Friday

April 18, 2014

April 18, 2014

Number of results: 115,542

**physics**

average speed = 400/20 = 20 m/s^2 constant acceleration (v = a t + starting speed) so begin speed is 0 and end speed is 40 m/s
*Friday, July 6, 2012 at 2:19am by Damon*

**physics**

speed = a t starting from rest speed = 360 * .05 u = speed * cos 46 v = speed * sin 46
*Sunday, September 5, 2010 at 6:25pm by Damon*

**physics**

An object moving with constant acceleration at time t=0 its speed is v. , at t=t. its speed is v./2 , at t=2t. its speed is v./4 . What will be its speed at time t=3t.?
*Tuesday, July 26, 2011 at 11:21am by Tillu*

**Physics**

the vertical speed is vf= g *time the horizontal speed is the kicking speed. Vftotal=sqrt (Vh^2+ Vvf^2)
*Thursday, January 14, 2010 at 5:48pm by bobpursley*

**Physics**

how long does it take to fall 60m? h=1/2 g t^2 vf=g t then, for the speed, combine horizontal speed with the vertical speed as vectors.
*Wednesday, October 20, 2010 at 7:53pm by bobpursley*

**Physics**

speed*cos23*timeinair=8.4 speed= you solve it in terms of t. then vertical equation: hf=hi-4.9t^2+speed*sin23*t put what you solved for speed above into this equation, then solve for timeinair. then solve for speed.
*Wednesday, September 26, 2012 at 4:43pm by bobpursley*

**physics**

A runner, beginning at rest, completed a 50 m run with a final speed of 6 m/s. Assuming constant acceleration. a) What was the average speed of the runner? b) What was the runner's time? c) What was the acceleration? a) half the final speed b) distance/(average speed) c) (...
*Monday, October 2, 2006 at 11:04pm by maria*

**physics**

The speed of the fish at water is a vector combination of the intial horizontal speed, and the terminal vertical speed. I will be happy to check your work.
*Monday, January 10, 2011 at 2:45pm by bobpursley*

**physics**

if a plane is flying at a speed so that the apex half-angle of its shock wave is 30 degrees, what is the speed if the speed of sound is 320 m/s?
*Friday, May 13, 2011 at 4:55pm by Cam*

**Physics**

The most probable speed is the peak of the speed distribution function. The average is the speed-weighted mean of the speed distribution function. They are not the same thing, mathematically
*Thursday, July 19, 2012 at 5:10pm by drwls*

**physics**

let L = wavelength, A = amplitude and w = angular frequency max particle velocity = w A wave speed = 2 pi w L ratio (part speed)/(wave speed) = A/(2 pi L) Note that the ratio is independent of wave speed, w and cord tension. It would have been necessary to know these ...
*Friday, December 24, 2010 at 10:37am by drwls*

**physics**

a girl of mass 40 kg is skating at a constant speed of 1 m/s. supposed she doubles her speed, how much work will be needed to double her speed?
*Monday, January 7, 2013 at 7:06am by merlyn*

**Physics**

When a football in a field goal attemp reaches its max height how does its speed compare to its inital speed? a)it's zero b) it is less than its inital speed c)it is equal to its inital speed d)it is greater than its inital speed since at the max height v=0 isn't the answer a)?
*Tuesday, September 25, 2007 at 7:54pm by Tammy*

**Physics**

When a football in a field goal attemp reaches its max height how does its speed compare to its inital speed? a)it's zero b) it is less than its inital speed c)it is equal to its inital speed d)it is greater than its inital speed since at the max height v=0 isn't the answer a)?
*Wednesday, September 26, 2007 at 2:31pm by Tammy*

**Physics**

The cruising speed in this case is the speed attained after the 1 min of acceleration. Call it V. The average speed during accleration is V/2. (V/2)*(60 s) = 1350 m V = 45 m/s
*Friday, September 7, 2007 at 12:29am by drwls*

