Saturday
August 30, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

Post a New Question | Current Questions

Physics
What alterations could be done to make the speedometer into a velocimeter? Thanks!
Saturday, August 30, 2014 at 3:34pm

physics
A car has an initial velocity of 20 m/s to the right, 17 seconds later it is seen to be moving at 46 m/s to the left. WHAT DISTANCE DID IT TRAVEL? Does the 17 seconds include the initial 20m/s? If not, how do I find the other distance. If so... What do I do. Sorry I am in a ...
Saturday, August 30, 2014 at 3:29pm

physics
A ball is dropped into a well. A splash is heard 43 seconds later. The speed of sound (the speed at which sound travels through the air) is 345 m/s. HOW DEEP WAS THE WELL? I don't even know which equation to plug this into. At first I just tried s=d/t-> 345=d/43, but ...
Saturday, August 30, 2014 at 3:25pm

physics
A Bulldog is already moving when we first see it. It waddles -57 meters reaching a final velocity of -28 m/s after accelerating at -4 m/s2. WHAT WAS THE DOG'S INITIAL VELOCITY? Every time I try to use v^2= V0+2a(delta x) I end up getting a very big value. Could you help me...
Saturday, August 30, 2014 at 3:23pm

physics
A student tools along in his new Vette weaving in and out of slow traffic, overtaking little kids boarding the school bus, passing school zones without a second glance, cutting off ambulances and fire trucks, running yellow lights, red lights, yield signs, and stop signs ...
Saturday, August 30, 2014 at 3:22pm

physics
Suppose a 69-kg boy and a 42-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
Saturday, August 30, 2014 at 3:13pm

Physics
write a general equation describing the position at any time of an object starting from some position x0 moving with velocity v.
Saturday, August 30, 2014 at 3:11pm

Physics
The plane tectonic theory describes the motion of the continents across the face of Earth. Measurements suggest that Africa and South America were once connected and are drifting apart at an average rate of 3cm/yr. If the two continents are now 7x10^8 cm apart, how long has ...
Saturday, August 30, 2014 at 11:28am

physics
Jack drops a stone from rest off of the top of a bridge that is 24.4 m above the ground. After the stone falls 6.6 m, Jill throws a second stone straight down. Both rocks hit the water at the exact same time. What was the initial velocity of Jill's rock? Assume upward is ...
Saturday, August 30, 2014 at 11:25am

Physics Help!!!!
A runner in a relay race runs 20m north, turns around and runs south for 30 m, then turns north again and runs 40m. the entire run took 30 seconds. what was the average speed of the runner? what was the average velocity of the runner?
Saturday, August 30, 2014 at 11:24am

Physics
A forklift driver at the Acme W&W warehouse drives a forklift from the main entrance to a loading dock 20m away. He then turns back towards the entrance and drives 13m to pick up a pallet of equipment. Finally, he turns back towards the loading dock, drives 10m and deposits ...
Saturday, August 30, 2014 at 11:19am

Physics
A 0.250-kg block of a pure material is heated from 20.0°C to 65.0°C by the addition of 4.35 kJ of energy. Calculate its specific heat and identify the substance of which it is most likely composed.
Saturday, August 30, 2014 at 11:02am

physics
A 1.30kg kg box and a 3.80kg kg box on a perfectly smooth horizontal floor have a spring of force constant 300N/m N/m compressed between them. The initial compression of the spring is 5.00cm cm . Part A Find the acceleration of 1.30kg kg box the instant after they are released...
Saturday, August 30, 2014 at 9:51am

physics
A blue ball is thrown upward with an initial speed of 24.1 m/s, from a height of 0.6 meters above the ground. 2.9 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 8.5 m/s from a height of 31.8 meters above the ground. The force of ...
Saturday, August 30, 2014 at 12:19am

Physics
What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r=4.84±0.05m? I keep getting 6% and it says i am wrong.
Friday, August 29, 2014 at 9:44pm

Physics
What is the magnitude of the electric force between a proton and an electron when they are at a distance of 2.63 Angstrom from each other?
Friday, August 29, 2014 at 7:57pm

physics
an adult elephant has an average shoulder height of 350 cm and average mass of 5,7000 kg. If an elephant initially at rest was to be lifted by a cable to a height of 20 m (a) What is the tension in the cable if the elephant is accelerating upwards at rate of 1.5 m/s²? (b...
Friday, August 29, 2014 at 7:47pm

