Friday
September 4, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
An amt of ice was added to a 8.25 kg tubof water at 25.0°C. If their final temp is 18.2, what mass of ice was added? Please help, I keep getting the wrong answer
Wednesday, June 3, 2015 by HELP PLEASE ASAP

Physics
A block of iron at 415°C is put into a 0.625 kg tub of water at 15.0°C. They come to equilibrium at 100°C, and 0.144 kg of the water boils off to steam. What is the mass of the iron block? Please help, it keeps saying I have the wrong answer.
Wednesday, June 3, 2015 by HELP PLEASE ASAP

Physics
1.33 kg of ice at 0°C is added to an 8.25 kg tub of water at a warmer temp. If their final temp is 15.7°C, What was the inital temp of the water in the tub? Please help, I cannot get the right answer.
Wednesday, June 3, 2015 by HELP PLEASE ASAP

Physics
Emily makes 0.250 kg of hot tea at 99.0°C. How much ice at 0.00°C must she add to the tea so that the mixture reaches a final temp. of 8.00°C? (You may treat the tea as if its water.) PLEASE HELP ASAP, I DO NOT KNOW HOW TO SOLVE THIS PROBLEM
Wednesday, June 3, 2015 by HELP PLEASE ASAP

Physics
I really need help with this question, i've found that a texbook said fourth hand, but I dont know if thats a thing Which rule is used to find the direction of force produced by electromagnetic induction? a. First right-hand rule b. Second right-hand rule c. Third right-...
Wednesday, June 3, 2015 by Al

physics
A blob of mass 5 kg is place on a table top.it is attached to a mass piece of 2kg by a light string that passes over a frictionless pulley.the table top exerts a frictional force of 7 N on the block (a) calculate the tension of the string
Wednesday, June 3, 2015 by nyove

Physics
I need some help with a few multiple choice quadroons that I don't understand 1.EMF is best described as a(n) a. electric force. b. energy measure. c. charge flow rate. d. potential difference. 2. Which rule is used to find the direction of force produced by ...
Wednesday, June 3, 2015 by Al

physics
a person covers a distance of 31 km and displacement 3 kms and time 25.5 min calcuclate average velocity
Wednesday, June 3, 2015 by pranavi

physics
A block of wood experiences a normal force of 32 N from a rough,flat surface.there is a rope tied to the blobk.the rope is pulled parallel to the surface and the tension in the rope can be increased to 8 N before the block starts to slide. how can i determine the coefficient ...
Wednesday, June 3, 2015 by idesel

physics
Three co-linear forces f1=45 N west,f2=63 N east and an unknown force f3 are applied to an object.the resultant of the three forces is 12 N west determine the magnitude and direction of the force f3 using algebraic calculations. Thank you indvance.
Wednesday, June 3, 2015 by melissa

physics
A rocket of mass 5 000 kg is launched upwards into the sky at an acceleration of 20 m.s^-2. (a) Calculate the magnitude (b) calculate the direction of the thrust of the rocket's engines thanks in advance
Wednesday, June 3, 2015 by kem

physics
A man applies a force of 150 N to pull a 20kg box with a rope that makes an angle of 60 degrees with the horizontal.the box experiences a kinetic friction of 15 N. calculate the acceleration of the box. thanks in advance
Wednesday, June 3, 2015 by lesedi

physics
consider the arrangement of four +20 microCouloumb point charges located at all 4 corners of a square with 30cm sides. calculate the magnitude and direction for the force on each charge due to the other 3 point charges.
Tuesday, June 2, 2015 by gipi

physics
can someone help me with this, two positive points charges q=10uc and q2 5uc are placed at the top right and bottom left of a square of side 20cm respectively, I was told to find it's magnitudes an directions of the forces erected by each charge.
Tuesday, June 2, 2015 by mr. yamo

Physics
Assume that Earth’s magnetic field is every- where perpendicular to the path of a proton and that Earth’s magnetic field has an inten- sity of 4.10 × 10−8 T. What speed would a proton need to achieve in order to circle Earth 1170.0 km above the magnetic ...
Tuesday, June 2, 2015 by Cassandra

Physics
We have to work out the accepted value of a roller coaster cart (taking into account friction) when the mass is modified Here is the answer I got for 56.71 grams: 0=∆EGP+∆EK+Fd 0=mg(hf-hi )+1/2 m(v^2-u^2 )+Fd 0=0.05671 × 9.8 (0.075-0.786)+1/2× 0.05671 (...
Tuesday, June 2, 2015 by Madi

physics
consider a vertical piston system. the piston has a 50g mass and a given radius of 3mm. what amount of pressure does the piston exert? ( use g==9.8 m/s^2 )
Tuesday, June 2, 2015 by charles

physics
Mechanical energy is the difference between the kinetic and potential energies of an object. true or false?
Tuesday, June 2, 2015 by Anonymous

