# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**physics**

A monoatomic ideal gas has Cp= 5R/2 a) four moles of the gas undergoes a process in which the temperature of the gas increases from 300 K to 500 K while the pressure is kept constant at 2.00 x 105 Pa. What is the change in the internal energy of the gas? b) Four moles of the ...

**physics**

a wire of lengh 2meter has a resistance of 4 ohms,obtain the resistance if specific resistance is doubled,diameter is doubled,and the lengh is made three times of the first.plsss help me!

**physics**

a wire of lengh 2meter has a resistance of 4 ohms,obrain the resistance if specific resistance is doubled,diameter is doubled and the length is made three times of the first.

**physics**

Coherent light of frequency 6.30 1014 Hz passes through two thin slits and falls on a screen 75.0 cm away. You observe that the third bright fringe occurs at ±3.06 cm on either side of the central bright fringe. (a) How far apart are the two slits? I got --> .035 mm (b) At...

**Physics**

Find the angle of elevation of a gun that fires a shell with muzzle velocity of 125m/s and hits a target on the same level but 1.55km distance

**physics**

A wheel of radius 4 m is spinning with an angular velocity of 2 rad/s. What is the translational velocity of a point on the wheel's rim?

**Physics**

How many x-ray photons are emitted per second by an x-ray tube that puts out 1.0 W of 75-KeV x rays?

**Physics**

Two trains are running on parallel tracks., train A is faster than B.There is a box on each train of identical nature. But mass of box in train A is more than that of train B. If box is changed between the trains, what happens to speed of trains? A.Same B. A faster C. B faster...

**Physics**

an electric cattle is rated 5 kilowatt. how much time will it take to boil 15 kg of water initially at 15 degree celsius if it is connected to 230 volt supply.

**Physics**

A bar of gold and a bar of silver are used to conduct heat from one end maintained at 80.0oC and another end maintained at 30.0oC. If both bars have the same length L = 1.00m and the same cross sectional area A=100cm2 and are insulated from the outside, once steady state has ...

**Physics**

You cool a 100g slug of red hot iron (745oC) by dropping it into an insulated cup of negligible mass containing 75.0g of water, at 20oC. Assuming no heat exchange with the surroundings (a) what is the final temperature of the iron? (b) what is the final mass of the iron and ...

**Physics**

A glass flask with a mass ok 3.00kg and volume of 1000 cm3 is completely filled with mercury and is at a temperature of 55.0oC. The flask is then lowered into an ice water bath. After thermal equilibrium is reached, (a) what percentage of the flask will be filled with mercury...

**Physics**

Standard Temperature and Pressure (STP) is defined as a temperature of 0.00oC and a pressure of 100kPa. If the molar mass M of nitrogen is 14.0 g/mol, find the density (kg/m3) of nitrogen gas (N2) at STP. Nitrous Oxide or laughing gas is composed of the molecule N2O. If the ...

**Physics**

A horizontal pipe is shown and has an area of 40.0 cm2 in wide areas and 10.0 cm2 in narrow areas. It is also connected to a U shaped tube filled with mercury. water is flowing through the pipe at a rate of 5.00 L/s. Find (a) the flow speeds at the wide and narrow portions (b...

**Physics**

1. A cylindrical disk of wood weighing 45.0N and having a diameter of 30.0 cm floats on a cylinder of oil of density 0.850 g/cm3. The cylinder of oil is 75.0 cm deep and has the same diameter of the wood. (a) What is the gauge pressure at the top of the oil column? Suppose now...

**physics**

The length of a spring when a mass of 20g is hung from its end is 14cm,while its total length is 16cm when a mass of 30g is hung from the same end.calculate the unstretched spring assuming Hooke's law is obeyed.

**physics**

a vector of magnitude 5 units makes an angle 120 degree with +ve x-axis in anticlockwise direction given vector is

**Physics**

A uniform rod of mass 444 g and length 1.41 m is pivoted about one end and oscillates in a vertical plane. Find the period of oscillations if the amplitude of the motion is small. The acceleration of gravity is 9.8 m/s^2. Answer in units of s.

**physics**

The figure shows a stationary arrangement of two crayon boxes and three cords. Box A has a mass of 12.6 kg and is on a ramp at angle θ = 28.9o; box B has a mass of 6.06 kg and hangs on a cord. The cord connected to box A is parallel to the ramp, which is frictionless. (a) ...

