Saturday

November 22, 2014

November 22, 2014

Number of results: 29,745

**Physics**

A train travels 84 km/h when it reaches a slower train 47 meters ahead traveling the same direction at 24 km/h. If the faster train decelerates at 2.1 m/s^2 while the slower train is at a constant speed, when will they collide? If the train that is faster begins to decelerate ...
*January 11, 2009 by Chloe*

**Physics**

A train travels 84 km/h when it reaches a slower train 47 meters ahead traveling the same direction at 24 km/h. If the faster train decelerates at 2.1 m/s^2 while the slower train is at a constant speed, when will they collide? If the train that is faster begins to decelerate ...
*January 11, 2009 by Chloe*

**Thermodynamics**

Steam in a cylinder-piston arrangement expands from an initial condition of 5 bar, 80% dry to a final state of 2 bar, dry saturated steam. The initial volume of steam is 0.8 m3. The process of expansion can be represented by a straight line on the p–Vdiagram. 5B. What is the ...
*October 17, 2014 by Phy*

**physics**

Traveling at a speed of 14.3 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.730. What is the speed of the automobile after 1.15 s have elapsed? Ignore the effects of ...
*February 3, 2011 by anto99999999999999999999999999*

**physics**

Between two stations a train acclerates uniformly at first, then moves with constant velocity and finally retards uniformly. If the ratio of the time taken be 1:8:1 and the max speed attained be 60km/h then what is the average speed over the whole journey?
*August 16, 2011 by pavatharani*

**Physics**

Traveling at a speed of 16.3 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.620. What is the speed of the automobile after 1.60 s have elapsed? Ignore the effects of ...
*March 1, 2012 by Loweri*

**physics**

Traveling at a speed of 18.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.690. What is the speed of the automobile after 1.41 s have elapsed? Ignore the effects of ...
*March 11, 2012 by Natasha*

**Physics**

The drag coefficient = 0.354 The mass of car = 1200 kg rolling resistance = 180 N Air density = 1.181 kg m^-3 Frontal area = 1.88 m^2 What is the deceleration at a speed of 82 km h^-1 when the car is taken up to high speed and then allowed to coast down on a level road.
*August 18, 2012 by Alex*

**physics**

Traveling at a speed of 18.3 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.540. What is the speed of the automobile after 1.33 s have elapsed? Ignore the effects of ...
*September 18, 2012 by andy*

**Physics**

Traveling at a speed of 19.3 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.620. What is the speed of the automobile after 1.46 s have elapsed? Ignore the effects of ...
*October 19, 2012 by Orla*

**Physics**

Traveling at a speed of 15.9 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.700. What is the speed of the automobile after 2.00 s have elapsed? Ignore the effects of ...
*October 30, 2012 by Anna *

**Physics**

Traveling at a speed of 20.0 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.540. What is the speed of the automobile after 1.11 s have elapsed? Ignore the effects of ...
*November 13, 2012 by Tim*

**Physics**

Traveling at a speed of 15.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.640. What is the speed of the automobile after 1.45 s have elapsed? Ignore the effects of ...
*February 13, 2013 by Randy*

**Physics **

Traveling at a speed of 16.1 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.650. What is the speed of the automobile after 1.20 s have elapsed? Ignore the effects of ...
*September 25, 2014 by Steven*

**physics**

This question is also frustrating me. I just don't a single clue how to do it. A pilot must fly his plane north with a speed of 550 km/hr. A wind of 138 km/hr is blowing at an angle of 31 degrees N of E . What speed does the plane need to keep the desired ground velocity?
*October 8, 2014 by Marie*

**physics**

Traveling at a speed of 19.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.21 s have elapsed? Ignore the effects of...
*October 18, 2014 by Frank*

**physics**

Traveling at a speed of 12.1 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.42 s have elapsed? Ignore the effects of ...
*October 18, 2014 by Sara*

**.**

Traveling at a speed of 19.5 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.21 s have elapsed? Ignore the effects of ...
*October 24, 2014 by river pond*

**Science**

Ok so I have to use kinematic equations to solve these. But I make like a X and Y chart Ex...X|Vix=2.89 dx=? t=? Y|Viy=0 dy=3.7 and so forth. 1. A cliff diver strikes the water 10.3 meters from a cliff 25 meteres high. At what horizontal speed did he leave the cliff? 2. A ball...
*October 28, 2007 by Andrew*

