# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**Physics**

When table salt is put in a candle ﬂame, it burns bright yellow because of emission from the sodium atoms. This emission is at 590 nm. (a) What is the natural resonant frequency of the sodium atom that produces this emission (i.e. what is the frequency of this light)? (b...

**Physics**

How fast would you need to be travelling relative to an observer in order for them to see a 15% increase in your mass?

**Physics**

An observer on Earth sees you travel 1000 m at half the speed of light. What distance do you think that you travelled?

**Physics**

If a proton in a proton beam experiences a downward force of 2.0X10-14N while traveling in a magnetic field of 8.3X10-2T west, what is the velocity?

**Physics**

An arrow 2.5cm high is placed at a distance of 25cm from a diverging mirror of focal length 20cm. Find the nature,position and size of the image formed.

**Physics**

The focal length of a concave mirror that produces four times larger real image of an object held at 5cm from the mirror is.....

**Physics**

When table salt is put in a candle ﬂame, it burns bright yellow because of emission from the sodium atoms. This emission is at 590 nm. (a) What is the natural resonant frequency of the sodium atom that produces this emission (i.e. what is the frequency of this light)? (b...

**Physics**

The Voyager 1 spacecraft is at the edge of the solar system, about 11 billion km away. (a) How long does a radio signal from Voyager 1 take to get to the Earth? (b) Its radio works at 8 GHz. What is the wavelength? (c) What type of light is this? (d) What is the energy of...

**physics**

A source delivers an AC voltage of the form Δv = (89.0 V) sin (70πt), where Δv is in volts and t is in seconds, to a capacitor. The maximum current in the circuit is 0.460 A. Find the following. (a) Find the rms voltage of the source. (b) Find the frequency of the source. (...

**physics**

breaks are applied to a car moving with a velocity of 30 km/s . The breaks produce a retardation of 6 m/s^2 . How long will the car take before coming to a stop.

**Physics**

A gas initially occupies 4.5L at 350k and 22kPa. How many moles and molecules are present?

**physics**

A cat walks along a plank with mass M= 7.00 kg. The plank is supported by two sawhorses. The center of mass of the plank is a distance d1= 0.850 m to the left of sawhorse B. When the cat is a distance d2= 1.11 m to the right of sawhorse B, the plank just begins to tip. If the...

**Physics**

Describe the structure of an atom, the quantised shell model and how it produces absorption and emission spectra.

**Physics**

A 95 kg halfback makes a turn on the football field. The halfback sweeps out a path that is a portion of a circle with a radius og 12 meters. The halfback makes a quarter of a turn around the circle in 2.1 seconds. Determine the speed, acceleration and net force acting upon ...

**pls help physics problem**

A 0.230-kg wooden rod is 1.55 m long and pivots at one end. It is held horizontally and then released. 1) What is the angular acceleration of the rod after it is released? three sf with units 2) What is the linear acceleration of a spot on the rod that is 1.02 m from the axis ...

**physics**

When the play button is pressed, a CD accelerates uniformly from rest to 420 rev/min in 5.0 revolutions. Part A If the CD has a radius of 6.5 cm and a mass of 20 g , what is the torque exerted on it? Express your answer using two significant figures. N.m

**physics help**

Example 11-9 depicts the following scenario. A cat walks along a plank with mass M= 7.00 kg. The plank is supported by two sawhorses. The center of mass of the plank is a distance d1= 0.850 m to the left of sawhorse B. When the cat is a distance d2= 1.11 m to the right of ...

**Physics**

A 34.0 kg block accelerates along a frictionless ramp that is inclined at 35 degrees. Determine the acceleration of the block.

**Physics**

A 12.0 kg object is on a surface that is inclined 30 degrees and the coefficient of friction is 0.65. Determine the force of static friction if the block remains stationary.

**Physics**

A plane with a mass of 4.50 x 10^3 kg accelerates on takeoff at 10.0 m/s2. What is the net force acting on the plane?

**Physics**

Two basketball players collide. Player 1, with a mass of 55.0 kg, experience a -15.6 m/s2 acceleration. If player 2 has a mass of 48.5 kg, what acceleration did he experience immediately following the collision?

