# Homework Help: Science: Physics

## Recent Homework Questions About Physics

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
Where F is the tension in the string and µ is the linear density (mass per length) of the string. A violin string vibrates at the fundamental frequency of 512 Hz under the tension of 480 N. What should be the tension in the string to achieve a fundamental frequency of 460 Hz...

physics
The number of times a wave vibrates per second is called: A. frequency B. period C. wavelength D. amplitude E. rarefaction This is frequency right? (A)

physics
Pendulum A with mass m and length l has a period of T. If pendulum B has a mass of 2m and a length of 2l, how does the period of pendulum B compare to the period of pendulum A? A. The period of pendulum B is 2 times that of pendulum A. B. The period of pendulum B is half of ...

physics
A 2.0 kg mass is attached to the end of horizontal spring (k = 50 N/m) and set into simple harmonic motion with an amplitude of 0.10 m. What is the maximum speed of the mass? (Assume there is no friction.) A. 0.25 m/s B. 0.5 m/s C. 1.0 m/s D. 2.5 m/s E. 5.0 m/s

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 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
Evaluate the following statement (T/F/N), explain: If you reduce by half the distance between two point charges, you double the magnitude of electrical force that each exerts on the other.

AP physics
search "ap waves and sound free response questions answers" into google and click on the second one that pops up. answers are on the bottom of the page. question number 23 i don't understand why it is B.

physics
A plane is cruising at 155.00 km/h increases it speed to 285.1 km/h in just 11.5 s as it makes a dive. What was the acceleration of the plane? a = vf - vi / t

Physics
A 30km/h (8m/s) gust of wind results in 25 N of force on a kite that pulls a 50kg kiter off her feet and drags her 8m. How much work does the kite do?

PHYSICS
A stone thrown from the top of a building is given an initial velocity of 40.0 m/s straight upward. The building is 70.0m high, and the stone just misses the edge of the roof on its way down, determine (A) The time at which the stone reaches its maximum height, (B) The maximum...

Physics
Why are w=fxd and E =mc2 both energy

Physics
Point A is - 52m and point B is + 32 m. A car travels from point A to B in 1.2s. What is the speed and velocity of the car. If the car stops at B and returns to A what is the distance traveled and the displacement?

If the abesolute pressur at the bottom of a fresh water pond is 2.313*10^5 PA,what will be the depth of the pond?

Physics
To make ice cubes you fill am ice tray with 150g of water at 20°C. How much energy must be removed from the water to create ice cubes at a final temperature of -10C

Science, Physics
Assume you are speeding down the freeway at 75 mph. The car weighs 1500 kg and the effective force of the brakes is 14400 N. The car in front of you suddenly slows down, it takes 3 seconds for the car to do so. Your initial velocity was 33.53 and your final velocity is 0. If ...

PHYSICS
If the absolute pressur at the bottom of a fresh water pond is 2.313time10^5PA.what will be the depth of the pond?

physics
2. What value did you calculate for the index of refraction of the glass block in Part 2? How does your value compare to the accepted value of 1.53? Calculate the percentage error. Different materials have distinct indexes of refraction. Explain how you might identify a ...

Physics
I am not getting the difference between distance and displacement.... without using the words scalar and vector quantity, of course, i know what they mean but still i need help with this... so please help!!!

physics/chemistry:sir steve drbob222 steve steve
A crystal is grown by evaporating A and 8 type atoms, and then letting them condense to form the crystal. If, because of the forces involved, on A atom is twice as likely to stick to the crystal OS a B atom, what is the probability that the final crysta pls show step i dont know

Physics
What is the mass of the meterstick shown in the figure (Hint: 25% of the meterstick’s mass is to the left of the fulcrum and 75% is to the right)?

Physics
Please help A fully loaded aircraft has a mass of 3.3×10^5 kg.its total wing area is 500m2 . It is in level flight with a speed of 960km/h. Calculate the pressure difference between the lower and upper surface of the wings. Thank you!

physics
A block with a mass of 2.85 kg is hung by a vertical spring of stiffness 13.3 kg/s2. The damping force is given by -b(dx/dt)m where b = 364 g/s. The block is pulled down 12 cm and then released. (a) Calculate the time required for the amplitude of the resulting oscillations to...

