Saturday

April 19, 2014

April 19, 2014

Number of results: 24,616

**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**

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*

**computers again**

what is the difference between motherboard speed and the processor speed for computers such as the 80386DX Your use of the term "motherboard" speed is outdated. I assume you mean motherboard bus speed. Processor speed can be higher than that, and normally, it is a fixed ...
*Thursday, September 7, 2006 at 2:21am by Anonymous*

**Trig**

Downstream, he is going with current, 2mph. Crosswise, he is going 1.8mph. Draw the diagram. I see TanTheta=1.8/2.0 His actual speed? speed=sqrt(2^2+1.8^2) or speed=2.0/sinTheta
*Monday, May 10, 2010 at 12:54pm by bobpursley*

**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*

**math**

w=speed of wind a=speed of airplane Use speed*time = distance (a-w)*(10/3)=960 ...(1) (a+2)*(5/2)=960 ...(2) Solve for a and w.
*Wednesday, September 22, 2010 at 9:47pm by MathMate*

**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*

**Math**

if boat speed = b, and river speed = r, then since speed = distance/time, b+r = 12/1.5 = 8 (downstream) b-r = 12/6 = 2 (upstream) b=5,r=3
*Sunday, March 10, 2013 at 10:13pm by Steve*

**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*

**Science**

Please i really need help with this!!! Question: Suppose a treadmill has an average acceleration of 4.7x10^-3 m/s. a)how much does its speed change after 5min? b)if the treadmill's speed 1.7 m/s, what will its final speed be?
*Tuesday, September 13, 2011 at 8:15pm by Leia*

**Physica**

2m is not a speed. You must mean that he lifts the mass 2m at a constant speed. The speed is not needed. Work done is M*g*H H = 2.0 m M = 2.0 kg g = the acceleration of gravity. Use the Earth value.
*Sunday, July 15, 2012 at 3:33am by drwls*

**Physics**

easy anwer. You are looking for in the end speed, but to get there, you start with distance on each side. So XXXXN*2.5 is the distance (2.5 is the time, distance=speed*time) It could have been done your way.. 1000N/2.5 (speed)= speed wind+ speed plane My way was.. 1000N (...
*Wednesday, October 26, 2011 at 11:30am by bobpursley*

**algebra**

tugboat goes 160 miles upstream in 10 hours. The return trip downstream takes 5 hours. Find the speed of the tugboat without a current and the speed of the current. speed of tugboat is speed of the current is
*Friday, March 30, 2012 at 10:29pm by scott*

**Algebra**

let Vc be the current speed and Vb be the boat speed in still water. Here is what you know: Vb + Vc = 10 (downstream speed) Vb - Vc = 6 (upstream speed) Adding the two equations gives you 2 Vb = 16 Solve for Vb and then Vc
*Wednesday, January 21, 2009 at 10:58pm by drwls*

**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**

Car A is traveling at a constant speed v A = 130 km /h at a location where the speed limit is 100 km/h. The police officer in car P observes this speed via radar. At the moment when A passes P, the police car be- gins to accelerate at the constant rate of 6 m/s 2 until a speed...
*Sunday, September 9, 2007 at 12:58pm by Anonymous*

**Nautical**

You can always determine wave speed by knowing ship speed and direction, wave direction, and time it takes for wave to travel ship length (relative speed). What you have is wave speed relative to ship speed, so you do a vector addition. Wind speed does not matter, as long as ...
*Friday, November 23, 2007 at 3:34am by bobpursley*

**science/physics**

I do not know. Was this question in your text? It depends how squishy you are.F = m a = rate of change of momentum = m *(change in speed/time to change speed) But time to change speed from zero to speed of the truck depends on howmuch the truck compresses you on contact. If ...
*Tuesday, August 9, 2011 at 1:15pm 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 object of mass 3.00 kg is subject to a force Fx that varies with position as in the figure below. Find the work done by the force on the object as it moves as follows: (a) from x = 0 to x = 4.00 m 1 Your response differs from the correct answer by 10% to 100%. J (b) from x...
*Tuesday, October 20, 2009 at 8:08pm by fdtc*

