Tuesday
July 7, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
I shot two arrows into the air the first arrow had a speed of 10 m/sec , 1 second later I shot the 2nd arrow into the air with a speed of 15 m/sec. Will they meet? If so, where?
Sunday, April 26, 2015 by Christian

Physics
An equal amount of heat is transferred to two containers containing water at the same temperature. If the second container contains three times as many water molecules as the first, how do the final temperatures compare?
Sunday, April 26, 2015 by Sean

Physics
A liter of water is used to cool some electronics. If 1000 J of heat is given off by the electronics, by what temperature does the water increase? One liter of water has a mass of 1 kg and a specific heat of 4.184 J/(g °C). I can not get this..please help
Sunday, April 26, 2015 by Sean

Engineering Physics 1
I shot the first arrow Into the air with a speed of 10 m/sec , 1 second later I shot the 2nd arrow into the air with a speed of 15 m/sec. Will they meet? If so, where? how do i solve this?
Sunday, April 26, 2015 by Joshua

physics
If the time period of a wave is twice its frequency. How many waves are produced in 4secs if its frequency is 2hz
Sunday, April 26, 2015 by zayeem

physics
The figure above shows a chain being held on a table with one quarter of its length hanging over the edge. Friction is negligible. The chain has length L = 24 cm and mass m = 0.012 kg. Calculate how much work is required to pull the hanging section back onto the table.
Saturday, April 25, 2015 by john

PHYSICS ANSWER CHECK
A car can brake to a stop from 60mph in 2.6 seconds. If the car has a weight of 3225 lbs, what force in Newton's acts on the car. F=ma, vt=v0+at, a=(vt-v0)/t=(0-60mph)/2.6s=-23.1m/s^2 3225 lbs=1462.84 kg thus F=1462.84kg*(-23.1m/s^2)=-63.3N
Saturday, April 25, 2015 by MJW

Physics
In an empty rubber raft the pressure is approximately constant. You push on a large air pump that pushes 1.0 L(1.0× 10^−3m3) of air into the raft. You exert a 17N force while pushing the pump handle 3.0×10^−2m . Determine the work done on the gas. If ...
Saturday, April 25, 2015 by Anonymous

PHYSICS answer check
a gun converts 200J of stored energy into kinetic energy of the 0.02kg bullet. a)What is the speed of the bullet as it leaves the gun? b)If the gun is fired straight up, how high will the bullet go? a)200J b)m*g*h= (0.02kg)(10m/s^2)=200J h=100m
Saturday, April 25, 2015 by MJW

PHYSICS answer check
A 25 gram arrow fired from a bow has a speed of 80m/s. The energy in the arrow came from work done by the bow that acted over a 1m "draw" distance. What average force acted on the arrow over this distance mass=0.025kg speed=80m/s avg force 2N
Saturday, April 25, 2015 by MJW

physics
Which of the following is the correct unit of k in the equation of a damped harmonic oscillator given as , where b is the damping factor and all the symbols have their usual meaning? 2 If s is distance and t is time, what must be the dimensions of a and b in the equation...
Saturday, April 25, 2015 by Cali franco

Physics
A 4 kg block is placed on an incline at an angle of 30 degrees. If the coefficient of static friction is 0.3 and the coefficient of kinetic friction is 0.2 what is the net force on the block?
Saturday, April 25, 2015 by Carolyn

Physics
A sports car with a very powerful engine driving on a surface with a coefficient of static friction µs = 0.8 wants to accelerate from a stop to 100 km/hr. (You may neglect air resistance.) a) What is the fastest that the car can accomplish this? b) How far will the car ...
Saturday, April 25, 2015 by ji

Science-Physics
From what height was a brick dropped if it hit the ground with a speed of 4.3 m/s?
Saturday, April 25, 2015 by Desirae

physics
A body oscillates with simple harmonic motion along the x axis. Its displacement varies with time according to the equation x =5sin πt + π 3( ). The velocity of the body at t = 1.0 s is (-8 m sec )
Saturday, April 25, 2015 by chris

