Sunday

September 21, 2014

September 21, 2014

Number of results: 28,563

**physics**

You drive on an interstae 10 from San Antonio to Huston, half the [b]time[/b] at 55km/h and the other half at 90km/h. On the way back you travel half the [b]distance[/b] at 55km/h and the other half at 90km/h. What is your average speed from San Antonio to Houston What is your...
*September 10, 2006 by ben*

**algebra**

a motorboat travels 22 mph with the current and 8 mph against the current. Find the speed of the boat in still water and the speed of the current.
*June 19, 2013 by kia*

**Physics**

A 70 kg person is at the top of a 10 m tall slide. Ignoring friction, what is his or her speed at the halfway point where he or she is 5 m from the bottom of the slide? What is his or her speed at the bottom of the slide?
*January 28, 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 22 minutes at an average speed of 6.80 m/s. During the second part, she rides for 36 minutes at an average speed of 5.40 m/...
*October 8, 2010 by Hillary*

**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 22 minutes at an average speed of 6.80 m/s. During the second part, she rides for 36 minutes at an average speed of 5.40 m/...
*October 8, 2010 by Hillary*

**Information MGT**

Cost estimation is always one of the trickiest part of any new project. I wonder why this is so. Do you think majority of projects nearing their completion make everyone realize that the initial cost estimation was way off course? Cost estimation is tricky because of the ...
*April 12, 2007 by Ms Brown*

**maths**

Two trains are on the same track a distance 300 km apart heading towards one another, One at a speed of 150 km/h and other at a speed of 50 km/h. A fly starting out at the front of one train, flies towards the other at a speed of 600 km/h. Upon reaching the other train, the ...
*August 28, 2011 by avinash*

**physics**

A uniform disk with a mass of 800 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz when Jill drops a 130 g clod of clay on a point 7.10 cm from the center of the disk, where it sticks. What is the new rotational speed of the disk?
*December 4, 2007 by stephanie*

**Physics**

In 2000, NASA placed a satellite in orbit around an asteroid. Consider a spherical asteroid with a mass of 1.00×1016 and a radius of 8.50km . What is the speed of a satellite orbiting 4.70km above the surface? What is the escape speed from the asteroid?
*April 7, 2010 by Hoa*

**Chemistry**

Nitrous oxide, N2O, has been used as a dental anesthetic. Suppose that the average speed of an N2O molecule at 25°C is 377 m/s. (It is actually 379 m/s.) Calculate the kinetic energy (in joules) of an N2O molecule traveling at this speed.
*June 7, 2011 by Lance*

**physics**

A helicopter is ascending vertically with a speed of 5.20 m/s. At a height of 120 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: v_0 for the package equals the speed of the helicopter.]
*July 8, 2011 by vicky*

**Physics**

Two objects, A and B, have the same kinetic energy. A has a speed that is 12.1 times greater than the speed of B. What is the ratio of the mass of B to the mass of A? I'm not sure how to do this one given... KE_A = KE_B & V_A = 12.1V_B How do I find the ratio of the mass??
*September 26, 2011 by Kaylee*

**Chemistry**

Nitrous oxide, N2O, has been used as a dental anesthetic. Suppose that the average speed of an N2O molecule at 25°C is 433 m/s. (It is actually 379 m/s.) Calculate the kinetic energy (in joules) of an N2O molecule traveling at this speed.
*November 21, 2011 by Samantha*

**Science**

An 80 kg person decides to jump off the back end of a 30 kg canoe. His friend measures the speed of the canoe after he jumps to be 0.8 m/s. The canoe was initially at rest. What rule would I use to find the speed of the person who jumped?
*January 19, 2012 by Micheal*

**physics14**

A uniform disk with a mass of 900 g and radius 17.0 cm is rotating on frictionless bearings with an rotational speed of 18.0 Hz when Jill drops a 180-g clod of clay on a point 8.70 cm from the center of the disk, where it sticks. What is the new rotational speed of the disk?
*March 22, 2012 by opp*

**intro. to physics**

a helicopter is ascending vertically with a speed of 5.20 m/s. at a height of 100 m above the Earth, a package is dropped from a window. how much time does it take for the package to reach the ground ? (hint: v0 for the package equals the speed of the helicopter). thank you !
*April 15, 2012 by emilia*

**science**

a bullet of mass0.01 kg and travelling with a speed of 500m/s strikes a block of mass 2 kg which is suspended by a string of length 5m. The center of gravity of the block is found to raise vertical distance of 0.1m. The speed of bullet after emerging from block is:
*August 4, 2012 by kapindra*

