 ) m / s . ( a ) Find the velocity of the center of mass. + m / s ( b ) Find the total momentum of the system. + kg m / s

Compare Newton s law of acceleration to Newton s law of Inertia with a sport example.

what is the ratio pc / mc ^ 2 for a particle with mass m so that the total energy of the particle is 4 . 1 9 times its rest energy

An object is moving along a straight line, and the uncertainty in its position is 3 . 5 0 m . Fin dthe minimum uncertainty in the object's velocity, assuming that the object is a golf ball, and an electron?

Explain how an endoscope allows us to see inside the human body.
Explain how an endoscope allows us to see inside

A 0 . 5 kg mass is dropped vertically from rest onto a linear spring 1 m below it . If the spring constant is 3 0 0 N / m , find a ) the spring compression as the mass comes to a complete stop. b ) the velocity of the mass on hitting the spring.

an average sized nucleus has a diameter of about 1 0 fm . in comparison the range of nuclear force is ?

The smaller and larger pistons of a hydraulic press have radius of 1 mm and 8 mm . What input force is required to lift a 1 0 0 0 N weight with the output piston?

A small ball with a mass of 0 . 0 7 kg moves along a circular orbit with a radius of 0 . 3 m at a speed of 4 . 0 m / s . What is the angular momentum of the ball? kg - m 2 / s ( b ) If the angular momentum of this ball were quantized in the same manner as the angular momentum of electrons in the Bohr model of the atom, what would be the value of

What is the difference between an E 0 and an E 7 galaxy? Group of answer choices The E 7 has an oval shape and the E 0 is circular. The E 7 has a larger disk than the E 0 . The E 7 has a smaller disk than the E 0 . The E 7 has a circular shape and E 0 is oval. There is no such thing as an E 0 galaxy.

Use vectors to show how motion in a gravitational field can be broken into x and y components. What is the advantage of this approach?

a radioactive nuclide has a halflife of 3 1 y . what fraction of an initially pure sample

Part ( d ) Imagine that the N springs from part ( c ) are released from rest simultaneously. If the potential energy stored in the springs is fully converted to kinetic energy and thereby released when the attached masses pass through equilibrium, what would be the average rate at which the energy is released? That is , what would be the average

A 0 . 1 8 0 - A current is charging a capacitor that has circular plates 9 . 9 cm in radius. The plate separation is 4 . 0 0 mm . ( a ) What is the time rate of increase of electric field between the plates? V / ( m s ) ( b ) What is the magnetic field between the plates 5 . 0 0 cm from the center?

Berkeley uses about 2 million kWh of electricity per day, which can come from a variety of sources. We will compare fossil fuels and solar power as two such sources of energy. ( a ) You first consider building a coal - fired power plant, which has an efficiency of about 5 0 % for converting chemical potential energy in the coal to electrical

What is the acceleration of a car traveling with a constant velocity when its engine produces a constant force of 2 0 , 0 0 0 N ? Select one: a . 0 m / s 2 b . 2 0 m / s 2 c . There is not enough information to determine acceleration d . 9 . 8 m / s 2

The term used to refer to a reduction of sound is:
The term used to refer to a reduction of sound is:

Air enclosed in a sphere has density 1 . 5 k g m 3 What will the density be if the radius of the sphere is halved, compressing the air within? Express your answer in kilograms per cubic meter.
Air enclosed in a sphere has density 1 . 5 k g m

How much energy is stored in a 2 . 6 0 - cm - diameter, 1 2 . 0 - cm - long solenoid that has 2 0 0 turns of wire and carries a current of 0 . 7 9 0 AA ? Express your answer with the appropriate units. Activate to select the appropriates template from the following choices. Operate up and down arrow for selection and press enter to choose the

The geoengineering strategy of launching millions of tiny mirrors into space to reflect sunlight away from Earth would work by affecting Earth s energy balance. Group of answer choices True False

A uniform rod of mass M and length L can rotate about a hinge at its left end and is initially at rest. A putty ball of mass m , moving with speed v , strikes the rod at angle / theta from the normal and sticks to the rod after collision. ( a ) What is the total moment of inertia, I, with respect to the hinge, of the rod - ball system after the

The following two problems concern the same physical situation: A spool of mass M = 1 k g sits on its side on a frictionless horizontal surface. A thread wound around the spool is pulled with a force T = 4 N as shown below. The total moment of inertia about the center of mass of the spool is I = 0 . 8 k g * m 2 , its outer radius is R = 1 m and
The following two problems concern the same

Question 5 How many different quantum states in the three - dimensional hydrogen atom have a principal quantum number \ ( \ mathrm { n } = 4 \ ) and orbital angular momentum quantum number \ ( \ mathrm { I } = 3 \ ) ? 5 1 2 1 4 4 6 3 1 0 7
Question 5 How many different quantum states in

Question 2 An x - polarized electromagnetic wave propagating in vacuum is described by the following equation: vec ( E ) = hat ( x ) E 0 e i ( t - 3 0 0 y + 4 0 0 z ) where all quantities are in SI units. Calculate the wavelength and the frequency of the wave. Calculate the angle that vec ( k ) makes with the y - axis. Show that the wave is
Question 2 An x - polarized electromagnetic wave

The orbit of earth's moon has a period of 2 7 days and a radius ( semi - major axis ) of . 0 0 2 5 6 A . U . ( = 3 . 8 4 X 1 0 ^ 5 km ) . what is the mass of earth?