Physics
1 Angstrom = how many Coulombs?
Friday, August 29, 2014 at 7:39pm

Physics Electricity and Magnetism
A microscopic droplet of ink in an ink-jet printer is deflected onto the paper by a force of 2.34×10-4 N. If the field causing the deflection is 6.62 kN/C, what is the charge on the droplet? What equation do I use to solve and What does each value mean in the equation? ...
Friday, August 29, 2014 at 7:28pm

physics
convert 1micro A TO mA answer: 1*10^-6A *10^-3m =1*10^-9mA
Friday, August 29, 2014 at 5:50pm

Physics
Can someone please explain the method to solving the following electrostatics problem? Thank you very much. Consider three charged sheets, A,B, and C. The sheets are parallel with A above B above C. On each sheet there is a surface charge of uniform density: –4 x 10^(-5) ...
Friday, August 29, 2014 at 2:49pm

physics
a block of mass 0,5kg is attached to a spring .The spring is compressed to a distance of0,1m.The block is released .The block moves 0,07m past the equilibrium position .What is the force of friction that does work on the block. spring constant is 500
Friday, August 29, 2014 at 1:00pm

physics
a block of mass 0,5kg is attached to a spring.The spring is compressed to a distance of 0,1m .The block is released .The block moves 0.07m past the eequilibrium position .What is the force of friction that does work on the block? spring const is 500. F -kx -500 x .07
Friday, August 29, 2014 at 12:44pm

physics 12
A hollow sphere us charged to 14uc .Find the potential(a) at its surface (b) inside the sphere (c) at a distance of 0.2m from the surface.The radius of sphere is 0.3 m
Friday, August 29, 2014 at 11:58am

physics
Two positive point charges of 15 into 10^-10 C and 13 into 10^-10 C are placed 12cm apart.Find the work done in bringing the two charges 4cm closer ?
Friday, August 29, 2014 at 11:51am

Physics
Each crate moves from position 1, to position 2 to position 3. All of the crates are identical. the coordinate values given are in meters. Rank A through F in order from least to greatest, on the basis of the displacement from the position 1. If any crates traveled the same ...
Friday, August 29, 2014 at 10:57am

physics
A daredevil is shot out of a cannon at 36.5◦ to the horizontal with an initial speed of 36.1 m/s. A net is positioned a horizontal distance of 25.7 m from the cannon. At whatheight abovethecannon shouldthe net be placed in order to catch the daredevil? The acceleration ...
Thursday, August 28, 2014 at 8:48pm

Physics
Each crate moves from position 1, to position 2 to position 3. All of the crates are identical. the coordinate values given are in meters. Rank A through F in order from least to greatest, on the basis of the displacement from the position 1. If any crates traveled the same ...
Thursday, August 28, 2014 at 6:49pm

Physics ...
116In nuclei are produced at the rate of 10 s-1. Calculate the maximum number of 116In nuclei (number in equilibrium) in the sample if the half-life of 116In is 54 m. So far I have come up with ... The half life = 54m x 60 s-1 = 3.24 x 103 s-1 (In2) / λ = In2 / 3.24 x 10^...
Thursday, August 28, 2014 at 5:13pm

Physics
A constructor on worker assisting in the paving of a street drives a heavy roller back and forth over the newly paved area to smooth the asphalt. The section of street being paved is 100 m long and the roller operator drives from the east end to the west end of the street and ...
Thursday, August 28, 2014 at 4:23pm

Physics
Maria is undergoing physical therapy for a back injury. Her therapist instructs her to use the power-glide incline. When using the incline, Maria pushes with her legs, raising her torso 30 cm up the incline and then she release to drop back down again. She is instructed to ...
Thursday, August 28, 2014 at 4:15pm

physics
how does the center of gravity affect posture? answer...when a person is carring a load a center of gravity changes to increase stability that person will bent
Thursday, August 28, 2014 at 3:48pm