Physics
The temperature of a 1 m long aluminum rod is 20° C. If the temperature is increased to 70° C, what is the length of the rod? The coefficient of linear expansion for aluminum is 16 * 10^-6 /(degrees)C Please help I can not get this.
Saturday, April 25, 2015 by Anonymous

physics
a mass of 9.6 kg is moving horizontally as a force of 2.3 N , directed at 21° below the horizontal , is exerted on it , when the speed is 7.9 m/s, what is the rate at which the force is doing work
Saturday, April 25, 2015 by riham

physics
a car moving with an initial velocity of 24m/s comes to a hault in 6s .calulate the distance travelled by the car as it comes to rest
Saturday, April 25, 2015 by aayushi

Physics Capacitance
Three uncharged capacitors, X, Y, Z, each with capacitance of 12uF each are connected A---------[X]------[Y/Z]-----------B *Y&Z is parallel to each other* A potential difference of 9.0V is applied between points A and B. Explain why when the potential difference of 9.0V is ...
Saturday, April 25, 2015 by Ariana

Physics
A car drives at a speed of 28m/s along a road parallel to a railroad track. A train traveling at 15m/s sounds a horn that vibrates at 300 Hz. If the train and car are moving toward each other, what frequency of sound is heard by a person in the car? If the train and car are ...
Saturday, April 25, 2015 by Anonymous

PHYSICS answer check
A group of 4 rail cars with a total mass of 50,000kg moves at 3m/s at a stationary locomotives that has a mass of 10,000kg. What is the speed of the whole train after the cars connect with the locomotive? F=ma 50,000kg*3m/s= 150,000kg m/s 150,000kg m/s divided by 60,000kg a= 2...
Saturday, April 25, 2015 by MJW

PHYSICS
A corvette ZR1 can brake to a stop from 60mph in 2.6 seconds. If the car has a weight of 3225 pounds, what force (in Newtons) acts on the car? a= (V^2 - V^1)/t a= (0-88ft/sec)/2.6 sec a= -10.316 m/s^2 -10.32N Is this correct?
Friday, April 24, 2015 by MJW

Physics - Vision and Optical Instruments
A camera with a 100 mm focal length lens is to be designed to focus on objects from 75 cm to 20 cm. How far must the lens move as the focus is adjusted from infinity to 75 cm? Thank you!
Friday, April 24, 2015 by Meli

PHYSICS
A 25 gram arrow fired from a bow has a speed of 80m/s. The energy in the arrow came from work done by the bow that acted over a 1m "draw" distance. What average force acted on the arrow over this distance
Friday, April 24, 2015 by MJW

Physics
Determine the first three standing wave frequencies of a 25.0-cm-long open pipe. Assume the speed of sound in air is 340 m/s. Do the same for a 25.0-cm-long closed pipe.
Friday, April 24, 2015 by Anonymous

Physics
You are training for a marathon. While training, you lose energy by evaporation at a rate of 360. How much water mass do you lose while running for 3.0 h?
Friday, April 24, 2015 by Anonymous

Physics
Someone here pls help me find the best animation of electrons and protons. Post here the link of the video, thank you.
Friday, April 24, 2015 by YESHA

Physics
A small mass slides without friction across a plane an (x,y) coordinate system directly from the origin to a point with (x,y) coordinates (1.3 m, 9.6 m); a constant force acts on it. The force has magnitude 2.1 N and its direction is at a counterclockwise angle of 128o from ...
Friday, April 24, 2015 by Wack

physics 111 "2"
1 A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take 20 m/s 10 m/s 30 m/s 15 m/s 2 What is common to the variation in the range and the height of a projectile? time of flight vertical acceleration horizontal ...
Friday, April 24, 2015 by Cali franco

AP Physics
A 70 kg man stands at the back of a 3.0 meter long boat that has mass 2X kg. The front of the boat is touching a dock. The man walks to the front of the boat. How far from the dock is he? Assume there is no friction between the boat and the water.
Friday, April 24, 2015 by Burrito

physics 133
1 Which of the following is the correct unit of k in the equation of a damped harmonic oscillator given as , where b is the damping factor and all the symbols have their usual meaning? 2 If s is distance and t is time, what must be the dimensions of a and b in the equation...
Friday, April 24, 2015 by Cali franco

physics
If the current in a wire of a CD player is 1.10 mA, how long would it take for 3.40 C of charge to pass a point in this wire?
Friday, April 24, 2015 by chris

physics
A net charge of 73 mC passes through the cross-sectional area of a wire in 9 s. What is the current in the wire? The fundamental charge is 1.602 × 10−19 C.
Friday, April 24, 2015 by chris

