Saturday

April 19, 2014

April 19, 2014

Number of results: 80,789

**physics**

A rocket of mass 4.36 × 105 kg is in flight near earth's surface. Its thrust is directed at an angle of 58.9° above the horizontal and has a magnitude of 9.61 × 106 N. Find the (a) magnitude and (b) direction of the rocket's acceleration. Give the direction as an angle above ...
*Monday, June 24, 2013 at 12:09pm by sam*

**Physics**

A small rocket is fired in a test range. It rises high into the air and soon runs out of fuel. On the way down it passes near an observer (sitting in a 22.5-m-high tower) who sees the rocket traveling at a speed of 37.9 m/s and moving in a vertical plane at an angle of 50.8° ...
*Tuesday, January 28, 2014 at 12:00am by Anonymous*

**phyicis**

during burn: v = 8.2t v(5) = 41 m/s h = 1/2 (8.2) t^2 h(5) = 102.5 m So, after 5 seconds, the rocket is 102.5 meters up, with a speed of 41.0 m/s. Now, only gravity provides acceleration, so h = 102.5 + 41.0t - 4.9 t^2 h=0 when t = 10.382 max h when t = -41.0/-9.8 = 4.18 h(4....
*Monday, October 29, 2012 at 1:18pm by Steve*

**Physics newton**

A rocket weighs 1 x10^7 N while on the surface of the earth. The ignition of its engines results in a lift off force of 1.5 X 10^7 N a) what is the mass of the rocket. b) what is its acceleration at lift -off c)How fast will it be moving if it acceleartion at this rates for 10...
*Sunday, November 5, 2006 at 4:04pm by harry*

**Physics**

A stone is thrown straight up at 8.99 m/s. What is the stone's acceleration in m/s/s at the top of its rise?
*Thursday, October 4, 2012 at 8:28pm by Ted*

**physics**

A stone is thrown straight up at 5.94 m/s. What is the stone's acceleration in m/s/s at the top of its rise?
*Thursday, October 4, 2012 at 8:55pm by Conner*

**Engineering Physics**

A car and a train move together along straight, parallel paths with the same constant cruising speed v(initial). At t=0 the car driver notices a red light ahead and slows down with constant acceleration -a(initial). Just as the car comes to a full stop, the light immediately ...
*Wednesday, September 16, 2009 at 11:36am by Andrew Rozmarynowycz*

**Physics**

The angular acceleration rate is alpha = (Angular velocity at 2.19 s)/2.19s = (0.531/0.172)/2.19 = 1.41 rad/s^2 The tangential acceleration rate remains constant at R*alpha = 0.242 m/s^2 during the turntable acceleration. The 1.9 s time is not needed for the calculation, since...
*Wednesday, June 15, 2011 at 11:57pm by drwls*

**physics**

"A cab driver picks up a customer and delivers her 3.31 km away, driving a straight route. The driver accelerates to the speed limit and, upon reaching it, begins to decelerate immediately. The magnitude of the deceleration is 4.70 times the magnitude of the acceleration. Find...
*Friday, June 1, 2012 at 1:08am by Rachael*

**physics**

A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 81.0 m/s at ground level. Its engines then fire and it accelerates upward at 4.10 m/s2 until it reaches an altitude of 940 m. At that point its engines fail, and the rocket goes into ...
*Thursday, February 10, 2011 at 11:10pm by chuikia*

**8th grade science**

At constant velocity on a straight section, she experiences no net force. On the curves, she experiences centripetal acceleration. This requires an unbalanced force
*Thursday, November 11, 2010 at 7:04pm by drwls*

**Physics**

A projectile is fired straight up at a speed of 13 m/s. How long does it take to reach the top of its motion? The acceleration due to gravity is 9.8 m/s2 .
*Tuesday, September 11, 2012 at 7:07pm by Alex*

**physics**

A ball is thrown straight up with an initial speed of 30 m/s. How high does it go? Assume the acceleration of gravity is 10 m/s 2 . Answer in units of m
*Monday, October 1, 2012 at 8:58pm by James*

**Physics**

A ball thrown straight up at ground level passes a height of 115.7 m in 5.6 s. The acceleration of gravity is 9.8 m/s^2. What was its initial speed? Answer in units of m/s.
*Sunday, February 9, 2014 at 4:41pm by Fabricus*

