Search: speed

Number of results: 21,581

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

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

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
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

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...
Sunday, March 4, 2012 at 3:19pm by Jake

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

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

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
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

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 ...
Monday, October 3, 2011 at 1:21am by Steve

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

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

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
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

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 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

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

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

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

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
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

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 ...
Monday, August 21, 2006 at 9:12pm by Anonymous

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

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 ...
Thursday, May 2, 2013 at 10:26pm by Kathy

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

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

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

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 % ...
Friday, October 21, 2011 at 6:48am by StuartKess

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

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

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) + ...
Tuesday, May 7, 2013 at 10:49am by Steve

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
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

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

Algebra
Distance = Speed/time = 40/(2/3) = ? ?D = Speed/(1/2) Calculate for distance, then speed.
Wednesday, December 5, 2012 at 4:14am by PsyDAG

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

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

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

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
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

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
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

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
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....
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

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
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

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

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

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

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 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

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
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
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 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 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 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

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 ...
Monday, August 27, 2012 at 8:40am by Reiny

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

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...
Thursday, March 3, 2011 at 8:48am by drwls

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

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
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 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

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 ...
Monday, September 18, 2006 at 10:17pm by Ginger

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 ...
Thursday, December 27, 2012 at 10:48pm 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 - 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
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
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
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

Radians
rim speed=angular speed*radius rim speed=50rev/min*2PIrad/1rev*15cm = 4700cm/min
Tuesday, April 5, 2011 at 9:47pm by bobpursley

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

MATH
Well, obviously the speed of the plane must be greater than the speed of the wind, so in x-y = 112 x must be the plane's speed and y the wind's speed so sub y = 23 into x+y = 158 x+23=158 x = 155
Monday, August 27, 2012 at 8:40am by Reiny

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

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
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
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 ...
Tuesday, February 19, 2008 at 11:04am by drwls

How far behind?
Need to know how far behind runner A is at 9 km then figure time for leader to run the last km at 9 km /35 min rate In that time A mus increase speed so that he covers 1 km plus the distance behind in that time his average speed is then (1 + distance behind)/time for leader to...
Saturday, January 10, 2009 at 7:10pm by Damon

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

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

math
let speed of boat in still water be x mph upstream: speed = x-5 time = 36/(x-5) downstream: speed = x+5 time = 54/(x+5) the two times are equal, so 36/(x-5) = 54(x+5) 54x - 270 = 36x + 180 18x = 450 x = 25 The speed of the boat without a current is 25 mph
Tuesday, August 2, 2011 at 8:51pm by Reiny

maths
A man travels from town a to b at an average speed of 90km/h.on his return journey he takes (one)1 hour less and his speed is 10km/h faster......1.how far apart are towns a and b, ............. ..2.what Is his average speed from town a to b and back to a ..
Thursday, April 11, 2013 at 3:08pm by mohammed

physics
A supersonic jet flying at 137 m/s is accelerated uniformly at the rate of 23.1 m/s2 for 20.0 s. (a) What is its final velocity? (b) The speed of sound in air is 331 m/s. How many times the speed of sound is the plane's final speed?
Tuesday, October 23, 2012 at 9:24pm by miranda

physics
Tarzan swings on a 34.0-m-long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest? m/s (b) What is his speed at the bottom of the swing if he pushes off with a speed of 5.00 m/s? m/s
Wednesday, October 10, 2012 at 11:25pm by monic

Physics
Tarzan swings on a 27.0 m long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest?(b) What is his speed at the bottom of the swing if he pushes off with a speed of 3.00 m/s?
Wednesday, March 10, 2010 at 1:25pm by Kelsey

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...
Sunday, October 10, 2010 at 12:30am by Amber

algebra1
the speed of train A is 8mph slower than the speed of train B. Train A travels 220 in the same time it takes train B to travel 260 miles. Find the speed for each train.
Sunday, October 18, 2009 at 11:19pm by mark

physics
Calculate the magnitude of the linear momentum for the following cases. (a) a proton with mass 1.67 10-27 kg, moving with a speed of 4.00 106 m/s (b) a 16.5 g bullet moving with a speed of 270 m/s (c) a 70.5 kg sprinter running with a speed of 12.5 m/s (d) the Earth (mass = 5....
Monday, July 7, 2008 at 9:31am by Elisa

physics
A 0.55 kg object connected to a light spring with a force constant of 20.0 N/m oscillates on a frictionless horizontal surface. If the spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the object. (b) Determine the speed of the object when ...
Wednesday, June 29, 2011 at 2:38pm by Sarah

physics
A passenger on a stopped bus notices that rain is falling vertically just outside the window. When the bus moves with constant velocity, the passenger observes that the falling raindrops are now making an angle of 18 with respect to the vertical. What is the ratio of the speed...
Monday, September 5, 2011 at 4:42pm by cassie

science
The true speed of a moving car on the Earth, if you want to be very precise, would be the speed of the car with respect to the ground Is this true? yeah it is true yeah it is true The true speed of a moving car on the Earth, if you want to be very precise, would be the speed ...
Thursday, May 10, 2007 at 11:27am by Haley

math
A cyclist bikes at a constant speed for 18 miles. He then returns home at the same speed but takes a different route. His return trip takes one hour longer and is 23 miles. Find his speed.
Monday, July 23, 2012 at 12:00am by john

Calculus/Vectors
An airplane heads due south with an air speed of 480km/h. Measurements made from the ground indicate that the plane's ground speed is 528km/h at 15 degrees east of south. Calculate the wind speed.
Monday, May 2, 2011 at 4:07pm by Anonymous

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