Falling Definition and 1000 Threads

Homework Statement Particle was thrown directly upwards. Point which is in distance “d” from the beginning of movement is passed by the particle two times. Once going upwards in time “t1” and second time going downwards in time “t2” from the beginning of the movement. What was the initial...

The velocity of a skydiver falling to the ground ... Homework Statement SORRY FOR SO MANY QUESTIONS! I'VE BEEN WORKING THROUGH EACH OF THESE UNTIL I'M COMPLETELY STUCK, SO DON'T THINK I'M JUST TRYING TO SUCK ANSWERS OUT OF YOU FOLKS! The velocity v(t) of a skydiver falling to the ground...

Probably there's a simple answer for the following question. What prevents a neutral particle falling into a black hole from beyond the event horizon - a point it would have to have an escape velocity greater than the speed of light to reach from the inside - from being accelerated past the...

I understand that surviving an elevator fall is unlikely, but physically speaking, what is one supposed to do to maximize one's chances of survival? Why?

Homework Statement A stick of mass M, length L is standing upright on a table, pivoted at the bottom. What is its angular velocity as it hits the table? Homework Equations ang. accel = (3g/2L)cos theta (theta is zero with stick laying on table) The Attempt at a Solution...

All -- With a meter stick standing straight up and pivoted at the *bottom*, what is the final angular velocity as it hits the table? I've found plenty of standard stuff on physical pendulums (meter stick pendulum), where I = 1/12 MR^2, period, etc, but I can't find velocity info...

Homework Statement Hey guys how are you all. Lets see, I'm not a physicist (mathematician actually) but I'm involved in this discussion (some may be aware...) and would like some physics help. (This is not an assessment, tutorial, university, school etc question.) Here's the scenario...

I am studying differential equations from this book by Edwards and Penney, and I seem to have stumbled on this rather bizarre contradiction which I can't seem to get myself out of. The problem, which is a variation on the classic rope falling off a table, goes as follows: "Suppose that a...

A uniform rod of mass 0.62 kg is 6 m long. The rod is pivoted about a horizontal, fric- tionless pin at the end of a thin extension (of negligible mass) a distance 6 m from the cen- ter of mass of the rod. Initially the rod makes an angle of 48◦ with the horizontal. The rod is released...

Not sure if this is in the right subforum but: A chain of uniform mass density, length b, and mass M hangs in a loop from the ceiling (both its ends are adjacent to each other) At time t = 0, one end, end B is released. Find the tension in the chain at point A after end B has fallen a distance...

http://i39.tinypic.com/2qvfrya.jpg That is the problem that I am trying to solve. It is simply a practice question but I want to make sure that I am doing things right and that I am prepared. I understand the concept of this problem and have modeled the problem on paper with triangles. I just...

I've heard and read many times about Galileo and his standing up in the Leaning Tower of Piza. How he dropped two objects of different mass and proving that the two objects hit the floor at the same time if released at the same time. What I never understood ... was WHY this happened. What...

An eagle is flying horizontally at 7.6 m/s with a fish in its claws. It accidentally drops the fish. (a) How much time passes before the fish's speed doubles? (b) How much additional time would be required for the fish's speed to double again? Maybe someone else will understand this...

Homework Statement An object is dropped from a distanse of 2*R(moon radius) from moon senter. How many seconds does it take until impact with moon, and in what speed will it hit? The distanse of the fall will be 1.74*10^6 m. The problem is the not so constant accleration.. ;) gravity...

Homework Statement A 0.5-kg rubber ball is dropped from rest a height of 19.6 m above the surface of the Earth. It strikes the sidewalk below and rebounds up to a maximum height of 4.9 m. What is the magnitude of the impulse due to the collision with the sidewalk? Homework Equations...

Two Space crafts, X and Y, of equal masses, are falling towards the earth. A) What are the values of the following ratios i Wx/Wy ii acceleration of X/acceleration of Y B) Why would the astronaut in either spacecraft be considered to be 'Weightless' PLEASE NOTE: There is a...

