Friday
December 9, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

PHYSICS
A girl on a carousel has a centripetal acceleration of 21.3 m/s2. What is the acceleration of the girl if the carousel's angular velocity is doubled?
Tuesday, November 29, 2016 by Anonymous

Physics
Hi, I've been having trouble with this physics problem. I'm not sure where to begin. A brick with mass m1=2.5 kg can move without friction on a horizontal plane. The brick is attached to a wall by an ideal spring with spring constant k=2300 N/m. A second brick with ...
Tuesday, November 29, 2016 by Josh

physics
When the experimental set up is immerse in water of refractive index n=1.5.what will be the charge in beta?
Tuesday, November 29, 2016 by Amos

physics
Dependence of fringe width on lamda D and d
Tuesday, November 29, 2016 by Amos

physics
A body at rest explodes into three equal parts, two parts after explosion fly off due north and west respectively with velocity 8m/s then calculate the magnitude and direction of velocity of 3rd pat.
Tuesday, November 29, 2016 by san

physics
When the wind is blowing an average of 31.8 mph, a wind tower with its propellors centered at a height of 80 m off the ground is supplied with energy at a rate of 14.4 kW. A large bank of batteries collects the energy from the wind tower. If the efficiency of each object (...
Monday, November 28, 2016 by Brittany

Physics
A Carnot engine of efficiency 41% operates with a cold reservoir at 24 °C and exhausts 1290 J of heat each cycle. What is the entropy change for the hot reservoir? Answer in J/K. I keep getting the answer incorrect. Here is the work: Efficiency = 100*(Th- Tc)/Th 41 = 100*(...
Monday, November 28, 2016 by Kayla

Physics
A cylindrically shaped piece of collagen (a substance found in the body in connective tissue) is being stretched by a force that increases from 0 to 0.0436 N. The length and radius of the collagen are, respectively, 2.90 cm and 0.0815 cm, and Young's modulus is 3.1 x 106 N...
Monday, November 28, 2016 by BrookeNeed

Physics
A gun is shot horizontally from a building that is 10 meters high at a velocity of 220 meters/ second: I need to know what Vx is and Vy along with answering Vx after 3 seconds Vy after 3 second. We were given these equations Vy= Vy0-9.8t y= y0+Vy0t-4.9t^2 x=Vxt ,but I'm ...
Monday, November 28, 2016 by Anonymous

Physics, Math, Science
A 56 kg student is standing atop a spring in an elevator that is accelerating upward at 3.5 m/s^2. The spring constant is 2300 N/m. By how much is the spring compressed? I'm not exactly sure how to approach this problem, much less solve it. The acceleration threw me off, ...
Monday, November 28, 2016 by Erik

Physics
2. A ham sandwich consists of one slice of ham (7grams) and two slices of bread (25 grams each). You have 1kg of ham and 1kg of bread. You make as many as you can. How many sandwiches did you make? What is the mass of the sandwiches? What is the mass of the ingredients that is...
Monday, November 28, 2016 by Katelyn

Physics
1.Given that 1g of hydrogen combines completely with 8g of oxygen to form water, how much water can you make with 9g of hydrogen and 32g of oxygen?
Monday, November 28, 2016 by Katelyn

Physics - Collisions
A big toy school bus rear-ends a small toy school bus initially at rest. The bigger bus is several times heavier than the smaller one. Which of the following statements are true if the collision is totally inelastic? 1. The big bus exerts the same amount of force on the small ...
Monday, November 28, 2016 by Kid

Physics
What is the change in entropy of the lead when 2.0 kg of molten lead at its melting point temperature solidifies? For lead: L V = 207 kcal/kg at 1744°C, L F = 5.9 kcal/kg at 328°C. Express your answer using two significant figures in kcal/K
Monday, November 28, 2016 by Sabrina

physics
a sound generator is set up 5 m above the diving end of a swimming pool. the depth of the pool is known to be 12 m deep. the generator sends one short pulse of sound down at the pool. it takes 0.05s for an echo to return from the bottom of the pool.What is the speed of sound ...
Monday, November 28, 2016 by kassy

physics
a 7.0kg block and a 12kg block sit on a frictionless table. Between and touching, but not attached to, the blocks is a spring that is compressed by 13.5 cm. the spring has a spring constant of 1200 N/m. if the spring were released at what speed would each block move away.
Monday, November 28, 2016 by kassy