**Calculus**

The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400). a) Determine the legal speed speed that will maximize the fuel efficiency if the speed limit is 50 km/h. The answer is 50 km/h but my teacher said it can't be that. Any...
*Sunday, March 4, 2012 at 3:19pm by Jake*

**scicnec**

An earth satellite in an elliptial orbit moves with a) slower speed as it ages b) none of the above c) constant speed d) faster speed as it ages Just need to know if my answer or right or wrong. Thanks! :) d
*Tuesday, August 17, 2010 at 4:12pm by ant*

**algebra2trig**

the angular speed is 2π/27 radians/second (all the other pieces of data are irrelevant for the angular speed. If you wanted the horse's linear speed then they would enter the picture.)
*Thursday, April 28, 2011 at 1:46am by Reiny*

**Math**

angular speed=angle/time convert 220 degrees to radians.. Angle=220/360 ( 2PI) solve for angular speed. linear speed=angular speed* (3959+220)
*Sunday, October 21, 2012 at 5:22pm by bobpursley*

**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*

**Math**

The Danville Epress travels 280mi at a certain speed.If the speed had been increased by 5mph the trip could have been made in 1 hour less time.Find the actual speed.
*Tuesday, February 15, 2011 at 7:29pm by Nicole*

**math**

The Danville Epress travels 280mi at a certain speed.If the speed had been increased by 5mph the trip could have been made in 1 hour less time.Find the actual speed.
*Tuesday, February 15, 2011 at 10:31pm by Nicole*

**math**

The train slows down uniformly from a speed of 50m/s to a speed of 10m/s in a time of 20sec,During the next 30sec,it accelerates uniformly to a speed of u metres/sec.calculate the retardation from t=0 to t=20?
*Friday, May 3, 2013 at 10:21am by Meggy lep*

**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**

A roulette wheel with a 1.0m radius reaches a maximum angular speed of 18 rad/s before it stops 35 revolutions ( 220 rad ) after attaining the maximum speed. How long did it take the wheel to stop? Unless you mean the 35 revs occur after max speed, it cannot be solved. The ...
*Tuesday, December 19, 2006 at 4:05pm by Robert*

**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*

**Science**

mach=speed sound what is the speed of sound at 1C? vsound=If I remember correctly 331(1+.6TempinC) check that formula. get the speed of sound, multiply it by 2.5
*Wednesday, April 3, 2013 at 10:42pm by bobpursley*

**speed of light**

The meter is defined as the distance light travels in 1/2.99792458×108 seconds. This definition requires that the speed of light be accurately known. This speed can be measured with high precision and is defined to be exactly 2.99792458×108 meters/second. Thus the speed of ...
*Monday, August 21, 2006 at 9:12pm by Anonymous*

**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**

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**

A cart starts from position 4 (which is 20m above ground) in the figure below with a velocity of 11 m/s to the left. Find the speed with which the cart reaches positions 1, 2, and 3. Neglect friction. speed at position 1 m/s? speed at position 2 m/s? speed at position 3 m/s? ...
*Monday, February 27, 2012 at 12:48am by Jacky*

**physicsss**

A Thompson’s gazelle can reach a speed of 13 m/s in 3.0 s. A lion can reach a speed of 9.5 m/s in 1.0 s. A trout can reach a speed of 2.8 m/s in 0.12 s. Which animal has the greatest acceleration?
*Thursday, October 28, 2010 at 3:56pm by Jay*

**Maths**

The braking distance of a car is directly proportional to te square of it's speed. When the speed is p metres per second, the braking distance is 6m. When the speed is increased by 300%, find (a) an expression for speed of the car (b) the braking distance (c) the % increase in...
*Friday, October 21, 2011 at 6:48am by StuartKess*

**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*

**Science**

Well, I agree because it says changes and the cat changed direction twice, once to turn around and once to go from horizontal speed to vertical speed, thereby changing velocity without much change in speed.
*Monday, March 3, 2014 at 2:27pm by Damon*