**Physics**

1) Let's continue to investigate your space vacation from last week. Your spaceship, which has a proper length of 300 m, passes near a space platform while you are moving at a relative speed of 86% the speed of light (so v=0.86*c). What is the length of the spaceship when ...
*March 4, 2012 by ronnette*

**Algebra 1 high school **

In deep water, the speed s (in meters per second) of a series of waves and the wavelength L (in meters) of the waves are related by the equation 2(pi)s^2=9.8L. a. Find the speed the the nearest hundredth of a meter per second of a series of waves with the following wavelengths...
*August 27, 2013 by Help now*

**physics**

An obnoxious brat assigns his 0.0221-kilogram pet mouse Mickey the role of stunt mouse by stuffing him into a spring gun and shooting him up into the air at some angle. During the launch process the spring transfers 0.707 J of energy into the \'mouse Earth gravitational fields...
*December 3, 2013 by James*

**physics**

An obnoxious brat assigns his 0.0221-kilogram pet mouse Mickey the role of stunt mouse by stuffing him into a spring gun and shooting him up into the air at some angle. During the launch process the spring transfers 0.707 J of energy into the \'mouse Earth gravitational fields...
*December 3, 2013 by James*

**Calculus**

The growth rate of Escherichia coli, a common bacterium found in the human intestine, is proportional to its size. Under ideal laboratory conditions, when this bacterium is grown in a nutrient broth medium, the number of cells in a culture doubles approximately every 20 min. (...
*July 12, 2013 by Anonymous*

**PHYSÝCS HELP**

A satellite with a mass of 113 kg approaches a large planet at a speed vi,1 =10.3 km/s. The planet is moving at a speed vi,2 =14.6 km/s in the opposite direction. The satellite partially orbits the planet and then moves away from the planet in a direction opposite to its ...
*March 30, 2012 by TUGÝ*

**physics**

A satellite with a mass of 260 kg approaches a large planet at a speed vi,1 = 13.1 km/s. The planet is moving at a speed vi,2 = 10.2 km/s in the opposite direction. The satellite partially orbits the planet and then moves away from the planet in a direction opposite to its ...
*June 12, 2012 by lanre*

**Physics**

What is the speed of a 680 eV electron? What is the speed of a 3.50 keV electron?
*September 8, 2010 by VJC*

**physics**

you find it takes 200N of horizontal force to move an empty pickup truck along a level road at a speed of 2.4m/s. you then load the pickup truck and pump its tires so that its total weight increases by 42% while the coefficient of rolling friction decreases by 19%. now what ...
*October 8, 2010 by ashley*

**physics question**

1) Let's continue to investigate your space vacation from last week. Your spaceship, which has a proper length of 300 m, passes near a space platform while you are moving at a relative speed of 86% the speed of light (so v=0.86*c). What is the length of the spaceship when ...
*March 4, 2012 by ronnette*

**Mths problem sums**

Mr thiru took 1h to drive frm A to B at an average speed of 60Km/h. after taking a rest, he travelled 60km to reach C. His overall average speed was 36km/h. If he left A at 10.50a.m. at What time did he reach C From A to B he travelled 60 km. From B to C he also travelled 60 ...
*September 20, 2006 by Kitty*

**physics**

One glider with a mass 0.2 kg and a speed of 3.5 m/s traveling east collides with another glider with mass 0.5 kg and a speed of 2.0 m/s moving west. They collide and stick together. Calculate the net mechanical energy and is it a loss or gain?
*November 23, 2009 by julia*

**Physics**

Two young sisters with a combined mass of 75 kg ride on a cart of mass 30.0kg travelling at 2.0 m/s. If they jump off together so they land with zero speed relative to the ground, what is the change in speed of the cart?
*January 17, 2010 by rachael*

**Physics-energy**

Calculate the thermal energy dissipated from brakes in a 1310-kg car that descends a 13.5° hill. The car begins braking when its speed is 88 km/h and slows down to a speed of 34 km/h in a distance of 0.52 km measured along the road.
*February 16, 2010 by Anonymous*

**Physics 203**

A supersonic plane flies directly over you at 1.8 times the sound speed. You hear its sonic boom 20s later. What is the plane's altitude, assuming a constant 340 sound speed?
*May 11, 2010 by Mike*

