Wednesday

December 2, 2015
Number of results: 33,404

**Physics (ASAP)**

Please I need help. I don't know how to do this problem without the SPEED VALUE. 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? _______ kg Thank you.
*May 3, 2013 by Kathy*

**Algebra 2**

The highest speed reached by a solar powered vehicle is 48.71 mph. This record was set by a Sunracycer on June 24, 1988 in Meza, AZ. How far could this car travel in 2.5 hrs at this speed.
*June 15, 2014 by Drew*

**algebra Please Help**

New question: A baseball was 2.74 feet above ground when it was hit. It reached a max. height of 116.3ft when it was approx 215.3 ft away from where he hit the ball. The ball lands after travelling a ground distance of approx 433.1 ft. Find an equation of form y = A(x-h)^2 + k...
*October 9, 2011 by Jennifer*

**Science... plz help~!**

A basketball momentarily changes shape as it bounces off the floor. This is due to balanced forces acting on the ball. (1 point) True*** False A ball slowing down as it rolls across a carpet is an example of (1 point) Balanced force Friction*** Inertia Zero net force If the ...
*March 4, 2014 by Anonymous*

**physics**

The cost of gasoline per hour for running a certain car is directly proportional to the square of the speed. I f the cost is $2.40 per hour for a speed of 40 km/h, what is the cost per hour for a speed of 60 km/h?
*November 22, 2011 by Anonymous*

**Physics**

There's 2. 1) A 1200-kg airplane starts from rest and, with a constant average forward acceleration of magnitude 5.0m/s^2, reaches its take off speed in 9.00 s. The runway is 300 m long. What is the planes takeoff speed? 2) A boy is attempting to swim directly across a river. ...
*September 12, 2010 by Johnny*

**Science Help Not sure**

Within the Gaetz Lake Sanctuary in Red Deer, Alberta, is a looped trail that is 4 km long. Suppose a person walked all the way around the looped trail in 1 h, ending where he or she started. Which statement best describes this person’s motion over this time interval? A.The ...
*July 4, 2015 by Emmanuel*

**physics**

I really need help on D part of the following problem: A clever engineer designs a "sprong" that obeys the force law F subscript e = -q(x - x subscript e)^3, where x subscript e is the equilibrium position of the end of the sprong and q is the sprong constant. For simplicity, ...
*December 1, 2009 by Ashley*

**Principles of Finance**

A five-year project has an initial fixed asset investment of $335,000, an initial NWC investment of $35,000, and an annual OCF of −$34,000. The fixed asset is fully depreciated over the life of the project and has no salvage value. If the required return is 10 percent, ...
*October 31, 2015 by frank*

**physics**

An aircraft carrier sails northeast at a speed of 6.0 knots. Its velocity vector is v. What direction and speed would a ship with velocity vector –v have? speed should be in knots and direction should be one of the following: northwest, northeast,southwest, and southeast.
*December 5, 2010 by emily li*

**Physics**

A person walks first at a constant speed of 4.50 m/s along a straight line from point circled A to point circled B and then back along the line from circled B to circled A at a constant speed of 2.95 m/s. What is her average speed over the entire trip? I got 3.7 but it says it...
*March 6, 2015 by Marcus James*

**chemistry**

In a calorimetry experiment in the lab, you were able to record the following data: Mass of water in a calorimeter = 90.0 g Initial temperature of water in calorimeter = 22.0o C Mass of unknown metal = 45.0 g Initial temperature of hot metal = 100.0o C Final temperature of ...
*February 8, 2008 by James*

**Physics**

A roller-coaster car with a mass of 650 kg starts at rest from a point 28 m above the ground. At point B, it is 14 m above the ground. [Express your answers in kilojoules (kJ).] (a) What is the initial potential energy of the car? 1 . kJ (b) What is the potential energy at ...
*March 5, 2012 by Sara*

**PHYSICS HELP**

A couple of astronauts agree to rendezvous in space after hours. Their plan is to let gravity bring them together. She has a mass of 66.0 kg and he a mass of 72.0 kg, and they start from rest 25.0 m apart. A)Find his initial acceleration. i put 7.68* 10^-12 m/s^2 B)Find her ...
*February 16, 2012 by Gina*