**Physics**

speed tangential=2.1/9.7 m/s tangential speed= w*r anglar speed=tangenital speed/radius
*Saturday, February 25, 2012 at 8:47am by bobpursley*

**Physics**

A ball is thrown horizontally from a height of 16.01 m and hits the ground with a speed that is 5.0 times its initial speed. What was the initial speed? Ok so I got a vertical final velocity of 17.714 m/s. Now I need to find the horizontal speed, correct? Which equation can I ...
*Sunday, November 4, 2007 at 11:53am by Lindsay*

**Physics**

A cart has a constant acceleration of a = 2m/s2. At a certain instant its speed is 5 m/s. What is its speed 2 s later and 2 s earlier?. What is its average speed during the time interval of 4s.?
*Sunday, October 3, 2010 at 4:22pm by Jay*

**physics**

If a projectile is launched vertically from the Earth with a speed equal to the escape speed, how far from the Earth's center is it when its speed is 1/9 of the escape speed?
*Saturday, April 28, 2012 at 12:35am by Turk*

**physics**

A pick up truck travelling at constant speed begins to accelerate at 1.5m/s squared for 6 seconds, by which times it has reached a speed of 20m/s. What was its original speed?
*Monday, February 25, 2013 at 12:03pm by Poppy Proasheck*

**physics **

during a journey over which speed varies, the maximum attained speed in comparison to the average speed is always: A)one half of it B) greater than it C)less than it D) equal to it E) none of this
*Monday, September 2, 2013 at 10:09pm by jack*

**Physics**

at 4s, the speed is 24 + 4g at 5s, the speed is 24 + 5g so the average speed over the interval (for one second) is 24 + 4.5g the distance is the speed times the time
*Sunday, September 23, 2012 at 10:58pm by Scott*

**Physics**

If a projectile is launched from Earth with a speed equal to the escape speed, how high above the Earth's surface is it when its speed is three-fifths the escape speed? I keep getting the answer 2.56x10^6 m after solving it a few different ways. Help would be great.
*Saturday, April 28, 2012 at 6:24pm by Kristin*

**physics**

wave speed=859/40 seats/second Width=speed*timestanding I am wondering what this is doing with the title physics, it is basic high school math.
*Thursday, April 30, 2009 at 3:44am by bobpursley*

**physics**

Wind speed vector + Air speed vector = Ground speed vector Perform the vector subtraction. Wind speed = Ground speed - Air speed North component of wind speed = 200 sin30 -150 sin60 = ? East component of wind speed = 200 cos30 -150 cos60 = ?
*Wednesday, December 14, 2011 at 7:37pm by drwls*

**Physics**

Its a question on scalar and vector quantities - speed and velocity have different meanings - speed has no direction, velocity does, hence given no direction, it would be speed. it is instantaneous as average would be 60-0 / 8 = x, whereas the manufacturer is trying to show ...
*Sunday, September 9, 2007 at 1:30pm by Steph*

**Physics**

Its a question on scalar and vector quantities - speed and velocity have different meanings - speed has no direction, velocity does, hence given no direction, it would be speed. it is instantaneous as average would be 60-0 / 8 = x, whereas the manufacturer is trying to show ...
*Sunday, September 9, 2007 at 1:30pm by Steph*

**physics**

The wire length is one half wavelength wave speed is proportional to the square root of tension, so wave speed is doubled here. f*lambda=speed, so if lambda is constant, speed doubled, f must...
*Sunday, December 12, 2010 at 3:19pm by bobpursley*

**Physics**

Can anyone please help me with this question? I don't understand why the speed is v m/s. A sport utility vehicle is travelling at a speed of v m/s. If its momentum has a magnitude of 32,800 kg·m/s, what is the SUV's mass? Thanks I know that I have to use the formula p= m*v and...
*Thursday, May 2, 2013 at 11:39pm by Kathy*

