Thursday

September 3, 2015
**Physics**

A rowboat is heading across a river at 2.4 m/s east. The current of the river is 1.7 m/s south. What is the rowboat's resultant velocity?
*Monday, June 15, 2015 by Kathy*

**Physics**

A body moved on x-axis at time t secs, the displacement of the particle from the origin is x-metre and the velocity of the particle is vm/s when t=0, s=0 and v=0. 1) given that the particle moves at a constant acceleration and that v=1 when t=4, find a)the value of ...
*Monday, June 15, 2015 by clement*

**physics**

A jetliner is traveling east from Seattle to Chicago, a distance of 1,750 miles. The jetliner travels at an average air speed of 620 mph relative to the air. At the jetliner's altitude, the wind is blowing 46 mph to the east. How long does the journey take?
*Monday, June 15, 2015 by alex*

**Physics**

The Golden Gate Bridge in San Francisco has a main span of length 1.28 km, one of the longest in the world. Imagine that a steel wire with this length and a cross-sectional area of 4.00 x 10-6 m^2 is laid on the bridge deck with its ends attached to the towers of the bridge, ...
*Monday, June 15, 2015 by Anna*

**physics**

An astronaut in a spacecraft looks out her window and observes a comet travel in the opposite direction at a relative speed of 237 m/s. The velocity of the spacecraft is 114 m/s directly away from the sun. What is the comet's velocity relative to the sun? Assume that ...
*Monday, June 15, 2015 by alex*

**physics**

A stone is thrown vertically upwards, reaches a highest point, and returns to the ground. When the stone is at the top of its path, its acceleration
*Monday, June 15, 2015 by alex*

**physics**

Hot air balloon A is rising upward a rate of 5.0 m/s. A passenger aboard balloon A observes balloon B rising upward at a relative rate of 7.5 m/s. What is the velocity of balloon B relative to the ground? Assume that up is positive.
*Monday, June 15, 2015 by alex*

**physics**

A test rocket is fired straight up from rest. The net acceleration is 20 m/s2 upward and continues for 4.0 seconds, at which time the rocket engines cease firing. What maximum elevation does the rocket reach?
*Monday, June 15, 2015 by alex*

**physics**

a man goes 10m towards north,then 20m towards east then displacement is what
*Monday, June 15, 2015 by sajid*

**Physics**

Find x and y components of a vector which is 10 units in length and 40 degrees below the +x axis. I honestly don't even know how to begin this problem .. Please help me !
*Monday, June 15, 2015 by Sasha*

**physics**

If R is the range for an angle of projectin 0f 15¤ wd the horizntl ' then the 0thr angle of projection for which the range is R 'is
*Monday, June 15, 2015 by dani*

**Physics **

What is the significance in the observation of discrete spectral lines in the emission spectrum of hydrogen??
*Monday, June 15, 2015 by Anna*

**physics**

A steel section of the Alaskan pipeline had a length of 58.5 m and a temperature of 18.0 °C when it was installed. What is its change in length when the temperature drops to a frigid -37.7 °C?
*Sunday, June 14, 2015 by ashley*

**physics**

The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 29.0 °C the air gap between the rods is 1.93 x 10-3 m. At what temperature will the gap be closed?
*Sunday, June 14, 2015 by ashley*

**physics**

A copper kettle contains water at 29.1 °C. When the water is heated to 86.6 °C, the volume of the kettle expands by 5.56 x 10-5 m3. Determine the volume of the kettle at 29.1 °C.
*Sunday, June 14, 2015 by ashley*

**physics**

Ideally, when a thermometer is used to measure the temperature of an object, the temperature of the object itself should not change. However, if a significant amount of heat flows from the object to the thermometer, the temperature will change. A thermometer has a mass of 31.8...
*Sunday, June 14, 2015 by ashley*

**physics**

An ice chest at a beach party contains 12 cans of soda at 4.56 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 6.54-kg watermelon at 28.5 °C to the chest. The specific heat capacity of watermelon is nearly ...
*Sunday, June 14, 2015 by ashley*

**physics**

Two bars of identical mass are at 29 °C. One is made from glass and the other from another substance. The specific heat capacity of glass is 840 J/(kg · C°). When identical amounts of heat are supplied to each, the glass bar reaches a temperature of 92 °C, ...
*Sunday, June 14, 2015 by ashley*

**physics**

How much heat in joules must be added to 0.413 kg of aluminum to change it from a solid at 122 °C to a liquid at 660 °C (its melting point)? The latent heat of fusion for aluminum is 4.0 x 105 J/kg.
*Sunday, June 14, 2015 by ashley*

**physics**

A thick, vertical iron pipe has an inner diameter of 0.070 m. A thin aluminum (α = 23x10-6 (C°)-1) disk, heated to a temperature of 89°C, has a diameter that is 4.4x10-5 m greater than the pipe's inner diameter. The disk is laid on top of the open upper end of...
*Sunday, June 14, 2015 by ashley*

**physics**

A cart with a mass is of 6 kg rolls across a level surface. The wheels on the cart make the effects of friction negligible. A force of 3.0 N is applied to the cart, describe the carts motion.
*Sunday, June 14, 2015 by chuck*

**physics**

A point charge 5 micro couloumb is at the centre of a cubical gaussian surface 100cm on edge. Calculate the electric flux through the surface.
*Sunday, June 14, 2015 by clement*