**Chemistry**

H2PO4-(aq)+OH-(aq) -> HPO42-(aq)+H2O Experiment/[H2PO4-](M)/[OH-](M)/ Initial Rate(mol/L·min) 1 0.0031 0.00041 0.0021 2 0.0031 0.00082 0.0084 3 0.0093 0.00041 0.0063 4 ? 0.00034 0.0021 (second rows are moles of H2PO4, third rows are moles of OH, and the last rows are ...
*May 15, 2011 by Kat*

**Physics**

An airliner lands with a speed of 48.5 m/s. Each wheel of the plane has a radius of 1.25 m and a moment of inertia of 110 kg · m2. At touchdown, the wheels begin to spin under the action of friction. Each wheel supports a weight of 1.40 ✕ 104 N, and the wheels attain ...
*December 16, 2014 by Elsie*

**home economics**

Graphing : Mooville is a small town in texas. assume that beef is a normal good. what happens to the amount of beef dfemanded or supplied in each of the following cases? draw a separate demand and supply curve for each part of this question, label the axes, and show how the ...
*March 2, 2008 by Miriam*

**physics**

A bullet is fired from a rifle that is held 4.6 m above the ground in a horizontal position. The initial speed of the bullet is 1130 m/s. There is no error in the velocity value. (a) Find the time it takes for the bullet to strike the ground. (b) Find the horizontal distance ...
*September 18, 2012 by Taylor*

**Math/Statistics**

I don't get how to do this...can anyone help? 1. In a large box are 20 ping-pong balls—10 of them are red and numbered 1 through 10, and the other 10 of them are green and also numbered 1 through 10. Two balls are selected from the box without replacement. 1. a.Find the ...
*September 27, 2009 by John*

**science **

1.)a basketball momentarily changes shapes as it bounces off the floor. this is due to balanced forces acting on the ball. True (answer) false 2.) a ball slowing down as it roles across the carpet is an example of what ? (1 point) a.)balanced force b.)friction ( answer ) c.)...
*October 8, 2014 by Hannah Marie*

**Classical Mechanics Physics - Urgent help please**

A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= ...
*December 7, 2013 by Briggs*

**College Algebra**

A truck driver traveled at an average speed of 55 miles per hour on a 200 mile trip to pick up a load of freight. On the return trip(with the truck fully loaded), the average speed was 40miles per hour. What was the average speed for the round trip?
*November 19, 2007 by Courtney*

**physics**

a 43.7 kg student runs down the sidewalk and jumps with a horizontal speed of 4.48 m/s onto a stationary skateboard. the student and the skateboard move down the sidewalk with a speed of 4.25m/s. find the mass of the skateboard in units of kg. how fast would the student have ...
*January 22, 2012 by annonymous*

**physics**

a 43.7 kg student runs down the sidewalk and jumps with a horizontal speed of 4.48 m/s onto a stationary skateboard. the student and the skateboard move down the sidewalk with a speed of 4.25m/s. find the mass of the skateboard in units of kg. how fast would the student have ...
*January 22, 2012 by annonymous*

**physics**

a 43.7 kg student runs down the sidewalk and jumps with a horizontal speed of 4.48 m/s onto a stationary skateboard. the student and the skateboard move down the sidewalk with a speed of 4.25m/s. find the mass of the skateboard in units of kg. how fast would the student have ...
*January 22, 2012 by annonymous*

**physics**

You do a certain amount of work on an object initially at rest, and all the work goes into increasing the object's speed. If you do work W, suppose the object's final speed is v. What will be the object's final speed if you do twice as much work? 1. 4 v 2. 2 v 3. Still v 4.v/(...
*January 16, 2010 by Anonymous*

**physic**

Craig launches the basketball at an angle of 65.0 degrees above the horizontal from a height of 2.00m above the floor.He imparts a speed of 9.70 m/s to the ball and leaves his hand a horizontal distance of 7.25 m from the center of the hoop if the hoop is 3.05 m above the ...
*February 5, 2013 by juliet edmund*

**Physics**

A cart is coasting at a speed v A along a straight and level road. When ten percent of the wagon’s mass is thrown off the wagon, parallel to the ground, and in the forward direction, the wagon stops. However, if this same amount of mass is thrown out the back of the wagon, at ...
*August 7, 2012 by Chad*

