Saturday

January 31, 2015

January 31, 2015

Number of results: 30,483

**physics**

A jet plane is traveling at a constant speed in a straight line in level speed. What does this tell you about the forces acting on it, what forces are acting on it .
*March 25, 2012 by Melissa*

**Physics**

A person takes a trip, driving with a constant speed of 92.0 km/h except for a 22.0 min rest stop. If the person's average speed is 78.6 km/h, how long is the trip?
*August 29, 2012 by Ashley*

**Physics**

14. A racing car accelerates uniformly through three gears, changes with the following average speed: 20 for 2.0 s 40 for 2.0 s 60 for 6.0 s What is the overall average speed of the car?
*September 14, 2012 by Mariam*

**Physics**

14. A racing car accelerates uniformly through three gears, changes with the following average speed: 20 for 2.0 s 40 for 2.0 s 60 for 6.0 s What is the overall average speed of the car?
*September 14, 2012 by Mariam*

**physics**

14. A racing car accelerates uniformly through three gears, changes with the following average speed: 20 for 2.0 s 40 for 2.0 s 60 for 6.0 s What is the overall average speed of the car? A. 12 B. 13.3 C. 40 D. 48 E. 37
*October 19, 2012 by Anonymous*

**science**

A 2.1-kg brick is placed gently upon a 2.9-kg cart originally moving with a speed of 26 cm/s. Determine the post-collision speed of the combination of brick and cart.
*April 3, 2014 by bizzle*

**physics**

a warehouse employee is pushing a 38 kg desk across a floor at a constant speed of 0.4 m/s. How much work must the employee do on the desk to change the speed of 1.5m/s?
*November 2, 2014 by jorge*

**Physics help!**

derive a fundamental equation that is used to determine the speed of a rocket. This vague statement is bordering on the undefined. There are many equations that are used in determining the speed of a rocket.
*November 7, 2006 by Krystal*

**algebra**

a boat goes 16 Km upstream and 24 Km downstream in 6hrs.it can go 12Km upstream and 36 Km in same time.find the speed of boat in still water and speed of the stream
*September 5, 2010 by sara*

**algebra**

a boat goes 16 Km upstream and 24 Km downstream in 6hrs.it can go 12Km upstream and 36 Km in same time.find the speed of boat in still water and speed of the stream
*September 5, 2010 by sara*

**Physic**

It is possible to shoot an arrow at a speed as high as 121 m/s. (a) If friction is neglected, how high would an arrow launched at this speed rise if shot straight up?
*September 13, 2010 by Matt *

**science**

5a 30 kg girl and a 25 kg boy face each other on friction -free roller blades . the girl pushes the boy ,who moves away at a speed of 1.0 m/s . the girls speed is how many m/s /
*September 19, 2010 by Rich *

**science**

A 30kg girl and a 25 kg boy face each other on friction free roller blades the pushes the boy who moves away at a speed of 1.0m/s the girl's speed is m/s?
*October 21, 2010 by Reno*

**Math**

H(x)= 0.002x^2+0.005x-0.029 where x is the speed of the car in miles per hour. How can I rewrite the function so that x represe the speed in kilometers per hour. [Find H(x/1.6)]
*February 9, 2011 by Ethan*

**physics**

At a certain time a particle had a speed of 91 m/s in the positive x direction, and 4.7 s later its speed was 73 m/s in the opposite direction. What was the average acceleration of the particle during this 4.7 s interval?
*August 29, 2011 by renee*

**physics**

Starting at 9a.m you hike for 3h at an average speed of 4mph.You stop for lunch from noon until 2pm. What is your average speed over the interval from 9am to 2pm.
*September 1, 2011 by rally*

**physics**

A child pedals a tricycle, giving the driving wheel an angular speed of 0.373 rev/s. If the radius of the wheel is 0.260 , what is the child's linear speed?
*October 23, 2011 by Joseph*

**Algebra II**

A plane flies with a heading of 48 degrees NW and an air speed of 584 km/h. It is driven from its course by a wind of 58.0 km/h from 12.0 degrees SE. Find the ground speed and the drift angle of the plane.
*November 2, 2011 by Arielle*

