Thursday
April 24, 2014

Search: the speed of a 4.0 N hockey puck, sliding across a level surface of ice

Number of results: 18,999

10th grade Academic Math
hi can you help me with this problem please, thank you.----------------- If the speed of an experimental car is decreased by 8km/h it completes a 140 km trip in 2 hours more than had it been traveling at its usual speed. Determine its usual speed.
Monday, June 7, 2010 at 7:29pm by Neil

Intermediate algebra
Hello, I am kind stuck on this question In the lab you discover a relationship between the temperature of the air and the speed of sound. You find the speed of sound is never lower than 331 m/s and increases by 60% of the current temperature. a. What is the equation from this ...
Monday, November 28, 2011 at 9:55pm by Jennifer

physics
a wheelof diameter 0.70 meterolls without slipping. a point at the top of the wheel moves with a tangential speed of 2.0 meter/second. a) at what speed is the axis of the wheel moving? b) What is the angular speed of the wheel?
Monday, March 24, 2014 at 1:10pm by Anonymous

Calculus
The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400) a)If the speed limit is 50 km/h, determine the legal speed that will maximize the fuel efficiency. Could someone explain to me why the legal speed is 50 km/h to maximize...
Monday, March 5, 2012 at 2:36pm by Jessica

math
a bus takes 12 hours to travel the same distance that an airplane travels in 1.5 hours. the average speed of the airplane ia 120 km per hour faster than five times the average speed of the bus. what is the average speed of the bus? let x represent the speed of the bus speed of...
Wednesday, November 29, 2006 at 2:33pm by aaron

Math
An aircraft flew 3hrs with the wind. The return trip took 4hrs against the wind. If the speed of the plane in still air is 180mph more than the speed of the wind, find the wind speed and the speed of the plane in still air.
Tuesday, September 27, 2011 at 11:34pm by Ingrid

physics
if a stone at the end of a string is whirled in a circle, the inward pull on the stone A) is known as the centrifugal force B) is inversely proportional to the speed of the object C) is inversely proportional to the square of the speed D) is proportional to the speed E) is ...
Monday, May 28, 2012 at 9:58am by star

physics - SHM
Calculate the speed of the pulse from the following: y(x,t) = 2/((x - 3t)^2 + 1) Well the speed of the pulse is given by: y(x,t) = f (x - vt) for a pulse traveling to the right and y(x,t) = f (x + vt) for a pulse traveling to the left but in this case the function is (x - 3t)^...
Saturday, April 14, 2007 at 5:47pm by COFFEE

Physics
Starting from rest, a 6.70 kg object falls through some liquid and experiences a resistive (drag) force that is linearly proportional to the velocity of the object. It's measured that the object reaches half its terminal speed at 4.50 s. a) What is the terminal speed for this ...
Thursday, July 26, 2012 at 11:59am by Zac

physics
An athlete executing a long jumper leaves the ground at a 27.0 degree angle and travels 7.89 m. What was the takeoff speed? If this speed were increased by just 5.0%, how much longer would the jump be? I came up with a take off speed of 27.4 but the system is saying that is ...
Wednesday, September 22, 2010 at 12:53pm by jason

physics
A girl riding a bicycle with a speed of 5m/s towards northdirection , observes rain falling vertically down. If she increases her speed to 10m/s , rain appears to meet her at 45degree tp the vertical .what is the speed of rain ?
Tuesday, August 28, 2012 at 11:15am by manish dagar

MATH
THE AVERAGE WIND SPEED INCREASED 19 MILES/H FROM 8 AM TO 12 NOON. THE AVERAGE WIND SPEED DECREASED 5 MI MI/H FROM 12 NOON TO 4 PM. AT 4 PM, THE AVERAGE WIND SPEED WAS AT LEAST 32 MI/H. WHAT IS THE MINIMUM VALUE OF THE AVERAGE WIND SPEED AT 8 AM? NEED TO SOLVE AN INEQUALITY ...
Wednesday, November 30, 2011 at 12:46am by Justin

College Physics
a horizontal speed of 15.8 m/s and a vertical speed 10.0 m/s upward. What is the vertical speed 1.12 s later?
Sunday, September 26, 2010 at 3:22pm by J