Physics
Vector C has a magnitude 25.8 m and is in the direction of the negative y-axis. Vectors A and B are at angles α = 41.9° and β = 25.2° up from the x-axis respectively. If the vector sum A B C = 0, what are the magnitudes of A and B?
Tuesday, June 2, 2015 by Mark

physics
The distance between the midpoints of two metal balls,P and Q,respectively of masses 55 kg and 70 kg,is 80 cm (a)calculate the gravitational force that P exerts on Q thanks in advance
Tuesday, June 2, 2015 by happy

physics
A blob of mass 5 kg is place on a table top.it is attached to a mass piece of 2kg by a light string that passes over a frictionless pulley.the table top exerts a frictional force of 7 N on the block (a) calculate the accelation of the system
Tuesday, June 2, 2015 by lesedi

physics
A 100 g aluminum calorimeter contains 200g of water at 15 degrees Celsius. If 100 g of lead at 50 degrees Celsius and 60 g of copper at 60 degrees Celsius are placed in the calorimeter, what is the final temperature in the calorimeter?
Tuesday, June 2, 2015 by Saad

Physics
An olympic hurdler is in a race. He is running at 10 m/s and jumps over a hurdle. How high did he jump if he was moving at 1m/s as he crossed the fence?
Tuesday, June 2, 2015 by Aleisha

Physics
A 5kg package is lifted vertically through 10m at constant speed. What is the potential energy of the package if acceleration due to gravity is 10m5 to power negative 2
Tuesday, June 2, 2015 by Annah

physics
A block of 25 is pulled horizontally on a rough surface by the force 120N.the coefficient of friction between the surface is 0.34 how do i calculate the accelation of the block
Tuesday, June 2, 2015 by kem

Physics
I want to lift a 90kg box using an inclined plane, but I only have 30kg of strength. What does the length and height of the inclined plane need to be?
Tuesday, June 2, 2015 by Sammy

physics
Two disks are rotating about the same axis. Disk A has a moment of inertia of 3.6 kg · m2 and an angular velocity of +7.9 rad/s. Disk B is rotating with an angular velocity of -10.6 rad/s. The two disks are then linked together without the aid of any external torques, ...
Tuesday, June 2, 2015 by Anonymous

Honors Physics
Emily makes 0.250 kg of hot tea at 99.0°C. How much ice at 0.00°C must she add to the tea so that the mixture reaches a final temp. of 8.00°C? (You may treat the tea as if its water.) My work: (0.25)(4186)(91) + m(4186)(-8)(3.35 ×10^5)=0 My answer: 0.316 It ...
Monday, June 1, 2015 by Physics

Physics
A plane is flying horizontally with speed 215 m/s at a height 2770 m above the ground, when a package is dropped from the plane. The acceleration of gravity is 9.8 m/s^2. Neglecting air resistance, when the package hits the ground, the plane will be _________. Can anyone ...
Monday, June 1, 2015 by Jess

physics
is electric force between two charges greater than the gravitational force between them ?
Monday, June 1, 2015 by Anonymous

Physics
An automobile spring extends 0.2 m for 5000 N load.The ratio of potential energy stored in this spring when it has been compressed by 0.2 m to the potential energy stored in 10 microF capacitor at a potential difference of 10000 v Will be 1-1/4 2-1 3-1/2 4-2
Monday, June 1, 2015 by Abhishek

physics
car moving on a straight road covers a distance of 1.5 km due east in 150 second.what is the speed of the car?what is it's velocity?
Monday, June 1, 2015 by rahul

Physics
A 5 ohm resistor a 15 ohm resistor and a unknown resistor, r, are connected as shown with a 15 volt source. The ammeter reads a current of 0.5 ampere. I got .1V by using ohm's law but I'm not sure if it's right
Sunday, May 31, 2015 by Mika

physics
An inverted image is magnified by 2 when object is placed 22 cm in front of a concave mirror. Determine the image distance and focal length of the mirror.
Sunday, May 31, 2015 by sakura

Physics
If the relative density of a metal is 19 what will be the mass of 20cm^3 of the metal when immersed in water.
Sunday, May 31, 2015 by Inioluwa

Physics
If the relative density of a metal is 19 what will be the mass of the metal when immersed in water.
Sunday, May 31, 2015 by Inioluwa

