# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**physics**

Two identical balls A and B are released from the positions .They collide elastically on horizontal position MN. The ratio of the heights attained by A and B after collision will be ?

*Sunday, February 12, 2017 by dharmapal*

**physics**

A ball is let fall from a hight h0.There are n collisions with the earth . If the velocity of rebound after n collisions is vn and the ball rises to a hight hn , then coefficient of restitution e is given by ,

*Sunday, February 12, 2017 by dharmapal*

**physics**

A ball of mass m moving with speed V collides with another ball of mass 2m(e=1/2) in a horizontal smooth fixed circular tube of radius R . Time after which next collision will take place is?

*Sunday, February 12, 2017 by dharmapal*

**physics**

A ball A of mass M collides elastically with another identical ball B at rest .Initially velocity of ball A is u m/s.After collision

*Sunday, February 12, 2017 by dharmapal*

**physics**

a body of mass 65kg falls freely from rest through a height of 50m find the average force exerted by the ground to bring the body to a rest

*Sunday, February 12, 2017 by alex chidera*

**Physics**

An object with a mass of (2.844x10^1) kg is subjected to a force of (3.964x10^3) N directed at an angle of (6.374x10^1) degrees from the x axis. A second force of (1.3x10^2) N acting in the negative X directions is also applied to the object. To two significant figures what is...

*Sunday, February 12, 2017 by Christine*

**physics**

A mechanic pushes a 3090 kg car from rest to a speed of v, doing 5497 J of work in the process. During this time, the car moves 22.1 m. Find the speed v. Neglect friction between car and road. Answer in units of m/s. 1/2mv^2 doesnt work

*Sunday, February 12, 2017 by Mitchell*

**Physics**

A force F 1 of magnitude 5.90 units acts on an object at the origin in a direction θ = 28.0° above the positive x-axis. (See the figure below.) A second force F 2 of magnitude 5.00 units acts on the object in the direction of the positive y-axis. Find graphically the ...

*Sunday, February 12, 2017 by McKynzlea*

**physics**

a car with 4 wheels has the tyres at a pressure of 20N/cm2. Each tyre of 100cm2 in contact with the road. what is the weight of the car.

*Sunday, February 12, 2017 by fiyin*

**Physics**

A stone, 2kg is projected vertically at a velocity of 5m/s at an Angle of 60° Calculate I.Time taken to attain maximum height II.maximum height reached III.The range

*Sunday, February 12, 2017 by Emmanuel*

**physics**

Question 01: 2.0g of Nitrogen gas is at 270C in a fixed volume. If 20% of its total internal energy is due to rotation what is the average velocity of nitrogen molecules? What will be the temperature 2.0 g of Helium gas in a fixed volume if the average velocity of its ...

*Sunday, February 12, 2017 by hash*

**Physics**

If two balls made of iron and aluminium of equal volumes are immersed in a liquid, then will they experience equal up- thrust? Justify your answer.

*Sunday, February 12, 2017 by Sriya*

**Physics**

If the heat of 110J is added to a gaseous system, change in internal energy is 40J, then the amount of external work done is?

*Sunday, February 12, 2017 by Anshu*

**PHYSICS**

--------------A /l\ / 1 \ / 1 \ / 1 \ 1 B C the pendulum has a string of .075m. velocity at c is 3.83m/s how do i find the speed at point b when the angle of B and C is 37 degree

*Saturday, February 11, 2017 by Anonymous*

**physics**

Seven measurements of the length of a table in centimeters are 184.7, 182.3, 182.7, 182.1, 182.2, 184.1, and 182.9. Find the best estimate for the length of the table. Be sure to include units! Answer: Seven measurements of the length of a table in centimeters are 184.7, 182.3...

*Saturday, February 11, 2017 by ana22*

***physics***

what is the smallest time in which a 9.00kW motor can lift a 3500 kg elevator to a height of 9.50m? use 10m/s^2 as g.

*Saturday, February 11, 2017 by Anonymous*

**Physics**

Calculate the final centigrade temperature required to change 20 litres of gas at 120°C and 1 atmosphere to 25 litres at 2 atmosphere.

*Saturday, February 11, 2017 by Busola*

**Physics**

A car accelerates a form an initial speed to higher final sped while the engine puts out constant power. During this time period, magnitude of the car's acceleration was .. a increasing b decresing c constant d unpredictable please explain why also.