**physics**

A rocket is fired vertically up from the ground with a resultant vertical acceleration of (a) what is the maximum height reached? (b) After how much time from then will the maximum height be reached?(take g=10m/s2
*Monday, September 6, 2010 at 11:14am by sachin*

**Physics**

An arrow is launched vertically upward from a crossbow at 98.2 m/s. Ignoring air friction, what is its instantaneous speed at the end of 10.0 s of flight? What is its average speed up to that moment? How high has it risen? What is its instantaneous acceleration 4.20 s into the...
*Wednesday, October 6, 2010 at 8:32pm by jake*

** physics**

A projectile with mass of 139 kg is launched straight up from the Earth's surface with an initial speed vi. What magnitude of vi enables the projectile to just reach a maximum height of 5.8RE, measured from the center of the Earth? Ignore air friction as the projectile goes ...
*Monday, February 28, 2011 at 9:05am by Ugandanmafia*

**Physics**

A 12000 kg airplane launched by a catapult from an aircraft carrier is accelerated from 0 to 200 km/h in 3 s. (a) How many times the acceleration due to gravity is the airplane's acceleration? (b) What is the average force the catapult exerts on the airplane?
*Wednesday, January 16, 2013 at 11:58am by Jan*

**physics**

A 12 000-kg airplane launched by a catapult from an aircraft carrier is accelerated from 0 to 200 km/h in 3 s. (a) How many times the acceleration of gravity is the airplane’s acceleration? (b) What is the average force that the catapult exerts on the airplane?
*Monday, November 18, 2013 at 7:29pm by josna *

**physics**

three more questions: 1) A 1.50kg projectile is launched at 18.0m/s from level ground. The launch angle is 26 degrees above the horizontal. (Assume negligible friction) a) What is the maximum height reached by this projectile? b) How was will the projectile be travelling when ...
*Thursday, February 17, 2011 at 8:34pm by stacy*

**Physics**

Light travels in a straight line at a constant speed of 300,000 meter per second. What is the acceleration of light? If it has a constant speed then it's not accelerating, is it? BTW I think it's 3x10^8m/sec or 300,000,000 m/sec. It would be 300,000km/sec.
*Wednesday, September 13, 2006 at 11:19pm by Jennifer*

**physics**

A projectile is launched straight upwards at 45 m/s. Three seconds later, its velocity is A. 75 m/s B. 30 m/s C. 15 m/s D. zero
*Sunday, November 28, 2010 at 7:44pm by Tracey*

**physics**

The cheetah can reach a top speed of 114km/h (71mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 50m in a straight line reaching a final speed of 91 km/h. a.) Determine the cheetah's average acceleration during the short sprint. b.) Find it'...
*Sunday, February 3, 2013 at 6:11pm by george*

**physics**

Pam has a mass of 33.0 kg and she is at rest on smooth, level, frictionless ice. Pam straps on a rocket pack. The rocket supplies a constant force for 15.0 m and Pam acquires a speed of 60.0 m/s. (a) What is the magnitude of the force? 1 N (b) What is Pam's final kinetic ...
*Thursday, May 10, 2012 at 11:34am by dan*

**physics**

a drunken motorist who is moving at a constant velocity of 90 km/h passes a stationary police patrol car. The patrol car immediately gives chase at a constant acceleration and catches up with the motorist after a distance of 10 km. Calculate the time taken by the patrol car to...
*Friday, November 2, 2012 at 7:53am by sarah*

**phyics**

If two cars are traveling along a straight road, one behind the other. the first is traveling at a constant velocity of 10 m/s. the second, approaching from the rear, is traveling at 22 m/s. when the second car is 300m behind the first, the driver applies the brakes, ...
*Saturday, November 6, 2010 at 7:38pm by billy*

**Math for Educators**

Set it on the table so that it is a circle looking down at it. Cut straight down, all the way, along a diameter. Turn 90 degrees and cut straight down along a diameter perpendicular to the first cut. Now make a horizontal cut through all four pieces halfway up the cylinder.
*Thursday, December 24, 2009 at 10:45pm by Damon*

**Grade 11 physics **

Assuming the rocket was launched vertically without the effect of cross wind, then it is falling 1.5m for every 4m moved laterally. How many m. would it move laterally over 300m height? Hint: use proportions.
*Tuesday, October 19, 2010 at 10:56am by MathMate*