**physics**

In a test run, a certain car accelerates uniformly from zero to 17 m/s in 2.95s. a.) what is the magnitude of the car's acceleration? b.) how long does it take the car to change it's speed from 8.5m/s to 17m/s? c.) will doubling the time always double the change in speed?
*February 3, 2013 by george*

**physics**

A bat moving at 3.7 m/s is chasing a ﬂying insect. The bat emits a 36 kHz chirp and receives back an echo at 36.79 kHz. At what speed is the bat gaining on its prey? Take the speed of sound in air to be 340 m/s.
*February 10, 2013 by Anonymous*

**algebra**

A Boeing 747 flies 2420 miles with the wind. In the same amount of time, it can fly 2140 miles against the wind. The cruising speed ( in still air) is 570 mph. Find the speed of the wind.
*June 10, 2013 by Anonymous*

**physics**

Suppose you are stopped for a traffic light, and a fast ambulance approaches you from behind with a speed of 34.0 m/s. The siren on the ambulance produces sound with a frequency of 960 Hz. The speed of sound in air is 343 m/s. What is the wavelength of the sound reaching your ...
*July 29, 2013 by eddy*

**physics**

At the Indianapolis 500 time trials, each car makes four consecutive laps, with its overall or average speed determining that car’s place on race day. Each lap covers 2.5 (exact). During a practice run, cautiously and gradually taking his car faster and faster, a driver ...
*September 29, 2012 by sammy*

**physic**

1) if you live 10.0 km from your school and the bus takes 0.53 h to reach the school driving due east, what is the average velocity of the bus? 2) To qualify for the finals in a racing event, a race car must achieve an average speed of 250 km/h on a track with a total length ...
*October 14, 2009 by Shelby*

**Physics**

A 1.00kg ball and a 2.00kg ball are connected by a 4.63m long rigid, massless rod. The rod is rotating clockwise about its center of mass at 33.0rpm. What torque will bring the balls to a halt in 4.07s? My Attempt: Center of Mass = [(1kg)(0m) + (2kg)(4.63m)]/(1kg+2kg) =9.26/3...
*October 20, 2012 by Syed*

**chemistry**

Data obtained from lab (neutralization): H2SO4: C =1.0mol/l V = 30 mL Initial temp. = 24.1 NaOH c= 1.0mol/L v= 50 mL initial temp. = 23.9 Final temp. of H2SO4 & NaOH = 32.9 Assume specific heat capacity of both these substance is equal to water's = 4.19 Calculate the molar ...
*June 12, 2010 by Jenna*

**introductory Facts and concepts**

On page 111 of your reading material there is a problem that requires you to calculate the average speed for a daylong bus trip. The rest stops the driver made are included in the calculations because that is how the problem is defined. However, suppose the bus driver’s ...
*February 18, 2013 by Anonymous*

**algebra**

At the Wild Thing Zoo, you can rent a motorized cart to tour the grounds for a $4 initial charge and $4 per hour. An equation that represents the total cost y for x hours is y = 4 + 4x. At Safari Zoo, you can rent the same cart for a $3 initial charge and $5 per hour. An ...
*December 21, 2012 by Sophie*

**physics**

Joe pushes horizontally on a heavy box across a rough surface at constant speed. Which one of the following statements concerning this situation is false? If Joe stops pushing on the box, the box will stop sliding eventually. If Joe doubles his force on the box, the speed of ...
*June 8, 2014 by Sam*

**Physics**

A 4-kilogram mass has a speed of 6 m/s on a horizontal frictionless surface. The mass collides head-on and elastically with an identical 4-kilogram mass initially at rest. The second 4-kilogram mass then collides head-on and sticks to a third 4-kilogram mass initially at rest...
*January 17, 2008 by Hannah*

**Science**

1. In the following diagram, the green ball changes direction after colliding with the red ball because the red ball has more momentum. True <---- False 2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s. 4.00 kg m/s 20.0 kg m/s 25.0 kg m/s 100 kg m/s <...
*March 17, 2014 by Chloé*

**science**

A bungee jumper jumps (with no initial speed) from a tall bridge attached to a light elastic cord (bungee cord) of unstretched length L. The cord first straightens and then extends as the jumper falls. This prevents her from hitting the water! Suppose that the bungee cord ...
*October 22, 2013 by mechanics*