**physics**

A car moving with an initial speed v collides with a second stationary car that is 50.7 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 33.2 percent of the original speed. Calculate the final speed of the second ...
*Wednesday, March 26, 2014 at 7:48pm by Erin*

**physics**

initial speed: 2 m/s a: -9.8 m/s^2 s: -2.5 m final speed: ? Vf^2 - Vi^2 = 2as v^2 - 2^2 = 2•-9.8•-2.5 v^2-4 = 49 v^2 = 53 final speed is approx. 7.28
*Sunday, November 18, 2012 at 9:58pm by Anonymous*

**physics**

Put the 36mph into m/s units. acceleration(final speed-oritinal speed)/time final speed is zero.
*Sunday, November 17, 2013 at 4:10pm by bobpursley*

**Physics**

A ball is thrown horizontally from a height of 19.17 m and hits the ground with a speed that is 4.0 times its initial speed. What was the initial speed?
*Sunday, September 18, 2011 at 12:32pm by Alexandria*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*Thursday, June 20, 2013 at 3:05am by Anonymous*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*Thursday, June 20, 2013 at 3:05am by Anonymous*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*Thursday, June 20, 2013 at 3:05am by Anonymous*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*Thursday, June 20, 2013 at 3:05am by Anonymous*

**physics**

A ball is thrown horizontally from a height of 24.93 m and hits the ground with a speed that is 3.0 times its initial speed. What was the initial speed?
*Saturday, February 1, 2014 at 12:29pm by Tsion*

**physics**

A ball is thrown horizontally from a height of 24.93 m and hits the ground with a speed that is 3.0 times its initial speed. What was the initial speed?
*Saturday, February 1, 2014 at 6:31pm by Tsion*

**physics**

suppose a treadmill has an average acceleration of 4.7 x 10^-3 m/s^2. a. how much does its speed change after 5.0 min? b. if the treadmill's initial speed is 1.7 m/s, what will its final speed be?
*Friday, September 3, 2010 at 12:52am by Ally*

**physics**

Use the formula for speed and that is speed=distance/time 27cm/10sec 2.7cm/sec Therefore we know that the speed of the bee is 2.7cm per second
*Tuesday, June 1, 2010 at 10:12am by Vince*

**College Physics**

a horizontal speed of 15.8 m/s and a vertical speed 10.0 m/s upward. What is the vertical speed 1.12 s later?
*Sunday, September 26, 2010 at 3:22pm by J*

**Physics**

The information provided can yield ground speed 200 km/h, and the speed with respect to the ground, but not air speed. Air speed is affected by wind speed, which is not given. Let V be the actual speed along its climbing path, in earth-frame coordinates. This is probably what ...
*Tuesday, July 6, 2010 at 5:46pm by drwls*

**Physics**

I'm not sure how to do this problem A .40 kg ball is thrown with a speed of 10 s^-1 m at an angle of 30 degrees. (a) What is its speed at its highest point, and (b) how high doe it go? (Use conservation of energy.)
*Thursday, September 24, 2009 at 9:20am by Physics*

**physics **

They are not asking you to graph the collision. All you need to do is apply a momentum conservation formula to compute a final speed. The final speed is half the initial speed of the moving car.
*Monday, January 25, 2010 at 1:47am by drwls*

**physics**

An airplane travels 2800 km at a speed of 700 km/h, decreases its speed to 500 km/h for the next 1500 km and travels the last 1000 km at a speed of 400 km/hr. Find the average speed of the plane for the trip.
*Tuesday, September 13, 2011 at 7:14pm by nikita*

**physics**

You have the initial vertical speed, the horizontal speed will be given by the law of conservation of momentum. In the horizontal... massball*speedball=(massball+massplayer)Vfh solve for the Vfh (final horizontal speed of the ball in the glove) Now add vectors horizontal speed...
*Sunday, December 16, 2007 at 12:07pm by bobpursley*