Technical Physics
Consider a hypothetical situation, where your friend suggests leaving the refrigerator door open to help cool the house on a hot summer day. Discuss what will happen to the temperature of the room. Will it decrease, increase, or stay the same and why?
Friday, April 24, 2015 by Jennifer

physics
help pls. i need to find the best animation of the movement of electrons and protons... the best one... pls send me the link. thanks so much.
Friday, April 24, 2015 by Lucy

physics
find the no. of electron which must be removed from a conductor so that it requires a charge of 3.2 microC
Friday, April 24, 2015 by Parmesh kumar

physics
A 13 ohm, 35 ohm, and 2k ohmresistor are connected in a series circuit with a 190 V battery. What is the equivalent resistance of the circuit?
Friday, April 24, 2015 by john

physics
A 13 ohm, 35 ohm, and 2k ohmresistor are connected in a series circuit with a 190 V battery. What is the equivalent resistance of the circuit?
Friday, April 24, 2015 by Anonymous

Physics
A bowling ball (solid sphere of mass = 7.27 kg and radius = 12.7 cm) is rolling on level ground at a constant angular speed of 55 rad/s. What is the total kinetic energy of the ball?
Thursday, April 23, 2015 by Anonymous

physics
a gun converts 200J of stored energy into kinetic energy of the 0.02kg bullet. What is the speed of the bullet as it leaves the gun? If the gun is fired straight up, how high will the bullet go?
Thursday, April 23, 2015 by JJ

Physics
A remote control model airplane connected to a string is flown in a circle with a radius of 0.348 m about a fixed axis with an angular velocity of +1.47 rad/s. The plane’s throttle is increased, so that it acquires an angular acceleration of 2.18 rad/s2. After 0.490 s ...
Thursday, April 23, 2015 by Anonymous

physics
A 25 gram arrow fired from a bow has a speed of 80m/s. The energy in the arrow came from work done by the bow that acted over a 1m "draw" distance. What average force acted on the arrow over this distance?
Thursday, April 23, 2015 by JJ

physics
a gun converts 200J of stored energy into kinetic energy of the 0.02kg bullet. What is the speed of the bullet as it leaves the gun? If the gun is fired straight up, how high will the bullet go?
Thursday, April 23, 2015 by jean

Physics
A gun converts 200J of stored energy into kinetic energy of the 0.02kg bullet. What is the speed of the bullet as it leaves the gun? If the gun is fired straight up how high will the bullet go?
Thursday, April 23, 2015 by Anonymous

Physics
A car can stop from60mph in 2.5 sec. If the car has a weight of 3225 lbs what force acts on the car?
Thursday, April 23, 2015 by Anonymous

Physics
Suppose the cross sectional of the tube is 0.05 cm2, what would be the volume (a) during the lowest pressure in the experiment? (b) during the highest pressure? (c) at the atmospheric pressure?
Thursday, April 23, 2015 by Sydney

Physics
The bird perched on the swing has a mass of 48.0 g, and the base of the swing has a mass of 159 g. The swing and bird are originally at rest, and then the bird takes off horizontally at 1.20 m/s. How high will the base of the swing rise above its original level? Disregard ...
Thursday, April 23, 2015 by Dom

Physics
A bottle cork floating on water has a mass of 50g what is its weight?
Thursday, April 23, 2015 by Anabelle

Physics
An object of 3.0kg is projected into the air at a 55 degree angle. It hits the ground 3.4s later. What is it's change in momentum while it's in the air?
Thursday, April 23, 2015 by Michaela