Intro Physics Help
A runner in a relay race is required to run a distance of 20 m, pick up tbaton, and then turn back to the start. the runner must then run back past the starting point to a location 10 m beyond start, pick up a second baton, turn around and run past start again to a second ...
Thursday, August 28, 2014 at 3:45pm

physics
An unstrained horizontal spring has a length of 0.33 m and a spring constant of 209 N/m. Two small charged objects are attached to this spring, one at each end. The charges on the objects have equal magnitudes. Because of these charges, the spring stretches by 0.021 m relative...
Thursday, August 28, 2014 at 12:02pm

Physics
Suppose gold bars are made such that they are cubic. If they are made cubic, then there volume is given by V = L3, where L is the length of a side of the bar. The price of any gold bar is directly proportional to its volume, so the price of the gold is P = c V, where c is some...
Thursday, August 28, 2014 at 11:57am

Physics
A red ball is thrown down with an initial speed of 1 m/s from a height of 27 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 24.5 m/s, from a height of 0.7 meters above the ground. The force of ...
Thursday, August 28, 2014 at 11:26am

physics
convert 2*10^20am answer 2*10^20*10^-18=2*10^2m
Thursday, August 28, 2014 at 10:57am

physics
convert 2*10^20 am answer 2*10^20*10^-18=2*10^2m
Thursday, August 28, 2014 at 10:52am

12th Grade Physics
Ben pulls a rope that is attached to a wagon with a magnitude of 300N. He pulls it in a way that te rope is at an angle of 30 degrees from the horizontal. The mass of the wagon is 2kg and the mass of Mike, who sits on the wagon, is 20kg. While the wagon moves to the right, the...
Thursday, August 28, 2014 at 10:35am

physics
convert 6.5*10^-3 g.cm/h to kg m/s 6.5*10^-3*10^-2/3600s=1.8*10^-8
Thursday, August 28, 2014 at 10:25am

physics
The pressure of a gas in a container is estimated to be the force exerted per cross-sectional area. If a factor F=(20.0+/-0.5)N.acts on a rectangular cross-section of the container with dimensions x=(5.0+/-0.5). Calculate fractional change in pressure and percentage error in ...
Thursday, August 28, 2014 at 2:53am

physics
A child is pushing a shopping cart at a speed of 0.7 m/s. How long will it take the child to push the cart down an aisle with a length of 17.3 m? (Answer in seconds)
Wednesday, August 27, 2014 at 11:58pm

physics
a constant rrtarding force of50N is applied to a body of mass 20 kg moving initially with speed of 15 ms-1.How long does the body take to stop?
Wednesday, August 27, 2014 at 11:49pm

Physics
From the top of a cliff with 80 m height a stone is thrown vertically and finally hit the surface of ocean. Initial velocity of stone is 40 m/s. Find: (a) time to reach to max height. (b) how high goes from surface of ocean? (c) what is velocity of stone 2 second after thrown...
Wednesday, August 27, 2014 at 8:52pm

Physics
Hello, I don't understand how to do part "d" of the question. Can someone please explain it to me step by step? Do I use the 2nd equation to solve it? Using one of the following formulas: 1. Vy = g * t + Voy 2. y = 1/2 * g * t^2 + Voy * t 3. Vy^2 = Vo^2 * g + 2...
Wednesday, August 27, 2014 at 8:44pm

Physics
Here is a simple example. The inhabitants of a small island begin exporting beautiful cloth made from a rare plant that grows only on their island. Seeing how popular the small quantity that they export has been, they steadily raise their prices. A clothing maker from New York...
Wednesday, August 27, 2014 at 7:59pm

Physics
a boy and a girl carry a 12 kg bucket of water by holding the ends of the rope with the bucket attached in the middle. if there is a angle of 100 degrees between the two segments of the rope ; what is the tension of each part?
Wednesday, August 27, 2014 at 7:40pm

physics
An automobile starts from rest and accelerates to a final velocity in two stages along a straight road. Each stage occupies the same amount of time. In stage 1, the magnitude of the car's acceleration is 2.84 m/s2. The magnitude of the car's velocity at the end of ...
Wednesday, August 27, 2014 at 5:49pm

physics
An airplane travels 200 km/h through the air. If it heads directly against a 40- km/h wind, what is its speed relative to the ground?
Wednesday, August 27, 2014 at 4:25pm

physics
116In nuclei are produced at the rate of 10 s-1. Calculate the maximum number of 116In nuclei (number in equilibrium) in the sample if the half-life of 116In is 54 m. So far I have come up with ... The half life = 54m x 60 s-1 = 3.24 x 103 s-1 (In2) / λ = In2 / 3.24 x 10^...
Wednesday, August 27, 2014 at 1:20pm