Physics
The figure shows a pV diagram of a gas for a complete cycle. During part bc of the cycle, 1190 J of heat flows into a system, and at the same time the system expands against a constant external pressure of 7.00 × 104 Pa as its volume increases from 0.0200 m3 to 0.0800 m3...
Monday, November 28, 2016 by Sabrina

physics
Just like the efficiency can be used to tell how 'good' an engine is, the Coefficient of Performance can be used to compare refrigerators. If a refrigerator requires 1.21×104 J of work to remove 3.23×104 J of energy from the inside of a refrigerator, what ...
Monday, November 28, 2016 by taylor

Physics
A military jet is flying at 224 m/s in a tight circular turn. If the military jet reaches a centripetal acceleration of 8.00 times the free-fall acceleration, what must the radius of its turn be?
Monday, November 28, 2016 by Physics Lover

Physics
A washing machine needs 17.9 s to speed up from rest to top speed of 5 rotation for every 2.78 s. If the damp cloths inside are 7.13 cm from the center, what is it's radial acceleration at top speed?
Monday, November 28, 2016 by Physics Lover

Physics
A few kids decide to go to the park to go on the merry-go-round. They are the only ones there so the merry-go-round is not moving yet. They push it for 6.00 s and it moves over an angle of 129°. What is the final angular velocity of the merry-go-round?
Monday, November 28, 2016 by Plz

Physics
How much faster would a person be moving if they stood on top of a 18.2 m high building compared to the ground? Take the period to be one day, and the radius of the earth to be 6400 km?
Monday, November 28, 2016 by Impossible

Physics
hi
Monday, November 28, 2016 by Anonymous

physics
A ball is attached to a spring on a frictionless horizontal surface. The ball is pulled to the right and released from rest at t = 0 s. If the ball reaches a maximum speed of 34.1 cm/s and oscillates with a period of 4.50 s, what is the ball's velocity at t = 0.350 s?
Monday, November 28, 2016 by cristiano

Physics
A 27.9 kg block (m1) is on a horizontal surface, connected to a 6.50 kg block (m2) by a massless string as shown in the figure below. The frictionless pulley has a radius R = 0.090 m and a moment of inertia I=0.060 kgm2. A force F = 192.1 N acts on m1 at an angle theta = 32.1&...
Monday, November 28, 2016 by Anonymous

physics
A police van moving on a highway with a speed of 30km/hr, fires a bullet at a theif's car speeding away in the same direction with a speed of 192km/hr. If the muzzle speed of the bullet is 150m/sec. With what speed does the bullet hit the thief's car
Monday, November 28, 2016 by Aarathana

Physics
A 0.1134kg spherical meteor of diameter 3 cm enters the earth’s atmosphere at an elevation of 121920m with a velocity of 13411.2 m/s. The meteor’s temperature is -73.15?C. The specific heat at constant volume (Cv) of the meteor is 800 J/kg?C. (a) If the meteor has a ...
Monday, November 28, 2016 by Jack

physics
A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0*10^-6K^-1. At 22 degrees celsius the period of the swing of the pendulum is 1.00seconds. If the temperature is reduced is reduced by 0.625°C every hour, how much time...
Sunday, November 27, 2016 by alicia

Physics
A block of mass 2.5 kg hangs vertically from a frictionless pulley of mass 6.5 kg and radius 16 cm. Treat the pulley as a disk. Find: a) the acceleration of the block b) the tension in the rope I don't even know where to begin,
Sunday, November 27, 2016 by Ana

Physics
A torque of 50 N*m acts on a wheel of moment of inertia 25 kg*m^2 for 4 s and then is removed. b)How many revolutions does it make in 15 s if it starts at rest? I found the angular acceleration, 2 rad/s^2, but I don't know how to find the amount of revolutions.
Sunday, November 27, 2016 by Ana

physics
A block and tackle pulley system is used to lift a mass of 200 kg.if the machine has a velocity ratio of 5 and efficiency of 80%.sketch the possible arrangement of the system
Sunday, November 27, 2016 by moses

physics
Car A with a mass of 1000kg is travelling east at 25m/s when it collides with car B, 2000kg, travelling north at 15m/s. After the collision, the two cars stick together and have the same velocity. Assume that they slide without friction after collision. (a) What is the final ...
Sunday, November 27, 2016 by Mable

