Sunday

April 20, 2014

April 20, 2014

Number of results: 256,352

**Math**

An airplane is heading due south at a speed of 590km/h. If a wind begins blowing from the southwest at a speed of 65.0km/h (average). Calculate magnitude of the plane's velocity, relative to the ground. Calculate direction of the plane's velocity, relative to the ground. ...
*Saturday, September 12, 2009 at 1:15pm by Anne*

**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 tennis player moves back and forth along the baseline while waiting for her opponent to serve, producing the position-versus-time graph shown in the figure. (The vertical axis is marked in increments of 1 m and the horizontal axis is marked in increments of 4 s.) (a) Without...
*Wednesday, October 3, 2012 at 2:09pm by Anonymous*

**physics**

1. A student is dragging a 5 kg box along the floor. He pulls on the rope with a 25 Newton force. The rope is 37 degrees above horizontal. As the box slides 10 meters, it goes from a speed of 3 m/s to a speed of 7 m/s. a.) calculate the normal force on the box b.) calculate ...
*Wednesday, January 12, 2011 at 9:03pm by Energy*

**math**

The train slows down uniformly from a speed of 50m/s to a speed of 10m/s in a time of 20sec,During the next 30sec,it accelerates uniformly to a speed of u metres/sec.calculate the retardation from t=0 to t=20?
*Friday, May 3, 2013 at 10:21am by Meggy lep*

**math**

A motorist travelling at a steady speed of 120km/h covers a section of the highway in 30min. After a speed limit is imposed he finds that when travelling at the maximum speed allowed he takes 20 min. longer than before to cover the same section. Calculate the speed limit.
*Friday, November 30, 2012 at 12:54am by Lindsay*

**Physics **

You are driving south on a highway at 24.0 m/s (approximately 54 mi/h) in a snowstorm. When you last stopped, you noticed that the snow was coming down vertically, but it is passing the windows of the moving car at an angle of 26.6° to the horizontal. Calculate the speed of ...
*Sunday, February 5, 2012 at 11:07pm by Jeremy *

**math**

The distance from TDC (top dead centre) for the pin is given by x when the crank is at angle . Hence : i) Give an equation for x in terms of the other variables (r, L and ). ii) If the crank rod is rotating at a constant value of ω calculate the speed of ...
*Tuesday, May 17, 2011 at 3:16pm by Karl Haxell*

**Physics**

A sky diver of mass 80.0 ks jumps from a slow-moving aircraft and reaches a terminal speed of 50.0 m/s. a) What is the acceleration of the sky diver when her speed is 30.0 m/s? What is the drag force on the diver when her speed is b) 50.0 m/s? c) 30.0 m/s? If you assume drag ...
*Thursday, March 1, 2007 at 5:36am by Jean*

**Physics**

The speed time graph shows the motion of a car over a period of 40 seconds. a. describe the motion of the car between: 1.) O and A - The car is traveling at constant speed from 0 to 20 m/s. 2.) A and B - The car is at rest for 20 seconds. 3.) B and C - The car is decelerating ...
*Tuesday, February 5, 2013 at 7:45am by RR*

**Physics**

The speed time graph shows the motion of a car over a period of 40 seconds. a. describe the motion of the car between: 1.) O and A - The car is traveling at constant speed from 0 to 20 m/s. 2.) A and B - The car is at rest for 20 seconds. 3.) B and C - The car is decelerating ...
*Tuesday, February 5, 2013 at 8:21am by RR*

**followup question**

-- For this question, I know how to find the initial speed. If it asks, "What is the speed of the car just before it lands safely on the other side?" how do i calculate that because it's not the same as final velocity right? --------------------------------- you got u, the ...
*Friday, February 4, 2011 at 4:09pm by Damon*

**science**

You can calculate frequency from Frequency = (wave speed)/(wavelength) You have provded a time, not a wave speed. What does that time mean? If it is the time for a wave to travel a known distance D, calculate that wave speed using V = D/T and use it in the formula above.
*Sunday, March 9, 2008 at 10:53pm by drwls*

**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*

**math**

A car takes 3 hours to travel 3km at a constant speed on an open road. Calculate the speed of the car
*Sunday, September 11, 2011 at 1:46pm by Anonymous*

**phys**

An airplane is heading due south at a speed of 590 km/h. If a wind begins blowing from the southwest at a speed of 65.0 km/h (average). Calculate magnitude of the plane's velocity, relative to the ground. Calculate direction of the plane's velocity, relative to the ground. ...
*Tuesday, September 15, 2009 at 4:18am by physics*