PHYSICS 3
A solid disk (mass = 1 kg, R=0.5 m) is rolling across a table with a translational speed of 9 m/s. a.) What must the angular speed of the disk be? rad/s d.) The disk then rolls up a hill of height 2 m, where the ground again levels out. Find the translational and rotational ...
Monday, October 20, 2008 at 4:34am by kelsey

physicsss
A Thompson’s gazelle can reach a speed of 13 m/s in 3.0 s. A lion can reach a speed of 9.5 m/s in 1.0 s. A trout can reach a speed of 2.8 m/s in 0.12 s. Which animal has the greatest acceleration?
Thursday, October 28, 2010 at 3:56pm by Jay

physics
A .50kg ball is rolling on a frictionless surface at a speed of .75m/s. it collides with a second ball with a mass of 1kg which is also moving in the same direction as the first ball with a speed of .38m/s. After the collision the firt ball continues at a reduced speed of .35m...
Saturday, March 26, 2011 at 5:44pm by Mari

math
a car travels at a constants speed and uses G(x) litres of gas per kilomotre, where x is the speed of the car in kilomotres oer hour and G(x)=(1280+x^2)/(320x) a>if fuel costs 1.29 per litre, determine the cost function C(x)that expresses the cost of the fuel for a 200KM ...
Monday, October 31, 2011 at 10:14pm by invy

physics
the earthis moving around the sun in a circular orbit of radius 1.5*10^11. it makes one revolution per year.find the angular speed of earth in radian/sec, and the tangential speed of earth using the formula v=r.w , and tangetial speed ?
Sunday, April 25, 2010 at 10:29pm by mo

physics
a patrol of timing paths each vehicle needs to travel the first half of the distance at a speed of 140 km / h. if the speed limit is 80km / h. which should be the highest average speed of the car in the second half of the section, to avoid being fined?
Sunday, October 10, 2010 at 12:09am by liz

Physics
a steel ball drops onto a thick steel plate. its speed just before it hits is 10 m/s and it rebounds with a speed of 9 m/s. what percentage of its kinetic energy did it lose during the collision? what would you expect its speed to be after the second rebound?
Thursday, September 6, 2012 at 7:29pm by Megan

Physics
A GPS satellite orbits at an altitude of 2.0 x 10^7 m and a speed of 3.9 x 10^3 m/s, Earth’s radius is 6.4 x 10^6 m, and a point at its equator has tangential speed of 460 m/s, By approximately what fraction must the time be adjusted to account for both regular/speed-dependent...
Monday, January 21, 2013 at 8:53pm by Katie

Science
What is the distance an object travels per unit of time? It's called the speed Depends on the velocity (speed), if the speed is 10mph, then the object would travel 10 miles (distance) per hour (unit of time). I'm unsure what your answer is saying, because velocity and speed ...
Monday, September 18, 2006 at 10:17pm by Ginger

Algebra
During the first part of a trip, a canoeist travels 57 miles at a certain speed. The canoeist travels 13 miles on the second trip at a speed 5 mph slower. The total time for the trip is 5 hrs. what was the speed on each part of the trip? The speed on the first part is? The ...
Sunday, April 22, 2012 at 3:36pm by Stella

Physics
A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.20x10^4 rad/s to an angular speed of 3.14x10^4 rad/s. In the process, the bit turns through 1.92x10^4 rad. Assuming a constant angular acceleration, how long would it take the bit to reach ...
Tuesday, October 23, 2012 at 8:38am by Sam

Physics
A centrifuge takes 100 s to spin up from rest to its final angular speed with constant angular acceleration. If a point located 8.00 cm from the axis of rotation of the centrifuge moves with a speed of 150 m/s when the centrifuge is at full speed, how many revolutions does the...
Sunday, June 24, 2012 at 7:12pm by Bloom