**Physics special relativity**

The distance from earth to the galactic centre is 23000 ly. What constant speed would be required to make the journey in 30 y of an astronaut's lifetime? I know the answer should be 0.99999915c but don't know how to get there with time dilation or length contraction

**physics**

Someone is blowing over the top of a water bottle creating a noise. If the bottle is 0.3m tall and has 0.1m of water in it, find the following (assume the speed of sound is 340m/s)

**Physics**

An Australian emu is running due north in a straight line at a speed of 13.0 m/s and slows down to a speed of 10.9 m/s in 2.20 s. Assuming that the acceleration of the bird remains the same, how far the bird will travel before it comes to a full stop?

**physics**

A tube that is open on both ends is 4 meters long. Assuming that the speed of sound is 340m/s, find the following: a) What is the wavelength of the fundamental standing wave (the first harmonic) b) What is the frequency of the fundamental wave? c) What is the frequency of the ...

**PHYSICS**

1.How does a flip work? pretend your on a trampoline and jump vertically. How can you jump up in the air and flip.Where is the force coming from to give you a torque? 2.Do you add up linear momentum and rotational momentum for a net momentum? Like energy?

**physics**

1. A bullet has mass 5g. It is fired with a velocity of 50 ms-1 (g=9.8 ms-2) and strikes on a pendulum of mass 5 kg. Find out the height at which the pendulum is raised.

**Physics**

A particle with a charge of -4.5 x 10-5 C, a mass of 2.5 x 10-7 kg, and a velocity of 7.0 x 10-5 m/s [E] is traveling perpendicularly through an external magnetic field such that the force of gravity is balanced by the magnetic force. Determine the direction and magnitude of ...

**Physics**

A charge with a value of 3.0 x 10-5 C is located 2.5 cm from a charge with a value of 6.5 x 10-5 C. Determine the distance from the larger charge to the point where the total electric field is zero.

**Physics**

A 1000 kg rocket without an internal propulsion system is launched with an initial speed of 7.00 x 102 m/s. Determine the maximum height attained by the rocket.

**physics**

A tube that is open on both ends is 4 meters long. Assuming that the speed of sound is 340m/s, find the following: a) What is the wavelength of the fundamental standing wave (the first harmonic) b) What is the frequency of the fundamental wave? c) What is the frequency of the ...

**physics**

A string is vibrated with a wave that has a wavelength of 6 meters. How long is 1 loop of the standing wave?

**physics**

A ship is anchored in a bay. The echo of the ship's foghorn, reflected from an iceberg, is heard 5.0 seconds after the horn is sounded. The temperature of the air is -10.0 degrees Celsius. How many meters away is the iceberg? Show your work.

**physics**

What frequency would a listener hear if a train moves away from the listener at 180 km/hr? The frequency of the horn is 3500 Hz, and the air temperature is 19.0 degrees Celsius. Show work, and include 3 significant figures.

**physics**

You push back and forth on a 5 m high flagpole and make it sway back and forth. When you push it with a frequency of 2 Hz you get it into its fundamental standing wave. a) How fast do the waves travel through the flagpole? b) What frequency would you have to apply to get it ...

**physics**

I need a answer about these? Calculate the net electric force exerted on a particle of charge -4.0mc due to the influence of charge +5.0mc and -3.0mc at distance of 20cm & 80cm, 50cm from it?

**physics**

A constant force acts on a body mass 0.9 kg at rest for 10s.If the body moves a distance of 250m ,the magnitude of the force is

**hello reiny damon steve can you help me physics**

Find the Gravitational potential at a point on the earth's surface. Take mass of earth as 5.98*10^24kg, it's radius as 6.38*10^6m and G=6.67*10^-11Nm^2kg^-2. Plz i need sir damon and steve including reiny to show me step and solution plz

**Physics**

I'm trying to find the relationship between electric field strength and distance from point charge as an equation. I found the equation cd = E/(c*c). c is the factor by which the distance changes and E is the field strength. Is the equation good enough?

**physics**

Suppose a tank contains 714 m3 of neon (Ne) at an absolute pressure of 1.01×10^5 Pa. The temperature is changed from 293.2 to 294.7 K. What is the increase in the internal energy of the neon?

**physics**

a stone is thrown vertically upward with an intial velovity of 12m/s, after some time it returns to the same position a)what is the displacement of the stone b)the highest point it reached if it took 2 seconds for the stone to reach this point c)the kinetic energy of the stone...