Physics
A 3.40 kg block of copper at a temperature of 74 °C is dropped into a bucket containing a mixture of ice and water whose total mass is 1.20 kg. When thermal equilibrium is reached the temperature of the water is 14 °C. How much ice was in the bucket before the copper ...
Thursday, April 23, 2015 by Jennifer

physics
what is the acceleration in m/s2of a body moving at 63 km/h and comes to rest in 40s
Thursday, April 23, 2015 by jhanvi

physics
what is the acceleration in m/s2of a body moving at 63 km/h and comes to rest in 40s
Thursday, April 23, 2015 by aayushi

physics
A 15.0cm object is placed 60.0cm from a convex lens which has a focal lenght of 15.0cm use the thin lens equation to find the distance of the image (60)1/15=1/60+1/60(1/15)=1-1+1/d
Thursday, April 23, 2015 by maria

physics
A charge of -4.50 10-6 C is placed at a point in space where the electric field is directed toward the right and has a magnitude of 9.00 104 N/C. What are the magnitude and direction of the electrostatic force on this charge?
Thursday, April 23, 2015 by jeff

Physics
90.0g of copper (c=390J/kg*oC) at 80.0°C are added to 270g of water at 20.0°C. What is the final temperature of the mixture?
Wednesday, April 22, 2015 by Adil

Physics
Steam of mass 11.0 g at 100°C is added to 126.7 g of ice at 0.00°C. Find the final temperature of the system.
Wednesday, April 22, 2015 by Madison

Physics
How would an astronomer use index of refraction?
Wednesday, April 22, 2015 by Bri

PHYSICS
A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...
Wednesday, April 22, 2015 by KS

PHYSICS PLEASE HELP
A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...
Wednesday, April 22, 2015 by KS

Physics
A yo-yo is spun from rest by pulling on the string with a constant tension of 2.0 N. The radius of the inner rod on which the string is strung around is 0.50 cm. The tension is applied for 5.0 seconds after which the yo-yo is observed to spin with an angular velocity of 15 rad...
Wednesday, April 22, 2015 by Terry

Physics
You attach one end of a spring with a force constant k = 893 N/m to a wall and the other end to a mass m = 2.02 kg and set the mass-spring system into oscillation on a horizontal frictionless surface as shown in the figure. To put the system into oscillation, you pull the ...
Wednesday, April 22, 2015 by Kristin

physics 111
1. A monkey in a perch 20 m high in a tree drops a coconut above the head of a zoo keeper as he runs with a speed 1.5 m/s beneath the tree actually intending to hit the toes of the zoo keeper, how early in seconds should the coconut be dropped by the monkey. 2 A monkey in a ...
Wednesday, April 22, 2015 by Cali franco

physics
A rescue plane is flying horizontally at a height of 132 m above the ground. The pilot spots a survivor and releases an emergency kit with a parachute. The kit descends at a constant vertical acceleration of and the initial plane horizontal speed is . Assuming air resistance ...
Wednesday, April 22, 2015 by tr76r65

physics 111
1. A stone throw from ground level returns to the same level 4 s after. With what speed was the stone throw? Take g = 10m per square. 2. A cart is moving horizontally along a straight line with constant speed ofb30 m/s. A projectile is fired from the moving cart in such a way ...
Wednesday, April 22, 2015 by Cali franco

PHYSICS
A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...
Wednesday, April 22, 2015 by KS

physics
A balloon rubbed against denim gains a charge of −5.0 µC. What is the electric force between the balloon and the denim when the two are separated by a distance of 3.0 cm? (Assume that the charges are located at a point.) The value of the Coulomb constant is 8.98755...
Wednesday, April 22, 2015 by chris

PHYSICS
A 50.5-g golf ball is driven from the tee with an initial speed of 57.4 m/s and rises to a height of 23.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 7.97 m below its highest point?
Wednesday, April 22, 2015 by KS

Physics
Three moles of an ideal monoatomic gas are at a temperature of 345 K. Then, 2917 J of heat are added to the gas, and 1140 J of work are done on it. What is the final temperature of the gas?
Tuesday, April 21, 2015 by Adwait

PHYSICS
In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 1.43 m/s. However, this speed is inadequate to compensate for the kinetic friction between the puck and the ice. As a result, the puck travels only one-half the distance between the ...
Tuesday, April 21, 2015 by KS