*Saturday, February 11, 2017 by Anonymous*

**physics**

You shoot an arrow into the air. Two seconds later (2.00 s) the arrow has gone straight upward to a height of 30.0 m above its launch point part A:What was the arrow's initial speed?part B:How long did it take for the arrow to first reach a height of 15.0 m above its launch ...

*Saturday, February 11, 2017 by ana22*

**Physics**

I drew out image of the situation but still need help. Can someone help with this problem about swinging on wrecking ball when at 1st: wrecking ball is in line with birdbath when at a peak in its trajectory, and in line with front door at the lowest point in the trajectory. ...

*Saturday, February 11, 2017 by henry*

**physics**

Find the direction and magnitude of the following vectors. A⃗ =( 22 m )x^+( -15 m )y^ Express your answer in degrees using three significant figures. θA = Part B Express your answer in meters using two significant figures. |A⃗ | = m Part C B⃗ =( 2.5 m )x^+( 16 m )y^ ...

*Saturday, February 11, 2017 by ana22*

**Physics**

a periscope is an optical instrument made of two plane mirrors inclined at an angle 45 with respect to the axis of the tube. an observer places her eye at point O. draw the path of a ray light issued from A. determine the position and the nature of the image of A given by two ...

*Saturday, February 11, 2017 by Sarah*

**physics**

For a flourish at the end of her act, a juggler tosses a single ball high in the air. She catches the ball 3.6 s later at the same height from which it was thrown. Part A-What was the initial upward speed of the ball?2sf

*Saturday, February 11, 2017 by ana22*

**Physics**

what are the factors that does not affect the time period of pendulum ?? Please help me in monday there is my exam please help me:-(

*Saturday, February 11, 2017 by Raghav*

**physics**

a car of mass 800kg attains a speed of 25m/s in a second.calculate the power developed in the engine

*Saturday, February 11, 2017 by Rantimi*

**physics**

How much elastic potential energy is stored if a 5kg object is suspended from a whose spring constant is 100N/m

*Saturday, February 11, 2017 by Muller*

**Physics**

While swinging on the wrecking ball, a student notices that, at first, the wrecking ball is in line with her birdbath when it is at a peak in its trajectory, and in line with her front door at the lowest point in the trajectory. However, since drag is acting against the ...

*Friday, February 10, 2017 by henry*

**Physics**

While swinging on the wrecking ball, a student notices that, at first, the wrecking ball is in line with her birdbath when it is at a peak in its trajectory, and in line with her front door at the lowest point in the trajectory. However, since drag is acting against the ...

*Friday, February 10, 2017 by henry*

**physics**

How much heat energy must be added to a 3.0 cm × 3.0 cm × 3.0 cm block of aluminum to raise its temperature from -50∘C to 50∘C?

*Friday, February 10, 2017 by Anonymous*

**Physics**

Hello, I have a question and I would like to know if anyone can help me. Well I was reading about the motion of an ideal "yo-yo" and I found that mechanical energy is conserved, but there´s something that I don´t understand and it´s about the work performed by the tension. ...

*Friday, February 10, 2017 by Amy*

**Physics**

At the gym, a woman lifts 40 kilograms of weights on the leg press machine. It takes her 0.5 seconds to raise the weights a vertical distance of 0.4 meters. How much power does the woman generate when lifting the weights? A) 180 watts B) 200 watts C) 320 watts D) 500 watts

*Friday, February 10, 2017 by kek*

**Physics**

In an inelastic collision, a steel ball of mass 200 g was hit hard into a large ball of dough of mass 700 g. The velocity of the steel ball was 25m/s. After the collision, the steel ball was stuck in the dough, and this combined system rolled for some time. What was the ...

*Friday, February 10, 2017 by kek*

**Physics**

A student makes ice cream using an old-fashioned hand-crank machine. He does 40 joules of work each time he turns the crank in a complete circle. The crank handle makes a circular path with a diameter of 0.5 meters. The student turns the crank at a rate of once every 1.6 ...

*Friday, February 10, 2017 by kek*

**Physics**

A wheel has a radius of 100 cm. How far (path length) in meters does a point on the circumference travel if the wheel is rotated through angles of (a) 30°, (b) 60 rad, (c) 60 rev, respectively?

