Sunday
July 5, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
7. Consider the 52.0-kg mountain climber in Figure 5.22. (a) Find the tension in the rope and the force that the mountain climber must exert with her feet on the vertical rock face to remain stationary. Assume that the force is exerted parallel to her legs. Also, assume ...
Thursday, June 11, 2015 by pari

Physics
What is the tension in a 1-meter string that is spinning a 0.5-kg rock in a horizontal circle 3 times per second?
Wednesday, June 10, 2015 by Anonymous

Physics
A converging lens has a virtual object located a finite distance away. Which of the following must be true? (Select all that apply.) a) f > q b) The image is virtual. c) p < 0 d) The image is real. e) p > 0 Hi, can someone explain which is correct or incorrect? Thank ...
Wednesday, June 10, 2015 by Anna

physics
If the building absorbed so much heat that it turned into a liquid, then it would have undergone a phase change known as _________.
Wednesday, June 10, 2015 by neel

physics
A marble is flicked horizontally off a desk with a speed of 3.1 m/s. If it takes the marble 0.8 seconds to hit the ground, how far from the desk does it land?
Wednesday, June 10, 2015 by Jojo

Physics
A box slides along a rough floor with initial kinetic energy of 7 J. A person pushes on the box, in the same direction as its velocity doing 25 J of work. The velocity of the box is doubled. Find the magnitude of the work done by friction.
Wednesday, June 10, 2015 by James

aplied physics
two charges q1=-2uc and q2=3uc are placed at a distance of 6cm from each other. if rubber (Er=2.94) is placed between charges, find magnitude of electric force between charges.
Wednesday, June 10, 2015 by zeeshan

Physics 11th
, a ball is thrown vertically upward from the top of the tower at 4.9 metres per second it strikes the pond near the base of the towers after 3 seconds the height of the tower is. Pls reply...
Wednesday, June 10, 2015 by Genius

Urgent - physics
Air molecules and dust particles in the atmosphere will scatter sunlight. From a consideration of the position of the sun, estimate the direction of incidence of the sun's rays on the atmosphere. In what direction will an observer on the earth's surface need to look if...
Wednesday, June 10, 2015 by Nick

physics
How would you use a piece of Polaroid to look at the bottom of a pond if reflections are a problem? Would it be any different if the pond is covered with a layer of oil? Hint: (Refractive index of water = 1.33 and of oil = 1.5). Show calculations.
Wednesday, June 10, 2015 by Nick

Physics
A race car travels on a flat circular track at the maximum possible speed without slipping. If the radius of the track is 39m and the coefficient of friction is 0.73, how long (seconds) does it take the race car to complete 5 laps?
Tuesday, June 9, 2015 by Alex

physics
Using a rope, a child pulls a box across a rough floor at a constant speed. The tension in the rope is 105 N and the rope makes an angle of 37 degrees with the horizontal. Find the friction force acting on the box (due to the rough floor).
Tuesday, June 9, 2015 by tara

Physics
A pistol is fired horizontally toward a target 120 m away but at the same height. The bullet's velocity is 200 m/s. How long does it take the bullet to get to the target? How far below the target does the bullet hit? please explain why you used the formula and how you got ...
Tuesday, June 9, 2015 by Mark

physics
indicate the direction and select the total displacement of A caterpillar tries to climb straight up a wall two meters high, but for every 2 cm up it climbs, it slides down 1 cm. Eventually, it reaches the top. When it reaches the top, it does not pull itself over so it will ...
Tuesday, June 9, 2015 by Jorge Alaniz

physics
a car travels at uniform velocity of 20m/s for 5 seconds, the breaks are then applied and the car comes to rest with uniform retardation in further 8 seconds. draw a graph of velocity against time.How far does the car travel after the breaks are applied.?
Tuesday, June 9, 2015 by emmanuel

Physics
A tyre is suddenly brust when it was pumped to a presure of 4 atm at 20 degree celsius. Calculate the final temperature.
Tuesday, June 9, 2015 by Zorgo

Physics
An automobile and a truck start from rest at the same instant, with the automobile initially at some distance behind the truck. The truck has a constant acceleration of 2.15m/s2 , and the automobile an acceleration of 3.47m/s2 . The automobile overtakes the truck after the ...
Monday, June 8, 2015 by David

Physics
A small rock is thrown vertically upward with a speed of 17.0m/s from the edge of the roof of a 22.0m tall building. The rock doesn't hit the building on its way back down and lands in the street below. Air resistance can be neglected. 1. what is the speed of the rock just...
Monday, June 8, 2015 by Lisa

Physics
The position of the front bumper of a test car under microprocessor control is given by x(t)=2.17m+(4.80m/s2)t2−(0.100m/s6​)t6. Find it's acceleration the second instant when the car has zero velocity. I already know that the position of the car when it has ...
Monday, June 8, 2015 by Lost

Physics
A Honda Civic travels in a straight line along a road. Its distance x from a stop sign is given as a function of time t by the equation x(t)= α t2− β t3, where α = 1.40m/s2 and β = 5.05×10−2m/s3 A) What is the average velocity of the car ...
Monday, June 8, 2015 by Hopeless

physics
A man wished to travel due north in order to cross river 5kilometer wide flowing due east at 2kilometer per hour. If he can roll at 9kilometer per hour in still water, find 1. The direction in which he must head his boat in order to get to his destination directly opposite to ...
Monday, June 8, 2015 by ayomide

physics
Two forces P and Q whose resultant is 10Newtons are at right angles to each other. If P makes 30 degrees with the resultant, determine the magnitude of Q in Newton.
Monday, June 8, 2015 by ayomide

Physics
A pair of speakers separated by distance d = 0.900 m are driven by the same oscillator at a frequency of 670 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers as in the figure below. (a) How ...
Monday, June 8, 2015 by Anna