Physics
The mass of a stone is 15.0g when completely immersed in water and 10.0 when completely immersed in a liquid of relative density 2.0 what is the mass of the stone in air.
Sunday, May 31, 2015 by Inioluwa

physics
If the relative density of a metal is 19. What will be the mass of 20cm of the metal when immersed in water RD=19 Mass=20cm³
Sunday, May 31, 2015 by Eniola

Physics
A massive steel cable drags a 20kg block across a horizontal, frictionless surface. A 100N force applied to the cable causes the block to reach a speed of 4.2m/s in a distance of 2.1m . What is the mass of the cable?
Saturday, May 30, 2015 by Eric

Physics
A lead bullet of mass 50 grams is fired with a velocity of 200m/s into a lead block of mass 950 grams. Given that the lead block can move freely, calculate the kinetic energy after impact and the loss of energy.
Saturday, May 30, 2015 by Williams

Physics
Two point charges of magnitude 2.0 X 10^-7 C and 85 X 10^-8 C are placed 12 cm apart .What is the field intensity of each charge at the site of other ?
Saturday, May 30, 2015 by Prashant

physics
a bike is moving with a speed of 12m/s in west direction and rain is falling with a speed of 35m/s then at what angle an umbrella must be placed so that rain does not fall on person
Saturday, May 30, 2015 by Anonymous

physics eduction
a spring 20cm long is stretched to 25cm by a load of 50N. what will be its lenght when stretched by 100N assuming that the elastic limit is not reached
Thursday, May 28, 2015 by Anonymous

PHYSICS
a spring 20cm long is stretched to 25cm by a load of 50N. what will be its length when stretched by 100N assuming that the elastic limit is not reached
Thursday, May 28, 2015 by alade samuel

Physics
A person whose mass is m = 96.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 15.3° with the horizontal. What is the reading on the scale?
Thursday, May 28, 2015 by Scott

physics
two forces act on an object, force A id 8.7N and force B is 12.9N. The angle between the two forces is 125 degrees. what is the net force on the object?
Thursday, May 28, 2015 by george

physics
Please help! I want to make sure my answer is correct. Q:A thundercloud has an electric charge of 43.2 C near the top of the cloud and -38.7 near the bottom of the cloud. The magnitude of the electric force between these two charges is 3.95 x 10^6 N. What is the average ...
Thursday, May 28, 2015 by Ashley

physics
A stationary pool ball with mass 0.20 kg is struck with an average force of 35 N over a time of 18 ms. What speed does it have just after impact?
Wednesday, May 27, 2015 by andrew

Physics
In deep space, a 636 kg space probe, travels with an initial velocity of 19 m/s. Retro-rockets fire, producing a 212 N force in the opposite direction of the probe's initial velocity. How many seconds until the probe has a velocity of 22 m/s in the opposite direction of ...
Wednesday, May 27, 2015 by Emma

Science (Physics)
A 33.3 kg cyclist is riding a 10.7 kg bicycle at a velocity of 7.0 m/s. If the cyclist applies a brake that applies a force of 42.7 N, what is the time required for the cyclist to come to a stop?
Wednesday, May 27, 2015 by Jazmin

physics
Diver jumps from a 10 m platform. Air time is 2.3 s. Horizontal displacement of the divers center of mass i 4 m. What is the divers initial velocity and initial angle?
Wednesday, May 27, 2015 by anders

physics
Diver jumps from a 10 m platform. Air time is 2.3 s. Horizontal displacement of the divers center of mass i 4 m. What is the divers initial velocity and initial angle?
Wednesday, May 27, 2015 by anders

Physics
In deep space, a 636 kg space probe, travels with an initial velocity of 19 m/s. Retro-rockets fire, producing a 212 N force in the opposite direction of the probe's initial velocity. How many seconds until the probe has a velocity of 22 m/s in the opposite direction of ...
Tuesday, May 26, 2015 by Emma

Physics
In deep space, a small rock orbits an asteroid. The circular, orbit radius is 1037m and the velocity of the rock is 8.02m/s. Find the mass of the asteroid.
Tuesday, May 26, 2015 by Jenny

Physics
On a flat golf course, a golf ball lies 12m from the base of a lamp post. A golfer hits the ball with a club, giving the golf ball an initial velocity of 18 m/s. At 2.9 seconds, after being hit, the golf ball strikes the top of the lamp post. How high (m) is the lamp post?
Tuesday, May 26, 2015 by Alex