**Physics HELP!**

Add the vectors. The air speed and wind speed are perpendicular. The resultant speed is the hypotenuse of the vector right triangle. Draw the triangle and you will see that the hypotenuse is in the direction of the resultant velocity. Are you sure about the 22 m/s airplane ...
*Friday, June 11, 2010 at 12:22am by drwls*

**Physics**

The sun rises in the East. Therefore even if stationary, you are already moving East with the surface of the earth. That Eastward speed is 2 pi*earth radius / (24 hr*3600 seconds/hr) If you launch Eastward, your total speed is the speed relative to earth PLUS the speed of that...
*Wednesday, March 19, 2008 at 4:32pm by Damon*

**Physics 2**

You need to get a basic math tutor immediately, or drop physics. The language of physics is math, and you are operating at an algebra I level, at best. You will not succeed. speed-1.8=30/11 speed= 30/11 + 1.8= 4.5m/s Physics comprehension will demand much higher levels of ...
*Friday, February 19, 2010 at 12:21am by bobpursley*

**physics**

The acceleration due to gravity near a planet's surface is known to be 3.20 . Part A If the escape speed from the planet is 9.54 , determine its radius. Part B Find the mass of the planet. Part C If a probe is launched from its surface with a speed twice the escape speed and ...
*Saturday, September 29, 2012 at 8:01pm by sammy*

**Physics**

When you approach a blinking source of light, the frequency of its blinking is seen to: decrease, increase, or remain the same always. I THINK IT IS INCREASING. If you are traveling at close to the speed of light and shine a flashlight out in front of you, a third observer at ...
*Saturday, May 3, 2008 at 2:52pm by clark*

**physics**

change of speed=(final speed-initial speed) = (14+2.3*(12.2-9) - 14)=2.3*3.2 m/s
*Tuesday, September 6, 2011 at 9:36am by bobpursley*

**PHYSICS**

A baseball is hit with a horizontal speed of 16 m/s and a vertical speed of 16 m/s upward. What are these speeds 5 s later? horizontal speed ?? m/s vertical speed ?? m/s
*Saturday, March 8, 2008 at 12:37am by jena*

**Physics**

After 3 seconds she will have increased her speed by 3.9 m/s, attaining 3.9 + 2.2 = 6.1 m/s speed IF she was skating in a straight line. Since 6.1 m/s IS her final speed, she was skating along the initial velocity direction The answer is zero degrees.
*Thursday, January 15, 2009 at 8:25pm by drwls*

**physics**

Oh okay, thank you. The only thing included was a graph giving the points t=0s, speed= 0cm per second; t= .5s, speed= 15cm per second; t=1.1s, speed =28cm per second; t=1.6s, speed=6cm per second.
*Sunday, October 10, 2010 at 12:30am by Amber*

**Physics**

A 96kg soul ascended to heaven at a speed of 12m/s, when he bumps against a 50 kg soul descending to hell at the speed of 15m/s, assuming that soul number 2 has an initial speed of 1m/s, find the initial speed of soul number 1.
*Sunday, January 2, 2011 at 9:49am by DAnielle*

**Physics**

When would instantaneous speed be the same as average speed? would it be when the speed is constant? when the position changes linearly with time or would it be in the limit when the time interval goes to zero? I thought it would be when the speed is constant, but i'm not sure...
*Monday, September 5, 2011 at 12:59pm by Katie*

**physics**

A car moving with an initial speed v collides with a second stationary car that is 46.0 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 37.7 percent of the original speed. Calculate the final speed of the second...
*Monday, March 24, 2014 at 9:45am by Sami*

**physics**

starting from reast a boat increases its speed to 4.12 m/s with constant acceleration. (a) what is the boat's average speed? (b) If it take the boat 4.77s to reach this speed, how for has it traveled?
*Thursday, November 17, 2011 at 5:35pm by taylor*