**Math**

The stopping distance d of a car in feet is related to the speed in mph by the equation d(s)=.02s^2+1.1s Calculate the speed when your stopping distance is: 1.) 51ft 2.) 315.12ft
*February 25, 2012 by Devin*

**trigonometry**

A plane is headed due west with an air speed of 300 mph. The wind is from the north at 80 mph. Find the bearing for the course and the ground speed of the plane.
*November 27, 2012 by mikey*

**Algebra 1**

A car travels on a highway at an average speed of 65 miles per hour. What was the speed in feet per second? (Remember- 1 mile=5280 feet)
*January 24, 2013 by Dani*

**Physics**

At a certain time a particle had a speed of 60 m/s in the positive x direction, and 1.7 s later its speed was 59 m/s in the opposite direction. What was the average acceleration of the particle during this 1.7 s interval
*January 25, 2013 by Anonymous*

**Physics**

At a certain time a particle had a speed of 60 m/s in the positive x direction, and 1.7 s later its speed was 59 m/s in the opposite direction. What was the average acceleration of the particle during this 1.7 s interval
*January 25, 2013 by Anonymous*

**Physics**

The speed of the car at the base of a 30 ft hill is 45 mi/h. Assuming the driver keeps her foot off the brake and accelerator pedals, what will be the speed of the car at the top of the hill?
*October 15, 2014 by Steven*

**Finance**

Firm is contemplating the purchase of a new warehouse inventory management system which will cost 3,600,000 at the end of its 8 year life. The warehouse management system will be depreciated straight line to 300,000 over its 8 year life. It is estimated it will reduce costs by...
*December 2, 2013 by Thad*

**Statistics**

When fifteen vehicles were observed at random for their speeds (in M.P.H.) on a freeway, the following data were obtained. 61 53 57 55 62 58 60 54 62 60 59 66 55 54 63 Suppose that from past experience it may be assumed that vehicle speed is normally distributed with standard ...
*April 29, 2012 by Jennifer*

**Statistics**

When fifteen vehicles were observed at random for their speeds (in M.P.H.) on a freeway, the following data were obtained. 61 53 57 55 62 58 60 54 62 60 59 66 55 54 63 Suppose that from past experience it may be assumed that vehicle speed is normally distributed with standard ...
*April 30, 2012 by Beth*

**Art**

Thank you very much for your suggestions. I urgently need your help to check these statements on tennis. 1) The most important tennis shoots are forehand and backhand. These shoots are very important because when the ball bounces you must hit the ball with these two shoots (...
*May 3, 2012 by Frank*

**fizik**

Two shuffleboard disks of equal mass, one orange and the other yellow are involved in a perfectly elastic glancing collision. The yellow disk is initially at rest and is struck by the orange disk moving initially to the right at 7.00 ms"1. After the collision, the orange disk ...
*April 11, 2011 by alya*

**Physics**

A person is standing on the edge of a cliff of height h= 24 m. She throws a stone of mass m=0.2 kg vertically down with speed v0= 10 m/s (stone 1) and another stone of the same mass vertically up at the same speed (stone 2). The gravitational acceleration is g=10 m/s2. (a) ...
*October 6, 2013 by Anon*

**Science**

A graph shows distance on the vertical axis and time on the horizontal axis. If the speed is steadily increasing, what will the line representing speed look like on the graph?
*October 24, 2007 by mary*

**Physics**

An object in uniform circular motion moves at a constant speed around a circle with a fixed radius. Why is the object said to be accelerating though it has a constant speed?
*September 21, 2009 by Willie*

**math**

you finish a two-mile walking race in 36.5 minutes. Write an inequality for the average speed of the walkers who finish after you did. (Average speed= distance/time)
*December 7, 2009 by Auri*

**Physics**

"A roller coaster reaches the top of the steepest hill with a speed of 1.4m/s. It then descends the hill which is at an average angle of 45 degrees and is 50m long. What will its speed be when it reaches the bottom?"
*July 12, 2010 by Stuck*