**science**

In the following diagram, the greem ball changes direction after colliding with the red ball because the red ball has more momentum. True <---- False 2. What is the momentum of a 20.0 kg scooter traveling at 5.00 m/s. 4.00 kg m/s 20.0 kg m/s 25.0 kg m/s 100 kg m/s <---- ...
*March 10, 2014 by thenameisjordan*

**physics**

hi, reading over momentum notes and i just want to clarify a few things. if i had a system containing a cart that was moving (cart 1) and then a cart that was stationary (cart2)would there be any net external force acting on the system between the initial position of cart 1 ...
*November 13, 2011 by dave*

**Physics HELP**

1.If a particle moves in a plane so that its position is described by the functions x=A*cos(wT) and y=A*sin(wT), the particle is ( w-angular velocity, T-period) A) moving with constant speed along a circle B) moving with a varying speed along a circle Thanx! Note that x^2 + y^...
*May 13, 2007 by Kelly*

**algebra**

I have a problem with break even analysis? the question is I'm trying to find the cost between 2 businesses to care for my lawn. The one company has an initial fee of $200+$50an hour for labor cost and the second company has an initial cost of $300+$25an hour for labor cost. ...
*March 15, 2011 by Sylvia*

**physics**

A car moves with speed v on a horizontal circular track of radius R. The height of the car's center of mass is h, and the separation between the inner and outer wheels is d. The road is dry, and the car does not skid. Find the maximum speed the car can have without overturning.
*November 20, 2008 by Mischa*

**Physics**

Two grenades, A and B, are thrown horizontally with different speeds from the top of a cliff 70 m high. The speed of A is 2.50 m/s and the speed of B is 3.40 m/s. Both grenades remain in air for 3.77 s. Assume that the acceleration due to gravity is 9.86 m/s^2. What is the ...
*September 21, 2009 by Willie*

**physics**

In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 2.00 m and cross the bar with a speed of 0.71 m/s?
*October 12, 2009 by will*

**Physics**

In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.75 m and cross the bar with a speed of 0.63 m/s?
*November 18, 2009 by katie*

**physics**

In the high jump, Fran's kinetic energy is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must Fran leave the ground in order to lift her center of mass 1.95 m and cross the bar with a speed of 0.70 m/s?
*March 3, 2010 by Justin*

**physics**

The speed limit in a school zone is 38 km/h. A driver traveling at this speed sees a child run onto the road 16 m ahead of his car. He applies the brakes, and the car decelerates at a uniform rate of 8.5 m/s2. If the driver's reaction time is 0.55 s, What is the stopping ...
*September 6, 2010 by emma*

**physics**

In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.65 m and cross the bar with a speed of 0.75 m/s?
*March 1, 2011 by Matt*

**physics**

An airplane has an effective wing surface area of 16 square meter that is generating the lifting force. In level flight the air speed over the top of the wings is 62m/s, while the air speed beneath the wings is 54m/s. What is the weight of the plane?
*March 20, 2011 by alistair*

**trig**

Given the radius of a wheel is 12inches and the angular speed is measured to be 3pie/4 radiant per second, find the linear speed of the piece of gum stuck to the where. Give both an exact answer. And a decimal answer rounded to 4 decimal places.
*September 17, 2011 by ALISON*

**physics**

After 35 minutes of running, at the 8-{\rm km} point in a 9-{\rm km} race, you find yourself 200m behind the leader and moving at the same speed. What should your acceleration be if you are to catch up by the finish line? Assume that the leader maintains a constant speed ...
*March 20, 2013 by Mimi*

**physics**

After 35 minutes of running, at the 8-{\rm km} point in a 9-{\rm km} race, you find yourself 200m behind the leader and moving at the same speed. What should your acceleration be if you are to catch up by the finish line? Assume that the leader maintains a constant speed ...
*March 20, 2013 by Anonymous*

**calculus**

X. An automobile with seven years of use has a commercial value of $34057.7, but five years ago its value was $72250. If the value of such automobile varies exponentially with the time. (36-41) 36.- What was the value of the automobile when it was new? 37.- What will be the ...
*November 25, 2008 by steve alexander*

**calculus**

An automobile with seven years of use has a commercial value of $34057.7, but five years ago its value was $72250. If the value of such automobile varies exponentially with the time. (36-41) 36.- What was the value of the automobile when it was new? 37.- What will be the value...
*November 25, 2008 by steve alexander*