Physics
Car A and B are passing each other in different lanes. Car A has an initial speed of 15m/s and is gaining speed at 1.5m/s^2. Car B has an initial speed of 20m/s and is gaining speed at 2.0m/s^2. Find when and where the cars will pass one another and their speeds as they are ...
Wednesday, February 20, 2008 at 8:02am by Anonymous

algebra
With a tailwind, a bird flew at a ground speed of 3 mi/hr. Flying the same path against the same wind, the bird travels at a ground speed of 1.5 mi/hr. What is the bird's air speed? What is the wind speed?
Sunday, February 5, 2012 at 10:47pm by tean

Algrebra
with a tailwind, a bird flew at a ground speed of 3 mi/h. Flying the same path against the same wind, the bird travels at a ground speed of 1.5 mi/h. What is the bird's air speed? What is the wind speed?
Tuesday, January 21, 2014 at 9:59pm by Nathan

Physics
A car is driven from point A to B at a constant speed of 25.0 m/s along a straight line, and then back from point B to A at a constant speed of 20.0 m/s. The values of the average speed over the entire trip is?
Tuesday, January 19, 2010 at 6:58pm by Mandy

physics
If a car completes a 3.8 mi oval track in 69.7 s, what is the average speed? answer in mph Did the car accelerate? (A.yes the direction of the motion changed or B. yes the speed changed or C. no the speed didnt change)
Tuesday, June 14, 2011 at 12:11am by alexa

physics
If a runner travels at a speed of 10 m/s for 5 seconds, stops for a short time then continues on at a speed of 8 m/s for 4 seconds. How long was the runner stopped for if his average speed at the end of the trip is 4 m/s.
Tuesday, February 22, 2011 at 10:25pm by mikey

waves and optics
Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons passing through water with ...
Sunday, May 27, 2012 at 6:42pm by jennifer

college physics
A car is driven from point A to B at a constant speed of 25.0 m/s along a straight line, and then back from point B to A at a constant speed of 20.0 m/s. The values of the average speed over the entire trip is?
Tuesday, January 19, 2010 at 7:20pm by Mandy

Physics
Tarzan swings on a 27.0 m long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest?(b) What is his speed at the bottom of the swing if he pushes off with a speed of 3.00 m/s?
Wednesday, March 10, 2010 at 1:25pm by Kelsey

Calculus
The fuel efficiency, E, in litres per 100 km, for a car driven at speed v, in km/h is E(v)=1600v/(v^2+6400) a) determine the legal speed that will maximize the fuel efficiency using speed limit of 50 km/h
Friday, February 24, 2012 at 11:03pm by Jake

physics
Tarzan swings on a 34.0-m-long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest? m/s (b) What is his speed at the bottom of the swing if he pushes off with a speed of 5.00 m/s? m/s
Wednesday, October 10, 2012 at 11:25pm by monic

physics
A supersonic jet flying at 137 m/s is accelerated uniformly at the rate of 23.1 m/s2 for 20.0 s. (a) What is its final velocity? (b) The speed of sound in air is 331 m/s. How many times the speed of sound is the plane's final speed?
Tuesday, October 23, 2012 at 9:24pm by miranda

physics
a boy walks to a school at a rate of 6km with a speed of 2.5km/h and walks back with a constant speed of 5km/h. his average speed for round trip in km/h is ?
Saturday, June 25, 2011 at 11:16am by aleeza

physics
The speed of an automobile increases from 11 m/s to a speed of 47 m/s over a time period of 9.0 seconds. What is the average rate at which the speed of this car is changing during this time period?
Friday, September 2, 2011 at 11:03am by Anonymous

science/math
A car travels up a hill at a constant speed of 45 km/h and returns down the hill at a constant speed of 70 km/h. Calculate the average speed for the round trip.
Saturday, September 24, 2011 at 2:54pm by Jonathan

physics
If a race car completes a 3 mi oval track in 50 s, what is its average speed? Did the car accelerate? 1. Yes, the speed changed. 2. No, the speed didn’t change. 3. Yes, the direction of the motion changed.
Sunday, September 25, 2011 at 10:31am by anon

Physics
A sound wave in a solid has a frequency of 15.0 kHz and a wavelength of 0.333 m. What would be the wave speed, and how much faster is this speed than the speed of sound in air?
Tuesday, March 4, 2014 at 10:45pm by Melanie