**physics**

wind speed + plane speed= speed over ground 82S+375@direction=speed W so, 375@direction= W-82S=W+82N 375SinTheta N+ 375CosThetw W is what you want. 82=375 sinTheta solve for Theta. That is the direction N of W. Speed over ground? 375CosTheta.
*Tuesday, February 2, 2010 at 11:37pm by bobpursley*

**Physics (Momentum)**

Can anyone please help me with this question? I don't understand why the speed is v m/s. A sport utility vehicle is travelling at a speed of v m/s. If its momentum has a magnitude of 32,800 kg·m/s, what is the SUV's mass? Thanks I know that I have to use the formula p= m*v and...
*Thursday, May 2, 2013 at 10:26pm by Kathy*

**physics**

An automobile tire has a radius of 0.335 m, and its center moves forward with a linear speed of v = 24.1 m/s. (a) Determine the angular speed of the wheel. (b) Relative to the axle, what is the tangential speed of a point located 0.243 m from the axle?
*Tuesday, July 16, 2013 at 3:01pm by katie*

**Physics**

When would instantaneous speed be the same as average speed? would it be when the speed is constant? when the position changes linearly with time or would it be in the limit when the time interval goes to zero? I thought it would be when the speed is constant, but i'm not sure...
*Monday, September 5, 2011 at 6:45pm by Katie*

**Physics**

A ball is thrown horizontally from the roof of a building 9.0 m tall and lands 8.5 m from the base. What was the ball's intial speed? I have no idea how to do this problemm or what formulas to use because of the fact that I do not know the time interval it took to fall. Sense ...
*Sunday, July 5, 2009 at 5:38pm by Physics*

**physics **

Starting from rest, a boat increases its speed to 4.92 m/s with constant acceleration. (a) What is the boat's average speed? (b) If it takes the boat 5.07 s to reach this speed, how far has it traveled?
*Wednesday, August 29, 2012 at 9:16pm by stoic-rider77*

**Physics**

Speed of a satellite orbit (physics problem)? What is the speed of a satellite in a geosynchronous orbit about Earth? _________m/s Compare it with the speed of the Earth as it orbits the Sun. _________m/s
*Friday, June 29, 2012 at 2:40pm by Sierra*

**physics**

Set a frictionless incline at various measured angles then determine the acceleration of a block by measuring the time it takes to increase from an initial speed to a final speed.If the angle is 20 and the initial speed is 0.68m/s and final speed is 2.43m/s and the time is 0....
*Sunday, November 21, 2010 at 4:00pm by Trista*

**Physics**

You neglected to say what your length and speed dimensions are. That is a serious error in physics. They are probably either feet or meters. If it reaches a speed of 1610 (m/s?)in 1.80 s, its average speed during that interval is 805 m/s. Multiply 805 m/s by the time interval...
*Tuesday, October 7, 2008 at 10:58pm by drwls*

**Physics**

Your diameter and speed require dimensions. Numbers are not enough. Your question can be answered by using the continuity and Bernoulli equations. speed * area = constant P + (1/2)*(density)*(speed)^2 = constant Show your work for further assistance, if needed.
*Sunday, April 24, 2011 at 11:19pm by drwls*

**physics**

A race car enters a flat 200 m radius curve at a speed of 20 m/swhile increasing its speed at a constant 2 m/s2. If thecoefficient of static friction is .700, what will the speed of thecar be when the car beings to slide?
*Thursday, October 13, 2011 at 5:54pm by holt*

**Physics**

solve physics question. a train moves 3.6km from rest to rest in 3minutes. the greatest speed is 90km/h, and the acceleration and retardation are uniform. find the distance travelled at full speed.
*Monday, June 17, 2013 at 8:05am by Anonymous*

**physics**

Tangential speed is given. angular speed= tangential speed/radius.
*Monday, October 22, 2007 at 12:30pm by bobpursley*