**PHYSICAL SCIENCE**

A 30 KG GIRL AND A 25 KG BOY FACE EACH OTHER ON FRICTION-FREE ROLLER BLADES. THE GIRL PUSHES THE BOY, WHO MOVES AWAY AT A SPEED OF 1.0 M/S. THE GIRLS SPEED IS?
*August 21, 2010 by JACQUELYNNE*

**Physics**

Skater N, 58.9 kg, is moving north at a speed of 7.8 m/s when she collides with Skater E, 72.6 kg, moving east at 3.5 m/s. The two skaters are stuck together. In what direction and with what speed do they move after the collision?
*February 7, 2011 by SARAH*

**Physics**

Skater N, 58.9 kg, is moving north at a speed of 7.8 m/s when she collides with Skater E, 72.6 kg, moving east at 3.5 m/s. The two skaters are stuck together. In what direction and with what speed do they move after the collision?
*February 7, 2011 by SARAH*

**Math**

Ryan is batting a baseball, he presently can cover the 90 foot distance with the average speed of 20 feet per second What is the average speed in miles per hour?
*March 21, 2011 by popcorn101*

**algebra**

the current in a stream moves at a speed of 2 mph. A boat travels 8mi upstream and 8mi downstream in a total time of 7 hr. What is the speed of the boat in still water
*March 22, 2011 by Anonymous*

**physics**

A person takes a trip, driving with a constant speed 94 km/h except for a 83 min rest stop. If the person's average speed is 70 km/h, how far is the trip? Answer in units of km
*August 24, 2011 by Shannon*

**physics**

A bus is pushed forward and released at = 3.5 with a speed of 1.0 . It rolls at a steady speed for 1.2 , then one wheel begins to stick. The bus comes to a stop 3.4 from the point at which it was released.
*September 17, 2011 by smarth*

**Physical Science **

a 30 kg girl and a 25 kg boy face each other on a friction-free blades. The girl pushes the boy, who moves away at a speed of 1.0 m/s. The girls speed is __________m/s
*October 25, 2011 by Grace*

**algebra**

A jogger ran 6 miles, decreased her speed by 1 mile per hour and than ran another 7 miles. If total jogging time was 2 1/42, find speed for each part of her run.
*December 15, 2011 by ty*

**Physics**

An alpha particle, initially moving at a speed of 7.10x10^5m/s, goes through a potential difference of 2500V. Determine the final speed of the alpha particle. Answer: 8.64 x 10^5
*April 3, 2012 by Sarah*

**physics**

a car moving with a speed of 50 km/hr can be spotted by breaks after at least 6m.If the same car is moving with a speed of 100km/hr the minimum stopping distance is? options: 1. 24m 2. 6m
*May 26, 2012 by srikala*

**physics**

A speed bike tops a hill at 3.5 m/s and accelerates steadily down hill reaching a speed of 11.4 m/s after 4.2 seconds. How far did the bike travel during this period?
*June 4, 2012 by lloyd *

**math**

The speed of a stream is 6 mph. If a boat travels 52 miles downstream in the same time that it takes to travel 26 miles upstream, what is the speed of the boat in still water?
*July 22, 2012 by john*

**Dynamics**

The power developed by a man in riding up a 6 percent grade at a constant speed is 200 w. The man and his bicycle have a combined mass of 80 kg. Determine the speed of riding
*July 31, 2012 by Dhilsath*

**Physics..PLZ HELP!! **

A rollercoaster reaches the top of the steepest hill with a speed of 6.0 km/h. It then descends the hill, which is at an average angle of ?=45 and is 45.0 m long. Estimate its speed when it reaches the bottom. Assume µk=0.18.
*October 8, 2012 by Liz*

**Physics**

Consider a swimmer who wants to swim directly across a river. If the speed of the current is 0.31 m/s and the swimmer's speed relative to the water is 0.57 m/s, how long will it take her to cross a river that is 13 m wide?
*October 20, 2012 by Anne*