**physics**

the rate at which radiant energy from the sun reaches the earth's upper atmosphere is about 1.50kW/m2. the distance from the earth to the sun is 1.50*10^11m, and the radius of the sun is 6.96 * 10^8m. if the sun radiates as an ideal black body (e=1), what is the temperature of...

**Physics**

The spring of force constant k = 400 N/m is set up horizontally with a 0.300 kg mass attached on it resting on a frictionless table. The mass is pulled so that the spring is stretched 0.100 m from the equilibrium point, and is then released from rest. Determine the speed of ...

**Physics**

A piece of copper wire if it is initially 2.11cm long and it changes to 20.12 cm long. What is the change in temperature if the coefficient of linear expansion is 16.66x10^-6 oC

**physics**

a skydiver has amass of 140 kg.at what speed will she have a momentum of 10,000 kg m/s?

**physics**

a cylindrical vessel of length 1 m and area 1mmsq is filled with water and rotated with an angular speed of w= 20pi find the rise in temp

**Physics**

Two point charges of equal magnitude are seperated by a distance of 12cm in air.An attractive force of 90N acts on each charge.What are the charges

**physics**

The rms output in a circuit is 7.75 A. What is the maximum current?

**Physics**

How much heat is needed to transform a 2.5kg block of ice at -4C to a puddle of water at 12C. c water = 4200 J kg C c ice = 2100 J kg C Lf = 3.33x10^5 J kg

**Physics**

An electron moves to the left with a velocity of 3.2 x 10^5 m/s and has a magnetic force of 5.6 x 10^-17 N exerted on it. What is the magnitude of the magnitude field? Assume the charge has a value of 1.60 x 10^-19 C.

**science**

2. Compare and contrast deductive reasoning and inductive reasoning. Based on the information given here, answer the following questions about the experiment: • What are the qualities of deductive reasoning? • What are the qualities of inductive reasoning? • Throughout ...

**Physics 20**

Two basketball players collide. Player 1, with a mass of 55.0 kg, experience a -15.6 m/s2 acceleration. If player 2 has a mass of 48.5 kg, what acceleration did he experience immediately following the collision?

**Physics 20**

A plane with a mass of 4.50 x 10^3 kg accelerates on takeoff at 10.0 m/s2. What is the net force acting on the plane?

**Physics 20**

A vehicle is involved in a collision that produces a -1500 n net force. what is the acceleration of the 75.5 kg passenger in the car?

**thermal physics**

a force of 2N stretches an elastic material by 30mm. What additional force will stretch the material by 35mm assuming the elastic limit is not exceeded

**Physics**

Simple Harmonic Motion Problem Amplitude=10cm=0.1m , period=1s, angular frequency= 6.28 rad What is the maximum speed of the mass during this motion?

**science**

2. Compare and contrast deductive reasoning and inductive reasoning. Based on the information given here, answer the following questions about the experiment: • What are the qualities of deductive reasoning? • What are the qualities of inductive reasoning? • Throughout ...

**physics**

the half life of radium is 1600 years of 100 grams of radium existing now 25 grams will remain after how many years

**Physics**

Water from the dead sea flows into a pipe of diameter 18cm at a velocity of 5.0m s at pressure 4.0atm. The pipe reduces to a diameter of 10cm at a point 3.5m above. a)Determine the rate of flow. b)Determine the velocity at the top section. c)Determine the pressure at the top ...

**Physics**

A 0.299 kg bead slides on a curved wire, start-ing from rest at point A as described below: A: a crest (hill) 6.15 m high b: a valley between A and C C: a crest (hill) 1.85 m high The acceleration of gravity is 9.8 m/s2 . 1) If the wire is frictionless, find the speed of the ...

**Science - physics**

the fence posts around a large pasture are 2.5m apart. a horse starts running west beside the fence. when the horse passes the fifth fence post, your second hand is on the 9.0 mark. when the horse passes the fourteenth fence post, the second hand is on 11.5 seconds. what is ...

**Physics**

A motorboat is headed [W35ºN] with its engine set to move the boat at 25 km/h in still water. The current is flowing at 18 km/h [S]. What is the velocity of the boat relative to the shore? My work: cos(35º)=x/25 25cos35=x x=20km/h I have an issue with finding the direction. ...