Physics
A mass slides down a smooth incline, the normal force is exactly 1/3 the weight of the mass. Find the angle of the incline, relative to the horizontal.
Tuesday, May 26, 2015 by Tara

physics
If the electric field strength in air is more than 3x106 N/C then the air will be become agood conductor .Determine the amount of charge that can be carried by a metal sphere of radius 2.0 m
Tuesday, May 26, 2015 by khan

physics
How many joules of energy are required to melt 80g of silver.
Tuesday, May 26, 2015 by tharol simi

physics
At what height above the ground must a body of mass 10kg be situated in order to have potential energy in value to the kinetic energy possessed by another body of mass 10kg moving with a velocity of 10m-s
Monday, May 25, 2015 by sarah

Physics
A car drives over a hump in the road. The radius of the (circular) hump is 45m. How fast (m/s) would the car need to travel, so that the wheels just barely lose contact with the road?
Monday, May 25, 2015 by Kaitlyn

Physics
A person struggles to read by holding a book at arms length, a distance of 50.0 cm. What power of reading glasses should be prescribed for him, assuming they will be placed 2.0 cm from the eye and he wanted to read at normal near point of 25.0 cm?
Monday, May 25, 2015 by Anonymous

physics
A body A of mass 2.0kg makes an elastic collision with another body B at rest. After collision,A continues to move in the original direction but with one-fourth of its original speed. Determine the value of mass B
Monday, May 25, 2015 by Angelika Nnaji

Physics/Dynamics
A truck has wheels of diameter 0.9m, a weight of 8000kg, a wheel-base of 4m, and a tray height of approximately 1.2m. The truck’s weight distribution is 50% on the rear wheels and 50% on the front wheels. The truck’s front springs have a combined stiffness of 550,000...
Monday, May 25, 2015 by Brett

Physics
In deep space, a small rock orbits an asteroid. The circular, orbit radius (between their center of masses) is 1037 m and the velocity of the rock is 8.02 m/s. Find the mass (kg) of the asteroid. G=6.67x10^-11 m^3/kgs^2. I got 1.0x10^15 but that is incorrect.
Sunday, May 24, 2015 by Sansa Stark

Physics
Vectors A and B are added to produce C, that is A+B=C. If B=-5x+5y and C=2x-3y. Find the unit vector of A, that is find A (in component form).
Sunday, May 24, 2015 by Tara

Physics
A wire of length 5.0 m and diameter 2.0 mm extends by 0.25 mm when a force of 50 N was used to stretch it from its end. Calculate the (a)stress on the wire (b)strain in the wire
Sunday, May 24, 2015 by Saka

Physics
A spring is compressed by 3cm.calculate the energy stored in the spring,if its force constant is 300Nm
Sunday, May 24, 2015 by Saka

physics
14,0 of KOH is neutralised in 1dm^3 of water by sulphuric acid with a concentration at 0,1 mol dm^-3 how do i calculate it
Sunday, May 24, 2015 by happy

Physics
A fullback preparing to carry the football starts from rest and accelerates straight ahead. He is handed the ball just before he reaches the line of scrimmage. Assume that the fullback accelerates uniformly (even during the handoff), reaching the line with a velocity of 7.96 m...
Sunday, May 24, 2015 by Stacie

Physics
A car speeds, at a constant 16 m/s, past a parked police motorcycle. Five seconds later, the police officer leaves on her motorcycle, and accelerates at 2 m/s2. How many seconds until she catches the car?
Saturday, May 23, 2015 by Tara

Physics
At a constant velocity, a 5kg bag of cement is pulled straight up a 7m wall. How much work is done by the puller? (Gravitational pull is 9.8m/s2, W(J)=F(N)*D(m) How do I work this problem??
Saturday, May 23, 2015 by Laura

physics
What is the value of current when charge of 5 uc paases through a conductor in 2seconds
Friday, May 22, 2015 by neha

advanced physics
A toy roller coaster contains a loop of radiusR. A toy train, which consistsof a lot of small waggons is moving towards the loop with constant velocity. The lengthof the train isL >2Rπ, and the radius of the loop is much larger than the height of thewaggons. The ...
Friday, May 22, 2015 by michel

physics
is differentials used in burger's equation?
Friday, May 22, 2015 by Anonymous

physics
is differentials used in burger's equation?
Friday, May 22, 2015 by Anonymous

physics
a shell is fired at an angle of 30 C above the horizontal at a velocity of 140 m/s
Friday, May 22, 2015 by Bekzod

physics
a body travelling along a straight line travels one half of the total distance with the velocity V0.The remaining part of the distance was covered with the velocity of V1 for half of the time and with velocity V2 for other half of time. Find average velocity of the body.
Friday, May 22, 2015 by samarth

physics
a cell of emf 10v and internal resistance 2ohms is connected in series with an ammeter resistance 0.5ohms and a load of resistance 7ohms. Calculate (A) the potential difference across its terminal (B)the voltage drop
Thursday, May 21, 2015 by benjamin