**Physics**

At a certain time a particle had a speed of 16 m/s in the positive x direction, and 2.2 s later its speed was 30 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.2 s interval?
*January 27, 2013 by Patricia*

**Physics**

At a certain time a particle had a speed of 16 m/s in the positive x direction, and 2.2 s later its speed was 30 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.2 s interval?
*January 27, 2013 by Patricia*

**Physics**

At a certain time a particle had a speed of 17 m/s in the positive x direction, and 2.0 s later its speed was 32 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.0 s interval?
*January 28, 2013 by Rachel*

**Physics**

At a certain time a particle had a speed of 17 m/s in the positive x direction, and 2.0 s later its speed was 32 m/s in the opposite direction. What is the magnitude of the average acceleration of the particle during this 2.0 s interval?
*January 28, 2013 by Rachel*

**Physics**

You run a race with your friend. At first you each have the same kinetic energy, but then you find that she is beating you. When you increase your speed by 21.0%, you are running at the same speed she is. If your mass is 77.0 kg, what is her mass?
*February 10, 2013 by Jake*

**physics**

suppose you are driving on a straight two lane road at a constant speed of 88 km/h truck travelling at a constant speed of 104 km/h approaches you.what is the truck's velocity relative to you.
*March 3, 2013 by pat*

**math**

IF the speed of train A is 10 mph slower than train B. Train A travels 220 miles in the same time it takes train B to travel 270. What is the speed of both trains.
*April 27, 2013 by nannypam*

**dynamics**

the power developed by a man in riding up a 6 percent grade at a constant speed is 200w. the man and his bicycle have a combined mass of 80 kg. Determine the speed of riding
*July 22, 2013 by Anonymous*

**Physics Angular Motion**

A wheel with a radius of 1.5m rotates at uniform angular speed. If a point on the rim of the wheel has a centripetal acceleration of 1.2 m/s/s whats the points tangential speed?
*August 4, 2013 by Xian*

**math**

A boat takes 90 minutes less to travel 36 km downstream then to travel the same distance upstream.If the speed of the boat in still water is 10 kmph.What is the speed of the current?
*June 21, 2014 by sangita*

**physics**

A car of mass 550 kg is moving at a speed of 1.5 m/s. A man pushes the car, increasing the speed to 3.2 m/s. How much work did the man do? A. 3435 J B. 2816 J C. 2197 J D. 4123 J
*October 4, 2014 by meriyhome*

**algbra**

a paddle boat can move at a speed of 14 km/h in still water. the boat is paddled 16 km downstream in a river in the same time it takes to go 8km upstream. what is the speed of the river?
*October 31, 2014 by Anonymous*

**math**

You jog at 6.6 mi/h for 5.0 mi, then you jump into a car and drive for another 5.0 mi. With what average speed must you drive if your average speed for the entire 10.0 miles is to be 10.4 mi/h? answer is 24.5 mi/h. WHY??
*August 19, 2009 by jawn*

**math**

Terry bicycles for 1/4 at an average speed of x km/hr. He then cycles for 1/3 hour at an average speed of x+10 km/hr. he cycles a total distance of 15 km. work out the value of x.
*December 10, 2009 by maverick*

**physics**

The speed of light in a certain material is 1.6 × 108 m/s. Express the speed of light in (a) feet per nanosecond (ft/ns) and (b) millimeters per picosecond (mm/ps).
*January 26, 2011 by sagara*

**physics**

The speed of light in a certain material is 1.6 × 108 m/s. Express the speed of light in (a) feet per nanosecond (ft/ns) and (b) millimeters per picosecond (mm/ps).
*January 26, 2011 by Megan Fox*

**Physics**

A motorboat travels at a speed of 40 km/h relative to the surface of the water. If it travels upstream against a current of 12 km/h what is the boats speed relative to the shore?
*April 15, 2011 by aj*

