Physics homework Definition and 292 Threads

Homework Statement A(n) 71.3 kg person throws a(n) 0.047 kg snowball forward with a ground speed of 45 m/s. A second person, of mass 64.7 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 2.28 m/s, and the second person is...

Homework Statement A 3.86 kg block slides down a smooth, fric- tionless plane having an inclination of 28◦ . The acceleration of gravity is 9.8 m/s2 . Find the acceleration of the block. Answer in units of m/s2. Homework Equations idk what equation to use? The Attempt at a...

Homework Statement Hello , Please look at question 2 (b). http://phstudy.technion.ac.il/~wn114101/hw/wn2010_hw05.pdf I got that the lagragian is the potential energy (as in part a of the question) How Do I eliminate the lamda so I can write the U (wave) as requested? Or In Other word...

Homework Statement A powerboat heads due northwest at 13 m/s relative to the water across a river that flows due north at 6.0 m/s. What is the velocity (both magnitude and direction) of the motorboat relative to the shore? Homework Equations i'm not sure The Attempt at a Solution...

Homework Statement A force of 2.2N acts tangentially to the rim of a solid 52kg disk, with a radius of 32cm. How long does it take to accelerate the disk, rotating about an axis though it's center and perpendicular to it's plane, from rest to 210 rev/min? Homework Equations Idisk=.5mr^2...

Homework Statement The disk, hvng a weight of 15kN, is pinned at it center O and supports the blck A that has a weight of 3 kN. If the belt which passes over the disk is not allowed to slip at its contacting surface, determine the natural period of vibration of the system. Homework...

Homework Statement A rocket is launched at an angle that is 53 degrees from the ground. It travels at an initial velocity of 25 m/s, and after a certain point, begins to fly at a constant speed of 25 m/s for 25 seconds. After 25 seconds, the rocket experiences failure and begins to crash...

I understand what to do for single step problems, but I get lost when it comes to multi-stepped. Help, please! 1. A 2000 kg car traveling at 20 m/s slides to a stop over a distance of 200 m on a snowy level road. What is this coefficient of friction between car's tires and the road? 2. A...

Hi guys, please help me out on this question, I am doing a Position x Time Graph Lab (displacement vs time). and For the analyzing and interpreting questions, i have this question I am stuck on ... 2. For constant acceleration, how does the average velocity for an interval compare with...

I'm having trouble solving for X for one of my physics homework 1.09= ([5580-x]/[2426.0867+(x/.430)]) Please help! Thank you

Homework Statement Three forces are applied to an object. Force F1 has a magnitude of 23.0 Newtons (23.0 N) and is directed 30.0° to the left of the +y axis. Force F2 has a magnitude of 14.0 N and points along the +x axis. What must be the magnitude and direction (specified by the angle θ in...

Hey. Here are the questions I'm a bit stuck on: 1) The joule is not a base unit. There are several equations which could be used to define the physical quantity energy. Find at least two of them 2) Use one of the equations you have foundnto find the combination of base units equivalent to...

Homework Statement A worker drops a wrench from the top of a tower 111.1 m tall. What is the velocity when the wrench strikes the ground? m/s downward Homework Equations x=vt+1/2at^2 intial velocity is 0 The Attempt at a Solution x = 111.1 + 1/2 ?

A car starts from rest and travels for 5.9 s with a uniform acceleration of +1.3 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.1 m/s2. The breaks are applied for 1.60 s. (a) How fast is the car going at the end of the braking period? (b) How far has the car...

Homework Statement A boy sledding down a hill accelerates at 1.45 m/s2. If he started from rest, in what distance would he reach a speed of 7.60 m/s? Homework Equations (vf)^2 = (vo)^2 + 2ax where vf = final velocity = 7.6 m/s vo = initial velocity = 0 m/s a = 1.45 m/s2 x =...

Homework Statement A 2.00 kg block is at rest at the top of a frictionless inclined plane. The block is...