**physics**

1. A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 81 km/hr in 10 seconds. What is the speed after the first 7 seconds of acceleration? A) 157.5 m/s B) 22.5 m/s C) 56.7 m/s D) 15.8 m/s E) 32.1 m/s Obviously, first...
*September 23, 2010 by Jon*

**Physics**

An arrow is launched vertically upward from a crossbow at 98.2 m/s. Ignoring air friction, what is its instantaneous speed at the end of 10.0 s of flight? What is its average speed up to that moment? How high has it risen? What is its instantaneous acceleration 4.20 s into the...
*October 6, 2010 by jake*

**Physics**

What is the pressure difference required to make blood flow thru artery of inner radius 2.0 mm and length 0.18 m at a speed of 5.6 cm/s? I used P1-P2 = speed*8*n*L/r squared n = viscosity of blood = 4 x 10e-3 L = .18 m r = 2 x 10e-3 m When plugged in I get P1-P2 - 80.64 Pa but...
*November 2, 2010 by Dee*

**Physics**

2 trains with 132Hz horns approach one another. The slower train has a speed of 25m/s. what is the speed of the fast train if an observer standing near the tracks between the trains hears a beat frequency of 5.2 Hz?
*February 28, 2011 by Anne*

**Physics**

A block is executing simple harmonic motion on a frictionless surface with an amplitude of .100m. At a point 0.060m away from equilibrium point the speed of the block is 0.320m/s. What is the period? What is the displacement when the speed is 0.20m/s?
*June 29, 2011 by Jocelyn *

**Physics**

A 2.40 kg mass, m, on a frictionless table is moving in a circle with radius 0.500 m at a constant speed. m is attached to a 5.70 kg mass, M, by a cord through a hole in the table. Find the speed with which m must move for M to stay at rest
*September 30, 2011 by Mike*

**Physics**

A 3.50 kg mass, m, on a frictionless table is moving in a circle with radius 0.420 m at a constant speed. m is attached to a 6.40 kg mass, M, by a cord through a hole in the table. Find the speed with which m must move for M to stay at rest.
*February 27, 2012 by Ed*

**Physics**

A 3.50 kg mass, m, on a frictionless table is moving in a circle with radius 0.420 m at a constant speed. m is attached to a 6.40 kg mass, M, by a cord through a hole in the table. Find the speed with which m must move for M to stay at rest.
*February 27, 2012 by Ed*

**physics**

A high-speed sander has a disk 8.00 cm in radius that rotates about its axis at a constant rate of 1100 revolutions per minute. Determine the angular speed of the disk in radians per second.
*March 7, 2012 by Joe*

**vehicle speed**

The radius of curvature of the path for a passenger car is 9.2m. The mass of the vehicle is 1,483kg. The coefficient of friction is 0.76 and the normal reactionary force for a tyre is 41kN. What is the maximum speed (in terms of km/h) of the car for cornering?
*March 19, 2012 by hing*

**physics**

A centrifuge in a medical laboratory rotates at an angular speed of 3300 rev/ min. When switched off, it rotates through 59.0 revolutions before coming to rest. (a) Find the angular speed in rad/s.
*November 4, 2012 by Anonymous*

**science**

A boy and his skateboard have a combined mass of 64 kg. If he is moving with a speed of 3.2 m/s, and collides with a stationary skateboarder whose mass (including his skateboard) is 96 kg, with what speed will the two skateboarders move immediately after the collision?
*February 9, 2013 by chelsea*

**Physics**

A 4.10 kg mass, m, on a frictionless table is moving in a circle with radius 0.390 m at a constant speed. m is attached to a 5.00 kg mass, M, by a cord through a hole in the table. Find the speed with which m must move for M to stay at rest.
*February 22, 2013 by Audrey Riegel*

**Trig**

A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane? Round to one decimal place.
*April 21, 2013 by Nancy*

**physics**

As a train moves away from you, the frequency of its whistle is determined to be 475Hz. If the actual frequency was 500 Hz and the speed of sound in air is 350m/s, what is the Train's speed? answer is 18.4m/s please show and explain steps
*July 17, 2013 by kristen*

**physics**

A dynamite blast at a quarry launches a chunk of rock straight upward, and 2.3 s later it is rising at a speed of 18 m/s. Assuming air resistance has no effect on the rock, calculate its speed at (a) at launch and (b) 5.4 s after the launch.
*September 21, 2013 by girl*