**3rd grade**

Thea's soccer team scored 12 goals in the first three games. The team scored the same number of goals in wach of the first two games. The team scored 3 fewer goals in the third game than in the second. How many goals were scored in each game?
*November 13, 2008 by Claire*

**physics**

jack measured that his racquet gives a squash ball 45.0J of kinetic energy when he hits it with a particilar shot.he also measures that it has 18.0J of kinetic energy after one bounce off the court wall. what percentage of its mechanical energy does the ball lose while it ...
*May 8, 2007 by Emma*

**math**

Ken's average driving speed is 25km/hr faster than Jim's. In the same length of time it takes Ken to drive 279 km, Jim drives only 204 km. What is Ken's average speed? Possible Answers: a) 93 km/hr b) 118 km/hr c) 43 km/hr d) 68 km/hr Let x equal the speed of Jim's car. 279/x...
*January 21, 2007 by bill*

**math**

a small plane flying into the wind takes 3 hrs 20 min to complete a flight of 960 km. Flying with the wind the same plane takes 2 h 30 min to make the trip.what is the speed of the plane? what is the speed of the wind? can u plz finish the whole question?? with the speed,time...
*September 23, 2010 by helpyyy*

**PHY1015S**

A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 41.2 kHz. A car is approaching him at a speed of 33.0 m/s. The wave is reflected by the car and interferes with the emitted sound ...
*October 7, 2014 by Bhodloza*

**math**

Tasha collected another set of data values, and used a calculator for the engine speed and horsepower data. She got an equation for the least-squares line: ŷ = 10 + 30x. If Tasha uses this equation to predict horsepower from engine speed, the horsepower associated with an...
*October 24, 2014 by Maragret*

**physics**

In the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between station stops. The more stops there are, the slower the train's average speed. To get an idea of this problem, calculate the time it takes a train to ...
*September 22, 2014 by afia*

**physics**

In the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between station stops. The more stops there are, the slower the train's average speed. To get an idea of this problem, calculate the time it takes a train to ...
*September 22, 2014 by afia*

**trig/ vectors**

Points C and D are directly across from each other on opposite banks of a river. A boat travels across the river directly from point c to point d at a speed of 12 mph. If the current of the river has a speed of 4 mph, at what angle, and speed, must the captain head to travel ...
*April 13, 2014 by Lola*

**physics**

An eagle (m1 = 5.2 kg) moving with speed v1 = 6 m/s collides with a second eagle (m2 = 4.8 kg) moving with speed v2 = 5.6 m/s in a direction at right angle to the first one. After the collision, they hold onto one another. With what speed are they moving after the collision
*October 16, 2012 by Anonymous*

**L A **

What is the prepositional phrase? 1: Our soccer team 2:practices three times 3:a week 4:in the late afternoon I choose 2 is this correct? What is a participle phrase in the sentence? Living in New York, he went to many fantastic Broadway plays. 1:Living in New York 2: he went ...
*May 12, 2015 by Marylyn*

**12th grade**

A projectile is shot from the edge of a cliff h = 125 m above ground level with an initial speed of v0 = 115 m/s at an angle of 37.0° with the horizontal, as shown in Fig. 3-39 (a) Determine the time taken by the projectile to hit point P at ground level. (b) Determine the ...
*September 22, 2009 by sundus*

**Physics**

A two-stage rocket moves in space at a constant velocity of 5100 m/s. The two stages are then separated by a small explosive charge placed between them. Immediately after the explosion the velocity of the 1250-kg upper stage is 5520 m/s in the same direction as before the ...
*October 26, 2010 by Velocityof two stage rocket*

**Physics**

The fast French train known as the TGV (Train à Grande Vitesse) has a scheduled average speed of 216 km/h. (a) If the train goes around a curve at that speed and the acceleration experienced by the passengers is to be limited to 0.060g, what is the smallest radius of curvature...
*July 10, 2010 by Sam*

**pHYSICS**

Packages dropped by planes in the olden days didn't have onboard guidance or propulsion systems such as are found today. The path of the package was determined by the initial veloctiy (of the person that dropped that the package) and the acceleration due to gravity. If a plane...
*September 20, 2007 by McSmarty*