**physics**

a wheelof diameter 0.70 meterolls without slipping. a point at the top of the wheel moves with a tangential speed of 2.0 meter/second. a) at what speed is the axis of the wheel moving? b) What is the angular speed of the wheel?
*Monday, March 24, 2014 at 1:10pm by Anonymous*

**Physics**

When a small object is launched from the surface of a fictitious planet with a speed of 52.0 m/s, its final speed when it is very far away from the planet is 32.0 m/s. Use this information to determine the escape speed of the planet.
*Tuesday, April 1, 2014 at 10:04pm by Ying*

**Physics**

(b)A coin is placed 20 cm from the axis of a rotating turntable of variable speed. This speed is gradually increased and the coin remains fixed on the turntable until a rate of 36 rpm is reached. At this point, the coin slides off. What is the coefficient of static friction ...
*Monday, July 26, 2010 at 3:07pm by Physics*

**Physics- HELP**

How to find average speed with a given initial speed, theta, and delta x? I know average speed= total distance/total time, but I am given an initial speed, an angle and delta x. Mark throws a ball to Daniel with an initial speed of 20 m/s at an angle of 45 degrees. If they are...
*Wednesday, December 1, 2010 at 7:26pm by Amm*

**Physics**

1) change speed to m/s 61.1m/s check that. avgspeed=(vf+vi)/2=30.5m/s distance=avgspeed*time I get considerably more than you Remember, under constant deaccleration to a stop, the average speed is 1/2 the initial speed.
*Saturday, January 10, 2009 at 1:33pm by bobpursley*

**physics**

They have provided more information than you need to answer the question. That is to done to give you practice in knowing what to use and what to ignore. The average speed is 2/1.5 = 4/3 m/s. The final speed is twice that, or 8/3 m/s The acceleration is the final speed divided...
*Wednesday, September 15, 2010 at 10:57pm by drwls*

**physics**

He leaves the slide at horizontal speed V and keeps that horizontal speed V for 5 meters and .5 seconds. From that we can get speed V, because distance = speed times time. Now if you know about conservation of energy and this slide is very slippery indeed we can say is kineic ...
*Tuesday, December 11, 2007 at 7:20pm by Damon*

**physics**

Think about it. The speed of the gears' boundaries must match. Since A has a larger radius, it turns more slowly in rpm. So, if A is 6Hz ccw, B is 12Hz cw. The linear speed must match,or the teeth will strip! A's speed is 2π(10)*6 = 120πcm/s B's speed is the same: 2...
*Monday, October 3, 2011 at 1:21am by Steve*

**physics**

a boy walks to a school at a rate of 6km with a speed of 2.5km/h and walks back with a constant speed of 5km/h. his average speed for round trip in km/h is ?
*Saturday, June 25, 2011 at 11:16am by aleeza*

**Physics **

A sound wave in a solid has a frequency of 15.0 kHz and a wavelength of 0.333 m. What would be the wave speed, and how much faster is this speed than the speed of sound in air?
*Tuesday, March 4, 2014 at 10:45pm by Melanie*

**physical**

I have no idea what does this have to do with physics but hope you can explain... A passenger on a bus moving east sees a man standing on a curb. From the passenger's perspective, the man appears to be... a)stand still. b) move west at a speed that is less than the bus's speed...
*Saturday, October 30, 2010 at 3:49am by Aisumi*

**physics**

The frequency does not change. There is no waiting line. As many pulses per second travel on both sides of the boundary. The speed does change. wavelength = speed * period = speed /frequency
*Friday, March 27, 2009 at 3:10pm by Damon*

**physics**

If a runner travels at a speed of 10 m/s for 5 seconds, stops for a short time then continues on at a speed of 8 m/s for 4 seconds. How long was the runner stopped for if his average speed at the end of the trip is 4 m/s.
*Tuesday, February 22, 2011 at 10:25pm by mikey*