**Science (Graphing) ASAP**

Maria walks at a constant speed of 2 m/s for 8 seconds. a. Draw a speed vs. time graph for Maria’s motion. b. How far does she walk? I wanted to know what numbers would be on the time (x vaule) I know the Y is the position (2,4,6,8,10,12 etc)
*September 28, 2013 by unknown*

**Math**

A pilot of a single engine airplane flies at a constant speed of 200 km/h at a bearing of 25 degree north east there is 40 km/h crosswind blowing south east 45 degree what are plane's actual speed and direction ?
*September 29, 2013 by Vian*

**physics**

Due to continental drift, the North American and European continents are drifting apart at an average speed of about 3 cm per year. At this speed, how long (in years) will it take for them to drift apart by another 658.1 m?
*September 7, 2014 by Sean*

**chaitanya**

A car moving with constant acceleration covers the distance between two points 180m apart in 6sec.its speed as it passes the second point is 45m/s.what is its acceleration and its speed at the first point.
*October 1, 2014 by shaik arish*

**physics**

A person walks first at a constant speed of 4.50 m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 3.00 m/s. (a) What is her average speed over the entire (b) What is her average velocity over the entire trip? trip?
*February 7, 2010 by babidi*

**geometry**

In problems 1 and 2, the initial point and the terminal point of a vector are given. Write the vector in component form. 1. Initial point: (0, 0); Terminal point: (3, -4) A Lesson 13 B Lesson 13 C Lesson 13 D Lesson 13 E Lesson 13 F Lesson 13 2. Initial point: (3, 5); Terminal...
*December 6, 2011 by Cam*

**Physics- Newton's Laws in Space**

Hi! I would really appreciate it if you could help me think through these questions discussing Newton's Laws in Space... 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 ...
*December 2, 2006 by Sophie*

**chemistry**

A specimen of LaNi5 containing hydrogen is placed in a vacuum furnace. After 1 hour, at what depth from the surface of the specimen has the concentration of hydrogen reached 1/3 the initial concentration? The diffusion coefficient of hydrogen in the alloy has a value of 3.091*...
*April 26, 2013 by Anonymous*

**chemistry**

A specimen of LaNi5 containing hydrogen is placed in a vacuum furnace. After 1 hour, at what depth from the surface of the specimen has the concentration of hydrogen reached 1/3 the initial concentration? The diffusion coefficient of hydrogen in the alloy has a value of 3.091*...
*April 28, 2013 by himani.*

**science**

what is the eath's shape similar to? a mashed beach ball: oblate spheroid
*October 12, 2006 by ashley parker*

**physical science**

How do you calculate the heat generated from dropping a metal ball from heights?
*November 21, 2007 by Scott*

**geometry hs**

if the diameter of a spherical ball is doubled,by what factor does its surface area increase?
*May 7, 2009 by eric*

**physics**

You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s?
*February 1, 2010 by Jamie*

**physics**

You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s? 1 s
*February 2, 2010 by jamie*

**PHYSICAL SCIENCE**

WHAT IS THE KINETIC ENERGY OF A BALL WITH THE MASS OF 5KG ROLLING AT 10M/S
*November 2, 2010 by TRISHA*

**physics**

A ball is thrown vertically upward at 14.7 m/s. Show that its maximum height will be 11m.
*February 12, 2011 by Daisha*

**Sceince**

A bowling ball with a mass of 7.3 kg has a net force of 1.5 N acting on it. What is the balls acceleration?
*February 19, 2011 by CATAPULT*

**physics**

The density of a solid ball with a mass of 231 g and a volume of 110 cm^3 is ____ g/cm^3.
*March 27, 2011 by aaron*

**physical science**

A steel ball whose mass is 2.0 kg is rolling at a rate of 2.8 m/s. What is its momentum?
*June 28, 2011 by Micah*

**construction**

How many square yards would it take to cover a ball that had a radius of 3'?
*July 26, 2011 by Mark*

**physics**

what is net force acting on the ball after attaning terminal velosity?
*October 19, 2011 by rahul*

**physics**

What is the downward force on a ball with a mass of 7.5 x 10^-1 kg thrown in the air due to gravity?
*December 1, 2011 by JuJu*

**physics**

how do we calculate the height of a falling ball with a mass of 0.5kg and a velocity of 10m/s.
*December 9, 2011 by sim*