**physics**

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials’ boat pulls up next to the spy’s boat, both boats reach the edge of a 4.5m waterfall. The spy’s speed is 16 m/s and the officials’ speed is 24 m/s. How far apart...
*November 22, 2014 by Wendy*

**Science**

A spy in a speed boat is being chased down a river by government officials in a faster craft. Just as the officials’ boat pulls up next to the spy’s boat, both boats reach the edge of a 4.6 m waterfall. The spy’s speed is 16 m/s and the officials’ speed is 26 m/s. How far ...
*December 6, 2014 by sis*

**Physics - final velocity?**

At sea level, a hydrogen molecule in the air has an average kinetic energy of 5.53×10-21 J. Its mass is 3.32×10-27 kg. The hydrogen molecule shoots straight up without colliding with the molecules in the air. (Assume that you can use g = 9.81 m/s2; although we’ll see in ...
*February 12, 2011 by Em*

**Physics**

A police car is at rest beside a road, looking for speeders. A car passes going at a constant speed of 30.0 m/s. The police car starts up 4 seconds later and accelerates at 2 m/s sq. until it reaches a speed of 40m. If the police car maintains this speed until it catches up ...
*December 18, 2012 by Emily*

**Chemistry**

Ammonium ion (NH4^+) reacts with nitrite ion (NO2^-) to yield nitrogen gas and liquid water. The following initial rates of reaction have been measured for the given reactant concentrations. Expt. # [NH4^+] [NO2^-] Initial rate (M/hr) 1 0.010 0.020 0.020 2 0.015 0.020 0.030 3...
*February 6, 2013 by Anonymous*

**Math**

A man is running around a circular track that is 200m in circumference. An observer uses a stopwatch to record the runner’s time at the end of each lap, obtaining the data in the tale below. a. What was the man’s average speed (rate) between 68 s and 152 s? b. What was the man...
*December 4, 2014 by Kevin*

**physics**

A 41.2 kg student runs down the sidewalk and jumps with a horizontal speed of 4.36 m/s onto a stationary skateboard. The student and skateboard move down the sidewalk with a speed of 4.12 m/s. a. Find the mass of the skateboard (in kg) b. How fast would the student have to ...
*November 17, 2011 by Anonymous...*

**Physics**

A stone is dropped from the top of a cliff and hits the round below with a speed of 50m/s. Assume that the acceleration due to gravity is 10m/s/s. Find it's mean speed, in m/s, during the fall. Do not include units when typing your answer into the box. Using the answer you ...
*November 4, 2015 by Phil*

**physics**

A spring (k=200N/m) is fixed at the top of a frictionless plane inclined at an angle of 40 degrees. A 1 kg block is projected up the plane from an initial position that is distance d=0.60m from the end of the relaxed spring, with an initial kinetic energy of 16J. A) What is ...
*July 27, 2010 by James*

**physics**

A spring (k=200N/m) is fixed at the top of a frictionless plane inclined at an angle of 40 degrees. A 1 kg block is projected up the plane from an initial position that is distance d=0.60m from the end of the relaxed spring, with an initial kinetic energy of 16J. A) What is ...
*August 1, 2010 by James*

**Physics**

A tire cruises up an embankment at 30° for 1 meter before launching across Piranha Lake. What is the velocity of the tire at the top of the embankment in m/s? HELP: Inital KE of the tire is 1/2*M*V2 + 1/2*I*(V/R)2; both rotational and translational Final KE = Initial KE - M*g*...
*October 26, 2009 by Sara*

**Physics**

A spaceship approaching a planet at a speed of 0.20c fires a probe toward a planet. Observers on the planet see the probe approaching at a speed of 0.61c. What is the speed of the probe as measured from the spaceship
*April 25, 2010 by Amy*

**physics**

A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 25.7 minutes at an average speed of 8.82 m/s. During the second part, she rides for 29.6 minutes at an average speed of 4....
*February 12, 2014 by Anonymous*

