Friday
January 30, 2015

Search: speed

Number of results: 21,160

Physics
A car drives up a straight hill at a constant speed of 60 kilometers per hour. A truck drives over the crest of the hill at a constant speed of 60 miles per hour. What is the net force on the car and on the truck? 1. both not zero 2. not zero; zero 3. both zero 4. zero; not zero
October 13, 2011 by Mathew

Phys
i cant get this no matter what i try; A curve of radius 40 m is banked so that a 1070 kg car traveling at 60 km/h can round it even if the road is so icy that the coefficient of static friction is approximately zero. The acceleration of gravity is 9.81 m/s a)Find the ...
March 2, 2011 by HELP JOHN

physics help please please please!!!
A spaceship lands on a new planet. the crew decides to measure the speed of sound in the planets atmosphere. taking a tube with a length of 50 cm, they find that one resonant frequency occurs at 2,520 Hz, and the next resonant frequency at 2,940 hz. what is the speed of the ...
December 8, 2014 by Kayla

physic HELP
On a banked race track, the smallest circular path on which cars can move has a radius r1 = 106 m, while the largest has a radius r2 = 153 m, as the drawing illustrates. The height of the outer wall is 18 m. Find the smallest speed at which cars can move on this track without ...
December 20, 2010 by jessica

Physics
On a banked race track, the smallest circular path on which cars can move has a radius of 119 m, while the largest has a radius 155 m, as the drawing illustrates. The height of the outer wall is 18 m. (a) Find the smallest speed at which cars can move on this track without ...
October 6, 2012 by Moises

Physics (Rotation)
In Fig. 10-28, wheel A of radius rA is coupled by belt B to wheel C of radius rC. The angular speed of wheel A is increased from rest at a constant rate α. Find the time needed for wheel C to reach angular speed ω assuming the belt does not slip. (Hint: If the belt ...
March 2, 2012 by M

physics!!!
A copper rod is given a sharp compressional blow at one end. The sound of the blow, traveling through air at -2.79 degrees Celsius, reaches the opposite end of the rod 9.39ms later than the sound transmitted through the rod. What is the length of the rod? The speed of sound in...
November 8, 2010 by Ashleigh

Physics
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
October 17, 2013 by Anonymous

physics
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
October 17, 2013 by Anonymous

PHYSICS(HELP)
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
October 18, 2013 by Anonymous

physics
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
October 18, 2013 by Anonymous

PHYSICS(HELP)
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead ...
October 19, 2013 by michael

PHYSICS (HELP)
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
October 21, 2013 by Anonymous

Math
A car traveled 281 miles in 4 hours 41 minutes. What was the average speed of the car in miles per hour? 4 hours 41 minutes = 4 60 + 41 = 281 minutes Average speed S is given by distance/ time. S = 281 miles/281 minutes =1 mile/minute = 60 miles/hour
April 26, 2012 by Rezu

physics
A glider with a mass of 3 kg is moving rightward at a speed of 2 m/s on a frictionless horizontal air track. It collides with a stationary glider whose mass is 18 kg. If the collision is elastic, what is the speed of the gliders after the collision? Use SI units in your answer...
March 12, 2014 by Anonymous

MATH
How can solve this? help For one pony, the critical force was 1.16 times its body weight. It experienced a force of 0.75 times its body weight at a speed of 2 meters per second, and a force of 0.93 times its body weight at 3 meters per second. At what speed did the pony switch...
January 28, 2012 by aryan

Physics
In a playground, there is a small merry-go-round of radius 1.20 m and mass 190 kg. Its radius of gyration (see Problem 85 of Chapter 10) is 91.0 cm. A child of mass 44.0 kg runs at a speed of 4.50 m/s along a path that is tangent to the rim of the initially stationary merry-go...
October 26, 2009 by Ray

physics
An unstable atomic nucleus of mass 17.0 10V27 kg which is at rest disintegrates into three particles. One of the particles, of mass 5.00 10V27 kg, moves in the y direction with speed 4.50 Mm/s. Another, with mass 8.40 10V27 kg, moves in the x direction with speed ...
March 28, 2011 by Matthew

Physics
A soccer ball is kicked with an initial horizonal velocity of 18 m/s and an initial vertical velocity of 18 m/s. 1) What is the initial speed of the ball? 2)What is the initial angle of the ball with respect to the ground? 3)What is the maximum height the ball goes above the ...
September 29, 2011 by Aziz

