Sunday

April 20, 2014

April 20, 2014

Number of results: 28,467

**physics**

a motorboat is driven across a river at 5km/h at right angles to a current flowing at 3.9km/h. What is the resulting speed of the motorboat?
*Thursday, January 12, 2012 at 7:52pm by Crystal*

**physics**

A motorboat whose speed in still water is 3.00 m/s must aim upstream at an angle of 27.0^\circ (with respect to a line perpendicular to the shore) in order to travel directly across the stream. What is the speed of the current?
*Tuesday, September 21, 2010 at 3:02pm by Mark*

**math/physics**

A motorboat whose speed in still water is 3.00 m/s must aim upstream at an angle of 27.0 degrees (with respect to a line perpendicular to the shore) in order to travel directly across the stream. What is the speed of the current?
*Tuesday, September 21, 2010 at 4:21pm by cindy*

**Math**

A river flows at the rate of 2 mph. If a motorboat can travel 12 miles upstream and return in a total of 2.5 hours, what is the speed of the motorboat in still water?
*Monday, April 11, 2011 at 3:48pm by Anonymous*

**Anonymous**

A motorboat whose speed in still water is 2.86 m/s must aim upstream at an angle of 25.4 degrees (with respect to a line perpendicular to the shore) in order to travel directly across the stream.What is the resultant speed of the boat with respect to the shore?
*Monday, February 11, 2013 at 8:40pm by Anonymous*

**physics**

A 300kg motorboat is turned off as it approaches a dock and it coasts in toward the dock at .5 m/s. Isaac, whose mass is 62kg, jumps off the front of the boat with a speed of 3m/s relative to the boat. what is the velocity of the boat after Isaac jumps?
*Monday, July 19, 2010 at 7:32pm by Anonymous*

**physics**

A 300kg motorboat is turned off as it approaches a dock and it coasts in toward the dock at .5 m/s. Isaac, whose mass is 62kg, jumps off the front of the boat with a speed of 3m/s relative to the boat. what is the velocity of the boat after Isaac jumps?
*Wednesday, July 21, 2010 at 12:20am by Anonymous*

**Vectors**

a river is 2 km wide and flows at 4km/h. a motorboat has a speed of 10 km/h in still water and heads out from one bank. a marina is directly across the river, on the opposite bank. if the motorboat heads directly toward the marina, how far downstream from the marina will be on...
*Monday, March 12, 2012 at 10:45pm by Tarkan*

**Physics**

If a motorboat travels 25km/h towards the sea, down a river whose velocity is 4km/h what is the boats velocity related to the shore?
*Friday, March 21, 2014 at 4:31am by Ana*

**math**

a motorboat traveling with the curent went 68 miles in 3hrs and 24mins. against the current, it took 4hrs and 15 mins to travel the same distance. find the rate of the motorboat in calm water and the rate of the current.
*Tuesday, March 23, 2010 at 6:44pm by will*

**algebra**

A motorboat can maintain a constant speed of 24 mph relative to the water. The boat makes a trip upstream to a certain point in 62 minutes. the return trip takes 34 minutes. What is the speed of the current?
*Tuesday, September 20, 2011 at 4:06pm by Wen*

**algebra**

a motorboat can maintain a constant speed of 11 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 21 minutes; the return trip takes 1 minutes. That is the speed of the current?
*Thursday, January 27, 2011 at 9:43pm by shelby*

**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.
*Wednesday, June 19, 2013 at 8:49pm by kia*

**math**

A motorboat can maintain a constant speed of 16 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 20 minutes and the return trip takes 15 minutes. What is the speed of the current?
*Wednesday, September 3, 2008 at 8:04pm by leila*

**math**

A motorboat can maintain a constant speed of 16 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 20 minutes and the return trip takes 15 minutes. What is the speed of the current?
*Wednesday, September 3, 2008 at 9:34pm by leila*

**math**

a motorboat takes 5 hours to travel 45km downstream and then 18 km upstream on a river whose current flow of the rate of 3 km/hr. how fast can the boat travel in still water?
*Wednesday, March 6, 2013 at 9:48pm by sofia*

**Algebra**

A motorboat can maintain a constant speed of 26 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 35 minutes; the return trip takes 17 minutes. What is the speed of the river current?
*Saturday, September 8, 2012 at 6:15pm by Sandi*

**Physics Check**

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?
*Monday, July 12, 2010 at 2:31pm by ANA*