*Friday, February 10, 2017 by jack*

**Engineering Physics Opt B**

9. The flywheel shown in Figure 14.8 may be considered to be a steel cylinder (density 7800 kg m−3) of outer radius 40 cm and depth 12 cm, but with the central section (of outer radius 18 cm) missing. a. Use this simplification to estimate its moment of inertia. Ignore the ...

*Friday, February 10, 2017 by Shrish*

**physics**

Lake Champlain, bordered by New York, Vermont, and Quebec, has a surface area of 1,126 km^2. If the energy (173 PJ) is provided by sunlight shining on the lake at an average rate of 200 W/m^2 but with only half that amount absorbed, how long will it take the lake to absorb the...

*Thursday, February 9, 2017 by Joseph*

**Physics**

A 30.0kg blcok is resting on a flat horizontal table. ON top of this block is resting a a 15.0kg block, to which a horizontal spring is attached, as the drawing illustrates. The spring constant of the spring is 325N/m. The coefficient of kinetic friction between the lower ...

*Thursday, February 9, 2017 by TI*

**Physics**

A wrecking ball is swinging at just the right height so that the student can stand at the bottom of the trajectory (lowest point) and grab onto the ball to swing – something that is just way too tempting for this inquisitive student. In order to justify invading the ...

*Thursday, February 9, 2017 by Amy*

**PHYSICS**

A gun fires a shell at an angle of elevation of 30* with a velocity of 2000ms-1.(A)what is the range of the shell.

*Thursday, February 9, 2017 by AFOLABI IDRIS.*

**Physics 202**

An inquiring student that has a mass of 65.0 kg is watching a crane with a wrecking ball demolish a building next door. The wrecking ball is swinging parallel to the property fence between her house and the neighbor’s. In an effort to estimate the length of the cable on the ...

*Thursday, February 9, 2017 by Angela*

**PHYSICS**

A lemming runs horizontally off the side of a 27.8 m cliff at 1.12 m/s. How long will it take for the lemming to hit the water? How far will it travel in the horizontal direction?

*Thursday, February 9, 2017 by Jay*

**physics**

A sign with a mass of (24) kg is hanging in two wires both making an angle of (52) degrees with the vertical. Find the tension in one of the wires. Give your answer in newtons (N) and with 3 significant figures.

*Thursday, February 9, 2017 by dalia*

**Physics**

Consider a child standing on a beach who gets hit by a wave. The child weighs 30 kg, and the portion of the wave that hits the child contained 60 kg water. If the wave had a period of 2 seconds and a wavelength of 6 meters, how fast will the child be moving after it is hit by ...

*Thursday, February 9, 2017 by Ellie*

**physics**

if someone throws a .1kg ball at the speed of -25m/s, why is the average net force positive instead of negative?

*Thursday, February 9, 2017 by homework*

**physics**

a bird flies 3km west and then 4km south. find the resultant displacement of the bird

*Thursday, February 9, 2017 by Holly*

**physics**

a cyclist travels 2.5km east, then 10km south and finally 5km west. determine the cyclist's overall displacement from their starting point.

*Thursday, February 9, 2017 by Holly*

**Physics**

A 15.0 gram bullet with a speed of v is fired into a 400 gram block of wood that is initially at rest on a surface. The coefficient of kinetic friction between the block and the surface is 0.250. The block of wood is attached to a horizontal massless spring with a spring ...

*Wednesday, February 8, 2017 by Claire*

**Physics**

A boat starting on one side of the river heads to the south with a speed of 1.5 m/s, the river flows to the east at .8 m/s. What is the resultant velocity to the side of the river? And if the river is 50 m wide calculate the displacement of the boat

*Wednesday, February 8, 2017 by Anonymous*

**Physics**

3 identical point charges Q are placed at the vertices of equilateral triangle (length of each side is equal to 2m) if Q=60uC, what is the magnitude of Electrostatic force on any one of the charges.

*Wednesday, February 8, 2017 by chris*

**physics**

If 32s is required for an object to reach maximum height, what will be the time for an object to come back to its initial position a. 32s b. -32s c. 64s d. 16

*Wednesday, February 8, 2017 by taroon*

**physics**

In 5 seconds a car accelerate from 0 to 40 m/s. 20 sec after reaching 40m/s the car comes to a complete stop. if this deceleration takes 4 sec, how far has the traveled since its trip began? a)100m/s b)800m/s -c)980m/s- d)1140m/s e)1700m/s i got B but teach marked it wrong. ...