**Physics**

A ball is dropped from the top of the 9th storey building reaches the ground in 3 sec .find the height of the building

**physics**

a cart is moving horizontally along a straight line with constant speed of 30m/s.a projectile is fired from the moving cart in such a way that it will return to the cart has moved 80m.at what speed,relative to the cart and at what angle to the horizontal must the projectile be...

**Physics**

trainA is moving at speed of 115 km/hr on a track on the same track 100 m away a trainB is moving at speed 25km/hr what should be the least retardation of trainA so that it doesn't collide? My answer is coming as 63 km/he but it's wrong please help?

**Physics**

The density of the dead sea is 1.24x10^3 kg m^-3. A wooden board with an area of 2.5m^2 is dropped in the Dead Sea. Calculate the proportion that would float above the surface. Density of wood= 800kg m^-3

**Physics**

Suppose 11.0 g of ice at -10.0∘C is placed into 300.0 g of water in a 200.0-g copper calorimeter. The final temperature of the water and copper calorimeter is 18.0∘C. 1)What was the initial common temperature of the water and copper? (Express your answer to three ...

**Physics**

What is the normal pressure of the atmosphere at the summit of Mt. Everest, 8850m above sea level? (Assume g is constant and that the density of air, ρ, is proportional to the pressure, P, at any height. Use the values at sea level ρ0 = 1.29kg/m3 and P0 = 1.013 × 105N/m2.)

**Physics**

The density of the dead sea is 1240kg/m^-3. Calculate the depth at which the pressure would be 3 atm

**PHYSICS**

A rope is stretched between 2 walls and the ends are fixed in position. The linear mass density of the rope is 0.6 kg m. the tension in the rope is 240 N.? the image can be google on socratic. just copy paste the question.

**physics**

A circular-motion addict of mass 83.0 kg rides a Ferris wheel around in a vertical circle of radius 11.0 m at a constant speed of 6.10 m/s. (a) What is the period of the motion? What is the magnitude of the normal force on the addict from the seat when both go through (b) the ...

**Physics**

A 15kg box is given an initial push so that it slides across the floor & comes to a stop. I the coefficient of friction is .30, a) find Ffr- Fg=mg - Fg=15kg(9.8N/kg)=147N Ffr=mu(Fn) - Ffr=.30(147N)=44.1 b) Find the acceleration of the box. Hint: what is the net force as the ...

**physics**

Determine the frequency and period for a pendulum of length 250cm, mass of 500g, and amplitude of 25cm I don't understand how to do this, help would be appreciated! Thank you

**Physics**

A 15 kg box is given an initial push so that it slides across the floor & comes to a stop. If the coefficient of friction is .30, A) Find the Ffr Fg=mg=Fg=15(9.8)=147N Ffr=mu(Fn)- Ffr=.3*147N=44.1N B)Find the acceleration. Hint: what is the net force as the box slides to a ...

**Physics (I have a test tomorrow)**

What power is required to accelerates a 1980kg car from 30km/h to 70km/h against a constant force of resistance of 750N over a distance of 85m. Thank you for your help!

**Physics II**

For an object which is 4.0 mm in height located 6.0 cm to the left of a converging lens (positive f) of focal length +9.0 cm, determine the image location and characterize it. Show your work here. No Calculator. Image is located ________________cm to the ______________ of the ...

**Physics**

A tow truck pulls a car from rest onto a level road. The tow truck exerts a horizontal force of 1500 N on the car. The frictional force on the car is 810 N. Calculate the work done by each of the following forces on the car as the car moves forward 12 m: (a) the force of the ...

**Physics**

What does it mean when the position vs. time graph is below the x-axis?

**Physics**

A hockey puck is given an initial speed of 6.7 m/s. If the coefficient of kinetic friction between the puck and the ice is 0.08, how far (in m) does the puck slide before coming to rest?

**pls help physics hw**

You drive down the road at 39 m/s (88 mi/h) in a car whose tires have a radius of 34 cm. What is the period of rotation of the tires? 2pi*34cm/39= 5.4776 rev/ sec is this right or has to be sec/rev

**Physics (I have a test tmrw)**

The half-life of Strontium-90 is 28 a. If 60 g of this isotope is currently in a sample of soil, estimate the amount in the same sample 84 a later. So I did a=60g(1/2)^84/28 But I don't know if thats correct. Thank for your help!