Physics (Attempt 3 for help)
A person with the weight of 691 N stands on a bathroom scale in a motionless elevator. The elevator begins to move and the scale momentarily changes to 499 N. (a) Draw a force diagram of the situation. (b) Create a qualitative vertical equation for this situation. (c) ...

Physics
The exterior walls of a house have a total area of 220 m2 and are at 11.9°C and the surrounding air is at 6.7° C. Find the rate of convective cooling of the walls, assuming a convection coefficient of 3.4 W/(m2 · C°).

Physics
A car of mass 1.33 103 kg is initially moving on a level road at a speed of 18.0 m/s. Compute the increase in temperature of the brakes, assuming that all the mechanical energy ends up as internal energy in the brake system. Assume a total heat capacity of 10,000 J/C°.

Physics
Ice of mass 12.0 kg at 0.00° C is placed in an ice chest. The ice chest has 3.10 cm thick walls of thermal conductivity 1.00 10-5 kcal/s · m · C° and a surface area of 1.20 m2. (a) How much heat must be absorbed by the ice before it melts? (b) If the outer surface of the ...

Physics
A commercial heat pump has CP=3 when the indoor temperature is 20°C and the outdoor temperature is 6°C. How much work is required to operate it if 3*10^6J of heat must be transferred to the room each hour?

physics
1. a) using heat exchange and conservation of thermal energy determine the specific latent heat of fusion for ice. b) determine the percentage error The data we determined was: Hot water: mass - 0.1kg initial temp-87C final temp - 56 C Melted ice: mass - 0.024 kg Initial temp...

Physics! HElp
A <10.0+A> g ice cube at -15.0oC is placed in <125+B> g of water at 48.0oC. Find the final temperature of the system when equilibrium is reached. Ignore the heat capacity of the container and assume this is in a calorimeter, i.e. the system is thermally insulated ...

physics
A 37.0 g ice cube at -15.0 degreesC is placed in 224 g of water at 48.0 degreesC. Find the final temperature of the system when equilibrium is reached. Ignore the heat capacity of the container and assume this is in a calorimeter, i.e. the system is thermally insulated from ...

physics
A person with the weight of 691 N stands on a bathroom scale in a motionless elevator. The elevator begins to move and the scale momentarily changes to 499 N. (a) Draw a force diagram of the situation. (b) Create a qualitative vertical equation for this situation. (c) ...

physics
an aircraft is travelling from calabar to kano, it first flies to ilorin on 40 degree covering a distance of 80km, it then flies 120 degree and covers a distance of 40 km to kano. find the distance between calabar and kano

Physics
The relative density of an alloy is 6.5,calculate the mass of the solid alloy cube of sides 20cm.what volume of alloy has a mass of 3kg

physics
The force of interaction between two charges q1=6uC and q2=2uC is 12N. If charge q=-2uC is added to each of the charges then the new force of interaction is

Physics
A step-up transformer has 500 turns on its primary and 1000 turns on its secondary. When the primary is connected to 100 V and the secondary is connected to a floodlight that draws 4 A, what is the power output?

Physics
A transformer has 120 V across the 100-turn primary coil and has 5 turns in the secondary coil. If the current in the primary coil is 0.1 A, how much power is dissipated in the secondary coil?

Physics
Dean is hunting in the Northwest Territory at a location where the earth's magnetic field is 7.0x 10^-5 T. He shoots at a duck decoy by mistake, and the rubber bullet he is using acquires a charge of 2.0 x 10 ^ -12 C as it leaves his gun at 300m/s, perpendicular to the earth's...

physics
What is the difference between a step-up and a step-down transformer? Give examples where each would be used.

physics
The hood ornament of Abe's car is shaped like a ring 0.06m in diameter. Abe is driving toward the west so that the earth's 5.0x10^-5 T field provides no flux through the hood ornament. What is the induced voltage in the metal ring as Abe turns from this street onto one where ...

Physics
What happens to a current-carrying wire that is located in a magnetic field? Does the orientation (angle) of the wire make a difference? Explain.

