Race Definition and 226 Threads

Two objects travel from point A to B. They start with the same speed. 1. The first object travels without any obstacles from A to B. 2. The second object encounters at the middle of the course a planet without an athmosphere. The planet has a tunnel (don't ask why) through which the object...

2) If Neanderthals and Early homo sapiens (Cro- Magnon) could interbreed why are neanderthals considered a different (sub)species and not simply a race?

Homework Statement Hi all, I race bikes in my spare time and someone asked this on a cycling forum: How much time could you save on a 40km race on a flat course, riding at 40km/h if your bike was one pound lighter. Let's say the weight of the rider and bike together is 80kg. There was a time...

Homework Statement On a banked race track, the smallest circular path on which cars can move has a radius of 116 m, while the largest has a radius of 153 m, as the drawing illustrates. The height of the outer wall is 11.6 m. Find (a) the smallest and (b) the largest speed at which cars can move...

Homework Statement A car starts from rest and accelerates uniformly at 3.0 m/s2. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at 5.0 m/s2. How long does it take the second car to overtake the first car? Homework EquationsThe Attempt at a Solution So let...

3.82 in an air race, an aircraft flies from a point directly above Metropolis to a point directly city aniba Gothic, turn and return at starting point. The speed of the aircraft with respect to the air is constant in all the flight and equal to v. city is Gothic a distance D to the East of...

Hi! How shall I correctly describe the velocity, as function of time, for an object put in a stream of e.g. water? My friend wanted to challenge me in the game where a stick is thrown in the water and the winner is that who's stick first reaches a certain point. Ofcourse I picked a stick...

Homework Statement Out of these various shapes: a wooden disk, a modified wooden disk with four pieces of metal in the middle, a smaller metal disk, a metal hoop, a small metal sphere, and a cart with four small wheels, who will win in a race rolling down a ramp with height h and angle Θ? An...

Imagine two light rays parallel to each other , one of them is traveling in vacuum and the other one in water. We place a detector at the same distance from the source and fire the two rays inside their respective media.who will win the race? Or is it possible to have a tie in the competition?

In trying to understand relativity, I once read a statement that even traveling at the speed of light, an emitted photon traveling in your direction would still move away from you at the speed of light. This confuses me as I have a hard time correlating it to a real scenario. Say "The Flash"...

Homework Statement A speedy tortoise can run with a velocity of 01m/s and a hare can run 2.0m/s . In a race , the hare gives the tortoise a 2- minute head start. The tortoise wins the race by a shell ( 0.2m ) . What was the length of the race ? Homework Equations D =v/t , 20minute = 120 sec...

Homework Statement Runners A, B, and C run a 100-m race, each at a constant speed. Runner A takes first place, beating runner B by 10 m. Runner B takes second place, beating runner C by 10 m. By what time interval does runner A beat runner C? Homework Equations d = 100 m Δd = 10...

Homework Statement "In a drag race a car starts at rest and attempts to cover 440 yd in the shortest possible time. The world record is 5.637s; the final speed was 250.69 mi/h at the 440 yd mark" a)What was the average acceleration? b)Prove that the car did not move with constant...

Homework Statement You run a race with your friend. At first you each have the same kinetic energy, but then you find that she is beating you. When you increase your speed by 21%, you are running at the same speed she is. If your mass is 81 kg, what is her mass? Your mass: 81kg Your speed is...

Homework Statement The Track for this racing event was designed so that riders jump off the slope at 30°, from a height of 1m. During a race it was observed that the rider shown in Fig. 2 remained in mid air for 1s. Determine, 1) the speed at which he was traveling off the slope, ( 2points)...

Homework Statement Three uniform objects: a ring, a disk, and a sphere all have identical masses and radii. They are released simultaneously from the top of a ramp 3.80 meters in LENGTH. If the ramp is inclined at θ= 17.0°, use conservation of energy to calculate the linear speed of the ring...

http://www.latimes.com/news/local/la-me-0126-compton-20130126,0,977110.story Is this the future of race relations in America. Has the melting pot been shattered.