**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?
*Friday, April 15, 2011 at 1:32pm by aj*

**NEED HELP!! ALGEBRA**

A motorboat can maintain a constant speed of 26 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 35 minutes; the return trip takes 17 minutes. What is the speed of the river current?
*Sunday, September 9, 2012 at 11:54pm by Sandi*

**physics **

If a motorboat travels 25km/h towards the sea, down a river whose velocity is 4km/h what is the boats velocity related to the shore? A, 21 km/h B, 29km/h C, 25 km/h D, 4 km/h
*Friday, March 21, 2014 at 2:56pm by ana*

**Math**

a motorboat can go 24 miles downstream in the same amount of time that it takes to go 12 miles upstream. The boats speed in still water is 12 mph. What is the speed of the river? mi/hr?
*Thursday, April 5, 2012 at 1:25pm by Nancy*

**Algebra Continued**

2)A motorboat leaves a dock and travels at an average speed of 15mi/h toward an island. The average speed on the return trip is 10mi/h. How far is the island from the harbor if the total trip takes 5h? (HInt-first find the 2 times)
*Tuesday, September 23, 2008 at 10:24pm by Chris*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) With ...
*Friday, October 4, 2013 at 11:18pm by Jeff*

**physics**

(a) What is the escape speed on a spherical asteroid whose radius is 435 km and whose gravitational acceleration at the surface is 0.632 m/s2? (b) How far (in km) from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 535 m/s? (c) With ...
*Friday, October 4, 2013 at 11:19pm by Jeff*

**Math**

A boy started on a trip across a lake by motorboat. After he had traveled 15km, the motor failed and he had to use a banca for the remaining 6 km to his destination. His average speed by motor was 4kph faster than his average speed while rowing. If the entire trip took 5 1/2 ...
*Monday, August 23, 2010 at 12:30am by kay*

**Physics**

(a) What is the escape speed on a spherical asteroid whose radius is 535 km and whose gravitational acceleration at the surface is 3.0 m/s2? 1 ? m/s (b) How far from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 1000 m/s? 2 ? m (c) ...
*Monday, March 21, 2011 at 3:25pm by Steve*

**physics**

if a motorboat travels at 25km/hr down a river whose velocity is 4km/hr wgat is the boats actual velocity? a. 21km/hr b. 29km/hr c. 100km/hr d. 6.2km/hr please repost the answer
*Tuesday, March 18, 2008 at 2:11pm by michelle*

**Physics**

A motorboat traveling at a speed of 2.1 m/s shuts off its engines at t = 0. How far does it travel before coming to rest if it is noted that after 2.7 s its speed has dropped to half its original value? Assume that the drag force of the water is proportional to v. Please show ...
*Sunday, November 11, 2012 at 11:03am by Anonymous*

**math**

20. Miguel is driving his motorboat across a river. The speed of the boat in still water is 11 mi/h. The river flows directly south at 2 mi/h. If Miguel heads directly west, what are the boat’s resultant speed and direction?
*Wednesday, December 26, 2012 at 2:31pm by bre*

**vectors components**

plz answer my question a river is 2 km wide and flows at 4km/h. a motorboat has a speed of 10 km/h in still water and heads out from one bank. a marina is directly across the river, on the opposite bank. if the motorboat heads directly toward the marina, how far downstream ...
*Sunday, March 18, 2012 at 8:04pm by tarkan*

**geometry**

Miguel is driving his motorboat across a river. The speed of the boat in still water is 10 mi/h. The river flows directly south at 3 mi/h. If Miguel heads directly west, what are the boat’s resultant speed and direction? Round answers to the nearest tenth.
*Monday, February 27, 2012 at 11:03am by hiba*

**College Physics w/Calculus**

(a) What is the escape speed on a spherical asteroid whose radius is 570 km and whose gravitational acceleration at the surface is 3.1 m/s2? (b) How far from the surface will a particle go if it leaves the asteroid's surface with a radial speed of 1000 m/s? (c) With what speed...
*Tuesday, December 14, 2010 at 5:24pm by Oriana*

**Math**

first, recall that speed, v, is distance traveled over a certain period of time: v=d/t thus t=d/v *we'll need this equation later* represent the unknowns using variables: let x = average speed of motorboat (in kph) let y = average speed of rowing (in kph) set-up the equations...
*Monday, August 23, 2010 at 12:30am by jai*