**physics**

A test rocket is fired vertically upward from a well. A catapult gives it an initial speed of 80.2 m/s at ground level. Its engines then fire and it accelerates upward at 4.20 m/s2 until it reaches an altitude of 960 m. At that point its engines fail, and the rocket goes into ...
*Saturday, October 10, 2009 at 8:13pm by Jamie*

**physics**

A wheel of 40cm radius rotates on a stationary axle. It isuniformly speeded up from rest to a speed of 900 rpm in a time of20s. Find (a) the constant angular acceleration of the wheel and(b) the tangential acceleration of a point of a point on itsrim.
*Thursday, February 9, 2012 at 11:50pm by Anonymous*

**physics**

A wheel of 40cm radius rotates on a stationary axle. It isuniformly speeded up from rest to a speed of 900 rpm in a time of20s. Find (a) the constant angular acceleration of the wheel and(b) the tangential acceleration of a point of a point on itsrim.
*Thursday, February 9, 2012 at 11:51pm by Anonymous*

**Physics**

Consider a coin which is tossed straight up into the air. After it is released it moves upward, reaches its highest point and falls back down again. Air resistance can be neglected. What force acts upon the coin when it is at its highest point? a. Force acting up and ...
*Sunday, June 30, 2013 at 5:10pm by Laura*

**Calculus**

A television camera is positioned 2500 ft from the base of a rocket launching pad. The angle of elevation of the camera has to change at the correct rate in order to keep the rocket in sight. Also the mechanism for focusing the camera has to take into account the increasing ...
*Friday, June 28, 2013 at 10:14pm by Robin*

**Calculus**

A television camera is positioned 2500 ft from the base of a rocket launching pad. The angle of elevation of the camera has to change at the correct rate in order to keep the rocket in sight. Also the mechanism for focusing the camera has to take into account the increasing ...
*Monday, July 1, 2013 at 7:11pm by Robin*

**physics**

according to recent typical test data, a Ford Focus travels 0.23 mi in 19 seconds, starting from rest. The same car, when braking from 59.0mph on dry pavement, stops in 141 ft. Assume constant acceleration in each part of its motion, but not necessarily the same acceleration ...
*Monday, January 27, 2014 at 9:50pm by Anonymous*

**Physics**

A projectile is fired straight up at a speed of 16 m/s. How long does it take to reach the top of its motion? The acceleration of gravity is 9.8 m/s2 . Answer in units of s.
*Monday, January 10, 2011 at 2:54pm by Michael*

**Physics **

A bullet is fired straight up from a gun with a muzzle velocity of 148 m/s. Neglecting air resistance, what will be its displacement after 6.3 s? The acceleration of gravity is 9.8 m/s2 .
*Sunday, October 7, 2012 at 9:41pm by Sophie *

**physics**

Two spheres are launched horizontally from a 0.8 m high table. Sphere A is launched with an initial speed of 16 m/s. Sphere B is launched with an initial speed of 8 m/s.
*Thursday, February 20, 2014 at 11:26pm by Anonymous*

**11th Grade Physics**

A rocket is fired vertically from the ground with a resultant vertical acceleration of 10ms^-2. The fuel is finished in 1 minute and it continues to move up. What is the maximum height reached? Solve it!!! N Please solve it as i've to copy it in my correction notebook it's my ...
*Thursday, July 22, 2010 at 2:17pm by Akashdeep Singh*

**physics**

Imagine you are sitting in a car tossing a ball straight up into the air. a) If the car is moving at constant velocity will the ball land in front of, behind, or in your hand? b) If the car rounds a curve at constant sped where will the ball land?
*Thursday, March 1, 2012 at 3:04pm by annoymus*

**physics**

An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of 13.5 m/s and measures a time of 21.8 s before the rock returns to his hand. What is the acceleration due to gravity on this planet? (...
*Sunday, January 15, 2012 at 4:58pm by Jen*

**physics**

An astronaut on a distant planet wants to determine its acceleration due to gravity. The astronaut throws a rock straight up with a velocity of + 15.5 m/s and measures a time of 13.9 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due...
*Monday, June 17, 2013 at 12:22pm by louis aaaa*