**physics**

A disk rotates about its central axis starting from rest and accelerates with constant angular acceleration. At one time it is rotating at 7 rev/s. 55 revolutions later, its angular speed is 21 rev/s. (a) Calculate the angular acceleration. (b) Calculate the time required to ...
*Sunday, March 11, 2007 at 10:46pm by winterWX*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*Thursday, June 20, 2013 at 3:05am by Anonymous*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*Thursday, June 20, 2013 at 3:05am by Anonymous*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*Thursday, June 20, 2013 at 3:05am by Anonymous*

**physics**

A train travel some distance with a speed of 30km/hr and return with a speed of 45km/hr. Calculate average speed.
*Thursday, June 20, 2013 at 3:05am by Anonymous*

**Science - Waves - Sci. Notation**

I know that the formula to calculate the speed of light is c=fλ. F is the frequency, c is the speed, and λ is the wavelength. So how do I calculate the wavelength of a purple light with a frequency of 750 * 10^12 HZ. Frequency is measured in HZ. The speed is measured...
*Thursday, January 31, 2013 at 7:12pm by Jamia*

**physics**

A car moving with an initial speed v collides with a second stationary car that is 50.7 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 33.2 percent of the original speed. Calculate the final speed of the second ...
*Wednesday, March 26, 2014 at 7:48pm by Erin*

**physics**

if co-efficient of friction between tyre and road is 0.5, what is smallest radious at which car turn on a horizontal road when its speed is 30 km/hr? 2.Q calculate angular speed of how hand of a clock? 3.Q A what angle must cut rack with a bend of 250m banked for safe running ...
*Monday, September 27, 2010 at 12:25pm by vishal*

**physics**

A 5.40 Kg package slides 1.47 meters down a long ramp that is inclined at 11.6 degress below the horizontal. The coefficient of kinetic friction between the package and the ramp is = 0.313. Calculate the work done on the package by friction. Calculate the work done on the ...
*Monday, December 3, 2012 at 5:44pm by clariza gonzalez*

**physics**

A vehicle with a mass of 2 tons travels on a horizontal road at a speed of 126km/h.The driver notices a donkey at the side of the road and decides to reduce speed. The brakes are applied and the vehicle slows down to 72km/h after 5 seconds. Calculate the distance travelled ...
*Wednesday, March 6, 2013 at 1:17pm by leslie*

**Maths**

The distance from TDC (top dead centre) for the pin is given by x when the crank is at angle . Hence : i) Give an equation for x in terms of the other variables (r, L and ). ii) If the crank rod is rotating at a constant value of ω calculate the speed of ...
*Tuesday, May 17, 2011 at 7:18am by Karl Haxell*

**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
*Saturday, February 25, 2012 at 9:24pm by Devin*

**physics**

A car moving with an initial speed v collides with a second stationary car that is 46.0 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 37.7 percent of the original speed. Calculate the final speed of the second...
*Monday, March 24, 2014 at 9:45am by Sami*

**physics - PLEASE HELP**

A softball of mass 0.220 kg that is moving with a speed of 6.5 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. Afterward it is found that the incoming ball has bounced backward with a speed of 4.8 m/s. (a) Calculate the ...
*Thursday, December 10, 2009 at 6:04pm by Anonymous*

**physics**

In order to convert a tough split in bowling, it is necessary to strike the pin a glancing blow as shown in the figure. Assume that the bowling ball, initially traveling at 15.0 m/s, has four times the mass of a pin and that the pin goes off at 75° from the original direction ...
*Thursday, October 20, 2011 at 11:31pm by kago*

**Physics**

A little red wagon with mass 7.0kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of4.00 m/s and then is pushed 3.0m in the direction of the initial velocity by a force with a magnitude of 10.0 N a.) Use the work-energy theorem to ...
*Monday, October 15, 2012 at 1:34pm by Frankie*

**Physics**

A little red wagon with mass 7.0kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of4.00 m/s and then is pushed 3.0m in the direction of the initial velocity by a force with a magnitude of 10.0 N a.) Use the work-energy theorem to ...
*Monday, October 15, 2012 at 1:31pm by Frankie*

**physics**

i found the the speed for (a) of when it was launch.. i calculate it from the formula .. v(t)= V+g(t) V=15+9.8(2)=34.6 but how do i calculate it for (b) i tried plugging in 4.2 but i didnt work
*Monday, February 7, 2011 at 11:37am by shaknocka*

**physics**

Assuming that the speed of sound at a certain altitude is 330m/s calculate the speed of an airplane that is traveling at match 4.2 ?
*Wednesday, June 6, 2012 at 1:52pm by Melissa*