**Math**

An aircraft flew 3hrs with the wind. The return trip took 4hrs against the wind. If the speed of the plane in still air is 180mph more than the speed of the wind, find the wind speed and the speed of the plane in still air.
*Tuesday, September 27, 2011 at 11:34pm by Ingrid*

**physics**

if a stone at the end of a string is whirled in a circle, the inward pull on the stone A) is known as the centrifugal force B) is inversely proportional to the speed of the object C) is inversely proportional to the square of the speed D) is proportional to the speed E) is ...
*Monday, May 28, 2012 at 9:58am by star*

**Intermediate algebra**

Hello, I am kind stuck on this question In the lab you discover a relationship between the temperature of the air and the speed of sound. You find the speed of sound is never lower than 331 m/s and increases by 60% of the current temperature. a. What is the equation from this ...
*Monday, November 28, 2011 at 9:55pm by Jennifer*

**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**

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*

**10th grade Academic Math**

hi can you help me with this problem please, thank you.----------------- If the speed of an experimental car is decreased by 8km/h it completes a 140 km trip in 2 hours more than had it been traveling at its usual speed. Determine its usual speed.
*Monday, June 7, 2010 at 6:41pm by Neil*

**10th grade Academic Math**

hi can you help me with this problem please, thank you.----------------- If the speed of an experimental car is decreased by 8km/h it completes a 140 km trip in 2 hours more than had it been traveling at its usual speed. Determine its usual speed.
*Monday, June 7, 2010 at 7:19pm by Neil*

**10th grade Academic Math**

hi can you help me with this problem please, thank you.----------------- If the speed of an experimental car is decreased by 8km/h it completes a 140 km trip in 2 hours more than had it been traveling at its usual speed. Determine its usual speed.
*Monday, June 7, 2010 at 7:29pm by Neil*

**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*

**science**

Thank you. I don't know if this one is right- At the speed of 2.5m/s, how many seconnds will it take the kayak to run a 4,500 m course? what is the speed of the kayak in kilometers per hour? speed= 4,500km/2.5h*60min/1 h =270,000/2.5=108,000km/h Thank you Ms. Sue :-)
*Wednesday, March 9, 2011 at 1:20pm by Annie*

**physics**

4 m/s is a very slow pitch. It is only 8.95 mph. A ball thrown at that speed would not make it to the batter's box without rolling there. Are you sure you copied the problem correctly? A good pitcher throws fast balls over 90 mph. Average speed while throwing = 2 m/s. Time = ...
*Thursday, June 23, 2011 at 1:33am by drwls*

**Math Ms. Sue please help**

speed of plane in still air --- x mph speed of wind ------------ y mph so going with the wind, speed = x+y against the wind, speed = x-y x+y = 158 x-y = 112 add them 2x = 270 x = 135 then 135 + y = 158 y = 23 speed of wind is 23 mph, speed of plane in still air = 135 mph
*Thursday, February 28, 2013 at 9:11pm by Reiny*

**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*

**Algebra**

During the first part of a trip, a canoeist travels 57 miles at a certain speed. The canoeist travels 13 miles on the second trip at a speed 5 mph slower. The total time for the trip is 5 hrs. what was the speed on each part of the trip? The speed on the first part is? The ...
*Sunday, April 22, 2012 at 3:36pm by Stella*

**Algebra 1**

if emily's speed is s and the river current speed is r, 1(s+r) = 6 2(s-r) = 6 s + r = 6 2s - 2r = 6 4s = 18 s = 4.5 r = 1.5 So, Emily's speed is 4.5 mph Ashley's speed is 5.5 mph The river's speed is 1.5 mph Rowing separately, Emily's time is 6/(4.5+1.5) + 6/(4.5-1.5) = 3 ...
*Tuesday, May 7, 2013 at 10:49am by Steve*

**physics**

A 9.00 kg object starting from rest falls through a viscous medium and experiences a resistive force = -b , where is the velocity of the object. The object reaches one half its terminal speed in 5.54 s. (a) Determine the terminal speed. (b) At what time is the speed of the ...
*Thursday, March 3, 2011 at 7:36am by kia*