PHYSICS
A tuning fork of frequency 558 Hz is placed near the top of the pipe shown in the Figure. The water level is lowered so that the length L slowly increases from an initial value of 20.0 cm. Determine the next two values of L that correspond to resonant modes. (Assume that the ...
June 18, 2007 by JAY

physics
need help on this three part one its about inelastic collisions momentum and energy related with work Find the speed at which Superman (mass=76.0 kg) must fly into a train (mass = 17620 kg) traveling at 60.0 km/hr to stop it. Running into the train at that speed would severely...
February 26, 2008 by kdhgwiu

Physics
A 343-kg boat is sailing 16.2 north of east at a speed of 1.98 m/s. Thirty seconds later, it is sailing 37.5 north of east at a speed of 3.76 m/s. During this time, three forces act on the boat: a 30.3-N force directed 16.2 north of east (due to an auxiliary engine), a 22.3...
February 9, 2012 by Natasha

physics
A spacecraft of mass is first brought into an orbit around the earth. The earth (together with the spacecraft) orbits the sun in a near circular orbit with radius ( is the mean distance between the earth and the sun; it is about 150 million km). (a) What is the speed (in m/s) ...
November 22, 2013 by juanpro

physics
In many countries, automatic number plate recognition is used to catch speeders. The system takes a time-stamped license plate photo at one location (like an on-ramp to a freeway), and then takes a second time-stamped photo at a second location a known distance from the first ...
September 1, 2012 by Natasha

physics
A ball is thrown upward from the top of a 27.0-m-tall building. The ball's initial speed is 12 m/s. At the same instant, a person is running on the ground at a distance of 31.2 m from the building. What must be the average speed of the person if he is to catch the ball at the ...
May 13, 2007 by micole

physics
The speed of sound in air varies with the temperature and humidity of the air. In dry air at 20 degrees Celsius, the speed of sound is approximately 343 m/sec. A closed tube resonates with a node at each end for a sound wave in air. What is the length of tube you would choose ...
February 19, 2014 by Ann

science
A big plane mirror is fixed vertically on the back of bicyce. A boy standing in front of the mirror can see his image clearly in the plane mirror. The bicycle starts moving with the sepeed of 6 ms1 and the boy also starts running with 4 ms1 in the direction of bicycle motion...
January 9, 2012 by PRAMIT

science
A big plane mirror is fixed vertically on the back of bicyce. A boy standing in front of the mirror can see his image clearly in the plane mirror. The bicycle starts moving with the sepeed of 6 ms1 and the boy also starts running with 4 ms1 in the direction of bicycle motion...
January 9, 2012 by aaaa

physics
When Mary is 22 m from the finish line, she has a speed of 4.0 m/s and is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of 0.51 m/s^2 to the finish line. What ...
October 25, 2010 by bob

Math-Algebra
(Engineering) The current / varies as the electromotive force E and inversely as the resistance R. If in a system, a current of 20A flows through a resistance of 20 ohms with an electromotive force of 100V, find the currect that 150V will send throu+gh the system. (Navigation...
December 18, 2013 by McKenna Louise

Chem
is 3.00 x 10^8 m/s the speed of light
November 1, 2007 by Lauren

SCI
How can we to speed up the metabolism
April 25, 2008 by Dawn

physics
What is speed with direction known as
September 5, 2011 by Akhilesh

physics
the speed of 90 hm/hr is equal to.... m/s
May 31, 2013 by arowosafe

physics
the speed of 90 hm/hr is equal to.... m/s
May 31, 2013 by arowosafe

physics please help
The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.030 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.055 kg and is initially at rest. The collision is not head-...
November 7, 2010 by joshua

physics (please help)
Let f be the frequency, v wav the speed, and T the period of a sinusoidal traveling wave. The correct relationship is: a)f=1/T b)f=vwav + T c)f=vwavT d)f=vwav/T e)f=T/vwav My thoughts: Since frequency is equal to T=1/f so f=1/T. Vwav is connected to f by the equation v=lambda...
February 13, 2007 by susan

English
Word box affluence arrears cascade cringe crotchety format immobile impassable innovation jovial manacle martial minimum nimble onset partition perishable retrieve sinister taut The feeling of ____ I had when I was paid lasted only until I had finished taking care of my bills ...
January 15, 2013 by Jerald

physics
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
October 21, 2013 by Anonymous