Physics
A wasp accumulates 1.0x10^-14C of charge while flying perpendicular to the earth's magnetic field of 4.0X10^-5T. How fast is the wasp flying if the magnetic force acting on it is 3.0x 10^-16N?

Physics
Evelyn wears glasses whose wire frames are shaped like to circles, each with an area of 8.0x10^-4 m^2. The horizontal component of the earths' magnetic field in Evelyn's hometown is 3.9x10^-5 T. If Evelyn turns her head back and forth, rotating it through 90degrees every 0.5s...

Physics
Water flows from a fire truck through a hose that is 11.7 cm in diameter and has a nozzle that is 2.0 cm in diameter. The firemen stand on a hill 5.0 m above the level of the truck. When the water leaves the nozzle, it has a speed of 20.0 m/s. 1) Determine the minimum gauge ...

physics
A 0.5-kg block slides along a horizontal frictionless surface at 2m/s. It is brought to rest by compressing a very long spring of spring constant 800N/m. The maximum spring compression is:

Physics
Determine the percentage error. So we found that aluminium has a specific heat capacity of 18441J/KgC And I know that the percentage error = mv-av/av x 100% But how do we know the actual value of aluminium? My teacher never gave it to us. And when it says mv-av does it mean ...

Physics
A charge of -17 nC is on the X axis at the origin. A charge of -24 nC is on the X axis at 11 cm. Find the electric field (magnitude and direction) at 19 cm on the X axis. I believe to solve this problem, the equation E = kC (q1/r1^2) must be used for each of the charges ...

physics
A skateboarder at a skate park rides along the path shown in (Figure 1) . a=2.7 m and b=1.0m If the speed of the skateboarder at point A is v=1.6m/s, what is her speed at point B? Assume that friction is negligible.

physics pls help
The resilin in the body of a flea has a force constant of about 28 kg, and when the flea cocks its jumping legs, the resilin associated with each leg is stretched by approximately 0.10 mm. Part A Given that the flea has a mass of 0.56 mg, and that two legs are used in a jump, ...

physics
A step-up transformer has 40 turns on its primary and 100 turns on its secondary. When the primary is supplied with an alternating current at 140 V, what is the voltage across the secondary?

physics
Dean is hunting in the Northwest Territory at a location where the earth's magnetic field is 8.0x 10^-5 T. He shoots at a duck decoy by mistake, and the rubber bullet he is using acquires a charge of 3.0 x 10 ^ -12 C as it leaves his gun at 300m/s, perpendicular to the earth's...

physics
The hood ornament of Abe's car is shaped like a ring 0.06m in diameter. Abe is driving toward the west so that the earth's 5.0x10^-5 T field provides no flux through the hood ornament. What is the induced voltage in the metal ring as Abe turns from this street onto one where ...

physics
What is the difference between a step-up and a step-down transformer? Give examples where each would be used.

physics
a gun fires a 3g bullet with a speed of 400m/s. the gun barrel is 20cm long. how much energy is given to the bullet?

physics
Evelyn wears glasses whose wire frames are shaped like to circles, each with an area of 7.0x10^-4 m^2. The horizontal component of the earths' magnetic field in Evelyn's hometown is 4.9x10^-5 T. If Evelyn turns her head back and forth, rotating it through 90degrees every 0.5s...

Physics
A proton accelerates through a particle accelerator, with a final speed of 8.0 x 10^6 m/s. It experiences a magnetic field of 3.0T that is produced by steering magnets inside the accelerator. What is the number of the magnetic force pulling on the proton?