Physics
A bullet of mass 10g strikes a wooden block with velocity of 300m/s after penetrating 20cm into it, it's velocity drops to 200m/s. Then average resistance offered by the block is
Sunday, November 27, 2016 by Appu

Physics
An aluminum (with Young's modulus 7 x 10^10 Pa) rail is 88.0 m long and has cross-sectional area 0.00050 m^2. The rail is fixed at one end and a 4000 N force is applied at the other end. By how much does the bar stretch?
Sunday, November 27, 2016 by Mary

Physics
A brick of mass 2kg just begins to slide down an inclined plane at an angle of 45 degree with horizontal.what will be the force of friction
Sunday, November 27, 2016 by Anonymous

Physics
Block A, with a mass of 10 kg, rests on a 36.9° incline. It is attached to a string that is parallel to the incline and passes over a massless, frictionless pulley at the top. Block B, also with a mass of 10 kg, is attached to the dangling end of the string. The two blocks...
Sunday, November 27, 2016 by ANON

Physics
A substance has the following properties; Boiling Point = 140 °C, Freezing Point = -10 °C, specific heat as a gas, liquid and solid, 0.3 cal/g.C°, 1.8 cal/g.C° and 0.8 cal/g.C° respectively. Heat of fusion =100 cal/g and heat of vaporization = 480 cal/g. ...
Sunday, November 27, 2016 by Clarity

physics
a certain force gives m1 an acceleration of 12m/s^2 the same force gives object m2 an acceleration 3.3m/s^2. wahty acceleration gives to an object having mass(A) the difference m1 and m2 (B)the sum of m1 and m2
Sunday, November 27, 2016 by jino

Physics
(a) Would the pattern change if you were to use a shorter wavelength of light? Clearly state what change(s) would occur (if any) and briefly explain why. (b) The apparatus is surrounded by air. Would the pattern change if it were immersed in water instead? Clearly state what ...
Saturday, November 26, 2016 by Po

physics
An airplane is flying above the Earth's surface at a height of 9.30 km. The centripetal acceleration of the plane is 18.2 m/s2. What is the angular velocity of the plane moving in uniform circular motion? Take the radius of the earth to be 6400 km.
Saturday, November 26, 2016 by Please help

Physics
A tension spring opposes being stretched, but offers no resistance to being compressed (think of a slinky!). A tension spring, with an equilibrium length of 1.25 m, is suspended by one end from a ceiling at a height of 2.5 m above the ground; a mass of 100 g is attached to the...
Saturday, November 26, 2016 by Nick

physics
A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0*10^-6K^-1. At 22 degrees celsius the period of the swing of the pendulum is 1.00seconds. If the temperature is reduced to 5 degrees celcius, how much time does the clock ...
Saturday, November 26, 2016 by dan

Physics
A satellite orbits the Earth in an orbits 750 km high. Find (*) the satellite's orbital speed and (**) period. (The mass and radius of the Earth are 5.98E + 24 kg and 6370000 m, respectively.)
Saturday, November 26, 2016 by Mary

Physics
A bank robber, after completing his heist, jumps into his getaway car and drives away from the scene of a crime, down a straight highway at 40 m/s. A police vehicle follows in pursuit, leaving the bank 2 minutes after the robber left. If the police travel at 42 m/s, how much ...
Saturday, November 26, 2016 by Wei

Physics
If the angle of incidence is 30degree and refractive index is 2 find the angle of refraction.find whether the medium is denser or rarer
Saturday, November 26, 2016 by Anonymous

Physics , static fluids
The density of ice is ?(ice) = 920 kg/m3, and the average density of water is ?(water) = 1.00 g/cm3. What fraction of the total volume of a block of ice is exposed when floating in water? what does this even mean?
Saturday, November 26, 2016 by Andrea

Physics
A plank 3m long and having a mass of 20kg is supported at its ends. Imagine that a person with a mass of 50 kg stands m from one end. What are the magnitudes of the force exerted by the supports?
Saturday, November 26, 2016 by Josh