Homework Statement A 990-kg race car can drive around an unbanked turn at a maximum speed of 42 m/s without slipping. The turn has a radius of 140 m. Air flowing over the car's wing exerts a downward-pointing force (called the downforce) of 12000 N on the car. (a) What is the coefficient of...

Hi all, Recently, I've been thinking about incomes and expenses in a decent life (for generations after generations). I've made a few observation that each year more and more scientists, engineers, lawyers, bankers, businessmen are employed in our economy. And also a majority of them already...

http://www.huffingtonpost.com/2012/10/01/maine-election-2012_n_1929500.html?utm_hp_ref=politics Getting flyers supporting the Democrat? Sent by the GOP?! It's happening.

Hey there guys, I remembered one stormy night while playing Atari racing game with my son..he asked me: "what is faster force of light?" I escaped with a reply .. "flash first..thunder later" .Suddenly the power was out. My kid went to fetch the flashlight and said to me.."look! push first...

Ok, so here is my question In grade school we all learned that the shortest distance between two points is a straight line. We also know from intuition that cars can't withstand infinite amounts of radial or tangential acceleration otherwise the car will skid i.e traction circle. Via this...

Hi, I'm new to the physics realm and have been out of school for quite some time, and am having difficulties on what most would consider trivial. If anyone has any insight on the following question, as to how I would proceed with it and which equations to use, it would be greatly appreciated...

A sailboat race course consists of four legs defined by the displacement vectors A, B, C and Dshown above. The values of the angles are Θ1 = 35.00, Θ2 = 34.00, andΘ3 = 20.00. The magnitudes of the first three vectors are A = 3.0 km, B = 5.0 km and C = 4.5 km. The finish line of the course...

Hi guys, sorry because I am quite confused. If a person runs a quartermile circular race track for 8 laps for 25.0 min, what is the average speed? What is the average velocity? Does that mean that the average velocity is zero m/s? Because the runner ends on the point where he started...

your view on "race" anthropologist have debated this for years... is there such thing as "race" are people different races are mongolians, caucasians, africans different to an extend that they would be classified as a different "race" or is "race" just a social construct is there...

I've recently been reading some articles and discussions: http://www.usatoday.com/news/education/story/2011-12-03/asian-students-college-applications/51620236/1 http://talk.collegeconfidential.com/college-admissions/1228264-race-college-admission-faq-discussion-9-a.html...

Homework Statement Can anyone explain the above concept in a concise manner? I am proposing that banking aids motion at maximum speed on a curved surface. I am not totally sure how to include the role of side friction and centripetal force. Any further suggestions would be appreciated...

Hi Guys help me out in understanding about the forces that will act on a wheel hub, which serves as a interconnector between the chassis and the wheel.This hub is for a race car. It holds the brake disc at one end and tire at the other end. I wish to analyse the hub for the stress...

A race car driver must average 200.0 km/h over the course of a time trial lasting ten laps. If the first nine laps were done at 198.0 km/h , what average speed must be maintained for the last lap? Avg Speed=Distance traveled/Time 218 km/h, I averaged the first 9 laps at 198 and plugged the...

http://www.foxnews.com/on-air/oreilly/2012/05/08/national-media-ignoring-norfolk-case Short version. One of five people (black) hits a vehicle driven by two local reports (white, man and woman). The driver stops and confronts the person. The five proceed to beat the two, while 30 or so other...

I've looked at lot of information on the net and have picked up a few things. My query is how to work out the optimum radius and measurements for the lead into an intake on a racing jet boat? We cruedly term it the 'spoon effect' where the water runs along the bottom of the boat and up into...

a sphere and a hoop both of same mass (e.g. 'm') roll down an inclined plane without slipping...which will get to the bottom first..will they have equal kinetic energies when they reach the bottom?