PHYSICS HELP!!!
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
October 21, 2013 by Anonymous

Physics
4. A basketball is thrown from a height of 1.60(m), with an angle of 45o above the horizontal. (a) With what initial speed must the basketball be thrown so that it reaches the basket at the highest point of its trajectory? The basket is at a height of 3.05(m) above the ground...
February 15, 2014 by maria

pyhsics
A man drops a rock off the side of a cliff, and hears it hit the bottom 2.8 seconds later. If the average speed of sound is 335 m/s, how high is the cliff? I have been able to figure out this much, but I don't know how to solve the problem with the data that I have been given...
October 24, 2014 by JJ

physics
A solid sphere of radius 23 cm is positioned at the top of an incline that makes 23 degree angle with the horizontal. This initial position of the sphere is a vertical distance 3 m above its position when at the bottom of the incline. The sphere is released and moves down the ...
November 27, 2012 by Alyssa

science
As seen in the lab frame a rocket A is moving to the right with speed c  and rocket B is moving to the left with speed c  . The pilot of rocket B fires a laser beam. In the B-frame, the laser beam points in the x-y plane and makes and angle =53.13˚...
March 9, 2014 by Relativity quest. help pls 2

physic
an ideal fluid flows through a pipe hat runs up an incline and gradually rises to a height H. The cross sectional area of the pipe is uniform. compared with the flow at the bottom of the incline, the flow at the top is a) moving slower at lower pressure b) moving slower at ...
January 8, 2012 by john

physics
A 0.060-kg handball is thrown straight toward a wall with a speed of 9 m/s. It rebounds straight backward at a speed of 6.7 m/s (a) What impulse is exerted on the wall? magnitude 0.942 kgm/s (b) If the ball is in contact with the wall for 3.0 ms, what average force is exerted...
November 7, 2011 by Amanda

College Physics Homework. Please help!
A metal bar with a length of 0.30 m and mass of 0.5 kg is free to slide (no friction) on a set of vertical rails. The rails and bar together have a resistance of 500 ohms. The rails lie in a horizontal magnetic field with a strength of 0.04 T. The mass falls under the combined...
May 7, 2012 by Rich

english grammar pls help me to correct my english
kindly pls,can you help me to have a good grammar for this word document I made for my exam below. thanks a lot. my paragraph: The most difficult task in creating word document is to compose according to what a paragraph to be use. Making words correctly but words spelling can...
May 19, 2011 by jessie

Info. Tech (Computer Science)
1.)(a) CPU 1 has speed of 2.6 GH (steps per second) and runs a program which needs 10.9 T steps. (b) CPU 2 has speed of 2.2 GH and runs program which needs 7.3 T steps. ---How long does it take for CPU 1 and CPU 2 to finish the work? (Show all work!) 2.)How many more more 4 ...
November 17, 2010 by Nate

Physics
A ball with a mass of 0.50 kilograms is moving at a speed of 1.8 meters/second along the positive x-axis. It collides with another ball of the same mass travelling at a speed of 2.0 meters/second toward the positive y-axis. Both balls then start moving together. What is the ...
March 13, 2013 by fredrick

Physics
A golf ball is shot from a tee, elevated 20m above the green, with an initial speed of 27m/s at an angle of 50 above horizontal. a) What will be the speed of the golf ball before it hits the green, 20m below it started? b) How much time will it take for the ball to travel ...
October 3, 2014 by Hasini

physics
You testify as an expert witness in a case involving an accident in which car A slid into the rear of car B, which was stopped at a red light along a road headed down a hill (see the figure). You find that the slope of the hill is θ = 14.0, that the cars were separated ...
October 9, 2013 by kristy

physics
A steel tube, which is closed at both ends, is filled with air. The air in the tube is vibrating at a frequency of 200Hz. Use 340m/s for the speed of sound in air. (a) What is the wavelength of the sound waves in the tube? _____ m. (b) If the 200Hz vibration respresents the...
December 8, 2011 by jen

Physics
Two identical dragsters, starting from rest, accelerate side by side along a straight track. The wheels have identical angular acceleration. The wheels on one of the cars roll without slipping, while the wheels on the other slip during part of the time...
April 5, 2008 by James