Hi, I have a quick question on a problem I can't seem to solve. Any help =) PROBLEM Somebody drops a melon on you from a vertical distance of 60 meters directly above your head. To save yourself, you shoot an arrow straight up at the melon at the instant the melon was released. The initial...

Hi Guys, I have a problem visualising a free falling object to use as a use as a theoretical reference body. I assume that a geodesic path would be the path that such a body would follow, but surely rotational dynamics would preclude such a situation. If there were theoretically such a body...

[b]1. Using separation of variables show that: v' = (cd/M)(v^2) - g has a general solution of: v = 20SQRT10 x ((1+Ae^(t/SQRT10)/(1-Ae^(t/SQRT10)) Homework Equations The Attempt at a Solution Have attempted numerous times with little success help appreciated!

Homework Statement A branch falls from the top of a 95.0 m tall redwood tree, starting from rest. How fast is it moving when it reaches the ground?Homework Equations Total work = \Delta KThe Attempt at a Solution I have no idea how to do this problem.

Was given this problem as a homework assignment but I would like to solve it...just need a push in the right direction. An airliner is cruising at a ground speed of 450 knots. A flight attendant, serving drinks, accidentally knocks a bottle off her cart. The distance from the top of the...

As you look out of your apartment window, you see water balloons falling past. You measure that the balloons are visible (going past the window)for a time t, and the vertical length of your window is L_w. assume that the water balloons were dropped (rather than thrown downward). Determine then...

Homework Statement You're riding a cable car from Bogota up to Monser- rate. During your ride there is a small earthquake that sends vertical, transverse waves propagating along the cable. The cable's tension is T, its linear mass den- sity is u, and the wavelength of the wave is...

just a quick question! will the final velocity of a free falling object always be negative even if the answer is positive?

Calculating Speed of Falling Banana - "Just Before" it Hits Ground? Homework Statement "A monkey drops a banana. Its weight is 1N. It falls 3 metres to the ground. What is the speed of the falling banana just before it hits the ground?" Homework Equations Not sure, but I'm guessing I...

Homework Statement Please see image- Dead problemHomework Equations I want to know, first off, if the two masses hit the ground at the same time (according to my solution, they do, but my friends claim otherwise), secondly, if not how to correct my solution to find the correct times and...

Homework Statement A square loop is cut out of a thick sheet of aluminum. It is then placed so that the top portion is in a uniform magnetic field B, and allowed to fall under gravity. (B is perpendicular to the loop) If the magnetic field is 1 T, find the terminal velocity of the loop...

So, I've been having a bit of an argument with a guy about falling, identical items, with varying masses. Homework Statement For the sake of the argument, we've been using the example of two identical jugs, one filled with water, and the other without. They are dropped at exactly the same...

Homework Statement You drill a narrow hole through the center of the Earth and drop a ball of mass m into it. Describe its motion qualitatively. Homework Equations F=-G*M*m/r^2 The Attempt at a Solution I was thinking that the ball would fall toward the center of the Earth and...

When an apple falls to the ground does it not exert some gravity of it's own on the Earth and thus shortening the distance it falls? Why is it always assumed the Earth does not itself move in physics problems?

Homework Statement A 0.25 kg mass is attached to a spring with spring constant 5.4 N/m and let fall. To the nearest hundredth of a meter what is the point where it 'stops'? diagram here: http://wps.prenhall.com/wps/media/objects/1088/1114633/ch11/grav.gif Homework Equations...

Homework Statement A stone is dropped from a stationary helicopter 500m above the ground, at the equator. How far from the point vertically below the helicopter does it land? Homework Equations Conversation of AM The Attempt at a Solution Let the height above the ground it is...

I have heard (what I consider to be) a myth of a pole lifting off the ground before it hits. That is, set something like a telephone pole up on end with no initial falling velocity, then let it drop. The claim is that the bottom of the pole actually lifts from the ground before the whole thing...

Basically I got in trouble at college for going onto my dorm roof to get my frisbee so what I have to do is write a 3 page paper about what would happen to someone if they fell off of a 4 story building (17 meters tall). Obviously they would die more times than not. But I need to discuss what...