Homework Statement A rope exerts a force of magnitude 21 N, at an angle 31 deg above the horizontal, on a box at rest on a horizontal floor. The coefficients of friction between the box and floor are Us = 0.55 and Uk = 0.50. The box remains at rest. Determine the smallest possible mass of...

I need help with my Physics Homework! A Car of mass 1000kg decelerates from 20m/s2 to rest in a time of 5 seconds. Calculate the braking force of the car, assuming that there is no friction. Ans: 20 m/s2 / 5 seconds = 4m/s2 Force= ma= 1000 * 4 = 4000N Can anyone explain this to me?

I cannot figure out this problem...can someone help me? A 3500 air-gap capacitor is connected to a 32 battery. If a piece of mica fills the space between the plates, how much charge will flow from the battery? Express your answer using two significant figures.

Determine the x and y components. A 40 lb force vector that makes an angle of 120 degree counterclockwise from the -y direction. I did Ax= (40)(-cos120 degree) and Ay= (40)(sin120 degree) I got the right answer, I just want to make sure that this is the correct way of solving the problem.

Homework Statement The pilot of a small plane finds that the airport where he intended to land is fogged in. He flies 40 miles west to another airport to find that conditions there are too icy for him to land. He flies 20 miles at 15° east of south and is finally able to land at the third...

Physics HWK? Someone help? An airplane flies 200 km due west from city A to city B and then 330 km in the direction of 33.0° north of west from city B to city C. (a) In straight-line distance, how far is city C from city A? I got this and its 509 b) Relative to city A, in what direction is...

Homework Statement Can you help me answer this question? Paolo and some friends want to order a take away. Paolo writes down what they need to know about the two nearest takeaways: Ludo's Pizza: Time to cook food is 1/4 hour Distance to the house is 6.5 KM Deliver on scooters with...

Homework Statement A 0.85kg mass oscillating on a spring w/ spring constant of 45 N/m. How do i determine angular frequency? A 0.85kg mass oscillating on a spring w/ spring constant of 45 N/m. This object reaches a maximum position of 12 cm from equilibrium. Determine: a.) angular frequency...

1)A 3kg heavy winter coat hangs in the middle of a clothesline causing it to sag by an angle of 5 degrees. Find the tension in the clothesline. 2). A car is traveling with a constant speed when the driver suddenly applies the brakes giving the car a deceleration of 4 m/s^2. If re car. Comes...

Homework Statement 123984[/ATTACH]"] Homework Equations H= (NI)/ (2(Pi)r) V=IR The Attempt at a Solution a) total resitance = 100ohms? from this would the current be 0.12A over 1ohm resistor: 0.12V not sure if this is correct even. Any help would be much appreciated.

Tension question. PLEASE HELP! I have a test tmw! In the drawing, the rope and the pulleys are massless, and there is no friction. Find (a) the tension in the rope and (b) the acceleration of the 10.0-kg block. (Hint: The larger mass moves twice as far as the smaller mass.)I know the answers...

Homework Statement How long would it take a radio wave whose frequency is 7.25 x 10^5 Hz to travel from Mars to Earth if the distance between the two planets is approximately 8.00 x 10^7 km.Homework Equations Don't know what to put here. The Attempt at a Solution 7.25 x 10^5 / 8.00...

On a banked race track, the smallest circular path on which cars can move has a radius of 111 m, while the largest has a radius of 157 m, as the drawing illustrates. The height of the outer wall is 15.7 m. Find (a) the smallest and (b) the largest speed at which cars can move on this track...

Homework Statement A flagpole of mass 25kg and 2.5m in length is held in a horizontal position by a cable shown in the diagram. The centre of gravity of the flagpole is at a distance of 1.5m from the fixed end. Determine: a the tension T in the cable; b the vertical component of the force...

Homework Statement When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 75 kg man just before contact with the ground has a speed of 6.0 m/s. (a) In a...

General Physics Homework Question! Please help! A child's pogo stick stores energy in a spring (k= 21000 N/m). At position A (x1=-0.100 m). The spring compression is a maximum and the child is momentarily at rest. At position B (x=0), the spring is relaxed and the child is moving upward. At...