Physics, science
A billiard ball moving with a speed of +4 m/s runs head on into the back of another ball moving with a speed of +2 m/s. After the collision the first ball was measured to be moving with a speed of +2 m/s. Find the speed of the second ball. formula = mivi+m2v2= mivi+m2v2 so far...
Sunday, December 18, 2011 at 7:24pm by Bassel

physics
In 1954, Roger Bannister became the first human to run a mile in less than 4 minutes. Suppose that a runner on a straight track covers a distance of 1.00 mi in exactly 4.00 min. 1. What is his average speed in mi/h? 2. What is his average speed in ft/s? 3. What is his average ...
Thursday, January 20, 2011 at 12:31am by andrea

physics....
Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons passing through water with ...
Thursday, June 21, 2012 at 10:58pm by matin

Physics, please help me today.
four pulleys are connected by two belts. Pulley A (radius 15cm) is the drive pulley and it rotates at 10 rad/s. Pulley B (radius 10 cm) is connected by belt 1 to pulley A. Pulley B' (radius 5cm) is concentric with pulley B and is rigidly attached to it. Pulley C (radius 25cm) ...
Friday, November 17, 2006 at 10:48am by Dawn

physics
A passenger on a stopped bus notices that rain is falling vertically just outside the window. When the bus moves with constant velocity, the passenger observes that the falling raindrops are now making an angle of 18 with respect to the vertical. What is the ratio of the speed...
Monday, September 5, 2011 at 4:42pm by cassie

Physics - Doppler Effect
The siren in an ambulance has a frequency (according to you) of 1100 hz as it moves towards you at a speed v. It then makes a u-turn and travels away from you with a speed v, and you hear a frequency of 950 hz. What is the final speed v of the siren?
Monday, March 28, 2011 at 9:06pm by J Velji

physics
A cyclist enters a curve of 30 m radius at a speed of 12 m s-1. He applies the brakes and decreases his speed at a constant rate of 0.5 m s-2. Calculate the cyclist’s centripetal (radial) [3 marks] and tangential [15 marks] accelerations when he is travelling at a speed of 10 ...
Tuesday, February 28, 2012 at 10:27am by alex

math
A cyclist bikes at a constant speed for 18 miles. He then returns home at the same speed but takes a different route. His return trip takes one hour longer and is 23 miles. Find his speed.
Monday, July 23, 2012 at 12:00am by john

Physics
A car is speeding up and has an instantaneous speed of 14.2 m/s when a stopwatch reads 9.1 s. It has a constant acceleration of 1.8 m/s^2. (a) What change in speed occurs between t = 9.1 s and t = 12.6 s? (b) What is the speed when the stopwatch reads 12.6 s?
Wednesday, September 23, 2009 at 11:27pm by Megan

Physics
A car travels up a hill at a constant speed of 33 km/h and returns down the hill at a constant speed of 60 km/h. Calculate the average speed (in km/h) for the round trip.
Sunday, January 16, 2011 at 2:27pm by Ethan

physics
A car travels up a hill at a constant speed of 45 km/h and returns down the hill at a constant speed of 70 km/h. Calculate the average speed for the round trip.
Thursday, September 22, 2011 at 9:16pm by Jonoathan

physics
A car travels up a hill at a constant speed of 45 km/h and returns down the hill at a constant speed of 70 km/h. Calculate the average speed for the round trip.
Thursday, September 22, 2011 at 9:16pm by Jonoathan

physics
A car travels up a hill at a constant speed of 45 km/h and returns down the hill at a constant speed of 70 km/h. Calculate the average speed for the round trip.
Thursday, September 22, 2011 at 9:16pm by Jonoathan

Physics
Car travels up hill at a constant speed of 50 km/h and returns down the hill at a constant speed of 65 km/h. Calculate the avg speed for the round trip in km/h.
Thursday, September 22, 2011 at 10:13pm by JP

waves
A skipper on a boat notices wave crests passing his anchor chain every 5 s. He estimates the distance between wavecrests to be 15 m. He also correctly estimates the speed of the waves. What is the speed? Speed = (wavelength) x (frequency) = (15 m)[1/(5 s)] = 3 m/s
Monday, June 27, 2005 at 11:18pm by Jarrad Michael