**Physics**

A softball of mass 0.200 kg that is moving with a speed of 8.2 m/s collides head-on and elastically with another ball initially at rest. Afterward the incoming softball bounces backward with a speed of 3.9 m/s. 1. Calculate the velocity of the target ball after the collision. ...
*Thursday, November 12, 2009 at 3:37pm by Anonymous*

**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*

**physics**

Assuming that the speed of sound at a certain altitude is 330m/s calculate the speed of an airplane that is travelling at (A) mach 0.70
*Monday, June 4, 2012 at 1:09pm by Melissa*

**physics**

A softball of mass 0.220 kg that is moving with a speed of 4.0 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. Afterward the incoming softball bounces backward with a speed of 1.8 m/s. a) Calculate the velocity of the ...
*Monday, May 30, 2011 at 12:30pm by Nick*

**physics**

A softball of mass 0.220 kg that is moving with a speed of 4.0 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. Afterward the incoming softball bounces backward with a speed of 1.8 m/s. a) Calculate the velocity of the ...
*Tuesday, May 31, 2011 at 7:50am by Nick*

**Algebra**

Distance = Speed/time = 40/(2/3) = ? ?D = Speed/(1/2) Calculate for distance, then speed.
*Wednesday, December 5, 2012 at 4:14am by PsyDAG*

**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**

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*

**physics**

The combined mass of a race car and its driver is 600. kilograms. Traveling at a constant speed, the car completes one lap around a circular track of radius 160 meters in 36 seconds. A) Based on the given information, calculate the speed of the car. B) Calculate the magnitude ...
*Sunday, January 10, 2010 at 1:38pm by Nicole*

**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*

**math-calculus**

a plane flew from red deer to winnipeg, flying distance of 1260 km. on the return journey, due to a strong head wind, the plane travelled 1200 km in the same time it took to complete the outward journey. on the outward journey, the plane be able to maintain an average speed ...
*Sunday, January 8, 2012 at 11:19pm by Shreya*

**Physics**

Calculate his speed going back to the spacecraft after throwing the wrench, using conservation of momentum. Then divide 35.5 m by that speed.
*Sunday, December 2, 2012 at 2:19am by drwls*

**physics**

A softball of mass 0.220 kg that is moving with a speed of 5.5 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. Afterward it is found that the incoming ball has bounced backward with a speed of 3.9 m/s. (a) Calculate the ...
*Sunday, January 10, 2010 at 5:00pm by Anonymous*

**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- HELP**

How to find average speed with a given initial speed, theta, and delta x? I know average speed= total distance/total time, but I am given an initial speed, an angle and delta x. Mark throws a ball to Daniel with an initial speed of 20 m/s at an angle of 45 degrees. If they are...
*Wednesday, December 1, 2010 at 7:26pm by Amm*

**math (calculate speed)**

m*g*h = 1/2*m*v^2 where m is the mass; g is the acceleration due to gravity; v is the speed. At the top of his dive, the swimmers energy is entirely potential energy = m*g*h; When he enters the pool, the potential energy is converted to kinetic energy: 1/2*m*v^2 v = = (2*g*h)^0.5
*Tuesday, January 8, 2013 at 5:13pm by Jennifer*

**Physics**

In order to convert a tough split in bowling, it is necessary to strike the pin a glancing blow as shown in Fig. 9-47. The bowling ball, initially traveling at 13.0 m/s, has four times the mass of a pin and the pin flies off at 80° from the original direction of the ball. ...
*Wednesday, March 5, 2014 at 3:54pm by Anonymous*

**math**

a motorist goes 78km in 40minutes calculate it speed
*Monday, July 4, 2011 at 3:23pm by Anonymous*

**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**

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*

**science waves**

You have to know the speed that the waves travel. For sound and light, this speed is well known. It is also easy to measure. Once you know the wave speed V, you can use the relationship (wavelength)x(frequency) = V With this, you can calculate the frequency from the wavelength...
*Sunday, May 18, 2008 at 10:24pm by drwls*

**physics**

a) First you calculate his speed of impact (the speed when he hits the ground). For this you can use the formula: v² = v0² + 2.a.x where: -v is your final speed -v0 is your initial speed (0 m/s in this case) -a is your acceleration (the gravitational acceleration in this case...
*Thursday, December 11, 2008 at 8:04pm by Christiaan*