*Wednesday, February 8, 2017 by Anonymous*

**physics**

two balls are dropped in a vacuum. if one is caught in half the time as the other what is the difference in distance the balls traveled? a.1/4*t b.1/4*t^2 c.1/2*t^2 d.15/3*t e.15/4*t^2 I believe it is b. but i'm not 100% sure.

*Wednesday, February 8, 2017 by Anonymous*

**physics**

a box with a mass of 25kg is lifted (without acceleration) through a height of 2.0m, in order to place it upon the shelf of a closet. The value of acceleration due to gravity g= 9.8ms^2 How much work is required to lift the box to this position? i figured out the potential ...

*Wednesday, February 8, 2017 by ryan*

**Physics**

Sarah walks 5 miles 35 degrees north of east, and then decides to walk 6 miles due west. What is her final displacement? I drew it out, used the Pythagorean theorem and ended up with square root -11 which is obviously wrong. I'm really confused as to what to do with the angle ...

*Wednesday, February 8, 2017 by Jack*

**physics**

Four forces are acting on an object in static equilibrium: Force 1 has a magnitude of 46.0 N and is acting at an angle of (54) degrees above the positive x-axis. Force 2 has a magnitude of (42) N and is acting along the positive x-axis. Force 3 has a magnitude of 34.5 N and is...

*Wednesday, February 8, 2017 by dalia*

**physics**

. If planet Elijah has a mass of 6.0 x 106 kg and a radius of 4.0 x 104 km. What would be the force on the surface of the planet? (let the second mass equal 1 kg)

*Wednesday, February 8, 2017 by someone*

**Physics**

A locomotive pulls 12 identical freight cars. The force between the locomotive and the first car is 150.0 kN, and the acceleration of the train is 2 m/s2. There is no friction to consider. Find the force between the eleventh and twelfth cars. (Express your answer to two ...

*Wednesday, February 8, 2017 by Tim*

**physics**

A stationary skateboarder I with a mass of 50 kg pushes a stationary skateboarder II with a mass of 75 kg. After the push the skateboarder II moves with a velocity of 2 m/s to the right. What is the velocity of the skateboarder I?

*Wednesday, February 8, 2017 by keven*

**physics**

If a golden eagle is flying due west with a speed of 32 mph, and encounters a wind that blows it north at 11 mph, what is the resultant velocity of the eagle in m/s? At what angle must the eagle be heading in this direction?

*Wednesday, February 8, 2017 by Jay*

**Physics**

You decide to repeat Archimedes experiment and determine the density of a candle holder. you suspend it from a spring scale and scale reads 8.0N. You then lower the holder into a tub of water until completely submerged and it reads 5.0N. what is the volume and density of the ...

*Tuesday, February 7, 2017 by eduardo*

**Physics**

The resistance of 10 ft length of a 20 mil iron wire is 1.8 ohms. What is the resistivity of the iron?

*Tuesday, February 7, 2017 by Mycah*

**physics/calculus**

A stone is thrown straight up from the edge of a roof, 600 feet above the ground, at a speed of 12 feet per second. A. Remembering that the acceleration due to gravity is -32 feet per second squared, how high is the stone 6 seconds later? B. At what time does the stone hit the...

*Tuesday, February 7, 2017 by kloe*

**physics**

United States currency is printed using intaglio presses that generate a printing pressure of 8.1 x 104 lb/in2. A $20 bill is 6.1 in. by 2.6 in. Calculate the magnitude of the force (in pounds) that the printing press applies to one side of the bill.

*Tuesday, February 7, 2017 by Tyler*

**physics**

An airtight box has a removable lid of area 2.87 × 10-2 m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 7.20 × 104 Pa. The inside of the box is completely evacuated. What is the magnitude of the force required to pull the ...

*Tuesday, February 7, 2017 by Tyler*

**physics**

Accomplished silver workers in India can pound silver into incredibly thin sheets, as thin as 3.00 x 10-7 m (about one hundredth of the thickness of a sheet of paper). Find the area of such a sheet that can be formed from 3.70 kg of silver.

*Tuesday, February 7, 2017 by Tyler*

**Physics**

I have this very confusing two part question that i am having trouble understanding. For the first question i first created a free body diagram to show the forces acting on both the boxes. However i am unsure of what to do after this since i don't understand how to use newtons...