Homework Statement A 5.00-kg object placed on a frictionless, horizontal table is connected to a cable that passes over a pulley and then is fastened to a hangng 9.00-kg object. Find the acceleration of the two objects and the tension in the string. Homework Equations I am using Net...

Homework Statement A bullet of mass 0.0019 kg moving at 487 m/s embeds itself in a large fixed piece of wood and travels 0.55 m before coming to rest. Assume that the deceleration of the bullet is constant. What force is exerted by the wood on the bullet? Homework Equations I...

A 0.800 m-diameter vat of liquid is 2.70 m deep. The pressure at the bottom of the vat is 1.20 atm. What is the mass of the liquid in the vat?

*** Basic Physics Homework *** PLEEZ HELP! these are due at 8. i got transferred to this new school and they are much farther ahead of us in the curriclulum please HELP ME :( ANY ANSWERS ARE GREATLY APPRECIATED :D :D :D #4 PART 1 Two cars travel in the same direction along a straight...

How much work would it take to push two protons very slowly from a separation of (a typical atomic distance) to (a typical nuclear distance)? If the protons are both released from rest at the closer distance in part A, how fast are they moving when they reach their original separation...

hey, I am taking physics 1 and i have homework, but I am not sure where to start or how to do the problems! my book is NOT helpful, so if anyone can help me it will be greatly appreiciated! 1)A ball is thrown upward from the ground with an initial speed of 23.3 m/s; at the same instant, a...

Homework Statement For a system with a single lens, what is the smallest image to object distance that you can achieve? Homework Equations I guess (1/f)=(1/i)+(1/o) The Attempt at a Solution Tried drawing a few ray diagrams but didn't seem to get anywhere :S

A 1000m long and 200m wide (when at rest) spaceship equipped with a chronometer is sent on a roundtrip to their Galactic Base, 8 light years away. (a) Astronauts start the trip after celebrating their captains 29th birthday and they want to make a round trip and return to Earth on the eve of...

Help Please! A 1500-kg racecar can go 0 - 90 km/h in 5.0s. What average power is required to do this?

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A railway truck S of mass 2000 kg is traveling due east along a straight horizontal track with constant speed 12 m s–1. The truck S collides with a truck T which is traveling due west along the same track as S with constant speed 6 m s–1. The magnitude of the impulse of T on S is 28 800 Ns...

Homework Statement http://www.physics.oregonstate.edu/~mcintyre/COURSES/ph429_S06/hw1.pdf See question 3. I am really stuck trying to answer part c. I looked over the solutions to parts a and b and I really just cannot figure out what is going on. This is very weird. Homework Equations...

Homework Statement A small 2.0-mm-diameter circular loop with R = 0.020 Ohms is at the center of a large 100-mm-diameter circular loop. Both loops lie in the same plane. The current in the outer loop changes from +1.0 A to -1.0 A in 0.10 s. What is the induced current in the inner loop...

Homework Statement I am having trouble with two problems. 1. An onion grown in 1994 had a record breaking mass of 5.55 kg. Assume that this onion can approximated by a uniform, solid sphere. Suppose the onion rolled down the inclined ramp that had a height of 1.40 m. What was the onion's...

when a body explode into two different masses, and fly apart. will the two mass have same kinetic energy, or will it experience same force on it during explosion?

Homework Statement A mass M is suspended from a spring and oscillates with a period of 0.820s. Each complete oscillation results in an amplitude reduction of a factor of 0.985 due to a small velocity dependent frictional effect. Calculate the time it takes for the total energy of the...

A rocket is fired in deep space, where gravity is negligible If the rocket has an initial mass of 6000kg and ejects gas at a relative velocity of magnitude 2000m/s , how much gas must it eject in the first second to have an initial acceleration of 25.0m/s^2 ? im stuck on this problem, can...

I must admit, I do not work in student groups on homework that often (or never) and when I seek assistance on homework , it is usually from my professor. I usually try to work on problems independently as much as possible , but when I get stump and try to think about the problem and then...