Physics , static fluids
A particular object weighs 313 N in air and 264 N when immersed in alcohol of density 0.70 g/cm3. What is the volume (in L) and the density (in kg/m3) of the object? I had origionally used the 264N as the force of buoyancy and did the Fb=density*volume*g, then solved for ...
Saturday, November 26, 2016 by Andrea

Physics , static fluids
hello, I hope you can help... A diver accustomed to standard snorkel tubing of length 25 cm tries a self-made tube of length 8.6 m. During the attempt, what is the pressure difference (in kPa) between the external pressure on the diver's chest and the air pressure in the ...
Saturday, November 26, 2016 by Andrea

Physics
A diver accustomed to standard snorkel tubing of length 25 cm tries a self-made tube of length 8.6 m. During the attempt, what is the pressure difference (in kPa) between the external pressure on the diver's chest and the air pressure in the diver's lungs? I've ...
Saturday, November 26, 2016 by Andrea

Physics
A playground merry–go–round has a mass of 118 kg and a radius of 1.80 m and it is rotating with an angular velocity of 0.470 rev/s. What is its angular velocity after a 20.0–kg child gets onto it by grabbing its outer edge? The child is initially at rest.
Friday, November 25, 2016 by Anonymous

Physics
Jacob is a little too excited about finishing his homework and throws his hands up in the to shout, "I'm done!" He accidentally drops his 2.3 kg pencil straight down from a height of 2.12 m. what will be the kinetic energy of the pencil just before it hits the ...
Friday, November 25, 2016 by Anonymous

Physics
Jacob is working on his physics portfolio and stands on a 0.45m high step. If Jacob’s mass is 103kg, what is his potential energy while on top of the step? Givens: Unknown: Equation: Substitute: Solve:
Friday, November 25, 2016 by Anonymous

Physics
A catapult of a spring constant 100N/M contains 2.0J of elastic potential energy when it is pulled back. What is the extension of the rubber band? I know that E= F/K but I don't know how to work out the force from the information provided, help would be much appreciated, ...
Friday, November 25, 2016 by Holly

Physics
A siren emits a sound of frequency 1200 kHz. With which frequency is it received by a car moving at a speed of 20 m/s. a) Away from the siren? b) Towards the siren?
Friday, November 25, 2016 by Rita

Physics y.s.n.
A body start with an initial velocity of 10metre per second move along the straight line with constant acceleration and the velocity of the body is 50 metre per second the acceleration is reversein the direction find the velocity of the particle as it reach the starting point
Friday, November 25, 2016 by Nisha

physics
an aeroplane has a mass of 15 tonnes. At cruising speed,air flows over the top of it's wing at 150 m/s and under the wing at 120m/s. Calculate the pressure in difference between the top and the bottom of the wing and the surface area underside the wing
Friday, November 25, 2016 by Kay

Circuits and electronics applications3
One way to model a vehicle is as a massive object that is connected by springs and shock absorbers to the wheels. Here is a simple model: There is a mass m suspended by a spring with spring constant k and a oil-filled shock-absorber with viscous friction constant b over a ...
Friday, November 25, 2016 by sengeni

Physics, Class XI
If a force of 15 kg. weight acts on a mass of 14 kg, what will be its velocity after 8 seconds? What is the process to apply the formulas in this question? Please help me fast!
Friday, November 25, 2016 by Ritu

Physics
If a force of 15kg. wt acts on a mass of 14 kg, what will be its velocity after 8 seconds?
Friday, November 25, 2016 by Ritu

Physics
Two glass microscope slides, of length 10 cm, are in contact at one end and separated by a sheet of paper at the other end, which creates a wedge-shaped film of air. The thickness of the paper is t = 59 ?m, and the glass has index of refraction n = 1.5. Light with wavelength 0...
Friday, November 25, 2016 by Po

Physics
Find the resultant of 50 N acting east and 30 N acting 30 degrees northeast
Friday, November 25, 2016 by Ilith

physics
a body of massb20kg slides down a plane inclined at 30degree to the horizontal if a constant resting force of 40N act on the body it acceleration down the plane is what? f=mgsin ma=mg sin 20×a=20×10sin30 20a=100 a=50
Thursday, November 24, 2016 by favour

physics
a body of massb20kg slides down a plane inclined at 30degree to the horizontal if a constant resting force of 40N act on the body it acceleration down the plane is what?
Thursday, November 24, 2016 by favour

math,physics,chemisty,biology
the number of moles of H2O2 required to completely react with 400ml of 0.5N KMnO4 in acidic medium are
Thursday, November 24, 2016 by Chanchal