Physics
A cricket ball hits the ground with kinetic energy K at an angle 30* with the vertical. What will be its kinetic energy at the highest point?
Tuesday, April 21, 2015 by Sweta sinha

Physics
A car is initailly travelling at 50.0km/h. The brakes are applied and the car stops over a 35m distance. What was magnitude of the car's acceleraion while it was braking? I don't know what formula to use.
Tuesday, April 21, 2015 by Student

physics
If the kinetic energy of an automobile triples because of a speed change, it momentum is ?
Tuesday, April 21, 2015 by titu

physics
The coil in a generator has 200 windings and a cross-sectional area of 0.0100 m^2. If the coil turns at a constant rotational speed and the magnetic field in the generator is that of Earth (B = 0.500 × 10^-4 T), how many 360 rotations must the coil complete each second ...
Tuesday, April 21, 2015 by titu

PHYSICS
a 0.30-m radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s^2 over a 3.54-s interval
Monday, April 20, 2015 by Anonymous

Physics
Three point charges lie in a straight line along the y-axis. A charge of q1 = -9.10 µC is at y = 6.70 m, and a charge of q2 = -7.70 µC is at y = -3.60 m. The net electric force on the third point charge is zero. Where is this charge located?
Monday, April 20, 2015 by Sarah

Physics
An object with a net charge of 20 µC is placed in a uniform electric field of 627 N/C, directed vertically. What is the mass of the object if it floats in the electric field?
Monday, April 20, 2015 by Joey

Physics
a 0.30-m radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s^2 over a 3.54-s interval
Monday, April 20, 2015 by Natalie

Physics
At a given instant three electrons, in vacuum, happen to lie on a straight line. The first and second are separated by 3.00x 10-6 m, while the second and third are 8.00 10-6 m apart. What is the magnitude of the net electrostatic force on the middle electron, the second one?
Monday, April 20, 2015 by Betty

PHYSICS
The drawing shows two frictionless inclines that begin at ground level (h = 0 m) and slope upward at the same angle θ. One track is longer than the other, however. Identical blocks are projected up each track with the same initial speed v0. On the longer track the block ...
Monday, April 20, 2015 by KS

physics
1. Calculate the work done on the system when 1.00 mol of gas held behind a piston expands irreversibly from volume of 1.00dm cube to a volume 10.00dm cube against an external pressure of 1.00 bar. 2. A perfect gas expand reversibly at a constant temperature of 298k so that ...
Monday, April 20, 2015 by Cali franco

physics
A 182 block is launched by compressing a spring of constant k=200N/m a distance of 15cm. The spring is mounted horizontally, and the surface directly under it is frictionless. But beyond the equilibrium position of the spring end, the surface has coefficient of friction equal...
Monday, April 20, 2015 by haji

Physics
component of a vector along the two given lines lie in the vertical downward direction making an angle 30 degree with the vertical line are 2 and 4 units.find the magnitude of the original vector and it's direction.
Monday, April 20, 2015 by Bibhraj

Physics
After you pick up a spare, your bowling ball rolls without slipping back toward the ball rack with a linear speed of = 3.18 m/s. To reach the rack, the ball rolls up a ramp that rises through a vertical distance of = 0.510 m. What is the linear speed of the ball when it ...
Monday, April 20, 2015 by Madison

Physics
A 10.4-g CD with a radius of 5.85 cm rotates with an angular speed of 33.8 rad/s. What is its kinetic energy? (in J) I need help with this question. I thought you would just use K=1/2mv^2 but when I use m=0.0104kg and v=33.8 I get 5.94 which isn't the correct answer....
Monday, April 20, 2015 by Madison

Physics
A person exerts a tangential force of 34.8 N on the rim of a disk-shaped merry-go-round of radius 2.60 m and mass 152 kg. If the merry-go-round starts at rest, what is its angular speed after the person has rotated it through an angle of 30.4°? (in rad/s)
Monday, April 20, 2015 by Madison