**physics**

The speed of an automobile increases from 11 m/s to a speed of 47 m/s over a time period of 9.0 seconds. What is the average rate at which the speed of this car is changing during this time period?
*Friday, September 2, 2011 at 11:03am by Anonymous*

**physics**

If a race car completes a 3 mi oval track in 50 s, what is its average speed? Did the car accelerate? 1. Yes, the speed changed. 2. No, the speed didn’t change. 3. Yes, the direction of the motion changed.
*Sunday, September 25, 2011 at 10:31am by anon*

**physics**

The CM moves diagonally NE at a speed that is the individual car speed multiplied by sqrt2. The individual car speed is therefore 51*0.707 = 36 km/h
*Tuesday, November 8, 2011 at 9:15am by drwls*

**Physics**

average speed= .35rev/s so in 2.9 seconds, it goes... b) well, when it is half done, 2.9/2 seconds has elapsed. average speed= (.7+.35)/2 rev= avg speed*2.9/2 revs.
*Wednesday, November 17, 2010 at 8:47pm by bobpursley*

**Physics**

A car is driven from point A to B at a constant speed of 25.0 m/s along a straight line, and then back from point B to A at a constant speed of 20.0 m/s. The values of the average speed over the entire trip is?
*Tuesday, January 19, 2010 at 6:58pm by Mandy*

**physics**

If a car completes a 3.8 mi oval track in 69.7 s, what is the average speed? answer in mph Did the car accelerate? (A.yes the direction of the motion changed or B. yes the speed changed or C. no the speed didnt change)
*Tuesday, June 14, 2011 at 12:11am by alexa*

**Physics - still confused -Please help**

The velocity of pulling in the line is is V = w * R , which means Linear speed = (Angular speed)*(Radius) = 2.1m/9.7s = 0.2165 m/s Angular speed = 0.2165/0.3 = 0.7216 rad/s
*Saturday, February 25, 2012 at 10:36am by drwls*

**physics**

A ball is thrown horizontally from a height of 18.18 m and hits the ground with a speed that is 4.0 times its initial speed. What was the initial speed?
*Monday, October 10, 2011 at 8:18pm by chad*

**physics**

Conservation of momentum requires that: (alpha particle mass)x(alpha particle speed) = (Th234 speed)x (Th234 mass) The speeds are in opposite directions Therefore (Th34 speed)= (alpha speed)*(4/234)
*Saturday, January 16, 2010 at 3:57pm by drwls*

**physics**

Speed at middle of second 5.5 s interval = 3 x (Speed at middle of first 5.5 s interval) = 170/5.5 = 30.91 m/s = (average speed during that interval) Speed at 8.25 s = 3 x speed at 2.75 s. Therefore: speed at 2.75 s = (1/3)*30.91 = 10.30 m/s Distance travelled during first ...
*Monday, March 5, 2012 at 3:53pm by drwls*

**college physics**

A car is driven from point A to B at a constant speed of 25.0 m/s along a straight line, and then back from point B to A at a constant speed of 20.0 m/s. The values of the average speed over the entire trip is?
*Tuesday, January 19, 2010 at 7:20pm by Mandy*

**Physics Please help**

I'm still confused. to find angular speed = tnngenital speed/radius, would the radii cancel out, leaving only the tangential speed? still confused as to set up
*Saturday, February 25, 2012 at 8:47am by Nilan*

**physics**

A girl riding a bicycle with a speed of 5m/s towards northdirection , observes rain falling vertically down. If she increases her speed to 10m/s , rain appears to meet her at 45degree tp the vertical .what is the speed of rain ?
*Tuesday, August 28, 2012 at 11:15am by manish dagar*

**physics**

a patrol of timing paths each vehicle needs to travel the first half of the distance at a speed of 140 km / h. if the speed limit is 80km / h. which should be the highest average speed of the car in the second half of the section, to avoid being fined?
*Sunday, October 10, 2010 at 12:09am by liz*

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