**physics**

A .50kg ball is rolling on a frictionless surface at a speed of .75m/s. it collides with a second ball with a mass of 1kg which is also moving in the same direction as the first ball with a speed of .38m/s. After the collision the firt ball continues at a reduced speed of .35m...
*Saturday, March 26, 2011 at 5:44pm by Mari*

**physics**

A 0.43 kg object connected to a light spring with a spring constant of 21.4 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the mass. (b) Determine the speed of the mass when the ...
*Sunday, October 21, 2012 at 9:57pm by roro*

**Physics**

The average speed does not give the real average. You would need to take the harmonic mean of the speed, i.e. mean speed = 1/(1/4.7 + 1/2.8)/2= 3.5 m/s You can also find the average speed by assuming a distance of one (metre). Total distance = 2 Total time = 1/4.7 + 1/2.8 = 0....
*Thursday, October 8, 2009 at 12:55pm by MathMate*

**waves and optics**

Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons passing through water with ...
*Sunday, May 27, 2012 at 6:42pm by jennifer*

**physics**

9 rev/sec = 18 pi radians/sec. That is called tha angular speed, and usually has a symbol omega. Here, we often use w. You need to provide a dimension along with the "diameter" number. Multiply half the diameter (the radius) by the angular speed in radians per second to get ...
*Thursday, March 3, 2011 at 8:48am by drwls*

**PHYSICS 3**

A solid disk (mass = 1 kg, R=0.5 m) is rolling across a table with a translational speed of 9 m/s. a.) What must the angular speed of the disk be? rad/s d.) The disk then rolls up a hill of height 2 m, where the ground again levels out. Find the translational and rotational ...
*Monday, October 20, 2008 at 4:34am by kelsey*

**Physics**

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.20x10^4 rad/s to an angular speed of 3.14x10^4 rad/s. In the process, the bit turns through 1.92x10^4 rad. Assuming a constant angular acceleration, how long would it take the bit to reach ...
*Tuesday, October 23, 2012 at 8:38am by Sam*

**Math**

let the speed of the river current be x mph speed going upstream = 9 -x mph speed going downstream = 9 + x mph 10/(9-x) = 20/(9+x) 90 + 10x = 180 - 20x 30x = 90 x = 3 the speed of the river is 3 mph
*Monday, April 14, 2014 at 10:00pm by Reiny*

**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*

**Math**

Let x = speed of A and x + 80 = speed of B. Speed = distance/time. therefore Distance = speed * time Distance traveled by A + distance traveled by B = 3200 This should help you solve your problem. Thanks for asking.
*Tuesday, October 16, 2007 at 8:47pm by PsyDAG*

**physics**

A hockey puck moving due east with speed 1.00 m/s collides with an identical puck moving 40 degrees south of west with speed 2.00 m/s. After they collide, the first puck is moving south with speed 1.50 m/s. What is the direction and speed of the second puck?
*Thursday, September 16, 2010 at 4:58pm by Jess*

**math**

speed of boat in still water ---- x km/h speed of current ----- 2 km/h speed against current = x-2 speed with the current = x+2 time upriver = 12/(x-2) time downriver = 12/(x+2) equation: 12/(x-2) + 12/(x+2) = 2.5 hint: multiply both sides by (x+2)(x-2), simplify and you have ...
*Friday, October 15, 2010 at 11:21pm by Reiny*

**MATH**

1. speed of boat in still water --- x mph speed of current ---- y mph 10(x+y) = 210 ----> x+y = 21 70(x-y) = 210 ----> x-y = 3 add them 2x = 24 x=12 then y = 9 speed of boat = 12mph , speed of current = 9 mph #2 even easier .... define x and y as above x+y = 158 x-y = ...
*Monday, August 27, 2012 at 8:40am by Reiny*