Physics
The conducting rod ab shown below makes frictionless contact with metal rails ca and db. The apparatus is in a uniform magnetic field of 0.855 T, perpendicular to the plane of the figure. The length L of the rod is 25 cm. (a) Find the magnitude of the emf induced in the rod ...
October 19, 2011 by chloe

Algebra 2
1. During 60mi of city driving, Jenna averaged 15mi/gal. She then drove 140mi on an expressway and averaged 25mi/gal for the entire 200mi. Find the average fuel consumption on the expressway. 2. The excursion boat Holiday travels 35km upstream and then back again in 4h 48min. ...
October 7, 2010 by Jessica

Physics
In the early morning hours of June 14, 2002, the Earth had a remarkably close encounter with an asteroid the size of a small city. The previously unknown asteroid, now designated 2002 MN, remained undetected until three days after it had passed the Earth. Suppose that at its ...
July 30, 2011 by Geek

Physics Classical Mechanics
A bead of mass m slides without friction on a vertical hoop of radius R . The bead moves under the combined action of gravity and a spring, with spring constant k , attached to the bottom of the hoop. Assume that the equilibrium (relaxed) length of the spring is R. The bead is...
October 21, 2013 by Anonymous

Physics
Two 0.4 kg soccer balls collide elastically in a head-on collision. The first ball starts at rest, and the second ball has a speed of 3.5 m/s. After the collision, the second ball is at rest. A.) What is the final speed of the ball? B.) What is the kinetic energy of the first ...
December 17, 2012 by Ana

math
mr.Thomas drove for two days.The first day he drove for 6 hours at an average speed of 55miles per hour. The next day he drove for 7 hours at an average speed of 63 miles per hour. How many miles did Mr.thomas drive during the two days?
March 7, 2011 by Bluestarr

Physics C: Mechanics
A yo-yo has a rotational inertia of 760 gcm2 and a mass of 200 g. Its axle radius is 4.0 mm, and its string is 100 cm long. The yo-yo rolls from rest down to the end of the string. (a) What is the magnitude of its linear acceleration? cm/s2 (b) How long does it take to reach ...
October 26, 2010 by Xavier Hernandez

Physics!!! please help... URGENT
Directions: Consider the following scenarios ignoring the effects of gravity: 1. You are the capitan of a spacecraft traveling in the far reaches of outer space, a great distance from any other body. Unexpectedly your radar indicates a meteor on a collision course with your ...
December 6, 2006 by Kacey

Physics
A hydraulic ram is a device that uses the pressure created by a large amount of water falling a small distance to raise a portion of that water to a much greater height. It is suitable in valleys where springs feed a stream below, where farms needing irrigation are at the top ...
January 31, 2013 by Ravin

physics
A yo-yo has a rotational inertia of 860 gcm2 and a mass of 150 g. Its axle radius is 3.4 mm, and its string is 90 cm long. The yo-yo rolls from rest down to the end of the string. (a) What is the magnitude of its linear acceleration? 1 cm/s2 (b) How long does it take to reach...
January 5, 2011 by Joey

Physics
An elastic collision occurs between two pucks on an air-hockey table. Puck A has a mass of 0.025 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.060 kg and is initially at rest. The collision is not head-on...
October 22, 2012 by Sam

Physics
A billiard ball of mass m = 0.250 kg hits the cushion of a billiard table at an angle of θ1 = 56.2 and a speed of v1 = 24.8 m/s. It bounces off at an angle of θ2 = 71.0 and a speed of v2 = 10.0 m/s. (a) What is the magnitude of the change in momentum of the ...
October 28, 2014 by Anonymous

physics
John and Mary are skating at an ice rink. John skates at a constant speed of 6.7 m/s, with respect to the ice surface, directly south. Mary skates at a constant speed of 11.5 m/s in a direction of 34 west of south, with respect to the ice. What are the magnitude and direction...
January 25, 2015 by Anonymous

Physics (please help!!!!)
A suitcase of weight mg = 450 is being pulled by a small strap across a level floor. The coefficient of kinetic friction between the suitcase and the floor =0.640 a) Find the optimal angle of the strap above the horizontal. (The optimal angle minimizes the force necessary to ...
February 18, 2011 by Catherine