Physics
Determine the magnitude of the vector sum V=V1+V2 and the angle theta(x) which V makes counterclockwise from the positive x-axis. V1 = 34 units and makes a 20 degree angle with the +x axis V2 = 28 units and forms a 3,4,5 triangle with the -x axis
Wednesday, August 27, 2014 at 9:16am

Physics
Larry leaves home at 9:03 and runs at constant speed to the lamppost(200 yards from the start). He reaches the lamppost at 9:07, immediately turns, and runs to the tree(1200 yards from the start). Larry arrives at the tree at 9:13. What is Larry’s average velocity, in ...
Wednesday, August 27, 2014 at 3:00am

physics
the diameter of the moon is 3480 km. A.)what is the surface area of the moon? B.)how many times larger is the surface area of earth?
Wednesday, August 27, 2014 at 12:07am

Physics
Determine the magnitude of the vector sum V=V1+V2 and the angle theta(x) which V makes counterclockwise from the positive x-axis. V1 = 34 units and makes a 20 degree angle with the +x axis V2 = 28 units and forms a 3,4,5 triangle with the -x axis
Tuesday, August 26, 2014 at 10:29pm

physics
Vector has a magnitude of 136 units and points 35.0 ° north of west. Vector points 69.0 ° east of north. Vector points 19.0 ° west of south. These three vectors add to give a resultant vector that is zero. Using components, find the magnitudes of (a) vector and (b...
Tuesday, August 26, 2014 at 5:27pm

physics
You measure the mass of a 500 g standard on your balance four times. You get values of 455 g, 456 g, 454 g, and 455 g. Which of the following best describes your balance?
Tuesday, August 26, 2014 at 2:03pm

Physics
If a car is accelerating, is the car's velocity constant. Please sentence explanation.
Tuesday, August 26, 2014 at 1:10pm

Physics
If toy rocket rises vertically and then falls back to the ground, what changes occur in the rocket's velocity and acceleration. Please give a sentence explanation not a formula
Tuesday, August 26, 2014 at 12:37pm

physics
What's the net force acting on an 18-kg object if an acceleration of 3.0 m/s2 is produced? A. 54 N B. 12 N C. 6 N D. 36 N
Tuesday, August 26, 2014 at 12:37pm

Physics
The statically-indeterminate composite beam AB of length 2L is fixed at A (x=0) and is simply supported at B (x=2L). The beam is composed of a core of modulus E0 of constant square cross section of dimensions 2h0×2h0 bonded inside a sleeve of modulus 2E0 and constant ...
Tuesday, August 26, 2014 at 7:17am

physics
A person whose eyes are 2.87 m above the floor stands 2.11 m in front of a vertical plane mirror whose bottom edge is 41 cm above the floor. What is the horizontal distance x to the base of the wall supporting the mirror of the nearest point on the floor that can be seen ...
Tuesday, August 26, 2014 at 5:12am

physics
A CRICKET BALL OF MASS 0.4kg MOVING WITH A VELOCITY OF 72km/h IS BROUGHT TO REST BY A PLAYER . WHAT IS THE MAGNITUDE OF THE AVERAGE FORCE EXERTED BY THE PLAYER?
Monday, August 25, 2014 at 11:53pm

Physics
David, who is 65 kg, is driving his car at a speed of 25 m/s. He sees a dog crossing the road and so he steps on the brake to avoid hitting it. His seatbelt brings his body to a stop in 0.4 s. What magnitude of force does the seatbelt exert on him?
Monday, August 25, 2014 at 10:21pm

Physics
02. Comic-strip hero Superman meets an asteroid in outer space and hurls it at 800 m/s, as fast as a bullet. The asteroid is a thousand times more massive than Superman, yet in the comic strip, he remains stationary after releasing the asteroid. Say, his mass is 107 kg, what ...
Monday, August 25, 2014 at 10:20pm