**physics**

You jog at 6.2 mi/h for 5.0 mi, then you jump into a car and drive for another 5.0 mi. With what average speed must you drive if your average speed for the entire 10.0 miles is to be 10.6 mi/h? I don't get why the answer isn't 15.
*November 1, 2011 by John*

**physics**

Waves on a particular string travel with a speed of 17 m/s. By what factor should the tension in this string be changed to produce waves with a speed of 102 m/s
*February 7, 2012 by Will*

**physics**

A woman with a mass of 56 kg runs at a speed of 8 m/s and jumps onto a giant 30 kg skateboard initially at rest. What is the combined speed of the woman and the skateboard?
*February 11, 2012 by brett*

**physics**

A woman with a mass of 41 kg runs at a speed of 7 m/s and jumps onto a giant 30 kg skateboard initially at rest. What is the combined speed of the woman and the skateboard?
*September 26, 2012 by megan*

**algerbia**

a tugboat goes 120 miles up streem in 15 hours it takes 10 hours to come back the speed of the tugboat is and the speed of the curent is
*October 21, 2012 by Anonymous*

**science help !!**

1. Why is California’s high-speed rail such a groundbreaking effort? 2. Why will it take so long to complete the high-speed rail route?
*May 21, 2014 by kelsey *

**Health**

Marion prides herself on being a good defender on the basketball court. She can block shots easily. Her coach says that to be a better player for the team, she needs to improve her power for specific skills. Marion can improve her power in basketball by · getting proper ...
*December 31, 2013 by Steve*

**More Physics**

The diagram below indicates three positions to which a woman travels. She starts at position A, travels 3.0 km to the west to point B, then 6.0 km to the north to point C. She then backtracks, and travels 2.0 km to the south to point D. a) What is the total displacement of the...
*October 29, 2006 by Ellie*

**Physics**

A 1200-kg automobile is stolen by the notorious Physics joyriders known as “the centripetal gang”. The gang tests their grasp on Newtonian physics by cruising around a banked circular track of radius 1025 m. From previous ‘experiments’ the gang has discovered the car’s ...
*February 24, 2013 by Meder*

**Physics**

Mutiple choice: A car travelling at 10 m/s accelerates at 3 m/s^2. Its new velocity is A.) 12 m/s B.) 22m/s C.) 17 m/s D.) Can not be determined. Which of the following is not acceleration? A.) rate of change of speed in a particular direction B.) rate of change of motion in a...
*December 17, 2013 by Katie*

**PHYSICS PLEASE HELP !!!!!**

A mass of 6 kg is tied to a 2 meter long rope and is swung in a vertical circle. At the bottom of the circle, the mass is moving at a speed of 16 m/s. What is the tension, in Newtons, in the rope after the mass has traveled to a point exactly halfway between the top and bottom...
*October 27, 2011 by Amanda *

**math please help**

the soccer goaie has made 175 saves so far this season. The score record is 236 saves in a season with 6 games left to play which interquality could you use to solve to find the average saves the goalie must make in each of the remaining games to break the school record? is it...
*February 20, 2011 by hunter*

**Physics**

A 59.5 kg person, running horizontally with a velocity of +3.90 m/s, jumps onto a 12.2 kg sled that is initially at rest. (a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move away. (b) The sled and person coast 30.0 m...
*February 28, 2007 by Mary*

**physical science**

A person takes a trip, driving with a constant speed 85.6 km/h except for a 22.6 minute rest stop. If the person's average speed is 61.6 km/h, how far is the trip? Answer in units of km.
*February 11, 2008 by Anonymous*

**physics**

A stone is thrown straight downward with a speed of 2.2 meter per second from a height of 28 meters. What is the speed of this stone 1 second after it is released? [Neglect air resistance.]
*October 15, 2009 by Janice*

**Physics**

A particle executes simple harmonic motion with an amplitude of 9.00 cm. At what positions does its speed equal two thirds of its maximum speed? I got: v2 +ω^2x^2 =ω^2A^2 vmax =ω A and v = ωA/2?
*January 4, 2010 by Zoe*