**physics**

A crest on a transverse wave is to a compression in a longitudinal wave as a trough is to: A. a resonance B. a beat C. interference D. a rarefaction E. an antinode

**physics**

When an object is moving in a simple harmonic motion, which of the following is at a minimum when the displacement from equilibrium is zero? A. the magnitude of the velocity B. the magnitude of the acceleration C. the kinetic energy D. the total mechanical energy E. More than ...

**physics**

A mass on a spring A oscillates at twice the frequency of the same mass on spring B. Which statement is correct? A. The spring constant for B is one quarter of the spring constant for A. B. The spring constant for B is 4 times the spring constant for A. C. The spring constant ...

**PHYSICS**

A 0.500 kg wheel that has a moment of inertia of 0.015 kg m^2 is initially turning at 30 rev/s. it starts to rest after 163 revolution. how large is the torque that slowed it?

**Physics**

Which of the following wavelengths will produce standing waves on a string that is 1.9 m long? A.1.9 B.3.3 C.3.5 D.95

**Physics**

If a stone is thrown with velocity 10 m/s. How high will it reach after 10 s. Take g = 10 m/s^2 I want to know if this question is practically possible. I tried to solve this problem and ended up getting the answer in negative. Please help me!!! Afterall time of fall is ...

**Physics**

The Achilles tendon is attached to the rear of the foot as shown in Tap image to zoom . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 61 kg and D is twice as long as d. Part A Find the tension FT in the Achilles ...

**physics**

a block of mass 0.1kg is attached to spring and placed on a horizontal frictionless table .the spring is stretched 20cm when a force of 5n is applied.calculate the spring constant

**physics 10**

Write 95.43×10^-4 in scientific notation. Since we need to have the decimal place so that there is only one number on the left I guess I do this: 9.543 And to get back to where I was I need to go -1 So would this be the right answer: 9.543×10^1 I'm confused may you please ...

**physics**

Consider a string with a length of 56.5 cm tied at both end (like on a stringed instrument). If the frequency of the first harmonic on the string is 272 Hz, determine the speed of the wave in the string. Post your answer in m/sand with 3 significant figures.

**Physics**

A body of mass m moving vertically with speed 3 m/s hits a smooth fixed inclined plane and rebounds with a velociw vf in the horizontal direction. If angle of inclined plane is 30°, the velocity of will be

**Physics**

How many x-ray photons are emitted per second by an x-ray tube that puts out 1.0 W of 75-KeV x rays?

**Physics**

Question: You have a 4.5 kg lead block at room temperature. Part A: Find the energy required to raise the lead’s temperature to its melting point. Part B: Find the energy required to melt the lead once it’s reached the melting point. I got the answer to part A. It is 1.8×...

**Physics**

How many x-ray photons are emitted per second by an x-ray tube that puts out 1.0 W of 75-KeV x rays?

**Physics**

A certain material has a work function 0 (angle sign) = 1.5 eV. a)what is the frequency of a photon that ejects an electron from his material, giving the electron an energy of 1.6 eV? b)what type of EM radiation is this?

**physics**

Two cars are travelling at adjacent highway lanes in the same direction . Car B is stopped by car A which travels at 15km/hr. Then 2 seconds later car B starts and accelerate at a constant rate of 3 meter per seconds square . Determine when and where car B will overtake car A ...

**physics**

To anticipate a dip and a bump in the road the driver of a car applies her break to produce ga uniform deceleration . Her speed is 100km/hr at the bottom A of the dip and 50km/hr at the top C of the hump which is 120m along the road from A . If the passengers experiences a ...

**Physics (Waves)**

Determine the intensity of light passing through a polarizer-analyzer combination with an angle of 45° between them.

**Physics (Waves)**

Determine the angle between a polarizer-analyzer combination that allows 33% of the incident light to pass through.

**physics (please help I have a test tmrw)**

How much thermal energy is released when 500g of steam at 100 degrees C condenses into liquid water and then cools to 50 degrees C? I tried to solve q=mct for q and then use that in the q=mLv formula but it didn't work. The answer is 1.3x10^6J Help would be appreciated! Thank ...

**Physics**

At a nuclear power plant, water at 6degress Celius from a nearby lake is used in a heat exchange to condense spent steam at a temperature of 115 degees C to water at 80 degrees C. If the cooling water returns to the lake at a temperature of 18 degrees C, what mass of lake ...

**Physics pls help**

A ball with massm1=4.0 kgam is traveling to the right with the velocityv1=6.0m/s another ball with mass m2=2.0kh is traveling to the left with velocity -4.0m/s find the final velocity of the ball after the collision Find the loss in Kenetic energy Find the impulses imported to...