Calculus/Vectors
An airplane heads due south with an air speed of 480km/h. Measurements made from the ground indicate that the plane's ground speed is 528km/h at 15 degrees east of south. Calculate the wind speed.
Monday, May 2, 2011 at 4:07pm by Anonymous

College algebra
A cyclist bikes at a constant speed for 18 miles. He then returns home at the same speed, but takes a different route. His return trip takes one hour longer and is 23 miles. Find his speed
Friday, June 22, 2012 at 10:54am by Anonymous

maths
A man travels from town a to b at an average speed of 90km/h.on his return journey he takes (one)1 hour less and his speed is 10km/h faster......1.how far apart are towns a and b, ............. ..2.what Is his average speed from town a to b and back to a ..
Thursday, April 11, 2013 at 3:08pm by mohammed

physics
in 1954 roger bannister became the first human to run a mile in less than 4 minutes. suppose that a runner on a straight track covers a distance of 1.00 mi in exactly 4.00 min. What is the average speed in mi/h What is his average speed in ft/s what is his average speed in m/s...
Monday, September 16, 2013 at 10:51pm by deb

physics
A 0.46 kg object connected to a light spring with a spring constant of 18.0 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the mass. unit = cm/s (b) Determine the speed of the mass...
Tuesday, March 22, 2011 at 6:36pm by :)

College Physics - Speed
Traveling at a speed of 15.6 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 1.25 s have elapsed? Ignore the effects of ...
Wednesday, March 14, 2012 at 9:03pm by Anonymous

trig
A barge is pulled by two tugboats. The first tugboat is traveling at a speed of 12 knots with heading 140°, and the second tugboat is traveling at a speed of 17 knots with heading 200°. Find the resulting speed and direction of the barge. (Round your answers to the nearest ...
Sunday, July 21, 2013 at 10:58pm by Priscilla

physics
A car travels up a hill at a constant speed of 32 km/h and returns down the hill at a constant speed of 61 km/h. Calculate the average speed and the answer is not 46.5
Monday, September 19, 2011 at 4:10pm by Ann2793

Physics 141
A 45.0-kg skater is traveling due east at a speed of 2.85 m/s. A 72.5-kg skater is moving due south at a speed of 7.35 m/s. They collide and hold on to each other after the collision, managing to move off at an angle θ south of east, with a speed of vf. Find the following...
Tuesday, March 11, 2014 at 9:00pm by dakota22

physical science
Which of the following four bodies has the greatest kinetic energy? a. A body of mass 1 kg moving with speed 1000 m/s. b. A body of mass 2 kg moving with speed 50 m/s c. A body of mass 3 kg moving with speed 50 m/s d. A body of mass 50 kg moving with speed 2 m/s e. A body of ...
Thursday, December 15, 2011 at 8:25pm by Fonda

Science
You are in a speedboat on a river moving in the same direction as the current. The speedometer on the boat shows that its speed is 50 km/h. However, a person on the shore meansures the boat's speed as 57 km/h. How is this possible? The answer is somehow related to the speed of...
Thursday, March 20, 2008 at 10:37pm by Trissy

science
An earth satellite in an elliptial orbit moves with a) slower speed as it ages b) none of the above c) constant speed d) faster speed as it ages Just need to know if my answer or right or wrong. Thanks! :) b or d but im strongly going for D but i could be wrong
Wednesday, August 18, 2010 at 7:15am by ant

Math
a car travelled 60 km in 25 mins. its speed is equilent to _____km/hour. In 2 1/3 hours this car travelled______km if it maintained at this speed. when you change mins to hour to you divide 60 into 25 to get the km/hour??? im confused. 60km/25 min. = 12km/5min 5 min. is 1/12 ...
Friday, April 13, 2007 at 5:30pm by Anonymous

Physics
A soccer ball iskicked with an intial horizontal speed of 6 m/s and initial vertical speed of 3.5 m/s. Assume that the projection and landing height are the same, and neglect air resistance. Calculate the following a) the ball's projection speed and angle b)the ball's ...
Thursday, November 7, 2013 at 9:46pm by Crystal

algebra1
the speed of train A is 8mph slower than the speed of train B. Train A travels 220 in the same time it takes train B to travel 260 miles. Find the speed for each train.
Sunday, October 18, 2009 at 11:19pm by mark

