Free fall Definition and 479 Threads

ok how would i go about solving this an what equations do i use [SFHS99 2.P.40.] A worker drops a wrench from the top of a tower 89.0 m tall. With what velocity does the wrench strike the ground? (Assume the positive direction is upward.) wrong check mark m/s i have to use this...

Can anyone help me with any of these 3 questions? 1. Wrongly called for a foul, any angry basketball player throws the ball straight down to the floor. If the ball bounces straight up and returns to the floor 2.5s after first striking it, what was the ball's greatst height above the floor...

I was given the situation, A rocket, initially at rest on the ground, accelerates straight upward from rest with constant net acceleration a , until time t1, when the fuel is exhausted. Find the maximum height H that the rocket reaches (neglecting air resistance). Express the maximum height...

free fall with drag force If the equation F=-bv^2 describes the drag force of an object...then the differential equation for the object's motion would be: dv/dt= -g+bv/m or is it... dv/dt= g-bv/m After solving the equation, should I get... V=mg/b[1-e^(-bt/m)] Also, does this...

Heres the question: Some crickets can jump 21 cm, how long does it take the cricket to jump 7cm of that 21cm?

Stock on Kerry in an IEM "free fall" Market Quotes: Pres04_WTA.html Quotes current as of 12:31:43 CST, Monday, September 27, 2004. Symbol Bid Ask Last Low High Average DEM04_G52 0.061 0.069 0.067 0.067 0.077 0.072 DEM04_L52 0.210 0.219 0.225 0.207 0.232 0.226 REP04_L52 0.230 0.231...

Q40. A boy stands at the edge of a bridge 20.0 m above a river and throws a stone straight down with a speed of 12.0 m/s. He throws another pebble straight upward with the same speed so that it misses the edge of the bridge on the way back down and falls into the river. For each stone find (a)...

''A DART LEAVES THE THROWER HAND HORIZONTALLY AT A height of 1.9m above the ground, calculate the time taken by the dart to reach the board and the horizontal velocity at which the dart left the throwers hand.'' this is what iv worked out x-0.4 u-? v-0 a-0 t-? i than went onto finding...

This class is killing me. Here's my problem: A woman on a bridge 91.0m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an attempt to hit the raft. The stone is released when the raft has 2.70m more to travel before passing under the bridge. The...

Hi again, My first question has to do with vectors again. But it's not hard. I just can't see my mistake. The problem involves two displacement vectors. A which is 3.00km due south, and B which points due east. No value is given for B. However the resultant vector is 4.49km. So of...

A flowerpot falls off a windowsill and falls past the window below. You may ignore air resistance. It takes time 0.420 s to pass this window, which is of height 1.90 m. Question- How far is the top of the window below the windowsill from which the flowerpot fell? Take the free fall...

Help! Free Fall Problem A pellet gun is fired straight downward from the edge of a cliff that is 13 m above the ground. The pellet strikes the ground with a speed of 30 m/s. How far above the cliff edge would the pellet have gone had the pellet been fired straight upward?

A hot-air balloonist, rising vertically with a constant velocity of magnitude v=5.00m/s , releases a sandbag at an instant when the balloon is a height h=40.0m above the ground . After it is released, the sandbag is in free fall. 1.) Compute the position of the sandbag at a time 0.165s after...

Pleeeeeeeeeeeeeeeeease Help! A test rocket is fired vertically upward from a well. Acatapult gives it an initial speed of 79.2 m/s at ground level. Its engines then fire and it accelerates upward at 4.10 m/s^2 until it reaches an altitude of 950m. At that point its engines fail, and the...

A basketball player jumps 1 meter high off the ground, turns around and starts back down. Estimate the time she is within 30 cm of the top of her trajectory (her hang time.) (HINT: Calculate the time it takes to fall 30 cm from rest and double it.) Explain why that works note...

A ball is thrown horizontally from a height of 15.75 m and hits the ground with a speed that is 5.0 times its initial speed. What was the initial speed? I thought you might have to find time and I got t=1.79s, but after that I cannot seem find my way to the answer Thanks to whom ever can...

Stumped on free fall problem! This is probably an easy question, but I am stumped!A wrecking ball is hanging at rest from a crane when suddenly the cable breaks. The time it takes for the ball to fall halfway to the ground is 1.2s. Find the time it takes for the ball to fall from rest all the...

I am trying to find a velocity for an object that would launch it into space from Earth (straight up, NOT into orbit) and return exactly 8 days later. I cannot use x = v0t + 1/2at^2 (x=0 t=691200 a=9.8 [seconds in 8 days]) because the distance from the Earth changes in such a great way that...

I'm really bad at physics so please excuse me. But I would like some help on this question. I would like to be able to solve it without plugging in any numbers until the end. If a person steps off a building of height h, and free falls on the way down to the bottom. What is the height of the...

You are in the closed elevator with the apple. You feel weightless. So you want to know whether you're free falling or in the outer space. Place the apple about a meter away from your eyes. If the elevator is in free fall, the apple will move close to you slowly, but if you're in the outer...

I have read through the other free fall problems here on the boards and still cannot correctly solve the following: One-half second after starting from rest, a freely falling object will have a speed of about: a)10 m/s b)2.5 m/s c)5 m/s d)20 m/s I find the answer to be (b), 2.5 m/s, but...

I ran across this physics problem in class yesterday, it seems simple but...... (assume simplest case) ok...a screw at the top of an elevator that is traveling upwards comes loose and falls. Does the elevator speed going up effect the free fall time? (like does the elevator move toward the...

An object is releaseed from rest at time t = 0 and falls through the air, which exerts a resistive force such that the acceleration a of the object is given by a = g - bv, where v is the object's speed and b is a constant. If limiting cases for large and small values of t are considered, which...

Can anyone help me out with some free fall equations? and: Assume: g = 9.8 m/s A stone falls from rest from the top of a cliff. A second stone is thrown downward from the same height 2.1 seconds later with an initial speed of 41.16 m/s. They hit the ground at the same time. How long...

I'm sorry, I am just having difficulty with being sure of myself when it comes to these problems. This one states: A stone is dropped into a river from a bridge 43.9m above the water. Another stone is thrown vertically down 1.00 s after the first is dropped. Both stones strike the water at...

model rocket - free fall acceleration again :( The problem states: A model rocket fired vertically from the ground ascends with a constant vertical acceleration of 4.0 m/s^2 for 6.00 seconds. Its fuel is then exhausted, so it continues upward as a free-fall particle and then falls back down...

Consider a particle located at (x0, y0), having inital velocity v0, and the angle of inclination of the velocity vector is [the]. The particle is subjected to a vertical acceleration of -g. It's equation of motion is... x = x0 + v0*cos[the]*t y = y0 + v0*sin[the]*t - 0.5*g*t2 If t>0...

I suppose I am having trouble with this problem because there are no numbers given. Here is the problem: A ball is thrown down vertically with an initial speed of Vo from a height of h. a) What is its speed just before it strikes the ground? Speed is just the magnitude of instantaneous...

i'm talking about droping a ball into a free fall under assumption that it can pass thru the Earth's center all the way to minus height point. case 1:if you say that the force at the dropping point is F=G(/m/R)(M/R)<>0 then the equilibrium point is the center of the earth.but when the ball...