*Tuesday, February 7, 2017 by joe*

**physics**

Two chambers are filled with a fluid. The ceiling of chamber 1 is at the same level as the floor of chamber 2. The pressure at the floor of chamber 2 is 1.2 × 105 Pa. If the area of the ceiling of chamber 1 is 2.0 m2, what is the magnitude F of the force exerted by the fluid ...

*Tuesday, February 7, 2017 by Tyler*

**Physics**

Car A is 12 m ahead of car B on a straight stretch of road. Car A starts from rest and accelerates away from B at 4.0 m/s2. Two seconds later B starts from rest and accelerates after A at 6.0 m/s2. How long will it take B to catch A? How far will B have travelled?

*Tuesday, February 7, 2017 by John*

**Science physics**

A uniform metres rod of weight 100N carries a weight of 40N and 60N suspended from the 20Cm and 90cm marks respectively, where will your pivot a knife edge to balance the rod.

*Tuesday, February 7, 2017 by Obert*

**Physics**

A ball of mass 8kg falls from a height of 100m,neglecting air resistance calculate it total energy after falling a distance

*Tuesday, February 7, 2017 by Ewatomi*

**physics**

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 11.2 m long. His speed at the bottom of the swing is 7.4 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that Tarzan can have and ...

*Tuesday, February 7, 2017 by dan*

**Physics**

An Air Craft Flies 800km Due East And Then 600km Due North.Determine The Magnitude Of Its Displacement.

*Tuesday, February 7, 2017 by Ifeanyi*

**Physics**

A ferry-boat is rectangular in shape, with an overall area of 30.0 m2. When the boat is loaded with gravel, it sinks to a depth of 2.8 m in the water. What is the total weight of the boat + gravel? Show your work.

*Tuesday, February 7, 2017 by Lenny*

**Physics**

If you suspend a 90-N rock beneath the surface of ethanol, the tension required to support it is only 60 N. What volume of ethanol (density of 789.2kg/cubic meter) must therefore be displaced? Show your work.

*Tuesday, February 7, 2017 by Lenny*

**Physics**

Explain in detail how you would find the density of an unknown high-density object if you had only the objects listed below.If you show calculations, make sure you define your variables.Assume all containers are large enough to hold the object.... You have: - beaker with ...

*Tuesday, February 7, 2017 by Lenny*

**Physics**

Some stoves use the heat produced by current flowing through a conductor. If the heating element (conductor) has a resistance of 30 ohms, how long will the burner have to work to heat 500 g of 30°C water up to its boiling point? The specific heat of water is 4.19 x 103 J/kg...

*Tuesday, February 7, 2017 by Ellie*

**physics**

an object starts from rest and accelerates uniformly to a speed of 100 m s^-1 after 5s. calculate the acceleration of the object.

*Tuesday, February 7, 2017 by dave*

**Physics**

A force of 800 N is required to move a 9000 N boat through the water with a speed of 20 m/s. The boat’s engine is providing energy at a rate of

*Monday, February 6, 2017 by Garrett*

**physics**

Blood flows through a major artery at 1.3 m/sfor 0.40 s, then at 0.70 m/sfor another 0.40 s through a smaller artery. Part A Is the average speed of the blood 1.0 m/s, greater than 1.0 m/s , or less than 1.0 m/s? Verify your answer to Part A by calculating the average speed.2sf

*Monday, February 6, 2017 by hi*

**physics**

can you graph this for me? In heavy rush-hour traffic you drive in a straight line at 12 m/s for 1.5 minutes, then you have to stop for 3.5 minutes, and finally you drive at 15 m/s for another 2.5 minutes. A Plot a position-versus-time graph for this motion. Your plot should ...

*Monday, February 6, 2017 by ana22*

**physics**

Explain in detail how you would find the density of an unknown high-density object if you had only the objects listed below.If you show calculations, make sure you define your variables.Assume all containers are large enough to hold the object.... You have: 1. - A spring scale...

*Monday, February 6, 2017 by Anonymous*

**physics**

Mrs. Johnson's kid is trying to drink with a straw that runs through an airtight cork in the top of a bottle of water. Please explain to her kid why he won't get any water.