Physics
wo objects each have a positive charge. The total charge on both objects is 365 µC. When the objects are placed a distance of 1.30 m apart, each exerts an electrostatic force of 24.3 N on the other. What is the charge on each object? (Give your answers in µC.)
Monday, August 25, 2014 at 9:30pm

Physics
Two boys are pulling a box across a horizontal floor as shown in the figure below. vector F 1 = 50.0 N and vector F 2 = 100 N. (a) Find the resultant (or sum) force by the graphical method. (b) Find the resultant (or sum) force by the component method.
Monday, August 25, 2014 at 8:31pm

Physics
Given an angle of 30 degrees, find the minimum initial speed of a cannon ball that travels in a horizontal distance of 15000 mi.
Monday, August 25, 2014 at 2:20pm

Physics
A ball thrown by a boy in the street is caught 5 s later by another boy on the balcony of the house 10 m away and 3 m above the street level. What is the initial speed of the ball? What is the angle above the horizontal at which it was thrown?
Monday, August 25, 2014 at 2:18pm

Physics
The statically-indeterminate composite beam AB of length 2L is fixed at A (x=0) and is simply supported at B (x=2L). The beam is composed of a core of modulus E0 of constant square cross section of dimensions 2h0×2h0 bonded inside a sleeve of modulus 2E0 and constant ...
Monday, August 25, 2014 at 1:17pm

Basic Physics
Determine the minimum gauge pressure needed in the water pipe leading into a building if water is to come out of a faucet on the twelfth floor, 41m above that pipe.
Monday, August 25, 2014 at 1:16pm

Physics
What is the difference in blood pressure (mm−Hg) between the top of the head and bottom of the feet of a 1.88m tall person standing vertically?
Monday, August 25, 2014 at 1:13pm

Physics (density)
A boat made of wood (each piece 5cm in width) begins to sink. To Save yourself you grab a block made of the wood. Determine the area of it, making sure it will hold at least 100kg of weight without sinking.
Monday, August 25, 2014 at 1:12pm

Physics
How is the Sky Screamer at Six Flags an example of Newton's First Law?
Monday, August 25, 2014 at 12:44pm

Physics
CONICAL SHAFT WITH DISTRIBUTED TORSIONAL LOAD The conical shaft AB is made of steel, with shear modulus G0. The shaft has length L and is free at A (where x=0) and fixed at B (where x=L). The shaft is solid, with a linear taper so that the radius of the generic (circular) ...
Monday, August 25, 2014 at 11:47am

physics
Some of the branches of physics that you will study in this course investigate motion, the properties of materials, sound, light, electricity and magnetism, properties of atoms, and nuclear reactions. Give at least one example of an application of each branch.
Monday, August 25, 2014 at 7:45am

physics
question: your propessor enters a dogsled race during the winter break to get started she pulls the sled (total mass 80kg) with a force of 180N at 20degrees the sled moves 5m along horizontal. find the work she does find the final speed of the sled after it moves change in x=...
Monday, August 25, 2014 at 7:40am

physics
an electron in a one-dimensional box undergoes a transition from the n=3 level to the n=6 level by absorbing a photon of wave length 500 nm. what is the width of the box?
Monday, August 25, 2014 at 1:55am

physics
Some of the branches of physics that you will study in this course investigate motion, the properties of materials, sound, light, electricity and magnetism, properties of atoms, and nuclear reactions. Give at least one example of an application of each branch.
Monday, August 25, 2014 at 1:36am

Honors Physics
Give some examples of applications that resulted from work done by physicists. The answers I have are: computers, electricity, cars, and television. Are these acceptable?
Sunday, August 24, 2014 at 11:05pm

Honors Physics
Give some examples of applications that have resulted from work done by physicists on the exploration of space.
Sunday, August 24, 2014 at 10:59pm

Honors Physics
Give some examples of applications that resulted from work done by physicists. The answers I have are: computers, electricity, cars, and television. Are these acceptable?
Sunday, August 24, 2014 at 10:43pm

physics
A ship at sea is due into a port 600 km due south in two days. However, a severe storm comes in and blows it 200 km due east from its original position. How far is the ship from its destination?
Sunday, August 24, 2014 at 5:41pm

physics
You are at a archeological dig an discover a strange artifact. It is a utinsil tha appears to be carved out of an elephant's tusk You analyze it and discover that it has 0.625 the amount of carbon -14 you woul find in a living specimen. How many half lives has the specimen...
Sunday, August 24, 2014 at 4:33pm