Math
A car is traveling south at a speed of 68 mi/h from Dallas toward San Antonio. Dallas is about 272 miles north of San Antonio. A truck is traveling north from San Antonio to Dallas at a speed of 71 mi/h. When and where will they pass each other? 1. Create a table to record the...
November 13, 2011 by Suchi

Science
A coach wants to find out the speed of the runners on a track team. Tell what simple equiptment the coach needs in order to do this and explain how it should be done. You need to know the time and distance in order to calculate speed. Think of some typical equipment used to ...
January 15, 2013 by Jerald

Algebra
Montreal and Quebec City are about 260km apart along Route 20 in Canada. Sylvia is leaving Montreal to go to Quebec City at a speed of 90km per hour. And Anne is leaving Quebec City to go to Montreal at a speed of 105km per hour. a) When and where do Slyvie and Anne pass each ...
October 27, 2008 by Joy

English
1. After you write short passages about two of your friends, send an e-mail to one of your classmates. The student who gets the e-mail should write a short reply. 2. Read the reading fast, right, and with emotion out loud. After that measure your reading speed. 3. the number ...
March 11, 2009 by John

Physics Classical Mechanics
A body of mass m= 1 kg is moving along the x-axis. Its potential energy is given by the function U(x)=2(x2−1)2 Note: The units were dropped for the numbers in the equation above. You should note that 2 would carry units of J⋅m−4 and 1 would carry units of m2 ...
October 21, 2013 by Anonymous

Physics
You are the juror of a case involving a drunken driver whose 972 kg sports car ran into a stationary 2094 kg station wagon stopped at a red traffic light. The cars stuck together and slid with locked wheels for 11.0 m before coming to rest. The coefficient of sliding friction ...
October 7, 2014 by Katrina

Physics
A small block on a frictionless horizontal surface has a mass of 2.5010−2 Kg. It is attached to a massless cord passing through a hole in the surface. The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 1.75 rad/s. The cord ...
June 25, 2009 by Sarah

Physics
Henrietta is going off to her physics class, jogging down the sidewalk at a speed of 2.05 m/s. Her husband Bruce suddenly realizes that she left in such a hurry that she forgot her lunch of bagels, so he runs to the window of their apartment, which is a height 43.9 m above the...
February 8, 2012 by Bob

physics
John is listening to a horn. He knows the frequency of the horn is 300 Hz when both he and the horn are at rest. If he hears a pitch of 330 Hz, there are clearly several possibilities. For each of the following statements, indicate whether it is correct or incorrect. Both can ...
May 16, 2011 by Joan

physics
Your physical therapist throws a baseball to you at a certain speed and you catch it. To increase the difficulty, the therapist is going to throw you a medicine ball whose mass is ten times the mass of the baseball. You are given the following choices. Rank these from easiest ...
October 15, 2012 by lib

physics
Your physical therapist throws a baseball to you at a certain speed and you catch it. To increase the difficulty, the therapist is going to throw you a medicine ball whose mass is ten times the mass of the baseball. You are given the following choices. Rank these from easiest ...
October 15, 2012 by lib

physics
Your physical therapist throws a baseball to you at a certain speed and you catch it. To increase the difficulty, the therapist is going to throw you a medicine ball whose mass is ten times the mass of the baseball. You are given the following choices. Rank these from easiest ...
October 15, 2012 by lib

physics
please check my answers. 20. does the international space station have gravitational pe? ke? explain? -It has gravitation pe. I thought that Gravitational potential energy is the energy stored in an object as the result of its vertical position or height? 30.a moving hammer ...
October 16, 2007 by jess

physics
A 10 g particle has the potential energy shown in a graph with the y-axis label U(J) and the x axis is labeled in cm. There is a diagonal line from 4 J down to 1 cm and the line levels out on the x axis to 3 cm and rises again to a height of 2 J at 5 cm and levels out to 7 cm ...
December 2, 2009 by Ashley

Physics
A 0.006-kg bullet traveling horizontally with a speed of 1.00 103 m/s enters an 21.1-kg door, imbedding itself 10.4 cm from the side opposite the hinges as in the figure below. The 1.00-m-wide door is free to swing on its hinges. (c) At what angular speed does the door swing ...
March 19, 2010 by Ana

physics
The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.0 m/s, at an angle of 47.0 ...
February 8, 2012 by Natasha

Physics
The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.0 m/s, at an angle of 47.0 ...
February 9, 2012 by Natasha