**Chemistry**

a) Tetraphosphorus (P4), commonly known as white phosphorus, forms different compounds with chlorine (Cl2) depending on the amount of chlorine present. If chlorine is limited, phosphorus trichloride (PCl3) is formed. If there is an excess of chlorine, phosphorus pentachloride...
*September 10, 2014 by Morgan *

**Grade 10 Science**

A racevar accelerates from rest to a final speed of 250km/h. What is the average acceleration of the car? and John beings to walk faster and accelerates at a rate of 5km/h^2. How long did it take him to reach a top speed of 12 km/h? I didn't know how to use the formula because...
*December 1, 2007 by Emily*

**physics**

(a) Just for fun, a person jumps from rest from the top of a cliff overlooking a lake. In falling through a distance H, she acquires a certain speed v. Assuming free-fall conditions, how much farther must she fall in order to acquire speed 2v? Express your answer in terms of H.
*January 20, 2012 by Natasha*

**physics **

1.A train passes an electric post in 8sec and a bridge of length 1km in 108sec .Find the speed of the engine . 2.A runner travels at the rate o f25km/hr for 4min ;then at 50km/hr for 8minn and finally at 20km/hr for 2min .Find a) the total distance covered in km and b)average ...
*May 19, 2012 by srikar*

**Physics **

A race car starts from rest in the pit area and accelerates at a uniform rate to a speed of 35 m/s in 11s, moving on a circular track of radius 500 m. Determine the tangential and centripetal components of the net force excreted on the car(by the ground) when it's speed is 15 ...
*May 19, 2013 by Martin*

**engineering mechanics**

A police officer observes a motorist who is approaching at a uniform speed of 80km/h he in his patrol car starts chasing it as it just crosses him.after accelerating for 8 seconds at a constant rate he attains his top speed of 120km/h how long does it take to overtake the ...
*May 29, 2014 by thayub*

**Calculus**

I'm having trouble with part of a question in a problem set. The question reads as follows: Continuous price discounting. To encourage buyers to place 100-unit orders, your firm's sales department applies a continuous discount that makes the unit price a function p(x) of the ...
*October 16, 2009 by Kelly*

**Physics**

I have to write questions for our California Standards for Physics, like we're making our own 50-question test. Standard 1a: Students know how to solve problems that involve constant speed and average speed. Two questions: do you think this standard needs two questions, or one...
*April 15, 2008 by Emily*

**physics**

A discus thrower (with arm length of 1.2 m) starts from rest and begins to rotate counterclockwise with an angular acceleration of 3.0 rad/s2. (a) How long does it take the discus thrower's speed to get to 4.5 rad/s? (b) How many revolutions does the thrower make to reach the ...
*March 17, 2011 by HELP!!!!*

**Physics**

A discus thrower (with arm length of 1.2 m) starts from rest and begins to rotate counterclockwise with an angular acceleration of 3.6 rad/s2. (a) How long does it take the discus thrower's speed to get to 5.1 rad/s? (b) How many revolutions does the thrower make to reach the ...
*June 14, 2012 by James*

**physics**

A discus thrower (with arm length of 1.2 m) starts from rest and begins to rotate counterclockwise with an angular acceleration of 1.8 rad/s2. (a) How long does it take the discus thrower's speed to get to 3.4 rad/s? (b) How many revolutions does the thrower make to reach the ...
*October 17, 2012 by Marwan*

**physics**

Find the pressure difference on an airplane wing where air flows over the upper surface with a speed of 119 m/s, and along the bottom surface with a speed of 105 m/s. (b) If the area of the wing is 40 m2, what is the net upward force exerted on the wing?
*April 25, 2010 by Kim*

**algebra**

Rachel allows herself 1 hour to reach a sale appointment 50 mile s away. After she has driven 30 miles, she realizes that she must increase her speed by 15 miles per hour in order to get there on time. What was her speed for the first 30 miles?
*August 16, 2010 by jim*

**Physics**

A truck traveling at a constant speed of 40.0 km/h applies its brakes and comes to a complete stop in 5.0 s. The truck starts again and accelerates at a constant rate of 0.80 m/s2. After restarting, how far does the truck travel before reaching its original speed of 40.0 km/h?
*December 17, 2010 by James*

**physics**

You’re standing outside on a windless day when raindrops begin to fall straight down. You run for shelter at a speed of 5.3 , and you notice while you’re running that the raindrops appear to be falling at an angle of about 30 from the vertical. What’s the vertical speed of the...
*October 12, 2011 by jes dores*