**physics**

The Kentucky Derby is held at the Churchill Downs track in Louisville, Kentucky. The track is one and one-quarter miles in length. One of the most famous horses to win this event was Secretariat. In 1973 he set a Derby record that would be hard to beat. His average ...
*Friday, January 15, 2010 at 6:21pm by Anonymous*

**Physics**

Sorry, the question is: What was the rocket's acceleration?
*Sunday, February 28, 2010 at 6:41pm by Dacia*

**physics**

A 15.0-kg test rocket is fired vertically from Cape Canaveral. Its fuel gives it a kinetic energy of 1961 J by the time the rocket motor burns all the fuel. What additional height will the rocket rise? m - how do you organize this? how do the J's fit in?
*Thursday, May 10, 2012 at 8:43pm by Haley *

**physics**

I'm a hurry to go to work today because I forgot to set my alarm clock and woke up late. I'm driving my car very fast, with a velocity of v=40 m/s and coming up to an intersection with a stoplight. When the distance between my car and the intersection is L=100 m, the light ...
*Tuesday, March 12, 2013 at 6:43pm by Anonymous*

**physics**

A 9.3 kg firework is launched straight up and at its maximum height 45 m it explodes into three parts. Part A (0.5 kg) moves straight down and lands 0.29 seconds after the explosion. Part B (1 kg) moves horizontally to the right and lands 10 meters from Part A. Part C moves to...
*Monday, December 22, 2008 at 1:33pm by seth*

**Physics**

Ball A is thrown straight down off the top of a tall building with an initial velocity of 20m/s. Ball b is thrown straight up from the top of the same building with initial velocity of 20 m/s. Which ball, if either, experiences the greater acceleration after leaving the ...
*Friday, February 7, 2014 at 3:21pm by Chris*

**physics**

A 3Kg projectile is fired straight upward from earth's surface with a speed that is one-fourth the escape speed. Neglecting air resistance. a) What is the Kinetic energy of this projectile when it is launched? b) what is the gravitational potential energy of this projectile ...
*Monday, February 14, 2011 at 7:47pm by rick*

**physics**

A cat drops from a shelf 3.9 above the floor and lands on all four feet. His legs bring him to a stop in a distance of 12 .Calculate his acceleration (assumed constant) while he is stopping, in .
*Wednesday, October 3, 2012 at 11:18pm by Anonymous*

**Mechanics M1**

A rabbit runs in a horizontal straight line ABC across a field (a)the rabbit runs from rest at A with a constant acceleration of 0.8 m/s^2 and reaches B after 3 seconds, find its speed at B
*Wednesday, March 7, 2012 at 7:42am by ahmad*

**physics**

hey i attempted this question but i dont know if its right. can some one check for me and correct it? If an antelope accelerates from rest in a straight line with a constant acceleration of 1.71 m/s2 how long in seconds does it take the antelope to reach a speed of 26.1 m/s ? ...
*Monday, September 21, 2009 at 10:09am by ron*

**Physics**

Liz rushes down onto a subway platform to find her train already departing. She stops and watches the cars go by. Each car is 8.60 m long. The first moves past her in 1.75 s and the second in 1.17 s. Find the constant acceleration of the train. I know how to find average ...
*Saturday, October 10, 2009 at 11:46pm by Erin*

**physics**

Draw free body diagrams and wqrite equations of motion for each block, including internal forces acting on the blocks that contact each other. remeber that action equals reaction. You will end up with four equations in four unknowns: three internal forces plus the acceleration...
*Wednesday, October 7, 2009 at 12:09pm by drwls*

**Cosmology**

In a universe where the scale factor is proportional to t^α, where t is time and α is a constant less than one, the universe has: * the sign of the acceleration is undetermined * negative acceleration * positive acceleration * zero acceleration
*Wednesday, January 16, 2013 at 12:24am by qwerty*

**physics**

I can only do this if it is assumed that the plane continues at 500 m/s in a vertical circle. Then it depends on how much centripetal acceleration the plane can achieve and the pilot stand. At the bottom of the circle the total force up on the wings and other surfaces must ...
*Monday, January 5, 2009 at 1:48am by Damon*

**Physics**

A jet plane is cruising at 225.0m/s when suddenly the pilot turns the engines up to full throttle. After travelling 2.26km, the jet is moving with a speed of 392.0m/s. What is the jet's acceleration, assuming it to be a constant acceleration?
*Saturday, September 29, 2012 at 12:39pm by Sarah*