**Physics**

Force F causes displacement d of a 20-Kg object starting from rest along a frictionless path. F= 10 N i + 50 N j + 15 N k and d= 10 m i + 60 m k A) Calculate the work done by the force. B) Calculate the angle between the vectors F and d. C) Calculate the final speed of the ...
*Wednesday, April 22, 2009 at 10:40pm by Sandhya*

**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*

**math**

how do you calculate the distance and speed of a motorcycle that is going to jump 4 cars
*Wednesday, August 24, 2011 at 8:11pm by linda*

**physics**

A space habitat for a long space voyage consists of two cabins each connected by a cable to a central hub as shown in the figure below. The cabins are set spinning around the hub axis, which is connected to the rest of the spacecraft to generate artificial gravity. (a) What ...
*Monday, November 8, 2010 at 3:24pm by Anonymous*

**physics**

Calculate the magnitude of the linear momentum for the following cases. (a) a proton with mass 1.67 10-27 kg, moving with a speed of 4.00 106 m/s (b) a 16.5 g bullet moving with a speed of 270 m/s (c) a 70.5 kg sprinter running with a speed of 12.5 m/s (d) the Earth (mass = 5....
*Monday, July 7, 2008 at 9:31am by Elisa*

**physics**

A train travel 20km at a uniform speed 60km/1hr and the next 20km at a uniform speed of 80km/1hr calculate its average speed
*Tuesday, April 1, 2014 at 8:53am by prabhjot*

**Chemistry Help**

The molecules of a certain gas sample at 367 K have a root-mean-square (rms) speed of 261 m/s. Calculate the most probable speed and the mass of a molecule.
*Wednesday, December 5, 2012 at 7:55pm by Anonymous*

**Maths**

the speed of light is 3 * 10^ 8m/s. Jupiter is 778 million km from the sun. Calculate the number of minutes it takes for sunlight to reach Jupiter ? A star is 300 lights away from Earth. If the speed of light is 3 * 10^5 km/s. calculate the disatance from the star to Earth. ...
*Monday, November 26, 2007 at 3:03pm by YOYO*

**applied math - more info**

which speed? rotation speed, orbital speed, speed of a falling body?
*Tuesday, March 13, 2012 at 3:55am by Anonymous*

**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**

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*

**physics**

Calculate upstream rate = d/t. Calculate downstream rate = d/t. subtract rates to obtain speed of the river.
*Thursday, October 4, 2007 at 12:10pm by DrBob222*

**Mathematics**

For the first 1 1/2 hours of a 91km journey the average speed was 30km/h.If the average speed for the reminder of the journey was 23km/h, calculate the average speed for the entire journey.
*Monday, July 20, 2009 at 9:17pm by Lydia*

**Physics**

A car of mass 1200kg starts from rest, accelerates uniformly to a speed of 4.0 meters per second in 2.0 seconds and continues moving at this constant speed in a horizontal straight line for an additional 10 seconds. the brakes are then applied and the car is brought to rest in...
*Tuesday, December 4, 2012 at 5:00am by Ken*

**physics**

The launching speed of a certain projectile is 3.0 times the speed it has at its maximum height. Calculate the elevation angle at launching
*Friday, February 8, 2013 at 8:43am by julia*

**Physics**

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Thursday, November 14, 2013 at 8:45pm by Vinny*

**Physics**

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Thursday, November 14, 2013 at 8:45pm by Vinny*

**Physics**

The launching speed of a certain projectile is 9.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Thursday, November 14, 2013 at 8:54pm by Vinny*

**physics-speed**

the mean volume folume flow of blood in the arterial system is X m^3 s^-1. the area of the aorata is Y m^2. calculate the speed of flow.
*Saturday, March 28, 2009 at 10:10pm by lisa*

**physics**

if the speed of light in air is3.0 by 10 to the 8 power per second calculate speed of light in a glass box
*Wednesday, October 20, 2010 at 5:25pm by stela*

**Maths**

A spaceship has a speed of 500000 meters per second. Calculate, in scientific notation, the speed in km per hour.
*Monday, March 26, 2012 at 8:58am by Cyco*

**Physics please help!!**

The launching speed of a certain projectile is 9.0 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Sunday, February 3, 2013 at 12:42pm by Julia *

**college math**

v = boat speed speed downstream = (v + 6) speed upstream = (v-6) time = distance/speed 160/(v+6) = 96/(v-6) 10/(v+6) = 6/(v-6) 5/(v+6) = 3/(v-6) 3(v+6) = 5(v-6) 3 v + 18 = 5 v - 30 2 v = 48 v = 24 mph
*Friday, March 9, 2012 at 4:57pm by Damon*