Physics
A nuclear plant on a submarine produces steam at 350C to drive a steam electric turbine. the temperature on the low side of the turbine is 27C. how much energy is dissipated as waste heat

Physics
Compute the entropy change of a system consisting of 1kg of ice at 0•C which melts (reversibly) to water at the same temperature. The latent heat of melting is 79.6 Cal/g

Physics
An ideal gas at 17•c has a pressure of 760 mmHg and is compressed adiabatically until its volume is halved.Calculate final temperature of the gas assuming Cp= 2100 J/kg/K and Cv=1500J/kg/K

Physics
An ideal gas at 17•c has a pressure of 760 mmHg and is compressed adiabatically until its volume is halved.Calculate final temperature of the gas assuming Cp= 2100 J/kg/K and Cv=1500J/kg/K. Show working please

Physics
An ice cube tray of negligible mass contains 375 g of ice at -5.00 C. What minimum amount of heat must be added to make all the ice into water?

physics
If an ideal gas does positive work on its surroundings, we may assume, with regard to the gas: A. Volume increases B. Internal energy decreases C. Pressure decreases D. Temperature increases E. Pressure increases

physics
Two moles of neon gas at 25oC and 2.0 atm is expanded to 3 times the original volume while the pressure is reduced to 1.0 atm. Find the end temperature. A. 447degreesC B. 174 degreesC C. -66 degrees C D. 38degreesC E. 150degreesC

physics
Consider a 10 gram sample of a liquid with specific heat 2 J/g*K. By the addition of 400 J, the liquid increases its temperature by 10 K and then boils. Half of the liquid boils away before all the heat is used up. What is the heat of vaporization of the liquid? A. 10 J/g B. ...

physics
A 48-N object floats in a pool. If 75% of the volume of the object is immersed in the water, which statement is true about the buoyant force FB on the object? A. FB=48N B. FB=36N C. FB=64N D. FB=12N E. This is not possible to answer with the information given.

physics
A cable is 100 m long and has a cross-section area of 1 mm2. A 1000-N force is applied to stretch the cable. If Young’s modulus for the cable is 1.0x1011 N/m2 , how far does it stretch? A. 10. m B. 1.0 m C. 0.10 m D. 0.01 m E. 0.001 m

Physics
In a single-slit diffraction pattern, the distance between the first and second minima is 4.2cm on a screen 3.8m from the slit. Find the slit width given that the wavelength of the light is 530nm. Answer in mm Somebody please help!

physics
A 75.0 kg person bends his knees and then jumps straight up. After his feet leave the floor, his motion is unaffected by air resistance and his center of mass rises by a maximum of 13.5 cm. Model the floor as completely solid and motionless. With what momentum does the person ...

physics
A 75.0 kg person bends his knees and then jumps straight up. After his feet leave the floor, his motion is unaffected by air resistance and his center of mass rises by a maximum of 13.5 cm. Model the floor as completely solid and motionless.

Physics
Using heat exchange and conservation of thermal energy, determine the specific heat capacity for your metal. So the data we have is: Aluminium: Mass - 0.004 Initial temp - 100C Final temp: 32C Water: Mass -0.1 Initial temp - 20C Final temp - 32C I know that the formula is mct...

physics
What is the energy of a photon of yellow light with a frequency of 5.14 Ã— 1014 Hz?

physics question
A skateboarder at a skate park rides along the path shown in (Figure 1) .a=2.7 m and b=1.0m Part A If the speed of the skateboarder at point A is v=1.6m/s, what is her speed at point B? Assume that friction is negligible.

physics
A new record for running the stairs of the Empire State Building was set on February 3, 2003. The 86 flights, with a total of 1576 steps, was run in 9 minutes and 33 seconds. If the height gain of each step was 0.20 m, and the mass of the runner was 70 kg , what was his ...

Physics 30
an 1100 kg car accelerates from rest at 3.4 m/s2. if the horizontal force exetred on the wheels by the road is 5600 N, what force must be resisting the motion of the car? use a free body diagram to illustrate your answer

PHYSICS HELP
A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 31 m high. When it hits the ground at the base of the cliff, the rock has a speed of 29 m/s . a.Assuming that air resistance can be ignored, find the initial speed of the rock . v0= M/S b. Find the ...

Physics
an 1100 kg car accelerates from rest at 3.4 m/s2. if the horizontal force exerted on the wheels by the road is 5600 N, what force must be resisting the motion of the car? use a free body diagram to illustrate your answer.

physics
Pushing on the pump of a soap dispenser compresses a small spring. When the spring is compressed 0.55 cm , its potential energy is 0.0020 J a.What is the force constant of the spring? i found the fist answer is 130N/M B. What compression is required for the spring potential ...

physics
A skier starts at rest and glides (without friction) directly down the fall line from the highest point of a giant snowball with a radius of r=31.7 m . The skier can be observed as a point mass and the air resistance is negligible. What speed v does the skier have when she ...