Physics - Dynamics
A combat jet lands on a carrier with a horizontal velocity of 50 m/s. A stopping mechanism exerts a horizontal force of Tx = 10,000 V N, V, being the velocity of the jet in m/s. The mass of the jet is 6500 Kg. a.) What is the the maximum force that the mechanism exerts on the ...
Monday, April 20, 2015 by Ronnier

Physics
A stone is catapulted at time t = 0, with an initial velocity of magnitude 18.6 m/s and at an angle of 41.6° above the horizontal. What are the magnitudes of the (a) horizontal and (b) vertical components of its displacement from the catapult site at t = 1.06 s? Repeat for...
Sunday, April 19, 2015 by Danielle

Physics
You will use the formula p*V = kB*N*T to find the depth of the box (front to back measurement). The volume of the box is given by the formula V = W * H * D. (You will need to convert the pressure from atm to Pa, or pascals, by multiplying atms by 1 * 105.) The height of the ...
Sunday, April 19, 2015 by Jennifer

physics
an object fall from rest of total height h and covers a distance of h/2 in last second find out time it remain in air
Sunday, April 19, 2015 by sham

physics
A 4.00 kg ball traveling North with a momentum of 11.2 kg.m/s collides with a 6.0 kg ball traveling West with a momentum of 18 kg.m/s. The two balls stick together and head off as one. What is the momentum of the combined masses? What is the velocity of the combined masses?
Sunday, April 19, 2015 by alexis

Physics
The white ball in the figure has a speed of 1.67 m/s and the yellow ball is at rest prior to an elastic glancing collision. After the collision the white ball has a speed of 1.43 m/s. To the nearest tenth of a degree, measured counterclockwise from east, what angle does it ...
Sunday, April 19, 2015 by Roger

Physics
(Image included with problem) 9.186E-1 moles of an ideal diatomic gas undergoes a transition from a to c along the diagonal path in the figure. The temperature of the gas at point a is 1310 K. During the transition, what is the change in internal energy of the gas? How much ...
Sunday, April 19, 2015 by Anonymous

Physics
A heat engine carries 2.60 mol of an ideal monatomic gas around the cycle shown in the figure. Process 1-2 takes place at constant volume and takes the gas from 300 K to 600 K, process 2-3 is adiabatic and takes the gas from 600 K to 455 K, and process 3-1 takes place at a ...
Sunday, April 19, 2015 by Anonymous

physics
a block weighs 200 N and is being held against a door. The coefficient of static friction between the door and the block is 0.470. What is the minimum force applied? Please show how you got it
Sunday, April 19, 2015 by billy

Physics
Let 70.0 J of heat be added to a particular ideal gas. As a result, its volume changes from 65.0 cm3 to 169.0 cm3 while the pressure remains constant at 1.7 atm. By how much did the internal energy of the gas change?
Sunday, April 19, 2015 by Shane

physics
how to determine the net electric force on q3 q3= + 10 uC distance from q3 to q2 =40 cm distance from q1 to q2 =50 cm distance from q1 to q3 = 30 cm q2 =-80 uC q1=+50 uC
Sunday, April 19, 2015 by brad

Physics
A rectangular wire loop has a 10 ohm resistor on the back as it moves into a region of uniform B=3T field at v=10m/s. The rectangle is w=5cm wide and l=20cm long. How much heat is generated in the resistor during the loop's entire path into and out of the magnetic field in...
Sunday, April 19, 2015 by Alice

Physics
Consider a spherical plastic shell with inner radius r=1cm, r2=2cm, and a dielectric constant K=4. The center is hollow. Free charge is bound within the plastic. The charge distribution is spherically symmetric but decays with radius, following a charge density:p_f=K/r where K...
Sunday, April 19, 2015 by Help

physics
A solid aluminum cylinder, ρ = 2700 kg/m3 , “weigh” 67 g in air and 45 g when immersed in turpentine. Determine the density of turpentine.
Sunday, April 19, 2015 by Doctor

Physics for Physical science
A picture frame hung against a wall is suspended by two wires attached to its upper corners. If the two wires make the same angle with the vertical. (Draw a free body diagram)
Sunday, April 19, 2015 by tina

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