**physics problem**

You drive down the road at 39 m/s (88 mi/h) in a car whose tires have a radius of 34 cm. What is the period of rotation of the tires?

**physics pls help i found answer but its wrong**

Some dragonflies splash down onto the surface of a lake to clean themselves. After this dunking, the dragonflies gain altitude, and then spin rapidly at about 1100 rpm to spray the water off their bodies. When the dragonflies do this "spin-dry," they tuck themselves into a "...

**physics**

Find the coordinate of the center of mass of the bricks shown in the figure.(Figure 1) Express your answer in terms of L. <------------ L---------> <---L4---> ---L2------> -------------------------------------------> 0 X

**PHYSICS**

A MACHINE HASA VELOCITYRATIO5 IS 80% EFFICIENT. WHAT EFFORT WOULDNEEDED TO LIFT A LOAD OF200N WITH THEAIDOFTHIS MACHINE

**PHYSICS**

A concave mirror with a radius of curvature of 0.61 m is illuminated by a candle located on the symmetry axis 2.61 m from the mirror. Where is the image of the candle? Answer in units of m.

**Physics**

a body moving with uniform acceleration travels 84m in First6s and 180m in next 5s . Find the initial velocity and acceleration of body

**Physics**

If you were to launch a block with m = 0.500 kg up a ramp with θ = 15ο and µk = 0.30 with a plunger with k = 100 N/m which compresses by 0.040 m, what distance would you expect to travel?

**physics**

a helicopter lifts a 72kg astronuat 15m vertically from the ocean by means of a cable. the acceleration of the astronuat is 9/10. how much work is done on the astronuat by; a)the force from the helicopter and b) the gravitational force on her? just before she reaches the ...

**Physics**

A box is being pulled along a rough horizontal surface by a rope which has a tension of 10N at an angle of 60 degrees with the horizontal. If the box moves with constant velocity find the frictional force and the normal reaction force given the weight of the box is 100 N

**Physics 1401**

An ideal meter stick is balanced on a pencil which is at the 60 cm mark. A 6 gram mass sits at the 90 cm mark. What is the mass of the meter stick? Again, I have the answer and it is 18g. I have no clue where to even begin with this questions. Thank you in advance.

**physics**

200g of steam at 110°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?

**Physics 1401**

An ideal meter stick is balanced on a pencil which is at the 60 cm mark. A 6 gram mass sits at the 90 cm mark. What is the mass of the meter stick? Again, I have the answer and it is 18g. I have no clue where to even begin with this questions. Thank you in advance.

**Physics 1401**

A 30 N object I a hung from a scale and dunked in water (density of 1000 kg/m^3), the measurement on the scale is only 20 N. what is the density of the object? Answer is 3000 kg/m^3, can someone show me how? Would be very appreciated.

**Physics**

Which of the followings is correct for waves? a. One wave can cancel another wave so that no amplitude remains at certain points. b. While you are at rest, a car moves toward you while it is making noise. The speed of this sound wave is greater than when the car is stationary...

**Physics**

What can be said about the electric force between two charged particles? a. it is repulsive for unlike charges. b. it varies as 1/r. c. it depends only on the magnitudes of the charges. d. it is much, much greater than the attractive gravitational force.

**physics**

a block and tackle with a velocity ratio f 5 is used to raise a mass of 25kg through a vertical distance of 40cm at a steady rate.if the effort is equal to 60N .Determine 1.)the distance moved by he effort 2.)the work done by the effort in lifting the load 3.)the loss in ...

**physics**

Two point charges of magnitude +3.0 nC and +2.0 nC respectively are placed 2.0cm apart. Calculate the resultant electric field strength at their midpont E= E1 + E2

**Physics**

Two particles are fixed on an x axis. Particle 1 of charge 70.5 μC is located at x = -28.5 cm; particle 2 of charge Q is located at x = 21.2 cm. Particle 3 of charge magnitude 37.4 μC is released from rest on the y axis at y = 28.5 cm. What is the value of Q if the initial ...

**physics help**

Some dragonflies splash down onto the surface of a lake to clean themselves. After this dunking, the dragonflies gain altitude, and then spin rapidly at about 1100 rpm to spray the water off their bodies. When the dragonflies do this "spin-dry," they tuck themselves into a "...