I was just wondering about any equations that would play a part in this situation. Obviously gravity plays a role but like calculating the force you'd hit the ground at like the force in pounds or something anything really is what I need it's just a general question. Preferably a 4 story...

Homework Statement Consider a uniforms cloud of density ρ1 which consists of many little drops that are approximately still.Consider a special rain drop that is a little more bigger than the others so that it starts to fall down.Water drops stays spherical all the way.But the radius gets...

A http://www.cnn.com/2009/US/weather/12/19/winter.weather/index.html" , right in time for Christmas. So every news agency sends a reporter outside to stand in the falling snow, and to emphasize to the audience how hard the snow is falling, what do they always say... "It's really coming down...

Homework Statement A ball falls on the surface from 10m height and rebounds to 2.5m.If duration of contact with floor is 0.01 sec,then average acceleration during contact is- g = 10m/s^2 Homework Equations \alpha = \frac{v_2 + v_1}{t} The Attempt at a Solution Now here v_{1}...

Homework Statement A stone is thrown off a high cliff with speed 30m/s at an angle 0 degrees. At what angle is the stone's velocity 2 seconds after it's thrown. (measired with respect to the horizontal x direction(angle will be negative)) Homework Equations angle = tan(Vy/Vx)...

At an altitude of 315 m above a lake, a hot-air balloon pilot drops a 2.50 kg sandbag. If the bag comes to a stop 4.50 m below the surface of the lake, what force was applied by the water on it? I was thinking v= 2.50kg x 9.81km/h= 24.525m/s i can't remember how to get the force

Homework Statement m1 and m2 only interact gravitationally. They are initially at rest and a distance L apart. They where then released. Where and when will they collide? Homework Equations F_g=G\frac{m_1m_2}{x^2} The Attempt at a Solution For the where part, my argument is that...

Homework Statement the question goes like this a man of mass 70kg falls onto a rescue cushion from a height of 7 m he comes to rest 0.2s after he reaches the cushion the cushion is 2m high when inflated a)find the impact force acting on him (take the weight of the man into...

Question: A stone is falling from the top of a buliding with 32m/s. Air resistance is so small that it can be neglected. the weight of the stone is 24N. Calculate the time in second which the stone takes to reache the ground.

Question: A stone is falling from the top of a buliding with 32m/s. Air resistance is so small that it can be neglected. the weight of the stone is 24N. Calculate the time in second which the stone takes to reache the ground.

Does a free falling ball drops on Earth violate this theory? If we consider the ball and Earth in an isolated system then the ball should continue to drop over time. If the impulse given is extremely negligible that it doesn't cause any significant change in the path of earth, then the...

Homework Statement Gravity on a falling object causes the object to descend a distance of d=4.9t^2, where d is the distance in meters and t is the time in seconds. A bowling bll is dropped from the top of the Eiffel Tower in Paris, France, which is 324 meters in height. If you neglect any...

At t = 0 a rubber ball of mass m is dropped from a height of 10 m. (i) When does it reach the ground? How fast is it moving when it hits the ground? Each time it bounces, the ball looses 20% of its energy. (ii) Calculate the height it reaches on the 1st bounce, and the time at which it hits...

Homework Statement Two small balls with masses 3M and M hang on elastic massless rubber bands (with the M ball attached to and suspended beneath the 3M ball with one rubber band; the 3M ball is suspended from the ceiling by a separate rubber band). When the band between the balls is cut...

Homework Statement A conducting ring with radius a and mass m is placed in a magnetic field at a height H above the origin of the reference frame. The plane of the ring is parallel to the ground, that is, the normal is directed along the z-axis. The electrical resistance per unit length of...

A flowerpot is knocked off a balcony 20.0m above the sidewalk and falls toward an unsuspecting 1.75-m tall man who is standing below. How close to the sidewalk can the flowerpot fall before it is too lat for a warning shouted from the balcony to reach the man in time? Assume the man below...