**Science Please I NEED Help!!!!!!!!!!!!!!!!!!!!!!!!**

Describe how the instantaneous speed of a car changes when the car is moving with constant speed , speeding up, and slowing down please answer as soon as possible
*March 28, 2010 by dina*

**AP Physics**

A pole-vaulter approaches the takeoff point at a speed of 9.50 m/s. Assuming that only this speed determines the height to which he can rise, find the maximum height at which the vaulter can clear the bar.
*November 13, 2010 by Greg*

**Physics**

Water at a pressure of 400,000Pa flows through a horizontal pipe at a speed of 1.50 m/s. The pipe narrows to 1/8 its original diameter. What is the flow speed through the narrow section?
*February 2, 2011 by Mary*

**Math (Truly Need Help)**

H(x)= 0.002x^2+0.005x-0.029 where x is the speed of the car in miles per hour. How can I rewrite the function so that x represe the speed in kilometers per hour. [Find H(x/1.6)]
*February 9, 2011 by Ethan*

**general science**

A Graph Shows Distance On The Vertical Axis And Time On The Horizontal Axis. If The Speed Is Steadily Increasing, What Will The Line Representing Speed Look Like On The Graph?
*October 24, 2011 by Anonymous*

**physics**

A toy train is pushed forward and released at = 4.0 with a speed of 1.5 . It rolls at a steady speed for 2.6 , then one wheel begins to stick. The train comes to a stop 5.2 from the point at which it was released.
*February 10, 2012 by Anonymous*

**physics**

An antelope moving with constant acceleration covers the distance between two points 70.0 m apart in 7.00 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 its acceleration?
*April 25, 2012 by anjo*

**triggg**

The drag force F (in pounds) of water on a swimmer can be modeled by F = 1.35s^2 where s is the swimmer’s speed ( in miles per hour). At what speed is the force minimized? **Note** ^ means "to the power of."
*April 25, 2012 by cheyanne marie*

**chemistry**

An alien rocketship is traveling at a speed of 4,900,000 4{,}900{,}000 inches per hour. At this speed, how many miles will it travel in 1 minute? Round to the nearest thousandth.
*September 5, 2012 by britney*

**physics**

Suppose that the swimmer in the figure below has a swimming speed relative to the water of 0.44 m/s, while the speed of the current is 2.0 m/s. If it takes the swimmer 180 s to cross the river, how wide is the river?
*October 4, 2012 by Garcia*

**Chemistry**

A spaceship from another planet travels at a speed of 4.27 googs/mulm. There are 256 googs in a meter and 8000 mulum in one hour. What is the spaceship speed in meters per second?
*October 16, 2012 by Kevin*

**Physics**

A bullet is fired from a rifle with a speed v0 at an angle č with respect to the horizontal axis from a cliff that is a height h above the ground below. Calculate the speed of the bullet when it strikes the ground.
*October 20, 2012 by Anne*

**Math**

A jet flew from Tokyo to Bangkok, a distance of 4800km. On the return trip the speed was decreased by 200km/h. If the difference times of the fights was 2 hours, what was the speed from Bangkok to Tokyo.
*January 20, 2013 by Emme*

**Dynamics**

the power developed by a man in riding up a 6 percent grade a ta constant speed is 200 W. the man and his bicycle have acombind mass of 80kg.determine the speed of riding.
*July 22, 2013 by sushil*

**dynamics**

the power developed by a man in riding up a 6percent grade at a constant speed is 200w.the man and his bicycle have a combinoed mass of 80kg.determined the speed of riding
*August 26, 2013 by nitin*

**Physics**

Suppose that the swimmer in the figure below has a swimming speed relative to the water of 0.45 m/s, while the speed of the current is 2.0 m/s. If it takes the swimmer 160 s to cross the river, how wide is the river?
*September 24, 2014 by Natalie*

**Physics**

Suppose that the swimmer in the figure below has a swimming speed relative to the water of 0.40 m/s, while the speed of the current is 2.2 m/s. If it takes the swimmer 200 s to cross the river, how wide is the river
*September 25, 2014 by Judy*

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