Momentum physics 11 conceptual question
A pitcher throws a fastball to a catcher. assume the speed of the ball does not change Which player exerys the larger impulse on the ball Which player exerts the larger force on the ball?
Thursday, November 24, 2016 by Penny

physics
To test the speed of a bullet, you create a pendulum by attaching a 5.40 kg wooden block to the bottom of a 2.40 m long, 0.700 kg rod. The top of the rod is attached to a frictionless axle and is free to rotate about that point. You fire a 10 g bullet into the block, where it ...
Thursday, November 24, 2016 by jasmine

physics
Two blocks are connected by massless string that is wrapped around a pulley. Block 1 has a mass m1=6.50 kg, block 2 has a mass m2=2.50kg, while the pulley has a mass of 1.40 kg and a radius of 22.0 cm. When the pulley turns, there is friction in the axel that exerts a torque ...
Thursday, November 24, 2016 by jasmine

Physics
A bike wheel is spun until it reaches an angular velocity of 2.00 rad/s. It was spun for 1.96 s. What was its change in angle during this time if it started from rest?
Thursday, November 24, 2016 by Physics Lover

physics
A 0.200 m long string that has a ball attached to it is spinning around on a flat horizontal plane. It spins over a 116° angle in 0.360 s. What is the centripetal acceleration of the ball if it is in uniform circular motion?
Thursday, November 24, 2016 by Physics Lover

Physics
A merry-go-round has an angular velocity of 5.20 rad/s. A ribbon is tied at the end of one of the arms and it has speed of 3.60 m/s. At what distance is the ribbon from the center of the merry-go-round?
Thursday, November 24, 2016 by Physics Lover

physics
A ladder has a weight of 400 N and a length of 10.0 m, it is plac s over a wall without friction. A person whose wight is of 800N stands in the ladder and is 2m from the bottom of the ladder, which is 8 m over the inferior part of the wall. Calculate the force that the wall ...
Thursday, November 24, 2016 by Leela

physics
A liquid stands at the same level in the u-Tube when at rest what will the difference in height h of the liquid in the two limbs of the u-Tube, when the system is given An acceleration a towards right? take a as area of a cross section and G as the acceleration due to gravity
Thursday, November 24, 2016 by vijay kumar

Physics
A truck travelling at 50 kph. It brakes retarding it at 5 m/sec. How long it will take up to stop the truck? What distance reached it when it finally stop?
Thursday, November 24, 2016 by Ilith

physics
a bullet is fired into a trunk of a tree losses1/4 kinetic energy in travelling distance of 5cm .before stopping it travels a further distance of ....
Thursday, November 24, 2016 by vasu

Physics
Two questions and a small confusion that is not letting me do my homework: When is said that an object is rotating it is mandatory that the addition of rotational momentums gives 0? Under what conditions, two forces of same magnitude but different direction exerted in a body, ...
Thursday, November 24, 2016 by Kim

physics
A student uses spring balance of range 500gwt. He records the weight of a small iron cube of mass 100g in air, in tap water and in a concentrated solution of common salt in water. His three readings taken in the goben order are w1,w2,w3 his measurement is
Thursday, November 24, 2016 by hari

physics
a particle starts from rest and travels a distance x with uniform acceleration, then it travels a distance 2x with uniform speed ,finally it travels a distance of 3x with uniform retardation and comes to rest. If the whole motion of the particle is a straight line, then the ...
Thursday, November 24, 2016 by hari

Physics
A 5kg ball is dropped from a height of 10m a) find the initial potential energy of the ball B. Find the kinetic energy of the ball just before it reaches ground. C. Calculate the velocity before it reaches the ground.
Thursday, November 24, 2016 by Tejika Bajaj

Physics
A bullet of mass .03 kg moving with a speed of 400m/s penetrates 12cm into a fixed block of wood calculate the average force exerted by the wood on the bullet.
Thursday, November 24, 2016 by Tejika Bajaj

physics
A stone of 400g is whirled by a string of length 2.8m so that it moves in horizontal circle of radius 0.7m.find the tension on the string.
Wednesday, November 23, 2016 by valenten