**college physics**

a railway freightbcar whose mass is 15 000kg & speed is 2.4m/s runs into a stationary freight car whose mass is 25 000kg. the 2 cars couple & roll off the track. what is the speed if the 2 cars as tey move together down the track? and how much kinetic energy is lost in the ...
*Tuesday, November 29, 2011 at 9:56pm by barbara*

**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...
*Monday, March 24, 2014 at 9:57am by Tsion*

**intermediate algebra**

a motorboat moves 25 miles per hour in still water. it travels 21 miles upstream and 21 miles downstream in a total time of 2.0 hours. whatis the speed of the current?
*Sunday, October 6, 2013 at 5:33pm by Ernie*

**Physics**

A hoop of mass M = 3 kg and radius R = 0.5 m rolls without slipping down a hill, as shown in the figure. The lack of slipping means that when the center of mass of the hoop has speed v, the tangential speed of the hoop relative to the center of mass is also equal to vCM, since...
*Friday, November 18, 2011 at 9:37pm by Nho Neim*

**Physics**

A rower whose speed of rowing is u crosses a river of width s to a point exactly opposite. Find the time of the journey if the speed of the stream is V( less than u)
*Friday, February 14, 2014 at 8:47pm by Glory*

**Math **

This is also another problem that I'm having trouble on. A motorboat can maintain a constant speed of 16 miles per hour relative to the water. The boat makes a trip upstream to a certain point in 20 minutes; the return trip takes 15 minutes. What is the speed of the current? ...
*Thursday, September 16, 2010 at 12:47am by amy*

**Algebra**

Cody’s motorboat took 3 hr to make a trip downstream with a 6-mph current. The return trip against the same current took 5 hr. Find the speed of the boat in still water
*Tuesday, February 22, 2011 at 9:08am by Joel*

**physics111**

a river flows due south with a speed of 2.0m/s. a man steers a motorboat across the river;his velosity is 4.2m/s due east.the river is 800m wide. (A) what is his velocity(magnitude and direction)relative to the earth? (B)how much time is required to cross the river?
*Tuesday, April 2, 2013 at 9:33am by yonela*

**Physics**

A boat’s speed in still water is 1.95m/s . The boat is to travel directly across a river whose current has speed 1.20m/s . Determine the speed of the boat with respect to the shore. Despite, I did it like taking the sqrt (1.95^2+1.20^2) is there something wrong I did? ...
*Wednesday, October 17, 2012 at 3:13pm by Kaan*

**physics**

Two boat landings are 6.0 km apart on the same bank of a stream that flows at 2.8 km/h. A motorboat makes the round trip between the two landings in 50 minutes. What is the speed of the boat relative to the water?
*Wednesday, September 14, 2011 at 8:43pm by Ashley*

**math algebra**

Paul Websters motorboat can travel 15 mph in still water. Traveling with the current of a river, the boat can travel 20 miles in the same time it takes to go 10 miles againt the current. Find the speed of the current.
*Tuesday, April 23, 2013 at 7:57pm by alms*

**Science**

If a yo yo has a speed of 3 m/s at the top of the circle, whose radius is 80 cm, What is its speed at the bottom
*Friday, September 21, 2012 at 10:25am by Andtrew*

**Physics**

A motorboat heads due east at 8.5 m/s across a river that flows to the south at a speed of 2.5 m/s. a. What is the velocity of the boat relative to a stationary observer on the shore? B. If the river is 1360 m wide, how long does it take the boat to cross the river? C. How far...
*Tuesday, January 4, 2011 at 9:52pm by Lilah*

**physical science**

a yo-yo is swung in a vertical circle in such a way that its total energy KE and PE is constant. At what point in the circle is this speed maximum? A minumum? why? (b) if the yo-yo has a speed of 3 m/s at the top of the circl, whose radius is 80 cm, what is tis speed at the ...
*Wednesday, September 19, 2012 at 4:50pm by tracey*

**Intro to Physical Science**

A car whose mass is 1000 kg is traveling at a constant speed of 10 m/s Neglecting any friction, how much force will the engine have to supply to keep going the same speed?
*Monday, April 18, 2011 at 9:51pm by Anonymous*

**Intro to Physical Science**

A car whose mass is 1000 kg is traveling at a constant speed of 10 m/s Neglecting any friction, how much force will the engine have to supply to keep going the same speed?
*Monday, April 18, 2011 at 9:52pm by Anonymous*