**physics**

Compute the electric field about a uniformly charged plane sheet using gauss law.
*Sunday, June 14, 2015 by clement*

**physics**

You have four point charges 2q, q, -q and -2q. If possible, describe how you would place at least the charge 2q (and perhaps other charges) and through which the net electric flux is a) 0 b) +3q/£0 c) -2q/£0
*Sunday, June 14, 2015 by clement*

**physics**

A car moves with constant velocity along a straight road. Its position is x1 = 0 m at t1 = 0 s and is x2 = 48m at t2 = 5.0s . Answer the following by considering ratios, without computing the car's velocity. What is the car's position at t = 2.5s ? What will be its ...
*Friday, June 12, 2015 by Tommy*

**Physics**

In a 5.00km race, one runner runs at a steady 11.6km/h and another runs at 15.0km/h. How long does the faster runner have to wait at the finish line to see the slower runner cross?
*Friday, June 12, 2015 by Tommy*

**Physics**

A grasshopper leaps into the air from the edge of a cliff at a 50 degree angle. He reaches a maximum height 6.74 cm above the top of the cliff and travels a total horizontal distance of 1.06 m. How tall is the cliff and what is the initial speed of the grasshopper?
*Friday, June 12, 2015 by Sarah*

**Physics**

A grasshopper leaps into the air from the edge of a cliff at a 50 degree angle. He reaches a maximum height 6.74 cm above the top of the cliff and travels a total horizontal distance of 1.06 m. 1) How tall is the cliff? 2) What is the initial speed of the grasshopper?
*Friday, June 12, 2015 by Elliot*

**Physics**

A rookie quarterback throws a football with an initial upward velocity component of 15.4m/s and a horizontal velocity component of 19.5m/s . Ignore air resistance. What is the equation for this graph and how do I find it?
*Friday, June 12, 2015 by Rebekha*

**Physics**

A daring 510-N swimmer dives off a cliff with a running horizontal leap. What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is 1.75 m wide and 9.00 m below the top of the cliff?
*Friday, June 12, 2015 by Louis*

**Physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.24 m/s. The car is a distance d away. The bear is 31.1 m behind the tourist and running at 4.50 m/s. The tourist reaches the car safely. What is the maximum possible value for d?
*Friday, June 12, 2015 by Beth*

**Physics - Dynamics**

(ZYX)If the coefficient of friction is 0.85 for a 2500 kg car against asphalt, then what applied horizontal friction force would be necessary to decelerate the car at 6.0 m/s^2? Also, what would be the stopping distance if the vehicles original speed is 25 m/s?
*Friday, June 12, 2015 by Nathan*

**unique national comprehensive college**

Physics: an elastic cord can be stretched to its elastic limit by a load of 2N.if a 35cm length of the cord is extended 0.6cm by force of 0.5N,what will be the length of the cord when the stretching force is 2.5N?
*Friday, June 12, 2015 by precious *

**physics**

A river has a steady speed of 0.470 m/s. A student swims upstream a distance of 1.00 km and swims back to the starting point
*Thursday, June 11, 2015 by Bishop's High*

**physics**

If the force of the explosion was focused onto a smaller ___________ of the window, then the pressure of the explosion on the window would be even greater.
*Thursday, June 11, 2015 by kim*

**physics**

The pressure in the room also increased when the temperature increased, because pressure is ___________ to temperature.
*Thursday, June 11, 2015 by maya*

**physics**

an artlillery shell is fired with an initial velocity of 325 m/s at 55 degree above the horizontal.It explodes on a mountainside 42 sec after firing.What are the x and y coordinates of the shell where it explodes,relative to its firing point? heres what I got t=325(sin55)/9.8=...
*Thursday, June 11, 2015 by blue28*

**physics**

An object is dropped from a bridge.A second object is thrown downwards 2.00s later.They both reach the water 35.0m below at the same instant.What is the initial speed of the second object? I will be very grateful if someone could help me out Heres what I have so far d=1/2(at^2...
*Thursday, June 11, 2015 by cobalt*

**Physics**

A football is kicked at an angle of 60 degrees above the horizontal. To make the field goal it must reach a height of at least 3.048 m above the ground. What is the minimum speed the ball can be kick in order make a field goal?
*Thursday, June 11, 2015 by cooper*

**physics**

A 3 kg book is lifted 5 meters above the floor for 250 seconds. What is the work done?
*Thursday, June 11, 2015 by abby*

**physics**

3) A football is kicked at an angle of 60 degrees above the horizontal. To make the field goal it must reach a height of at least 3.048 m above the ground. What is the minimum speed the ball can be kick in order make a field goal?
*Thursday, June 11, 2015 by cooper*

**physics**

2) A diving platform or diving tower has three platforms at 10 m, 7.5 m, and 5.0 m. Some students are going to drop or throw straight down identical balls from each platform and they want the balls to reach the water with the same velocity. The ball from the highest platform ...
*Thursday, June 11, 2015 by julio*

**physics**

When a driver presses the brake pedal, his car stops with an acceleration of -8.7 m/s2. How far will the car travel while coming to a complete stop if its initial speed was 10 m/s?
*Thursday, June 11, 2015 by Jojo *

**Physics**

A projectile is fired straight up from the top of a 190m cliff with a speed of 170m/s . What will be its speed just before it strikes the ground below? (Use conservation of energy and neglect air resistance.)
*Thursday, June 11, 2015 by Ali*

**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*