**physics**

A glass window with a mass of 20kg is heated to a temperature of 32C by the sun. How much thermal energy is released by the window to the surroundings as it cools to 5C at night? The answer is 4.5x10^5 J but I don't know how to get there. Thank you!

**Physics**

Two cars traveling in the same direction at the same speed one behind the other. Will the second car catch up?

**physics**

How much heat is required to convert 3kg of ice at -5 degees C into steam at 125 degrees C?

**physics**

Consider a string with a length of 56 cm tied at both end (like on a stringed instrument). If the frequency of the first harmonic on the string is 272 Hz, determine the speed of the wave in the string. Post your answer in m/sand with 3 significant figures.

**physics**

In an experiment to estimate the diameter of an oil molecule,an oil drop of diameter 0.05cm spreads over a circular patch whose diameter is 20cm. ¡)determine the volume of the oil drop.

**Physics**

3. A calorimeter has a mass of 100g and a specific heat of 0.900 cal/g˚C and contains 400g of water at 40˚C. When 91g of ice at 0.0˚C is added and completely melted, the temperature of the water is 18.2˚C. Calculate the heat fusion of the ice

**Physics**

6. Two charges, Q1 = 4.6x10-9 C and Q2 = 4.3 x10-9 C, are 60mm apart. What is the electric field halfway between them?

**Physics**

5. Three charges, Q1 = 10µC, Q2 = 8µC and Q3 = 7µC are lying along a straight line. Q1 is one meter away from Q2 and Q2 is one meter away from Q3. Find the net electric force on Q1

**Physics**

4. Find the magnitude of the force between two charges Q1 = 3µC, Q2 = 2.5µC that are 50mm apart.

**Physics**

The kinetic energy of a particle is equal to the energy of a photon. The particle moves at 6.9% of the speed of light. Find the ratio of the photon wavelength to the de Broglie wavelength of the particle. Take the speed to be non-relativistic.

**ap physics**

Two 25.0 g spheres are hanging from lightweight strings that are each 35.0 cm in length. Each has the same charge. They repel each other and make an angle of 5.00 to the vertical. What is the magnitude of the charge on each sphere?

**AP physics**

What is the resistance of a copper wire, diameter of 1.50mm and length of 25.0 m? i got R=pl/A R=p(25m)/(3.14*(.00075^2)) how ever i found the answers online and they give me this (1.68*10^-8)(25.0)/(3.14*(.00075^2))

**physics**

Consider a pipe with a length of 57.5 cm. If the temperature of the air is 21.5degrees C and the pipe is closed in one end and open in the other, what is the frequency of the third harmonic for the pipe? Post your answer in hertz (Hz) and with 3 significant figures.

**physics**

A car of mass 1200kg travelling at 72km/h was brought to rest in 4 seconds. 1. what is this period in m/s? 2. find; a. the deceleration of the car. b. the force that caused the car to come to rest. c.the distance it travelled during its deceleration.

**Physics**

A point source is 1.20m below the surface of a body of water. Find the diameter of the circle at the surface through which light emerges from the water.

**Physics**

2 charge of 10 microcoulomb and 40 microcoulomb respectively 12cm apart find the position of a point where electric field is zero

**Physics**

okay for a) I got the answer as 11.67 seconds and did v=d/t and for b) i found that wavelength= 6km. Im confused how the 100 m deep affects the equation for c and d. The 2011 Japan tsunami was triggered by an earthquake 70 km offshore. The earthquake travels through the earth ...

**Physics**

One more please, I cant figure out the equations. Boats generally have a hard time traveling faster than their hull speed, which is thespeed of a water wave that has the same wavelength as the boat length? (a) What is the hull speed for a 5 meter canoe in deep water? (b) What ...

**Physics**

You and your friend are talking on a string telephone that is 14 m long. Each of you pulls on the string with about 9 N of force, meaning that the string tension is 9 N. The string has a mass density of 1.2 g/m. How long does it take for your voice to reach your friend through...

**Physics**

A pipe organ is an aerophone with open ended tubes, with esssentially the same physics as the flute. (a) for normal room temperature, where the speed of sound is about 340 m/s how long is the pipe for the A440 note. (b) Suppose someone wanted to install an outdoor pipe organ ...

**physics**

An air-track cart with mass m=0.20kg and speed v0=1.5m/s approaches two other carts that are at rest and have masses 2m and 3m, as indicated in (Figure 1) . The carts have bumpers that make all the collisions elastic. Find the final speed of cart 1, assuming the air track ...