*Monday, February 6, 2017 by Anonymous*

**Physics**

While driving in the rain at 30 m/s you notice that the raindrops appear to be going straight down. After dropping your little sister off at daycare you turn around and drive the opposite direction at the same speed. However now you notice that the rain is making an angle of ...

*Monday, February 6, 2017 by Anonymous*

**Physics**

You are on a tight budget so you’ve let your tires get more worn than they should and now their radius is 15 mm less than they were originally. Is your odometer over-estimating or under-estimating the distance you drive?

*Monday, February 6, 2017 by Anonymous*

**Physics**

While at the county fair you take a ride on the carousel and notice that it goes around once in 12 s. The radius of the carousel is 15 m. As the ride comes to an end, it slows down smoothly, coming to a stop in 2.5 revolutions. What is the magnitude of the rotational ...

*Monday, February 6, 2017 by Anonymous*

**Physics**

The amplitude of a spring oscillator decreases by 50% after 1 period. What is tgr amplitude after 3 oscillations? What is the time constant assuming that one period is 2seconds?

*Monday, February 6, 2017 by Naida*

**Physics**

A circus cat has been trained to leap off a 12-m-high platform and land on a pillow. The cat leaps off at v0 = 3.6 m/s and an angle θ = 37°

*Monday, February 6, 2017 by Eric*

**physics**

What is the ground velocity of an airplane if its air velocity is 800 km/h [E] and the wind velocity is 60 km/h [42 E of N]?

*Monday, February 6, 2017 by malva*

**Physics**

Explain in detail how you would find the density of an unknown high-density object if you had only the objects listed below.If you show calculations, make sure you define your variables.Assume all containers are large enough to hold the object.... You have: 1. - A spring scale...

*Monday, February 6, 2017 by James*

**Physics**

You want to carry an 800kg object into the air using a helium balloon. What size of a helium balloon (I'm looking for volume) would be required to accomplish such a task? Assume the density of air is 1.25 kg/m3 and the density of helium is 0.18 kg/m3.

*Monday, February 6, 2017 by James*

**Physics**

You drill a well to a depth of 100-m. Find the difference in water pressure, comparing the top and bottom of the well

*Monday, February 6, 2017 by Stuart*

**physics**

A hippo has a mass of 6000kg. When standing on 4 feet, how much pressure is exerted on the ground? Assume each foot has an area of 0.10 square meter. Show your work.

*Monday, February 6, 2017 by Anonymous*

**physics**

A hippo has a mass of 6000kg. When standing on 4 feet, how much pressure is exerted on the ground? Assume each foot has an area of 0.10 square meter. Show your work.

*Monday, February 6, 2017 by Charlie*

**physics**

Mrs. Johnson's kid is trying to drink with a straw that runs through an airtight cork in the top of a bottle of water. Please explain to her kid why he won't get any water.

*Monday, February 6, 2017 by Lenny*

**physics**

A hippo has a mass of 6000kg. When standing on 4 feet, how much pressure is exerted on the ground? Assume each foot has an area of 0.10 square meter. Show your work.

*Monday, February 6, 2017 by Brett*

**physics**

A ferry-boat is 4 m long and 6 m wide, and floats in fresh water. A 400kg horse is loaded onto the ferry. How much deeper will the ferry float when it is loaded with the horse? Show ALL of your work. Include units in your solution.

*Monday, February 6, 2017 by Ronny*

**physics**

Three cubic meters of liquid nitrogen has a mass about 2700 kg. When this much liquid nitrogen evaporates into gaseous air of density 1.25 kg/m3, what will its volume be? Show your work

*Monday, February 6, 2017 by Stuart*

**PHYSICS**

IP A tennis player moves back and forth along the baseline while waiting for her opponent to serve, producing the position-versus-time graph shown in the figure(Figure 1) .Without performing a calculation, indicate on which of the segments of the graph, A, B, or C, the player ...

*Monday, February 6, 2017 by ana22*

**Physics**

A man pulls a box with a force of 70N along the positive y-axis,while a boy pulls it with a force of 50N,making an angle of 80 degrees counter clock-wise with the positive y-axis. (i)In what direction should a second boy apply a force of 60N so that the box move along the ...

*Monday, February 6, 2017 by Killian*

**physics**

A particle has an acceleration of +6.24 m/s2 for 0.440 s. At the end of this time the particle's velocity is +9.36 m/s. What was the particle's initial velocity?

*Monday, February 6, 2017 by ana22*