Physics
The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you lob the ball with an initial speed of 16.5 m/s, at an angle of 52.5 ...
October 22, 2014 by Abigail

physics-energy
HI well i have two questions 1) a 2.0-m-long pendulum is released from rest when the support string is at an angle of 25 with the vertical. what is the speed of the bob at the bottom of the swing? 2)A 2.0*10^3-kg car starts from rest at the top of a 5.0-m-driveway that is ...
November 27, 2006 by becky

Physics... Please help me
A shell is shot with an inital velocity of 20m/s at an angle 60 degrees with the horizontal. At the top of the trajectory, the shell explodes into two fragments of equal mass. One fragment whose speed is immediately after the explosion zero falls vertically. How far from the ...
January 30, 2007 by Brian

physics
Two canoeists start paddling at the same time and head toward a small island in a lake. Canoeist 1 paddles with a speed of 1.40m/s at an angle of 45 degrees north of east. Canoeist 2 starts on the opposite shore of the lake, a distance of 1.5 km due east of canoeist 1. A) In ...
September 24, 2014 by Marissa

physics
One object is at rest and another is moving. The two collide in a one-dimensional, completely inelastic collision. In other words, they stick together and move off with shared velocity. The speed of the object that is moving initially is 25 m/s. The masses of the two objects ...
September 29, 2014 by aithusa20

Math
Jill and Matt run on a 400-meter-long oval track. They each run 10 laps daily and both run in the same lane. One day, they begin at the same point, but ran in opposite directions. Jill ran at a constant speed that was 2 meters per second faster than Matt's constant speed. Jill...
October 22, 2008 by Natalie

Chemistry
A dragster moves at a speed of 225 miles per hour. Express this speed in nanometers per Microsecond. Ok so I've solved this problem like twenty times, each time adding something into the equation or taking something out and I almost got the correct answer, but I was three ...
September 25, 2011 by Bob

mechanics
A skydiver is falling straight downward (prior to having deployed his parachute) when he strikes a woman in a hang glider flying horizontally to the east. The skydiver lands on the glider and grabs hold of it. Just prior to this collision, the glider had a speed of 5ms east ...
July 6, 2014 by juanpro

physics
This is a sample question: A man jogs at a speed of 1.2 m/s. His dog waits 2 s and then takes off running at a speed of 4.1 m/s to catch the man. How far will they each have traveled when the dog catches up with the man? The answer is 3.3931 m. I just need to know the process ...
August 28, 2010 by John

Science
What is the full formula for frequencys and wavelengths? The wavelength formula is λ = v/f where λ = wavelength of a sound wave or electromagnetic wave v = the speed of propagation of the wave, f = frequency of the wave in 1/s = Hz. c=nu*lambda c is speed of light = ...
November 28, 2006 by Brooke

calculus
A man launches his boat from point A on a bank of a straight river, 3 km wide, and wants to reach point B, 2 km downstream on the opposite bank, as quickly as possible. He could row his boat directly across the river to point C and then run to B, or he could row directly to B...
December 4, 2009 by Avilene

Physics
The conducting rod ab shown below makes frictionless contact with metal rails ca and db. The apparatus is in a uniform magnetic field of 0.855 T, perpendicular to the plane of the figure. The length L of the rod is 25 cm. (a) Find the magnitude of the emf induced in the rod ...
July 24, 2011 by Chloe

physics
You let out a shout, echo comes back and reaches you in 1.4 seconds. if the speed of sound in air is 343 m/s, what is the distance to the cliff? a. need assitance in setting up problem? Let d be the distance to the cliff, and V be the speed of sound. The sound must travel a ...
September 3, 2006 by tim

physics
A mass M = 0.464 kg moves with an initial speed v = 2.98 m/s on a level frictionless air track. The mass is initially a distance D = 0.250 m away from a spring with k = 844 N/m, which is mounted rigidly at one end of the air track. The mass compresses the spring a maximum ...
March 24, 2012 by bob please help

math
A stepping motor with 200 steps angles ( = 200) is coupled to a leadscrew through a gear reduction of 5:1 (five rotations of the motor for each rotation of the leadscrew). The leadscrew has 2.4 threads/cm (which means the distance between two adjacent threads is 1 / 2.4 cm). ...
June 20, 2010 by dick

Pages: <<Prev | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | Next>>

Members