Physics
I know how to get the speed if it accelerated the whole time. How do I calculate the cruising speed? Starting from rest, a car travels 1,350 meters in 1 min. It accelerated at 1 m/s^2 until it reached its cruising speed. Then it drove the remaining distance at constant ...
Friday, September 7, 2007 at 12:29am by Colin

physics
Two motorcycles are traveling in opposite directions at the same speed when one of the cyclists blasts his horn, which has frequency of 544 Hz. The other cyclist hears the frequency as 522 Hz. If the speed of sound in air is 344 m/s, what is the speed of the motorcycles
Tuesday, December 13, 2011 at 3:09am by Anonymous

physics
The cable of a 1800-kg elevator has broken, and the elevator is moving downward at a steady speed of 1.6 m/s. A safety braking system that works on friction prevents the downward speed from increasing. a. speed of boat when leaves ramp (assume that engine turned off once boat ...
Tuesday, May 1, 2012 at 8:20pm by lost

algebra II
An aircraft flew 6 hours with the wind. The return trip took 7 hours against the wind. If the speed of the plane in still air is 276 miles per hour more than the speed of the wind, find the wind speed and the speed of the plane in still air. The wind soeed was ______ mph.
Thursday, October 21, 2010 at 11:28pm by Anonymous

repost math question
An aircraft flew 6 hours with the wind. The return trip took 7 hours against the wind. If the speed of the plane in still air is 276 miles per hour more than the speed of the wind, find the wind speed and the speed of the plane in still air. The wind soeed was ______ mph.
Friday, October 22, 2010 at 11:46am by Anonymous

math
by how many order of magnitute is the speed of light greater than the average speed of grey sound? Rose Diamond when he set the hight gate track 710 m record of for this 47.43 sec in April 2003 710m/47.43s = close to 15 m/s. The speed of light is 3 x 10^8 m/s or 30 x 10^7 m/s...
Monday, October 16, 2006 at 9:56pm by math

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

science
The true speed of a moving car on the Earth, if you want to be very precise, would be the speed of the car with respect to the ground Is this true? yeah it is true yeah it is true The true speed of a moving car on the Earth, if you want to be very precise, would be the speed ...
Thursday, May 10, 2007 at 11:27am by Haley

Trigonometry
A race car is driven around a circular track at a constant speed of 180mph. If the diameter is 1/2 mile, what is the angular speed of the car? Express your answer in revolutions per hour. The formula for angular speed is w=theta (in radians)/time
Monday, April 12, 2010 at 3:01pm by Anonymous

Trigonometry
A race car is driven around a circular track at a constant speed of 180mph. If the diameter is 1/2 mile, what is the angular speed of the car? Express your answer in revolutions per hour. The formula for angular speed is w=theta (in radians)/time
Monday, April 12, 2010 at 4:50pm by Anonymous

Geometry
The piolet of a single-engine airplane flies at a constant speed of 200 km/h at a bearing of N 25 degree E. There is a 40 km/h crosswind blowing southeast (S 45 degress E). What are the plane's actual speed and direction? Round the speed to the nearest tenth and the directiuon...
Monday, November 28, 2011 at 1:14pm by Jay

physics
an airplane has a speed of 600km/h with respect to air. it has to fly a distance of 800km northward. in what direction should it fly if a steady wind is blowing at a speed of 120km/h from the west ? what will its speed with respect to the ground be? draw the relevant diagram ...
Saturday, February 11, 2012 at 9:11am by ash

MAth grade 8
mr kumar lives in the eastern part of spore . he visits his aged parents , who lives 36 km away , every weekend he finds that is he increases the average speed of his vehicle by 12km/h, he could save 9 minutes of his travelling time. find the speed at which he travels before ...
Thursday, November 10, 2011 at 8:25am by Aldwin

physics
Approaching a flashing pedestrian activated traffic light, a driver must slow down to a speed of 30km/h. If the cross walk is 150m away and the vehicle's initial speed us 59km/h, what must be the magnitude of the car's acceleration to reach the speed limit? Answer is 0.41m/s^2...
Wednesday, July 3, 2013 at 7:32pm by jason