Physics
Suppose that at least 14.7 eV is needed to free an electron from a particular element, i.e., to ionize the atom. What is the lowest frequency photon which can accomplish this? And, what is the corresponding wavelength for that photon?
Wednesday, November 23, 2016 by Niki

physics
a curve along the highway is to be banked for traffic expected to move at 80km/hr. find the angle of banking if the radius of the curve is 100 meters
Wednesday, November 23, 2016 by denver

Physics
A water tank is 20 metre Doon Ek Baar water barometer is estimated that Palace then what is the pressure at the bottom of the tank in atmosphere
Wednesday, November 23, 2016 by Vijay

Physics
A water tank is20m deep if the water barometer reads10m at that place then what is the pressure at the bottom of the tank in atmosphere
Wednesday, November 23, 2016 by Vijay

Physics
A force F =(8.700 N)i +(?9.000 N)j F?=(8.700 N)i +(?9.000 N)j is exerted on a particle located at r=(?8.400 m)i +(7.700 m)j r?=(?8.400 m)i +(7.700 m)j. What is the torque on the particle about the origin?
Wednesday, November 23, 2016 by Grace

physics
A boy has a mass 40kg and a girl of mass 30kg play on a see-saw, where must the girl sit to make it balance?
Wednesday, November 23, 2016 by atiyya

physics
A girl uses a spanner of length 20cm to tighten a nut. IF she pulls at right angles to the end of the spanner with a force of 50N, calculate the moment of her pull
Wednesday, November 23, 2016 by atiyya

Physics
How could you use 100 pounds of force to lift a 200 pound weight? Explain precisely, listing any necessary distances and details. (This will take some converting!) I don't understand this question, could someone please help me? I think I only need the distances from the ...
Wednesday, November 23, 2016 by Nathaly

Science Physics
An air plane flies 20 km in a direction 60 degree west of north then 40 km straight east and then 10 km in a direction 30 degree north of east . How far and at what direction is the plane from the starting point?
Wednesday, November 23, 2016 by Kundan Subedi

Physics
How could you use 100 pounds of force to lift a 200 pound weight? Explain precisely, listing any necessary distances and details. (This will take some converting!) I don't understand this question, could someone please help me? I think I only need the distances from the ...
Wednesday, November 23, 2016 by Nathaly

Physics
You are given five identical resistors each of resistance r. How can you arrange all these resistors (in series, in parallel, or both) in order to have an equivalent resistance of 7r/2, 7r/3 or 2r
Wednesday, November 23, 2016 by Sarah

physics
Find the gravitational force of attraction between two balls each weighing 10 kg,when placed at a distance of 1 meter apart
Wednesday, November 23, 2016 by saddam

physics
Does the kinetic energy of a car change more when it speeds up from 10 to 15 m/s or from 15 to 20 m/s? Explain.
Wednesday, November 23, 2016 by Anonymous

physics
Does the kinetic energy of a car change more when it speeds up from 10 to 15 m/s or from 15 to 20 m/s? Explain.
Wednesday, November 23, 2016 by Anonymous

Physics
While analyzing a sample of one, geologist finds that it weighs 2n in air and 1.3N when immersed in water. Calculate the density of the one
Wednesday, November 23, 2016 by Jenner

Physics
A ball thrown downward with an initial velocity of 20m/s.what will be itsvelocity after 5s
Wednesday, November 23, 2016 by Subhasong

Physics
A 5 gm bulet initial velocity is 300ms-1 and after penetrating a 5cm plank then the bulet stopped . So how much time is needed to penetrate the plank..?
Wednesday, November 23, 2016 by Alvi

vertical motion physics
a body projected vertically up from ground crosses a point Pafter 4 seconds and again after 6 seconds Maximum height reached by that body above the ground is (g=10m/s)
Wednesday, November 23, 2016 by devi

physics
Two forces are applied to a 0.5 kg hockey puck causing it to accelerate. The first force has a magnitude of 10.0 N and is applied to the puck at an angle of 80 degrees with respect to the x axis. The second force has a magnitude of 3.5 N and is applied to the puck at an angle ...
Tuesday, November 22, 2016 by Mark

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