**Physics **

A bicyclist makes a trip that consists of three parts, each in the same direction (due north) along a straight road. During the first part, she rides for 23.7 minutes at an average speed of 6.31 m/s. During the second part, she rides for 25.0 minutes at an average speed of 4....
*February 9, 2015 by Emily *

**AP Physics**

A ball is thrown horizontally from the top of a building 51 m high. The ball strikes the ground at a point 120 m from the base of the building. The acceleration of gravity is 9.8 m/s 2 Find the x component of its velocity just before it strikes the ground. Answer in units of m...
*September 11, 2012 by Noah*

**Physics- drwls please help**

The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.021 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 0.041 kg and is initially at rest. The collision is not head-...
*February 28, 2007 by Mary*

**Physics - Inelastic Collision ( check + help)**

A billiard ball of mass 0.55kg moves with a velocity of 12.5m/s towards a stationary billiard ball of the identical mass and strikes it with a glancing blow. The first billiard ball moves of at an angle of 29.7deg clockwise from its original direction, with a velocity of 9.56m...
*September 26, 2010 by Shaila*

**general chemistry**

one international mile is defined as exactly 607601155 ft, and a speed of 1 knot is defined as one international nautical mile per hour.What is the speed in meters per second of a boat traveling at a speed of 14.3 knot?
*January 21, 2008 by marinka*

**Physics..help please**

A rifle with a weight of 35 N fires a 4.0 g bullet with a speed of 250 m/s. (a) Find the recoil speed of the rifle. ___m/s (b) If a 700 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle. ___m/s
*October 6, 2010 by jake*

**Physics**

The Effect of Temperature on Gas Behavior Procedure 1. Chose any gas from the list box. Gas, Temperature (K), Most Probable Particle Speed (m/s), Average Particle Speed (m/s) 2. Set temperature to any value. Observe the shape of the frequency distribution of speeds graph. ...
*July 19, 2012 by Alfrieda*

**stats**

20. The sponsor of a local soccer tournament is responsible for writing an article for the local paper announcing the 151, 2nd, and3rdplacewinners. If10teamsareinvitedtothe tournament, and the sponsor wanted to get the article written in advance so it can go out in the next ...
*February 26, 2012 by tim*

**math/ physics**

An athlete executing a long jumper leaves the ground at a 27.0 degree angle and travels 7.89 m. What was the takeoff speed? If this speed were increased by just 5.0%, how much longer would the jump be?
*September 22, 2010 by sara*

**Physics**

A runner travels 100 m in 10.9 s. Assume that it takes him 1.35 s to reach his top speed, which is then maintained for the rest of the race. Find the following values: a) acceleration during the first 1.35 s b) maximum speed
*May 26, 2011 by Katie*

**Physics**

The 17500 Hz whine of the turbines in the jet engines of an aircraft moving with speed 280 m/s is heard at what frequency by the pilot of a second craft trying to overtake the first at a speed of 380 m/s?
*December 15, 2011 by Kyle*

**Physics**

The 17500 Hz whine of the turbines in the jet engines of an aircraft moving with speed 280 m/s is heard at what frequency by the pilot of a second craft trying to overtake the first at a speed of 380 m/s?
*December 15, 2011 by Kyle*

**math**

Q) (Speed) Ahmed drives from Abu Dhabi to Dubai. The journey takes him 1 hour 30min and the distance covered is 130km. What is the average speed at which he was travelling (rounded to the nearest 1km/hr)?
*November 12, 2012 by john*

**Physics**

A train traveling at a speed of 110km/h uniformly decelerates for 20 seconds. During that time it travels 450m a) what is the acceleration m/s square? b) what is its speed after the deceleration? (km/h) Could really use some help. Thank you.
*January 1, 2014 by Danny*

**Math**

8. Sylvia is training for a triathlon. she cycles 6.25 km in 25 min. a) What is her average speed, in kilometres per hour? b) Solve a proportion to determine how long she would take to cycle 40 km. Us the speed in part A)
*May 6, 2014 by Annadona*

**physics**

Two cars, A and B, travel in the same direction on a straight section of highway. A has a speed of 69.5 km/h, and B a speed of 84.3 km/h (both relative to the earth). (b) If A is initially 394 m in front of B, how long will it take for B to reach A?
*May 28, 2014 by jessy*