**Physics**

A river flows due south with a speed of 2.00 m/s. A man steers a motorboat across the river; his velocity relative to the water is 4.20 m/s due east. The river is 800 m wide. What is the magnitude of his velocity relative to the earth? got it....4.65 m/s What is the direction ...
*Saturday, September 16, 2006 at 4:07pm by Josh*

**Algebra! Help needed!**

I'm having a little trouble with this problem... Please try and walk me through the problem, too: #1. A motorboat leaves a dock and travels at an average speed of 15 mi/h toward an island. The average speed on the return trip is 10 mi/h. How far is the island from the harbor ...
*Thursday, November 20, 2008 at 5:19pm by Celina*

**biology**

a woman whose father had hemophilia and whose mother was normal married a man whose father did not have hemophilia but whose mother did . if the couple's first child was a son what are the chances that he would show the trait of hemophilia?
*Wednesday, June 19, 2013 at 6:16am by gwen*

**Physics**

The engine of a motorboat delivers 30.0 kW to the propeller while the boat is moving at 15.0m/s. What would be the tension in the towline if the boat were being towed at the same speed? I know to use P=Fv and solve for F so P = 3000kN right because 1 kW = 1000 Watts... and v= ...
*Monday, June 22, 2009 at 1:51pm by Sarah*

**calculus**

An automobile travels at a constant speed around a curve whose radius of curvature is 2000m. What is the maximum allowable speed if the maximum acceptable value for the normal scalar component of acceleration is 1.5m/s squared?
*Wednesday, April 24, 2013 at 11:38am by aimi najwa*

**Algebra**

I'm having a little trouble with this problem... Please try and walk me through the problem, too: #1. A motorboat leaves a dock and travels at an average speed of 15 mi/h toward an island. The average speed on the return trip is 10 mi/h. How far is the island from the harbor ...
*Thursday, November 20, 2008 at 4:43pm by Celina*

**maths**

22. A motor boat whose speed is 18 km/h in still water takes 1 hour more to go 24 km upstream than to return downstream to the same spot. Find the speed of the stream
*Saturday, March 6, 2010 at 7:38am by kaur*

**math**

Find the lateral area of a regular pyrmid whose base is a sqauare, whose slant height is 5 m, and whose height is 3 m. I need help.
*Sunday, November 11, 2007 at 9:57pm by keisha*

**math**

Find the lateral area of a regular pyramid whose base is a square whose slant height is 5 m, and whose height is 3 m. I don't understand this. I need help.
*Sunday, November 11, 2007 at 1:47pm by monica*

**physics**

A boat’s speed in still water is vBW = 1.85 m/s. If the boat is to travel directly across a river whose current has speed vWS = 1.20 m/s, at what upstream angle must the boat head?
*Tuesday, November 15, 2011 at 1:01pm by ahmed*

**Mechanics**

A 1000-kg car whose motor delivers a maximum power of 40.0 hp to its wheel can maintain a steady speed of 130 km/h on a horizontal roadway. How large is the friction force that impedes its motion at this speed? Show the solution and answer
*Sunday, September 15, 2013 at 12:37am by Jason*

**algebra**

A motorvoat goes 36 miles upstream on a river whose current is running at 3 miles per hour. The trip up and back takes 5 hours. What is the speed of the boat ( assuming that it maintains a constant speed relative to the water)?
*Monday, April 4, 2011 at 1:00pm by jjj*

**CALCULUS-GUYS..PLEASE HELP...THIS DUE TOMORROW..**

An automobile travels at a constant speed around a curve whose radius of curvature is 2000m. What is the maximum allowable speed if the maximum acceptable value for the normal scalar component of acceleration is 1.5m/s^2?
*Wednesday, April 24, 2013 at 11:49am by aimi najwa*

** 11th grade maths**

A.give an example of a function whose domain is {3,4,7,9}? and whose range is {-1,0,3} B.Find two different functions whose domain is {3,8}and whose range is {-4,1} C Explain why there does not exist a function whose domain is {-1,0,3} and whose range is [3,4,7,9} D.Give an ...
*Monday, September 17, 2012 at 2:37am by fatima*

**physcis**

Boat A negotiates a curve whose radius is 375 m. Boat B negotiates a curve whose radius is 150 m. Each boat experiences the same centripetal acceleration. What is the ratio of the speed of boat A to that of boat B?
*Sunday, February 19, 2012 at 2:04pm by KayLyn*