Physics
A pair of speakers separated by distance d = 0.900 m are driven by the same oscillator at a frequency of 670 Hz. An observer originally positioned at one of the speakers begins to walk along a line perpendicular to the line joining the speakers as in the figure below. (a) How ...
Monday, June 8, 2015 by Anna

physics
A 2.0ìF capacitor, a 13ìF capacitor, and a 20ìF capacitor are connected in parallel. What is their equivalent capacitance? Could you explain how to do?
Sunday, June 7, 2015 by skip

Physics
You and your friend are sledding on two sides of a triangle-shaped hill. On your side, the hill slopes up at 30.0° from the horizontal; on your friend's side, it slopes down at the same angle. You do not want to climb up the hill, so you tell your friend to thread a ...
Sunday, June 7, 2015 by Average

Physics
You and your friend are sledding on two sides of a triangle-shaped hill. On your side, the hill slopes up at 30.0° from the horizontal; on your friend's side, it slopes down at the same angle. You do not want to climb up the hill, so you tell your friend to thread a ...
Sunday, June 7, 2015 by Nguyen Ha

Math/Physics
Given the following vectors, where Vector A is 6.3 meters and Vector B is 3.5 meters, determine the magnitude of the following vector sums: A+B, A-B, B-A I tried to do magnitude such as A+B = square root (6.3)^2+(3.5)^2 = 7.2 then A-B = square root (6.3)^2-(3.5)^2 = 5.2 then ...
Saturday, June 6, 2015 by John

Physics
A stone is shot upward with a speed of 24.4 m/s from a tower and lands at the base of the tower with a speed of 44.0 m/s. How long does it take?
Saturday, June 6, 2015 by Mark

physics
A stationary motion detector sends sound waves of frequency 0.0953 MHz toward a truck approaching at a speed of 42.6 m/s. What is the frequency of the waves reflected back to the detector? (Take the speed of sound to be 343 m/s.)
Friday, June 5, 2015 by Anonymous

Physics
A physicist converted 2 kg of water at 37 degrees celcius to steam at 100 degrees celcius. Assuming no heat is lost, calculate the amount of energy needed to heat to 100 degrees celcius.
Friday, June 5, 2015 by i need help

Physics
I did a lab about Standing waves on a string and it asked me the following qeuestions: Discuss any errors arising from the method used to establish the standing wave pattern. - I think air resistance, linear density of string is non uniform, tension of the string is not ...
Friday, June 5, 2015 by Anna

Physics
3 objects with masses m1=5kg, m2=10kg and m3=15kg are attached by massless string over two frictionless pulleys. The horizontal surface is frictionless and system is released from rest. Using energy concept calculate m3 speed after it has moved down 0.4m
Friday, June 5, 2015 by Akosua

Science (Physics)
A conductor carries a current of 25 A and is at right angles to a magnetic field. The flux density is 0.8 Tesla and the length of the conductor in the field is 35 cm. Calculate the force acting on the conductor, and the value of the force if the conductor is inclined at 35 ...
Thursday, June 4, 2015 by Eren A

physics
A conductor 400mm long moves at a uniform speed of 4 m/s at a right angles to a uniform magnetic field of flux density 4.7 Tesla. Find then induce emf? F=BIL sin degrees 4.7*0.4*4*sin 90 degrees = 7.52
Thursday, June 4, 2015 by Eren A

Physics
Suppose you have a string that is being made to vibrate at a specific frequency, f. The speed of waves on the string is v. The length of the string that is vibrating, L, is adjustable. When the length of the string has been adjusted so that the fundamental standing wave ...
Thursday, June 4, 2015 by Anna

Physics
A stretched string is attached to an oscillator. On which of the following quantities does the wavelength of the waves on the string depend? Select all that apply. The choices are: A) The frequency of the oscillator. B) The tension applied to the string. C) The amplitude of ...
Thursday, June 4, 2015 by Anna

physics
a car starts from rest &moves along x axis with a constant acceleration of 5 m/s2 for 8 sec.if it then continues to move with a constant velocity,what dist will the car cover in 12 sec since it stared.
Thursday, June 4, 2015 by ashmeet

physics
A person opens a door by applying a 11-N force perpendicular to it at a distance 0.90m from the hinges. The door is pushed wide open (to 120 ∘ ) in 2.2s How much work was done? What was the average power delivered?
Wednesday, June 3, 2015 by john

physics
A crate sits on wooden horizontal surface (a wooden floor). The figure shows a top view of this looking down onto the crate (gravity would be acting into the page). Man one and man two apply forces F1 and F2, at angles of θ1 and θ2 respectively, with the goal of ...
Wednesday, June 3, 2015 by emily

physics
What experimental evidence do we have to show that matter is composed of particles
Wednesday, June 3, 2015 by Anonymous

physics
A 7.74- g bullet is moving at 578.00 m/s as it leaves the 0.64- m-long barrel of a rifle. What is the average force on the bullet as it moves down the barrel? Assume that the acceleration is constant.
Wednesday, June 3, 2015 by Anonymous

physics
What is the acceleration (in m/s^2) of a vehicle that changes its velocity from 85 km/h to a dead stop in 13 s?
Wednesday, June 3, 2015 by John

physics
A person opens a door by applying a 11-N force perpendicular to it at a distance 0.90m from the hinges. The door is pushed wide open (to 120 ∘ ) in 2.2s How much work was done? What was the average power delivered?
Wednesday, June 3, 2015 by john

PHYSICS
A constant torque of 30m⋅N is applied to the rim of a 6.0-kg uniform disk of radius 0.20m .What is the angular speed of the disk about an axis through its center after it rotates 2.0 revolutions from rest?
Wednesday, June 3, 2015 by dan

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

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