**college physics**

A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the rocket. The bolt hits the ground 7.00s later. What is acceleration of rocket. I believe if you use x(final)= x(initial +v(initial)deltaT+ 1/2adeltatsquared...
*September 6, 2009 by Drew*

**algebra**

Can someoe please help me figure this out? During the first part of a trip, a canoeist travels 63 miles at a certain speed. The canoeist travels 6 miles on the second part of the trip at a speed of 5 mph. slower. The total time for the trip is 5 hours. 1. What was the speed (...
*July 10, 2008 by C*

**Math**

Carla and Candice left from the same place at the same time and rode their bikes in the same direction along a straight road . Candice biked at an average speed that was three-quarters of Carla's average speed. After 2 hours they were 28 miles apart. What was the average speed...
*October 7, 2013 by Dan*

**physics **

A. A particle is traveling without friction up and down hills and valleys. If its initial potential energy is 6 J and its initial kinetic energy is 78 J, what is its total energy, E? E: J B. If at a later point its potential energy is -14 J, what is its kinetic energy K at ...
*October 12, 2013 by carol *

**Physics**

A rock is thrown vertically upward with a speed of 12.0 from the roof of a building that is 40.0 above the ground. Assume free fall. In how many seconds after being thrown does the rock strike the ground? What is the speed of the rock just before it strikes the ground? The ...
*September 19, 2006 by Morgan*

**physics**

1.A car is traveling a road that includes two sides of an equilateral triangle with a constant speed s. What is the magnitude of the average velocity v of the car? 2.A ship crosses a river aiming at the angle theta to the left from the straight courses. The speed of the ship ...
*March 9, 2011 by sandhu*

**physics**

1.A car is traveling a road that includes two sides of an equilateral triangle with a constant speed s. What is the magnitude of the average velocity v of the car? 2.A ship crosses a river aiming at the angle theta to the left from the straight courses. The speed of the ship ...
*March 9, 2011 by sandhu*

**physics**

A spy in a speed boat is being chased down a river by government oﬃcials in a faster craft. Just as the oﬃcials’ boat pulls up next to the spy’s boat, both boats reach the edge of a 5.3 m waterfall. The spy’s speed is 15 m/s and the oﬃcials’ speed is 24 m/s
*May 1, 2012 by Anonymous*

**Physics**

A bullet with a mass of 4.0 g and a speed of 650 m/s is fired at a block of wood with a mass of 9.7×10−2 kg. The block rests on a frictionless surface, and is thin enough that the bullet passes completely through it. Immediately after the bullet exits the block, the ...
*August 3, 2010 by Todd*

**Modern History**

Hi Guys! Okay sweet, here goes. I'm supposed to be keeping a research journal of my research. In it I like examine my research and process. I've already done my Hypothesis. Under the topic of INITIAL THOUGHTS AND IDEAS I outlined why I chose the topic, what I think I need to ...
*April 14, 2011 by Tasha*

**Physics**

Two disks of identical mass but different radii (r and 2r) are spinning on frictionless bearings at the same angular speed ω0, but in opposite directions. The two disks are brought slowly together. The resulting frictional force between the surfaces eventually brings them...
*November 19, 2011 by Kayla*

**physics!**

A torpedo fired from a submerged submarine is propelled through the water with a speed of 20.00 m/s and explodes upon impact with a target 2000.0m away. If the sound of the impact is heard 101.4s after the torpedo was fired, what is the speed of sound in water? (becuz the ...
*September 11, 2007 by confusedd!HELPP!!!*

**physical science**

a 70 kg man and 50 kg woman are in a boat when its motor fails. the man dives into the water with a horizontal speed of 3 m/s in order to swim ashore. if he changes his mind, can he swim back to the boat if his swimming speed is 1 m/s? If not, can the woman change the boats ...
*September 19, 2012 by tracey*

**help mathhh!!!**

A boat travels down the river in 2.3 hours. The return trip up river takes 3.7 hours. A one way trip down or up river is a distance of 26 miles. If the boat is traveling at maximum speed, what is the boats speed measured in waters with no current? You need to use systems to ...
*December 13, 2012 by erin*