**physics**

Boat A negotiates a curve whose radius is 336 m. Boat B negotiates a curve whose radius is 160 m. Each boat experiences the same centripetal acceleration. What is the ratio of the speed of boat A to that of boat B?
*Sunday, February 19, 2012 at 8:57pm by Shelby*

**physics**

A ball with an initial speed of = 18.5 m/s collides elastically with two identical balls whose centers are on a line perpendicular to the initial velocity and that are initially in contact with each other. The first ball is aimed directly at the contact point and all motion is...
*Monday, October 10, 2011 at 8:18pm by Kancho*

**physics**

In 9.2 s a fisherman winds 2.1 m of fishing line onto a reel whose radius is 3.0 cm (assumed to be constant as an approximation). The line is being reeled in at a constant speed. Determine the angular speed of the reel.
*Thursday, November 18, 2010 at 11:21am by michelle*

**physics**

In 8.6 s a fisherman winds 2.7 m of fishing line onto a reel whose radius is 3.0 cm (assumed to be constant as an approximation). The line is being reeled in at a constant speed. Determine the angular speed of the reel.
*Saturday, November 20, 2010 at 5:42am by mackenzie*

**physics..**

what's the density of a box whose weight is 1648 newtons and whose volume is 2.8 cubic meters? Will it float in a liquid whose density is 600 kilograms per cubic meter?
*Thursday, May 24, 2012 at 6:45pm by Jen*

**Physics**

In 9.7 s a fisherman winds 2.1 m of fishing line onto a reel whose radius is 30 cm (assumed to be constant as an approximation). The line is reeled in at constant speed. Determine the angular speed of the reel in rad/s. Thank you.
*Saturday, February 25, 2012 at 8:47am by Nilan*

**Phys**

What is the speed of a wave whose frequency is 9.00Hz and wavelength is 0.654 m?
*Thursday, April 12, 2012 at 5:06pm by Jason*

**Physics**

What is the speed of a wave whose frequency is 9.00Hz and wavelength is 0.654m?
*Thursday, April 12, 2012 at 9:49pm by Alex*

**Physics**

What is the speed of a proton whose kinetic energy is 12.9 keV?
*Sunday, January 26, 2014 at 3:37am by Anonymous*

**8th Grade Science**

A runner whose initial speed is 29 km/hr increases her speed to 31 km/hr in order to win a race. If the runner takes 0.5 seconds to complete this increase in speed, what is her acceleration? I think it's either 1440 km/hr/hr or 0.4 km/hr/sec. Are you supposed to convert the ...
*Tuesday, January 10, 2012 at 8:51pm by Anya*

**physics**

A ball whose mass is 0.3 kg hits the floor with a speed of 7 m/s and rebounds upward with a speed of 5 m/s. If the ball was in contact with the floor for 0.5 ms (0.5multiply10-3 s), what was the average magnitude of the force exerted on the ball by the floor?
*Thursday, October 28, 2010 at 2:48pm by Anonymous*

**Physics - still confused -Please help**

In 9.7 s a fisherman winds 2.1 m of fishing line onto a reel whose radius is 30 cm (assumed to be constant as an approximation). The line is reeled in at constant speed. Determine the angular speed of the reel in rad/s. Thank you.
*Saturday, February 25, 2012 at 10:36am by Nilan*

**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?
*Saturday, February 9, 2013 at 8:18pm by chelsea*

**science**

the speed of a 5000-kg truck whose KE is 360 kJ is how many m/s?
*Sunday, February 17, 2008 at 4:20pm by janeen*

**Lubrication**

A pump fitted with 50mm bore ball bearings uses an oil whose viscosity ranges from 100cSt at cold pump start-up to 7.5Cst when running at maximum speed and load. If these viscosities are the safe limits for the oil, specify the maximum start-up speed and the maximum running ...
*Monday, September 23, 2013 at 1:48am by Tony*

**physics**

A motorboat traveling on a straight course slows down uniformly from 75km/h to 40km/h in a distance of 50m. What is the boat’s acceleration?
*Thursday, October 28, 2010 at 4:17pm by Jay*

**physics**

A motorboat traveling on a straight course slows down uniformly from 75km/h to 40km/h in a distance of 50m. What is the boat’s acceleration?
*Thursday, October 28, 2010 at 4:24pm by Jay*