**Physic**

Car Speed=100km/h=100000m/3600s=27.8m/s Truck Speed =(50/100) * 27.8=13.9 m/s. V^2 = Vo^2 + 2a*d a = (V^2-Vo^2)/2d a = (0-(27.8-13.9)^2)/400 = -0.483 m/s^2 NOTE: The effective speed of the car is less than the actual speed, because the truck is moving forward.
*Wednesday, August 28, 2013 at 6:03pm by Henry *

**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**

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*

**physics....**

Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons passing through water with ...
*Thursday, June 21, 2012 at 10:58pm by matin*

**Science**

What is the distance an object travels per unit of time? It's called the speed Depends on the velocity (speed), if the speed is 10mph, then the object would travel 10 miles (distance) per hour (unit of time). I'm unsure what your answer is saying, because velocity and speed ...
*Monday, September 18, 2006 at 10:17pm by Ginger*

**Physics**

A centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration. If a point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed, how many revolutions does the...
*Sunday, June 24, 2012 at 7:12pm by Bloom*

**Math**

I come up with 8. Toyota: 2 options: 5-speed or automatic (both with no trunk) Mazda: 2 options: 5-speed w/trunk loaded; 5-speed w/trunk empty Honda: 4 options: 5-speed w/trunk loaded 5-speed w/trunk empty automatic w/trunk loaded automatic w/trunk empty I lost you when you ...
*Wednesday, May 21, 2008 at 12:00am by drwls*

**math - incomplete**

speed increases at a rate of 1.2m/s/? If the speed increases, the value (m/s) increases by 1.2m.s every how often? acceleration is not measured as m/s. It looks to me like you should have written the acceleration is 1.2m/s^2, and you want to find how long it takes the speed to...
*Saturday, August 4, 2012 at 4:09am by Steve*

**science (motion)**

Your movement relative to the bus is the speed of your walking. Relative to the ground, it would be the difference between your speed and the speed of the bus. I hope this helps. Thanks for asking.
*Tuesday, April 28, 2009 at 7:18pm by PsyDAG*

**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**

Car A and B are passing each other in different lanes. Car A has an initial speed of 15m/s and is gaining speed at 1.5m/s^2. Car B has an initial speed of 20m/s and is gaining speed at 2.0m/s^2. Find when and where the cars will pass one another and their speeds as they are ...
*Wednesday, February 20, 2008 at 8:02am by Anonymous*

**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*

**Physics**

a steel ball drops onto a thick steel plate. its speed just before it hits is 10 m/s and it rebounds with a speed of 9 m/s. what percentage of its kinetic energy did it lose during the collision? what would you expect its speed to be after the second rebound?
*Thursday, September 6, 2012 at 7:29pm by Megan*

**Maths**

u = boat speed u-3 = upstream speed u+3 = downstream speed distance = speed * time 35 = (u-3) * 5/6 210 = 5u - 15 225 = 5u 45 = u downstream, 35 = 48 * t t = 35/48 t = 0.729 hr = 43min 45 sec
*Thursday, October 6, 2011 at 7:52pm by Steve*

**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**

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**

An oscillating pendulum, or anything else in nature that involves "simple harmonic" (sinusoidal) motion, spends 1/4 of its period going from zero speed to maximum speed, and another 1/4 going from maximum speed to zero speed again, etc. After four quarter-periods it is back ...
*Tuesday, February 19, 2008 at 11:04am by drwls*

**physics**

The figure below shows the speed of a person's body as he does a chin-up. Assume the motion is vertical and the mass of the person's body is 73.4 kg. Determine the force exerted by the chin-up bar on his body at the following times. t=0s, speed= 0cm per second; t= .5s, speed= ...
*Sunday, October 10, 2010 at 12:30am by Amber*

**physics**

With no river flow, the boat crosses the river at 90/4 = 22.5 meters/min. With river flow, it's speed relative to water is the same as above, but it crosses at a speed of 90/5 = 18 m/min, relative to and perpendicular to the shore. Consider the vector right triangle with sides...
*Thursday, December 27, 2012 at 10:48pm by drwls*

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