**Mechanics AQA igher**

A ship is being steered due east. A current is flowing from north to south, so that the actual velocity of the ship is 12 km/h on a bearing of 120 degree . Find the speed of the current and still water speed of the ship
*February 1, 2012 by Jat*

**physics please help ! **

A helicopter is ascending vertically with a speed of 5.20m/s . At a height of 110m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: for the package equals the speed of the helicopter.]
*April 15, 2012 by maya*

**algebra**

two motorcyclists started at the same point and travel in opposite directions. one travels 6 mph faster than the other.In 4 hours they are 432miles apart. how fast is each traveling? speed of slower mph speed of faster mph
*May 21, 2012 by Anonymous*

**physics**

You’re standing outside on a windless day when raindrops begin to fall straight down. You run for shelter at a speed of 5.2 , and you notice while you’re running that the raindrops appear to be falling at an angle of about 30 from the vertical.What’s the vertical speed of the ...
*October 19, 2012 by Anonymous*

**Math**

How do you set this up? Solve the system using substitution: A boat travels 18 miles downstream in 1.5 hrs. It then takes the boat 3 hrs. to travel upstream the same distance. Find the speed of the boat in still water and the speed of the current. Thanks you!!!
*December 6, 2012 by Erin*

**Physics**

A boat propelled so as to travel with a speed of 0.5m/s in still water, moves directly (in a straight line) across a river that is 60m wide. The river flows with a speed of 0.30m/s. How long in seconds does it take the boat to cross the river?
*October 13, 2013 by Minister Obonukut*

**science**

A bat moving at 5.6 m/s is chasing a flying insect. The bat emits a 60 kHz chirp and receives back an echo at 60.63 kHz. At what speed is the bat gaining on its prey? Take the speed of sound in air to be 338 m/s. Answer in units of m/s
*April 23, 2014 by Anonymous*

**physics**

A barge with mass 1.0×105 kg is proceeding down river at 5.8 m/s in heavy fog when it collides broadside with a barge heading directly across the river (see the figure). The second barge has mass 2.58×105 kg and was moving at 4.2 m/s. Immediately after impact, the second ...
*November 6, 2009 by Brandon*

**math**

A boat cruises downstream for 2 hours before heading back. It takes 3.5 hours going upstream to get back. If the speed of the stream is 8 mph, what is the speed of the boat in still water?:
*September 22, 2007 by --*

**physics**

A student atands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 18.0 m/s. The cliff is 50.0 m above flat, horizontal beach. With what speed of impact does the stone land?
*September 26, 2008 by mb*

**Physics**

A 0.58- kg flashlight is swung at the end of a string in a horizontal circle of 0.85- m radius with a constant angular speed. If no torque is applied, what must the radius become if the angular speed of the flashlight is to be halved?
*November 18, 2009 by kate*

**Physics**

A sprinter starts from rest and reaches his top speed in 4 seconds running with a constant acceleration. He then maintains that top speed and finishes the 100 m in the overall time of 10 seconds. What is his acceleration?
*February 9, 2010 by Drew*

**physics/orbital speed**

an asteroid orbits the sun at a constant distance of 4.44e+11 meters, the suns mass is 1.00*10^30kg, what is the orbital speed of the asteroid? Please explain step by step thanks
*June 17, 2010 by student*

**physics**

A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 13 m/s. The cliff is h=37 m above the water's surface, as shown below. With what speed does it strike the water?
*September 26, 2011 by Aidan*

**physics**

Driving along a crowded freeway, you notice that it takes a time t to go from one mile marker to the next. When you increase your speed by 4.5 mi/h, the time to go one mile decreases by 12 s. What was your original speed?
*September 29, 2011 by Pili*

**Physics**

Suppose one of the Global Positioning System satellites has a speed of 4.50 km/s at perigee and a speed of 3.52 km/s at apogee. If the distance from the center of the Earth to the satellite at perigee is 2.21×104 km, what is the corresponding distance at apogee?
*November 9, 2011 by Cooper*

**physics**

Is the work needed to bring a car's speed from o to 10km/h less than, egaul to or morethen the worked needed to bring its speed from 10 to 20km/h. If the amounts of work are different, what is the ratio between them?
*November 15, 2011 by Agata*

**Physics**

A gray kangaroo can bound across a flat stretch of ground with each jump carrying it 11 from the takeoff point. If the kangaroo leaves the ground at a 18 angle, what is its takeoff speed ? What is its horizontal speed?
*October 13, 2012 by anonymous*