**Vectors**

I hope that the diagram I have drawn for myself matches the one in your question. I have a triangle with sides 20 and 10 and an angle of 120º between them By the cosine law I found the third side to be 26.4575. You said you found the maginitude, I hope we match. After that, ...
*Friday, April 20, 2007 at 8:55am by Reiny*

**physics**

A child whose weight is 281 N slides down a 6.20 m playground slide that makes an angle of 45.0¡ã with the horizontal. The coefficient of kinetic friction between slide and child is 0.160. (a) How much energy is transferred to thermal energy? (b) If she starts at the top with ...
*Sunday, May 6, 2012 at 10:23pm by harrison*

**Math**

A boat, whose speed in still water is 2.80m/s , must cross a 280m wide river and arrive at a point 120m upstream from where it starts. To do so, the pilot must head the boat at a 45.0 degrees upstream angle. What is the speed of the river's current?
*Saturday, September 12, 2009 at 1:12pm by Anne*

**Science**

Calculate the acceleration of a turtle whose speed changes from 3 m/s to 72 m/s over a period of 17 seconds.
*Saturday, April 14, 2012 at 7:21pm by Suzie*

**precalculus**

How do you do this question? 1. A speed versus time graph shows the segment from (3, 4) to (8,4). The units for the vertical axis are m/s. If the object whose speed was being graphed is 8 m away from the point from which measurements are made at t= 3s, how far away is the ...
*Saturday, December 3, 2011 at 2:15am by Melinda*

**Physics**

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? assume ...
*Wednesday, August 14, 2013 at 12:38am by Jam*

**Calculus**

A man 2m tall walks away from a lamppost whose light is 5m above the ground. If he walks at a speed of 1.5m/s, at what rate is his shadow growing when he is 10m from the lamppost? I tried to draw a diagram, but I don't understand where the 5m is, the height of the lamppost? Is...
*Tuesday, December 1, 2009 at 11:18pm by sh*

**Physics**

calculate the initial speed of a bicyclist whose final velocity is 20m/s if he accelerates at a rate of 2 m/s2 in 5 seconds?
*Wednesday, January 11, 2012 at 8:35pm by Arshel*

**physics**

A mine car, whose mass is 590 kg, rolls at a speed of 0.5 m/s on a horizontal track, as the drawing shows. A 150 kg chunk of coal has a speed of 0.95 m/s when it leaves the chute. Determine the velocity of the car/coal system after the coal has come to rest in the car.
*Tuesday, October 14, 2008 at 9:29pm by kb*

**Physics**

A car whose speed is 90.0 km/h (25 m/s) rounds a curve 180 m in radius that is properly banked for speed of 45 km/h (12.5 m/s). Find the minimum coefficient of friction between tires and road that will permit the car to make a turn. What will happen to the car in this case? My...
*Wednesday, August 15, 2012 at 9:58am by TJR*

**physics**

A particle has a kinetic energy equal to its rest energy. (a) What is the speed of this particle? (b) If the kinetic energy of this particle is doubled, does its speed increase by more than, less than, or exactly a factor of 2? (c) Explain (d) Calculate the speed of a particle...
*Saturday, April 28, 2012 at 2:57am by martini*

**Math**

How many cubic units are in the volume of a cylinder whose height is four units and whose radius is five units? What is the surface area of a cube whose volume is 27 cubic inches?
*Thursday, November 11, 2010 at 9:05pm by Nika*

**Physics**

Standing on the surface of a small spherical moon whose radius is 6.30 104 m and whose mass is 8.00 1018 kg, an astronaut throws a rock of mass 2.02 kg straight upward with an initial speed 42.2 m/s. (This moon is too small to have an atmosphere.) What maximum height above the...
*Thursday, June 28, 2012 at 3:19pm by James*

**physics**

How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 2900 m?
*Saturday, October 23, 2010 at 12:01pm by bill*

**Physics**

How long does it take a plane, traveling at a speed of 170 m/s, to fly once around a circle whose radius is 3500 m?
*Sunday, October 30, 2011 at 6:17pm by Jessi*

**ethics**

Whose policies? Whose treatment? Please clarify and we'll be glad to try and help you.
*Thursday, December 18, 2008 at 9:23pm by Ms. Sue*

**math**

find two numbers whose product is N^2 and whose sum is a minimum
*Monday, February 14, 2011 at 12:42am by cheryl*

**physics**

How long does it take a plane, traveling at a constant speed of 160 m/s, to fly once around a circle whose radius is 3450 m?
*Monday, January 24, 2011 at 8:05pm by lucey*

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