Physics
A body travels from rest with acceleration 8m/s(squared)Find its velocity when it has covered a distance of 100 meter?
Sunday, August 24, 2014 at 4:20pm

physics
Write down the unit in which reaction rate is measured in this observation? Equation is Zn(s)+I~ZnI
Sunday, August 24, 2014 at 1:41pm

Physics
At what distance from the earth's surface will a mass of 40.0 kg be just 385.0 in weight?
Sunday, August 24, 2014 at 10:10am

physics
a gun fires Aa bullet of mass 50g the bullet moving with a velocity of 100m/s strikes a sandbag get embedded after travelling 10cm calculate the resistance force exerted by the sand bag on the bulle
Sunday, August 24, 2014 at 9:55am

physics
boy weighting 30 kg is riding a bicycle weighting 50 kilograms if the bycycle is moving at a speed of 90 kilometres per hour towards the west find the linear momentum of the bycycle boy system in s i units
Sunday, August 24, 2014 at 9:44am

physics
considering 3 identical balls. ball 1 with initial speed V collides elastically with balls 2 & 3 whose centres are on a line perpendicular to the initial velocity of ball 1 and ball 2 & 3 are in contact with each other. ball 1 is aimed directly at the contact point and all ...
Sunday, August 24, 2014 at 6:46am

Physics
What is the gravitational force between a proton and an electron in a hydrogen atom if they are separated by a distance of 5.29x10^-9 cm
Sunday, August 24, 2014 at 6:44am

Physics
Charge A has a charge of +2 C. Charge B has a charge of - 3 C and is located 1 meter to the right of A. Charge C is located 1 m to the right of charge Band has a charge of -1C. If a fourth charge (Charge D) is placed 4 m to the right of Charge B, How much charge must it ...
Saturday, August 23, 2014 at 7:28pm

physics
Draw energy graph of the reaction where energy reaction is 1kg mol-1 the energy of the product is 50kg mol-1 and the activation is 50kg mol-1.state whether reaction is exothermic o endothermic
Saturday, August 23, 2014 at 1:00pm

physics
a ball A collides elastically with another ball B initially at rest. A is moving with a velocity of 10m/s at an angle 60' from the line joining the center. select the correct alternative: a)velocity of ball A after collision is 5 m/s b)velocity of ball B after collision is...
Saturday, August 23, 2014 at 10:04am

physics
Q1-In hugyen's principle of wave theory why the waves are move in forward direction not in backward direction means they move forward as a new source why not in backward direction? Ans- I think that waves move in forward direction sir i know that only so please give me a ...
Saturday, August 23, 2014 at 9:12am

physics
a balloon starts rising from the ground, vertically upwards, uniformaly at a rate of 1m/s. At the end of 4 seconds a body was released from the balloon. Calculate the time taken by the realeased body to reach the ground. Take g=10m/s^2
Saturday, August 23, 2014 at 7:41am

PHYSICS
A 20 kg wagon is pulled along the level ground by a rope inclined at 30 deg above horizontal. A frictional force of 30 N opposes the motion, how large is the pulling force if the wagon is moving at constant velocity.
Saturday, August 23, 2014 at 3:16am

Physics
What is the gravitational force between a proton and an electron in a hydrogen atom if they are separated by distance of 5.29x10^-9 cm.
Saturday, August 23, 2014 at 3:09am

Physics
Whats the difference between frictionless and friction in a way of solving? Like in formula, and what formula should use
Friday, August 22, 2014 at 9:58pm

Physics
1.)A force of 250 is just sufficient to start a 50 kg steel trunk moving across a wooden floor. Find the coefficient of static friction. 2.) compute the acceleration of the block sliding down a 30 deg inclined plane if the coefficient of kinetic friction is 0.20.
Friday, August 22, 2014 at 9:38pm

Physics
A 20 kg wagon is pulled along the level ground by a rope inclined at 30 deg above horizontal. A frictional force of 30 N opposes the motion, how large is the pulling force if the wagon is moving at constant velocity?
Friday, August 22, 2014 at 9:17pm

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