**physics**

A car with a mass of 980 kg and a speed of v1 = 17.0 m/s approaches an intersection, as shown in the figure(Figure 1) . A 1300 kg minivan traveling at v2 is heading for the same intersection. The car and minivan collide and stick together. The direction of the wreckage after ...

**physics homework**

To make a bounce pass, a player throws a 0.60-kg basketball toward the floor. The ball hits the floor with a speed of 5.2 m/s at an angle of 60 ∘ to the vertical. Part A If the ball rebounds with the same speed and angle, what was the magnitude of the impulse delivered to it...

**physics**

A 55-kg person walks due north with a speed of 1.1 m/s, and her 7.0-kg dog runs directly toward her, moving due south, with a speed of 1.8 m/s.

**physics**

A 0.054-kg pet lab mouse sits on a 0.35-kg air-track cart, as shown in (Figure 1) . The cart is at rest, as is a second cart with a mass of 0.25 kg. The lab mouse now jumps to the second cart. After the jump, the 0.35-kg cart has a speed of v1=0.80m/s. What is the speed v2 of...

**Physics**

A ball falls from the top of a high cliff. A second ball is thrown downward from the same height 4 secs later with an initial speed of 40m/s. If both balls hits the ground simultaneously. How high is the cliff?

**Physics**

How much heat is required to melt 2.4kg of ice at 0 degrees Celsius? So here's what I did: Q=mct = 4200x2.4x(100-0) I assumed the ice was at 100 but I'm pretty sure you're not allowed to do that. Q=mlf 1008000=2.4Lf So I ended up getting the wrong answer, I'd appreciate help!

**physics**

Derive the relation for a travelling wave ,d^2 y/dt^2 = V^2 d^2 y/dx^2

**physics**

Consider a wire in the shape of a semi-circle of radius R, with a total positive net charge Q vistributed over the wire uniformly. Divide the wire into at least 8 equal point-like “chunks” of charge. Then, for each “chunk,” sketch (on the same diagram) the E-field ...

**physics**

If a segment of wire has a net charge (uniformly distributed), and then its length is increased by 50%,by what factor has its charge density changed? If the original charge was 10.0 nC, how much charge must then be added to restore the wire’s original charge density?

**physics**

Consider a pipe with a length of 57.5 cm. If the temperature of the air is 21.5+B degrees C and the pipe is closed in one end and open in the other, what is the frequency of the third harmonic for the pipe? Post your answer in hertz (Hz) and with 3 significant figures.

**physics**

if the relative density of a metal is 19.what will be the mass of 20cm3 of the metal when immersed in water

**physics**

The speed of a wave in a string is given by v = sqrt (FT/m), where FT is the tension in the string and m = mass / length of the string. A 2.00 m long string has a mass of 28.50 g. A 1024 g mass is attached to the string and hung over a pulley (see illustration from one of the ...

**Physics**

Finding of radius of capillary tube without knowing surface tension

**Physics**

A 2.00 Ã¢Å“â€¢ 106 Hz radio signal is sent a distance of 7.30 Ã¢Å“â€¢ 1010 meters from Earth to a spaceship orbiting Mars. Approximately how much time does it take the radio signal to travel from Earth to the spaceship?

**physics**

1.5 kg of an unknown liquid at a temperature of 17 degrees Celsius is added to 2kg of water at 50C. The final temp of the mixture is 45C. Assuming no heat is lost to the environment, determine the specific heat capacity of the unknown liquid. So I assume you would do Qmct = ...

**Physics**

You are sitting on a train that is about to drive into a tunnel that is at the base of a large cliff. Just before entering the tunnel, the train blows its whistle, which has a frequency of 600 Hz. (a) What frequency do you hear from the whistle directly? (b) What frequency ...

**Physics**

A small, circular washer of radius a = 0.750 cm is held directly below a long, straight wire carrying a current of I = 13.0 A. The washer is located h = 0.495 m above the top of a table (see figure below). Assume the magnetic field is nearly constant over the area of the ...

**physics**

Consider a wire in the shape of a semi-circle of radius R, with a total positive net charge Q distributed over the wire uniformly. Divide the wire into at least 8 equal point-like “chunks” of charge. Then, for each “chunk,” sketch (on the same diagram) the E-field ...

**physics**

If a segment of wire has a net charge (uniformly distributed), and then its length is increased by 50%,by what factor has its charge density changed? If the original charge was 10.0 nC, how much charge must then be added to restore the wire’s original charge density?