Physics
A small aircraft A is about to land with an airspeed of 80 mi/hr. If the aircraft is encountering a steady side wind of speed 10 mi/hr, what angle (alpha) should the pilot direct the aircraft so the the absolute velocity is parallel to the runway? What is the speed at touchdown?
Thursday, May 21, 2015 by Wade

Physics
An object is placed 20.0 cm to the left of a convex lens with a focal length of +8.0 cm. Where is the image of the object? A)28 cm to the right of the lens B)13 cm to the left of the lens C)13 cm to the right of the lens
Thursday, May 21, 2015 by Alex

Physics
An object is placed 20.0 cm to the left of a convex lens with a focal length of +8.0 cm. Where is the image of the object? A)28 cm to the right of the lens B)13 cm to the left of the lens C)13 cm to the right of the lens I think its A but I'm not sure
Thursday, May 21, 2015 by jasmine

physics
A bullet is fired through a wooden board with a thickness of 10.0 cm. The bullet hits the board perpendicular to it, and with a speed of +390 m/s. The bullet then emerges on the other side of the board with a speed of +234 m/s. Assuming constant acceleration (rather, ...
Thursday, May 21, 2015 by sandy

Physics
Three charged particles are arranged on corners of a square as shown in the figure below, with charge -Q on both the particle at the upper left corner and the particle on the lower right corner, and charge +2Q on the particle at the lower left corner. (i) What is the direction...
Thursday, May 21, 2015 by Anonymous

physics
If an object is thrown in an upward direction from the top of a building 160 ft high at an initial speed of 30 mi/h, what is its final speed when it hits the ground
Thursday, May 21, 2015 by paul

physics
you walk west for 52 m, then you walk 33.2° north of west for 44 m, and finally you walk due north for 25 m. Find the components of your final displacement, from your initial to final point, along the north and west directions.
Thursday, May 21, 2015 by gloria

physics
a ball of mass m is thrown vertically upwards with Vo= 10j m/s. Study nature of motion
Thursday, May 21, 2015 by Sara

physics
A resistor is connected inseries
Thursday, May 21, 2015 by Jen

physics
solid gold statue with mass of 7.55kg, weight of 74.0N, and disperses 680 cubic meters of water when immersed. i need to find the density. but im unsure how to find the volume first to put it into the formula?
Thursday, May 21, 2015 by christy

PHYSICS
The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature of the gas are, ...
Wednesday, May 20, 2015 by Anonymous

physics
A plane flies at 20.0m/s ascending at 30 degrees above the horizontal. The plane drops a care package at a height that allows the package to land 750m away (horizontally). 1.) At what location above the ground was the package released? 2.) Find the velocity (magnitude and ...
Wednesday, May 20, 2015 by Anonymous

Physics
Two tuning forks are struck at the same time; one with a pitch of 410Hz one a frequency of 500Hz. How many pitches do you hear and what are the frequencies?
Wednesday, May 20, 2015 by Maddy

PHYSICS
The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature of the gas are, ...
Wednesday, May 20, 2015 by Anonymous

PHYSICS
Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C. I am stuck on trying to figure out how to solve this. Please help!
Wednesday, May 20, 2015 by KS

physics
A skier stands on a 5 degree slope.if the cofficient of static friction is 0.1,does the skier start to slide down?
Wednesday, May 20, 2015 by Anonymous

PHYSICS
Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.
Wednesday, May 20, 2015 by KS

physics
750km towards North West?
Wednesday, May 20, 2015 by sana

PHYSICS
A Goodyear blimp typically contains 5040 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the helium is 282 K. What is the mass (in kg) of the helium in the blimp?
Wednesday, May 20, 2015 by KS

PHYSICS
The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature of the gas are, ...
Wednesday, May 20, 2015 by KS

PHYSICS
A thermos contains 152 cm3 of coffee at 93.8 °C. To cool the coffee, you drop two 11.6-g ice cubes into the thermos. The ice cubes are initially at 0 °C and melt completely. What is the final temperature of the coffee in degrees Celsius? Treat the coffee as if it were ...
Wednesday, May 20, 2015 by KS

physics
What is current?
Wednesday, May 20, 2015 by meenakshi

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