**help math**

A boat travels down the river in 3.0 hours. The return trip up river takes 3.6 hours. A one way trip down or up river is a distance of 23 miles. If the boat is traveling at maximum speed, what is the boats speed measured in waters with no current? You need to use systems to ...
*December 17, 2012 by erin*

**math help!!**

A boat travels down the river in 2.9 hours. The return trip up river takes 3.6 hours. A one way trip down or up river is a distance of 30 miles. If the boat is traveling at maximum speed, what is the boats speed measured in waters with no current? You need to use systems to ...
*February 22, 2013 by lilly*

**physics**

A 7000-kg freight car rolls along rails with negligible friction. The car is brought to rest by a combination of two coiled springs as illustrated in the figure below. Both springs are described by Hooke's law and have spring constants with k1 = 1700 N/m and k2 = 3800 N/m. ...
*March 23, 2012 by Anonymous*

**math**

During the soccer season, richard attempted 80 goals and made about 65% of them. a. How many goals did Richard make? b. The team made a total of 327 goals. What percent of the team's made goals did Richard make? 15 goals;24.5% 52 goals;15.9% 61 goals;49.2% 212 goals;64%
*November 30, 2015 by Mariana*

**physics**

A 41.0-kg body is moving in the direction of the positive x axis with a speed of 306 m/s when, owing to an internal explosion, it breaks into three pieces. One part, whose mass is 8.0 kg, moves away from the point of explosion with a speed of 326 m/s along the positive y axis...
*March 24, 2014 by Tsion*

**math**

3. The height H of an object t seconds after it is propelled upward with an initial velocity v is represented by , where g is the gravitational pull and h is the initial height. The gravitational pull of the moon is 1.6 meters per second squared. The gravitational pull of ...
*July 24, 2011 by Anonymous*

**physics**

A heavy flywheel rotating on its central axis is slowing down because of friction on its bearings. At the end of the first minute of slowing, its rotational speed is 0.90 of its intial rotational speed of 250 rev/min. Assuming a constant rotational acceleration, find its ...
*December 4, 2006 by laura*

**MATH**

1. A boat traveled 210 miles downstream and back. The trip downstream took 10 hours, the trip back took 70 hours. What is the speed of the boat in still water? What is the speed of the current? 2. Flying to Kampala with a tailwind a plan averaged 158km/h. On the return trip, ...
*August 27, 2012 by Kian*

**physics**

as i have known that centripetal force is directly proportional to the angular speed square. so, what is the relationship between angular speed and centripetal force ? when centripetal force increase, does angular speed increase too? i need more explanation.
*July 29, 2013 by kate*

**physics**

2 runners accelerate from rest to their top speeds. The 1st runner pat has an acceleration of 5.9 m/s^2 and reaches her top speed in 4 sec. The second runner steven accelerates at 4.4m/s^2 and takes 6.5 sec to reach his top speed the 2 runners run flat out for the remainder of...
*December 20, 2012 by ty*

**physical**

A 70-kg man and a 50-kg woman are in a 60-kg boat when its motor fails. The man dives into the water with a horizontal speed of 3m/s in order to swim ashore. If he changes his mind, can he swim back to the boat if his swimming speed is 1m/s? If not, can the woman change the ...
*March 2, 2013 by jake*

**Physics**

A car with a mass of 1700 kg is traveling directly northeast (45 degrees between north and east) at a speed of 14m/s (31mph), and collides with a smaller car with a mass of 1300kg that is traveling directly south at a speed of 18m/s (40mph). The two cars stick together during ...
*April 2, 2011 by Anonymous*

**Physics, Kinematics**

You drive with a constant speed of 15.1 m/s for 23.4 s. You then accelerate for 28.7 s to a speed of 25.8 m/s. You then slow to a stop in 37.1 s. How far have you traveled? I've tried dividing this into 3 parts. 1st- constant speed 15.1m/s*23.4s=353.34 m 2nd-accelerating I ...
*December 1, 2011 by Jackie*

**chemistry**

Is average speed (u) the same as root mean square velocity? I found a formula for root mean square velocity which I know is also used for average speed: (3RT/MM)^1/2 Is that right? I don't know what that is supposed to be an average OF, but is all likelihood it is a root mean ...
*January 6, 2007 by Chris*