Math
A sample of 500 drivers was asked whether or not they speed while driving. The following tables gives a two-way classification: Speed Never speed Male 222 78 Female 128 72 We wish to test whether gender and speeding are related at the 1% significance level.
Saturday, December 14, 2013 at 11:33pm by Melina

Math
A sample of 500 drivers was asked whether or not they speed while driving. The following tables gives a two-way classification: Speed Never speed Male 222 78 Female 128 72 We wish to test whether gender and speeding are related at the 1% significance level.
Saturday, December 14, 2013 at 11:33pm by Melina

physics
Olympic champion Justin gaitlin set a new world record for 100.0 m sprint at the last lympics by clocking 9.86 s for the race.Calculate a)His average speed for the race b)Assuming that he accelerated uniformly for the first 4.86 s after taking off the blocks to reach a maximum...
Monday, September 24, 2007 at 7:05pm by JohnX

physics
Olympic champion Justin gaitlin set a new world record for 100.0 m sprint at the last lympics by clocking 9.86 s for the race.Calculate a)His average speed for the race b)Assuming that he accelerated uniformly for the first 4.86 s after taking off the blocks to reach a maximum...
Monday, September 24, 2007 at 8:05pm by Sam

physics
A 30g bullet with a speed of 400m=s strikes a glancing blow to a target brick of mass 1:0kg. The Brick breaks into two fragments. The bullet deflects at a angle of 30 above the +x-axis and has a reduced speed of 100m=s. One piece of the brick with mass (0.75kg) goes off to ...
Monday, September 27, 2010 at 11:23pm by kimber

physics
A 30g bullet with a speed of 400m=s strikes a glancing blow to a target brick of mass 1:0kg. The Brick breaks into two fragments. The bullet deflects at a angle of 30 above the +x-axis and has a reduced speed of 100m=s. One piece of the brick with mass (0.75kg) goes off to ...
Monday, September 27, 2010 at 11:30pm by kimber

physics
a car crosses the street ABC. the segment AB = average speed of 60km / h for 2 hours, the length BC = average speed of 90km / h for 1 h. the average speed of car travel in AC is? the route is a straight line
Sunday, October 10, 2010 at 12:06am by liz

Physics 4a
A stone is thrown vertically upward. On its way up it passes point A with speed v, and point B, 7.85 m higher than A, with speed v. Calculate (a) the speed v and (b) the maximum height reached by the stone above point B.
Friday, September 10, 2010 at 10:43am by Antonio

physics
A stone is thrown vertically upward. On its way up it passes point A with speed v, and point B, 7.85 m higher than A, with speed v/2. Calculate (a) the speed v and (b) the maximum height reached by the stone above point B.
Friday, September 10, 2010 at 11:15am by Antonio

Geometry/trig
A plane is flying due south at a speed of 300 mph. The wind is blowing from the west at a speed of 40 mph. Find the resultant speed of the plane and the direction of the plane
Monday, February 6, 2012 at 4:40pm by Lezah

unified science
1) a bus drove 65 km/h. how far did it travel in 3 hours? 2) a bird fly at 8 m/s. how far can it travel in 10 seconds? 3) a snail can creep along at 5 cm/min. how can it travel in an hour? 4)an narrow flying at 94 m/s struck the target in 1.8 s. how far away was the target? 5...
Sunday, November 25, 2012 at 5:23pm by witazza

physics
A certain spaceship has a speed of 18200 mi/hr. What is its speed in light-years/century? A light-year is the distance that light travels in one year with a speed of 186,000 mi/s.
Tuesday, June 14, 2011 at 10:38pm by lisa

Physics
Water flowing through a 2.8 cm-diameter pipe can fill a 200 L bathtub in 5.8 min. Flow rate Q = volume/time = speed * cross section area Q=200/5.8=speed*.028....i get 1231.52 or Q=(200/348)=speed*.028...i get 20.52 both are wrong so what do i do? then i did speed=200/(pi*.25^2...
Tuesday, November 17, 2009 at 4:49pm by ana

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

Pages: <<Prev | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Search
Members