In the last year or so, there has been a breeder arms race to produce the hottest pepper. The peak has gone up a little over 1 million scoville to over 1.5 million scoville in a short time. Since pure capsaicin is 16 million scoville, there is a well defined upper limit. I don't know the...

Homework Statement The tortoise challenged the hare to a race in the woods. The fox is the judge and he stood still. The rabbit started the race 6 minutes after the turtle. The fox said that the turtle won the race after 20 minutes and that the hare arrived 1 minute after the hare. But the...

So i got this little problem for homework i honestly don't know how to start figuring anything out... but please can i get a hint? xD A______________________________B___________________C |--------------Xb=?----------------| |----------------------------400 m------------------------| In a...

1. A man is driving his new sports car at 120km/h while a girl is parked at a red light. At the moment the man passes the girl, the light turns green and the girl pulls away at the same time as the man passes. The girl accelerates at 45km/h. A) How long will it take the girl to catch the man...

Homework Statement In Formula 1 race, the cars approach curves from the outside, cut through to the inside, and then drift again to the outside (red path AA’ in the figure). However, the blue path (BB’) in the figure is shorter. Then why do not the drivers follow the shortest path? Give...

The Republican primary race (between the states, not between the candidates) heats up: New Hampshire primary could be early December (cnn.com)

Homework Statement A race car travels 100 m/s around a circular track of radius 167 m. What is the magnitude of the resultant force on the 1300 kg driver and his car if the car does not slip? Coefficient of static friction = 0.1 21 degrees Homework Equations The Attempt at a...

I thought Penguino, Evo and others might enjoy this amazing performance of an excerpt from Mark Twain's essay: "The Damned Human Race". It's just a rant, but so entertainingly done I could say it's a demonstration of "The Art of Rant". https://www.youtube.com/watch?v=F_rTMNnxwSE

Homework Statement You nose out another runner to win the 100.000 m dash. If your total time for the race was 11.800 s and you aced out the other runner by 0.001 s, by how many meters did you win? Homework Equations a = v-v0 / t The Attempt at a Solution So i found the acceleration...

Finding http://www.youtube.com/watch?v=1Mt31BAEwto&feature=related" and moving beyond them, would you ? That is by far the sickest challenge I have ever heard of, leave it to a bunch of Yankee's from the Berkshires to dream up something like this. Rhody... :cry: :cool:

Homework Statement What is the average velocity of a runner whose 400 meter lap times are 60, 75, 65 and 60 seconds over a 1500 meter race? Homework Equations The Attempt at a Solution Is I use v=d/t (would the displacement be 0m beacuse he completed 1 lap? Im a bit...

If we where to make a wireless phone call to a planet 1 light year away the lag/time delay would be 1 year. They would have to wait 1 year to hear what we say today. But if we used a long (long is an understatement) piece of wire connecting the 2 phones, what kind of delay would there be...

Why are biracial people who have one African parent or decadent always considered black. why does black seem to override all other races

Homework Statement Contador climbs a 5 degree section of road for 8.2 km to the summit in 20 minutes 35 seconds. he is 62kg? his bike is 8kg and the resistance force is 21 N What is the applied force needed for contador to move at constant speed? what is the work done to reach the...

I need some help guys. I'm going to make a set of 180 degree race headers for a (600 h.p., 607 lbs./ft.) FE 428 CJ. and I need real facts - no guesswork. Material is polished 304, 2" O.D. stainless steel. I believe the engine firing order is: 1,5,4,2,6,3,7,8. What is the correct cylinder...

This thread is to assist the racer or inquiring mind regarding the whys and hows of chassis set-up. Where possible, the applicable principle of Physics should be noted. Any inquiry should include a short, concise problem statement along with as much background information as practical. I have...

Homework Statement OK, so spaceship A and spaceship B are at the same location. Spaceship A sets off (instantaneously) at a speed vA\approxc, traveling in a straight line towards the finish line, which will take him a time tA. After a time \frac{tA}{2} (in spaceship B's frame of...