Physics
An electric kettle rated accurately at 2.5kw is used to heat 3kg of water from 15% to boiling point it takes 9.5 minute. Then the amount of heat that has been lost is

Physics
Derive an expression for escape speed of satellite.

Physics
Calculate the force acting on a body of mass 10 kg moving with a uniform velocity of 2m/s.

Physics
A spring balance has a scale that reads from 0 to 5 kg. The length of scale is 20 cm.a body suspended from this spring, when displaced and released ,oscillates with period of 0.60s.what is the weight of body.

Physics
Two forces whose magnitude are in the ratio 3:5 give a resultant of 28N.if the angle of inclination is 60, find the magnitude of each force.

Physics
A boat travels at 15 m/s in a direction 45° east of north. The boat then turns and travels at 18 m/s in a direction 5° north of east. What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number. What is the direction of the boat’...

Physics
A boat travels at 15 m/s in a direction 45° east of north. The boat then turns and travels at 18 m/s in a direction 5° north of east. What is the magnitude of the boat’s resultant velocity? Round your answer to the nearest whole number. What is the direction of the boat’...

physics
from newton's second law of motion derive the formulae F=ma

physics
Two dimensions. In the figure, three point particles are fixed in place in an xy plane. Particle A has mass mA = 4 g, particle B has mass 2.00mA, and particle C has mass 3.00mA. A fourth particle D, with mass 4.00mA, is to be placed near the other three particles. What (a) x ...

physics
A swimmer sets off from one bank. The velocity of the swimmer relative to the water is 1.2 m / s at 45° to the river banks, as shown in Fig. 1.1. In the space below, draw a scale diagram to determine the resultant velocity of the swimmer relative to the river banks. This ...

Physics
A river is flowing at 3mps.A man can swim in still water at a speed of 6mps.The angle at which the bank at which the swimmer should start ,so that he may cross the river along the shortest distance is?

Physics
Calculate the distance between the two proton such that the electrical repulsive force between them is equal to the weight of either

physics question
a forklift lifts a 100 kg of concrete through a vertical height of 16 m in 20 sec.the power applied to the motor un driving the forklift is 1kw.a) calculate the work done every second in lifting the concrete block.b) what is the power output of the motor?c) what is the ...

physics
a car of mass 1000 kg moving at a speed of 20 m/s is brought to rest through a distance of 100 m by applying the brakes.a)calculate the accleration of the car.b) calculate the force by the brakes assuming that is constant and there is no other resistance.c)calculate the work ...

physics 1
A floating cube is 10 cm on a side and has a density of 800 kg/m^3 . IT is floating in fresh water that has a density of 1000 kg/m^3. what percent of the cube is above the surface of the water? Again, my professor says it is 20%, but how??

physics 1
Glass has a density of about 2500 Kg/m^3. fresh water has a density of 1000 kg/m^3. if a 5 kg block of glass is sitting on the bottom of a freshwater fish tank, what is the normal force on the floor of the tank? 30N is what my professor says is correct, but im confused how?

physics
A bicycle traveling at 9.8 m/s needs to stop in a time of 5s. what coefficient of friction is required? Answer:0.2, can someone possibly show me how this is the answer? i keep getting something else.

physics
A 2.0 kg mass is sliding on a flat surface, with an initial speed of 20 m/s, and a coefficient of friction of 0.2. what is the magnitude of its acceleration? I know the answer is 2.0 m/s^2, but can someone show me how ?

physics
two forces are acting on an object. F1= 60 N is horizontal while F2= -80N is vertical, what is the magnitude of the net force acting on the object? The answer is 100 N, can some one please explain it though?

Physics
An iron piece of mass 360g and a density of 6g/cm if suspended by a rope so that is partially submerged in oil of density 0.9g/cm find the tension (force) in the string

Physics
An iron piece of mass 360g and a density of 6g/cm if suspended by a rope so that is partially submerged in oil of density 0.9g/cm find the tension (force) in the string

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