**physics**

What mass of hot water at 70 degrees C must be added to 2000g of cold water at 5 degrees C to raise it's temperature to 20 degrees C? To be honest I really don't have any idea how to do this question. I would really appreciate help, thank you

**physics**

A 1024 g mass is hung on a spring. As a result the spring stretches 35 cm. If the object is then pulled an additional 3.0 cm downward and released, what is the period of the resulting oscillation? Give your answer in seconds with 3 significant figures. I think im suppose to ...

**physics**

When an object is moving in a simple harmonic motion, which of the following is at a minimum when the displacement from equilibrium is zero? A. the magnitude of the velocity B. the magnitude of the acceleration C. the kinetic energy D. the total mechanical energy E. More than ...

**physics**

The speed of a wave in a string is given by v = sqrt (FT/m), where FT is the tension in the string and m = mass / length of the string. A 2.00 m long string has a mass of 28.50 g. A 1024 g mass is attached to the string and hung over a pulley (see illustration from one of the ...

**physics**

A 1024 g mass is hung on a spring. As a result the spring stretches 35 cm. If the object is then pulled an additional 3.0 cm downward and released, what is the period of the resulting oscillation? Give your answer in seconds with 3 significant figures.

**Physics**

10 mol of an ideal gas expands isothermally at 373 K to 2.6 times its initial volume. Find the heat flow into the system. The universal gas constant is 8.31 J/K · mol. Answer in units of J. Any help much appreciated, I have no idea where to begin with this problem.

**Physics**

A 120kg fridge requires 610N to just move it across the floor, if the coefficient of kinetic friction is 0.2, determine the force required to continue pushing it s constant velocity.

**Physics 1401**

An Atwood's machine is built from m1=1kg and m2=2kg. The mass less string is passed over a friction less, mass less pulley. When the system is released from rest, what is the tension in the string?

**Physics**

A wheel has a constant angular acceleration of 2.5 rad/s2. Starting from rest, it turns through 200 rad. (a) What is its final angular velocity (in rad/s)? (Enter the magnitude.) (b) How much time elapses (in s) while it turns through the 200 radians?

**Physics**

A uniform rod of mass 2.0 kg and length 8.4 m is free to rotate about one end (see the following figure). If the rod is released from rest at an angle of 60° with respect to the horizontal, what is the speed (in m/s) of the tip of the rod as it passes the horizontal position?

**Physics**

A horizontal beam of length 4 m and mass 7.0 kg has a mass of 2.0 kg and width 0.8 m sitting at the end of the beam (see the following figure). What is the torque due to gravity (in N · m) on the beam–block system about the support at the wall? (Enter the magnitude.)

**Physics**

You have a grindstone (a disk) that is 92.0 kg, has a 0.490-m radius, and is turning at 83.0 rpm, and you press a steel axe against it with a radial force of 25.0 N. (a) Assuming the kinetic coefficient of friction between steel and stone is 0.50, calculate the angular ...

**Physics**

A 9 kg block on a frictionless inclined plane at 40° has a cord attached to a pulley of mass 4 kg and radius 11 cm (see the following figure). (a) What is the acceleration of the block down the plane (in m/s2)? (Enter the magnitude.) (b) What is the work done by gravity (in J...

**Physics**

A uniform rod of length L and mass M is held vertically with one end resting on the floor as shown below. When the rod is released, it rotates around its lower end until it hits the floor. Assuming the lower end of the rod does not slip, what is the linear velocity of the ...

**Physics**

2) Two point charges, Q1 = 5.00 nC and Q2 = -3.00 nC, are separated by 35.0 cm. (a) What is the potential energy of the pair? What is the significance of the algebraic sign of your answer? (b) What is the electric potential at a point midway between the charges?

**Physics**

Suppose that you place a square block of wood with dimensions 12.0 cm x 12.0 cm x 6.0 cm into some water as shown below. The wood has a density of 600 kg/m3. What is the distance from the bottom horizontal face of the block to the surface of the water? (In other words, how ...

**Physics**

Water flows into one end of a horizontal, cylindrical pipe at 2.0 m/s. The pipe then narrows until its diameter at the opposite end is only 1/3 of that at the beginning. (a) What is the flow speed at the narrow end of the pipe? (b) What is the pressure difference between the ...

**Physics**

An alpha particle (4He) undergoes an elastic collision with a stationary protactinium nucleus (231Pa). What percent of the kinetic energy of the alpha particle is transferred to the protactinium nucleus? Assume the collision is one-dimensional.

**Physics**

In an elastic collision, a 300 kg bumper car collides directly from behind with a second, identical bumper car that is traveling in the same direction. The initial speed of the leading bumper car is 4.90 m/s and that of the trailing car is 6.20 m/s. Assuming that the mass of ...