**Chemistry**

Using Heisenberg's Principle, calculate for the following positions. a) a 1.54-mg mosquito moving at a speed of 1.82 m/s if the speed is known to within ± 0.01 m/s b) a proton moving at a speed of (4.67 ± 0.02) 104 m/s When I solved (a) I got 1.88e-30 and (b) I got 3.41e-5 but...
*Wednesday, March 17, 2010 at 7:48pm by Anonymous*

**Physics**

A 245 g particle is released from rest at point A inside a smooth hemispherical bowl of radius 35.0 cm, as shown in Figure 5-21. (a) Calculate the gravitational potential energy at A relative to B. 1 . (b) Calculate the particle's kinetic energy at B. 2 (c) Calculate the ...
*Thursday, October 20, 2011 at 2:15pm by Brooks*

**physics**

(a) a person in a wheelchair approaches a 0.50-m-high ramp with a speed of 3.5 m/sec. calculate the final speed of the wheelchair at the top of the ramp if the person coasts up and friction is negligible. (b) what initial speed would be necessary to be 1.0 m.sec? i need this ...
*Friday, May 4, 2012 at 11:28pm by sara*

**physics**

a stone is dtropped from the top of 40m heigh calculate its speed after 2 seconds .Also find the speed ith the stone strikes the ground.
*Thursday, September 15, 2011 at 3:43am by Anonymous*

**Physics**

The rumble is a sound, and sound travels at a speed of 343 m/s in air. The answer that was given is more than twice the speed of sound. Since we already know the speed of sound, we can only calculate the time required to travel 10km. VT = 10,000 m 343T = 10,000
*Tuesday, May 22, 2012 at 12:50am by Henry*

**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*

**Physics**

A stone thrown horizontally from a height of 7.8 m hits the ground at a distance of 12.0 m. Calculate the speed of the ball as it hits the ground. I was able to find the initial speed of the ball, which is 9.52 m/s. However, I'm unsure about whether I need to use this number ...
*Saturday, November 3, 2007 at 4:24pm by Lindsay*

**Physics/Math**

A bicyclist travels in a circle of radius 35.0 m at a constant speed of 7.00 m/s. The bicycle-rider mass is 72.0 kg. Calculate the magnitude of the force of friction on the bicycle from the road. Calculate the magnitude of the net force on the bicycle from the road.
*Monday, February 12, 2007 at 3:40am by COFFEE*

**Physics**

The launching speed of a certain projectile is 6.4 times the speed it has at its maximum height. Calculate the elevation angle at launching. I have noo idea how to start this one. Please help!
*Wednesday, November 7, 2007 at 9:09pm by Lindsay*

**physics**

calculate the range of the projectile using the initial speed and angle. use 9.8m/s. Initial speed 18m/s and the is 75 degrees. I came up with 8.29 is that right
*Sunday, January 23, 2011 at 12:29pm by Anonymous*

**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*

**math**

Which formula can be used to calculate the Speed of sound which is about 540 miles per hour in minutes
*Sunday, October 16, 2011 at 6:07pm by John vick*

**Physics**

A small mass attached to a spring oscillates with simple harmonic motion with amplitude of 70mm,taking 13 seconds to make 40 complete oscillations.Calculate the following showing steps; a.Its angular ferquency b.Its maximum speed c.Its maximum acceleration d.Its speed when ...
*Thursday, April 5, 2012 at 3:33am by Nkamo*

**physics**

the speed of a cyclist reduces uniformly from 2.5 m/s to 1.0 m/s in 12 s. (a) calculate the deceleration of the cyclist. (b) calculate the distance travelled by the cyclist in this time
*Sunday, October 31, 2010 at 7:55pm by valerie*

**PHYSICS!!**

I've tried this problem again and again using conservation of momentum and energy but I am not having any luck: A ball of mass 0.300kg that is moving with a speed of 8.0m/s collides head-on and elastically with another ball initially at rest. Immediately after the collision, ...
*Friday, October 11, 2013 at 12:06am by Alison*

**Clocking Tectonic Plates**

Explain how you could calculate the average speed of the Pacific Plate over the past five million years, then calculate the value? I tried searching the internet for this, I came up with nothing, and I just dont get this question.
*Thursday, January 13, 2011 at 6:50pm by Anonymous*

**math**

A woman throws a cricket ball upwards into the air. The ball leaves the womans hand at 1.8m above the ground at speed of 9.7. It rises and then falls back to the ground. Considering the energies involved calculate the speed at the point it hits the ground. accerlation due to ...
*Wednesday, December 15, 2010 at 8:17am by joleen*

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