The inductor in ( Figure 1 ) is a \ ( 9 . 0 - \ mathrm { cm } \ ) - long, 2 . 0 - cm - diameter solenoid wrapped with 4 0 0 turns. Part A What is the current in the circuit \ ( 5 \ mu \ mathrm { ~s } \ ) after the switch is moved from a to b ? Express your answer with the appropriate units. \ [ I = \ square \ ] Request Answer Provide Feedback
The inductor in ( Figure 1 ) is a \ ( 9 . 0 - \

Piston ( 1 ) in the figure below has a diameter of 0 . 3 2 in . ; piston ( 2 ) has a diameter of 1 . 8 in . In the absence of friction, determine the force \ ( \ overrightarrow { \ mathbf { F } } \ ) necessary to support the 5 0 0 - Ib weight. ( Enter magnitude. ) Your response differs from the correct answer by more than \ ( 1 0 0 \ % \ ) . lb
Piston ( 1 ) in the figure below has a diameter

The frequency of light omitted from hydrogen present in the Andromeda galaxy has been found to be . 1 % higher than from hydrogen measured on earth. Is this galaxy approaching or receding from earth

A cosmic ray proton ( m p = 1 . 6 7 1 0 - 2 7 k g ) strikes the Earth near the equator with a vertical velocity of 2 . 8 1 0 7 m s . Assume that the horizontal component of the Earth's magnetic field at the equator is 3 0 T . Calculate the ratio of the magnetic force on the proton to the gravitational force on it .
A cosmic ray proton ( m p = 1 . 6 7 1 0 - 2 7 k g

Question 2 8 1 pts A cylinder with a movable piston contains a fixed quantity of gas. The volume of the gas is 0 . 2 5 m 3 and the pressure is 1 atm . If the temperature of the gas is held constant and the piston is pushed in to reduce the volume to 0 . 2 m 3 , what is the new pressure in kPa ? 0 . 8 1 2 6 6 3 0 1 . 2 5 8 1 1 2 7
Question 2 8 1 pts A cylinder with a movable

Consider this situation: A golf ball travels upward and rightward through the air. Of the forces listed, identify which act upon the golf ball. Tap to select the forces that are present.
Consider this situation: A golf ball travels

An object is in simple harmonic motion with frequency w 0 , with y ( 0 ) = y 0 and y ' ( 0 ) = v 0 . Find its displacement for t > 0 Find the amplitude of the oscillation

Two people push from opposite sides on adjacent blocks that are placed on a rough floor: a 4 kg block on the left and an 8 kg block on the right. Throughout this scenario the blocks stay in contact but are not glued together. Person 1 pushes down and to the right on the 4 kg block with force F 1 = 1 2 N at an angle = 3 0 above the horizontal.
Two people push from opposite sides on adjacent

The second law of thermodynamics leads us to conclude that: a ) the average temperature of the universe is increasing with the passage of time.
The second law of thermodynamics leads us to

Suppose a walrus transfers energy by conduction through its blubber at the rate of 1 7 5 W when immersed in - 1 . 1 5 C water. The walrus s internal core temperature is 3 7 . 0 C , and it has a surface area of 1 . 9 m 2

if a guitar string has a fundamental frequency of 5 0 0

3 . A roller coaster starts from rest at a height of 3 0 m above the ground. It descends a steep track and rises again to a height of 1 0 m . Assuming no energy is lost due to friction, find the speed of the roller coaster at the lowest point. Calculate its speed when it rises back to the 1 0 m height. ( Use g = 9 . 8 m / s 2 ) .

A freezer has a coefficient of performance of 6 . 3 0 . The freezer is advertised as using 4 8 1 kW - h / y . Note: One kilowatt - hour ( kW - h ) is an amount of energy equal to operating a 1 - kW appliance for one hour. ( a ) On average, how much energy does the freezer use in a single day? ( b ) On average, how much thermal energy is removed

A radio wave strikes the surface of a copper conductor normal to it . What is the lowest possible frequency of the radio wave, if the total magnetic field is zero at a distance 1 m away from the conductor surface?

An electron is in the hydrogen atom with nn = 5 . Part A Find the possible magnitudes of LL for this electron, in units of .

What is the precent activity in mCi

A rocket cruises past a laboratory at 1 . 0 5 1 0 6 m / s 1 . 0 5 1 0 6 m / s in the positive xx - direction just as a proton is launched with velocity ( in the laboratory frame ) v = ( 1 . 4 8 1 0 6 i ^ + 1 . 4 8 1 0 6 j ^ ) m / sv = ( 1 . 4 8 1 0 6 i ^ + 1 . 4 8 1 0 6 j ^ ) m / s . Part A What is the proton's speed in the laboratory frame? What

using Bragg's law determine if diffraction will occur

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