**8th grade Physical Science**

What is the potential energy of a 3 kilogram ball this is on the ground?
*January 19, 2012 by Misty*

**physics**

a small pith ball carries a charge of -1.3 uc. how many excess electrons does this represent?
*May 17, 2012 by ann*

**physical sicence**

how fast must a ball be thrown upward to reach a height of 12 m?
*September 14, 2012 by maria*

**physics**

A ball is dropped from the roof of a building. How fast is it moving after 4.6 seconds?
*September 25, 2012 by lana*

**algebra**

what is the density of a billiard ball that has a volume of 100cm cubed and a mass of 250g?
*October 14, 2012 by karra*

**math**

eric counted 45 finger to play kick ball How many hands went up?
*October 18, 2012 by Janiya*

**physics**

a 3.5 kg bowling ball is 6.5 m above the ground. How much potential energy does it possess?
*December 8, 2012 by Fatimah*

**umt lahore pakistan**

a ball fired verticall an intial spedd of 30m\s At K=U K=u\4
*December 26, 2012 by jamal ahmed*

**Physics**

A 0.055 kg golf ball leaves the tee at 50 m/s. what is its change in momentum (impulse) ?
*January 16, 2013 by Taylor*

**physics**

a ball is dropped from the top of a 5m tall building. what is the velocity when it hits the ground?
*January 30, 2013 by lola lopez*

**Physics**

Find the maximum height reached by a ball thrown upward at a velocity of 95 ft/s
*February 25, 2013 by Angel*

**science**

Calculate the de Broglie wavelength of a 0.44 kg ball moving with a constant velocity of 26 m/s (about 60 mi/h).
*April 2, 2013 by annie*

**physics**

How do we represent the graph for a ball which is dropped to the ground and caught when it bounces up again?
*April 24, 2013 by juhee*

**physics**

How do we represent the graph for a ball which is dropped to the ground and caught when it bounces up again?
*April 24, 2013 by juhee*

**physics**

How do we represent the graph for a ball which is dropped to the ground and caught when it bounces up again?
*April 24, 2013 by juhee*

**algebra**

How long will the ball be in the air until it lands on the ground when h=-4.9t+28t+3.2 quadratics
*May 22, 2013 by Help*

**Physics**

Find the deBroglie wavelength of a 0.10kg ball moving at 19.0m/s? Why don’t we see this wave?
*June 6, 2013 by Anonymous*

**keith**

drop a ball from a height of 1.5 meters. Calculate its seed when it hits the floor
*June 27, 2013 by aaron*

**Probability**

Consider D ={red, blue, green} and F = {ball, car} find DXF
*June 22, 2014 by rosie*

**Physics lab**

During a lab, we dropped a ball from the second story of our school and found out the distance, ave. time, ave. velocity, final velocity and the acceleration. One of the questions is: If we could redo this experiment from a 300 ft radio tower instead of from the second story ...
*September 22, 2008 by Gray*

**college physics**

A 915 kg two-stage rocket is traveling at a speed of 5.50×10^3 m/s with respect to Earth when a pre-designed explosion separates the rocket into two sections of equal mass that then move at a speed of 4.00×10^3 m/s relative to each other along the original line of motion. What...
*May 3, 2010 by peyton*

**English**

Write ten sentences about different people places or things. Begin each sentence with a compound subject. Make sure the compound subject and the verb agree. 1.My friend and I go to the park on the weekend. 2.Lance and Darren don't want to go to the party. 3.Hot Topic and ...
*March 7, 2013 by Jerald*

**Physical Science [repost]**

One more worksheet with questions that I need to have checked! 1.Average speed is the ________ an object travels divided by the ________ it takes. Ans- distance; time 2.The velocity of an object is its ___ in a certain _______. Ans- speed; direction 3.The steepness of the line...
*March 18, 2009 by mysterychicken*

**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 6.60 m/s. During the second part, she rides for 36 minutes at an average speed of 5.40 m/...
*October 4, 2010 by Bala*

**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 6.60 m/s. During the second part, she rides for 36 minutes at an average speed of 5.40 m/...
*October 4, 2010 by Bala*

**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 6.60 m/s. During the second part, she rides for 36 minutes at an average speed of 5.40 m/...
*October 4, 2010 by Bala*

**Ash**

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 5.20 m/...
*October 5, 2010 by Anonymous*

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