**MAT 116**

A tugboat goes 180 miles upstream in 10 hours. The return trip downstream takes 5 hours. Find the speed of the tugboat without a current and the speed of the current.
*November 11, 2012 by Samantha*

**Physics**

A 0.500 kg particle moves in a circle of R=0.0150 m at constant speed. The time for 20 complete revolutions is 31.7 s. What is the period T of the motion? What is the speed of the particle? What is the centripetal acceleration of the particle? What is the centripetal force on ...
*March 5, 2013 by Nancy*

**math**

The speed of a powerboat in still water is 35 mi/h. It is traveling on a river that flows directly south at 8 mi/h.the boat heads directly west across the river. What are the resulting speed and direction of the boat?
*April 29, 2013 by belkis*

**Physics**

An antelope moving with constant acceleration covers the distance between two points 75.0 m apart in 6.20 s. Its speed as it passes the second point is 15.0 m/s. (a) What is its speed at the first point? (b) What is the antelope’s acceleration?
*June 9, 2013 by Kirk*

**physics **

a 2500kg car is rounding a circular turn of radius 200m at constant speed. the magnitude of its acceleration is 2m/s2.what is the speed of the car? how much is the centripetal force?how much is the centrifugal acceleration?
*August 1, 2013 by nuche Nina cajes *

**physics **

a 2500kg car is rounding a circular turn of radius 200m at constant speed. the magnitude of its acceleration is 2m/s2.what is the speed of the car? how much is the centripetal force?how much is the centrifugal acceleration?
*August 1, 2013 by nuche Nina cajes *

**Physics**

Is it possible for an object to have an acceleration when the speed of the object is constant? yes no not enough information to decide Give your reasoning. acceleration is a vector. So speed could be constant, but the direction changing.
*March 20, 2007 by Mary*

**DrBob222**

A boy is blowing a whistle of frequency 536 Hz and walking toward a wall with a speed of 1.64 m/s. What frequency of the reflected sound will the boy hear if the speed of sound is 343 m/s? 532 Hz
*April 5, 2008 by Jon*

**algebra 1A**

a driver who drives at a speed of r mph for t hr will travel a distance d mi given by d= rtmi. how far will a driver travel at a speed of 62mph for 7hrs. The distance traveled is 434miles correct? thanks
*September 17, 2009 by Lea*

**college**

A block of mass m is dropped from the fourth floor of an office building, subsequently hitting the sidewalk at speed v. From what floor should the mass be dropped to double that impact speed?
*June 15, 2010 by Anonymous*

**Dynamics**

Car A is moving at a constant speed Va=75 km/h, while car C is moving at a constant speed Vc=42 km/h on a circular exit ramp with radius p=80m. Determine the velocity and acceleration of C relative to A.
*January 30, 2011 by Matt*

**physics**

A block of mass m is dropped from the fourth floor of an office building and hits the sidewalk below at speed v. From what floor should the mass be dropped to double that impact speed?
*February 11, 2011 by kevin*

**Physics**

During a car race two cars,a ferarri and a mercedes crashed.The ferarri was travelling at a speed of 340km/h an the mercedes was travelling at a speed of 230km/h.What is the resultant crash
*March 28, 2011 by Sivashen*

**Phy.**

A proton of mass m moving with a speed of 2.5×106 m/s undergoes a head-on elastic collision with an alpha particle of mass 4m, which is initially at rest. What is the speed of the proton after the collision?
*May 8, 2011 by Brian*

**computer science**

Hi, i need to calculate download time for file which is 4GB and the speed is 43.2 kbps. i know i have to divide file size by the speed and to change GB to KB but not sure how to change GB to kbps?
*May 20, 2011 by Subash*

**algebra**

a tugboat goes 160 miles upstream in 20 hours. The return trip downstream takes 10 hours. Find the speed of the tugboat without a current and the speed of the current.
*June 10, 2012 by Math Girl*

**math**

A tugboat goes upstream 120 miles in 20 hours. The return trip downstream takes 10 hours. Find the speed of the tugboat without the current and the speed of the current.
*August 1, 2012 by Lori*

**algebra**

A tugboat goes 180 miles upstream in 15 hours. The return trip downstream takes 10 hours. find the speed of the tugboat without a current and the speed of the current
*August 9, 2012 by maggie*

**alegbra**

a tugboat goes 160 miles upstream in 20 hours. The return trip downstream takes 5 hours. Find the speed of the tugboat without a current and the speed of the current.
*August 19, 2012 by ashley*

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