**Physics**

1. Carlos jogs in a straight line at a constant speed of 1.5 m/s. He passes by Victoria, who, 10 seconds after Carlos had passed her, starts accelerating at a constant rate of 0.50 m/s^2 a) How much time after the passing of Carlos does it take Victoria to catch up to him? b) ...
*Monday, October 17, 2011 at 2:57pm by Raf*

**Physicss**

1. Carlos jogs in a straight line at a constant speed of 1.5 m/s. He passes by Victoria, who, 10 seconds after Carlos had passed her, starts accelerating at a constant rate of 0.50 m/s^2 a) How much time after the passing of Carlos does it take Victoria to catch up to him? b) ...
*Tuesday, October 18, 2011 at 2:51pm by Raf*

**PHYSICS**

An airplane is flying straight and level at a speed vo = 150 mph and with a constant time rate of increase of speed v' = 20 ft/s^2, when it starts to climb along a circular path with a radius of curvature p = 2000 ft. The airplane maintains v' constant for about 30s. Determine...
*Tuesday, July 9, 2013 at 11:12pm by ROCKY*

**Physics**

The barrel of a rifle has a length of 0.916m. A bullet leaves the muzzle of a rifle with a speed of 621m/s. What is the acceleration of the bullet while in the barrel? A bullet in a rifle barrel does not have a constant acceleration, but constant acceleration is to be assumed ...
*Friday, September 14, 2012 at 10:59pm by sam*

**physics**

The constant force provides the uniform acceleration. Since this acceleration is normal to the velocity, it is centripetal acceleration. The block will move along the curvilinear trajectory (circle).
*Monday, May 21, 2012 at 3:33pm by Elena*

**Physics**

Which of the following describe possible scenarios? A) An object has zero instantaneous velocity and non-zero acceleration. B) An object has negative acceleration and is speeding up. C) An object has positive acceleration and constant velocity. D) An object has positive ...
*Friday, September 6, 2013 at 12:10am by Branden*

**Scientific studies**

A toy air rocket is launched vertically with an initial velocity of 22m/s. (a) How long does it take to reach its maximum height (v=0m/s? (b) How long does it take to return to the ground (x-0m)?
*Wednesday, February 17, 2010 at 5:05pm by Aly*

**physics please help!**

A car driving along a straight road increases its velocity from 2.8 m/s to 9.7 m/s in 3 seconds. Calculate its acceleration in m/s^2 A skier in the Giant Slalom will accelerate at a constant 5.0 m/s^2 If she starts from rest, how fast is she going after 5 seconds? A skier at ...
*Wednesday, September 10, 2008 at 12:08am by Gray*

**physics**

The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period?
*Thursday, February 3, 2011 at 7:51pm by help*

**physics**

A car is up on a hydraulic at a garage. The wheels are free to rotate, and the drive wheels are rotating with a constant angular velocity. Does a point on the rim of the wheel have (A) a tangential velocity, (B) a tangential acceleration and (C) a centripetal acceleration?
*Tuesday, March 6, 2012 at 11:32pm by Amy*

**Physics**

How would I approach this problem? What formula would I use to answer each part? Thank you in advance for any guidance... As part of the launch of the space shuttle, solid-rocket boosters (SRBs) first take it to an altitude of 45.0 km while they accelerate it to a speed of ...
*Sunday, September 19, 2010 at 10:34am by .*

**Physics**

The cheetah can reach a top speed of 114 km/h (71 mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 46 m in a straight line, reaching a final speed of 83 km/h. (a) Determine the cheetah's average acceleration during the short sprint. (b) Find...
*Friday, September 14, 2012 at 12:41am by Claire*

**Physics**

An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at 15.0 m/s 2 . At t1 the rocket engine is shut down and the sled moves with constant velocity v for another t2 s. The total distance traveled by the sled is 5.60 × 10 3 m and the ...
*Thursday, October 6, 2011 at 10:04pm by Josh *

**PSY 102**

all we know is that the moon would travel in a straight line. No forces means no acceleration, so constant velocity. What that path would be depends on where in its orbit the moon happens to be when gravity stops.
*Wednesday, September 25, 2013 at 5:37pm by Steve*

**Physics/Math**

Ok...I figured out part a but I am having trouble with b. part a was: Zero, a hypothetical planet, has a mass of 1.0x10^23 kg, a radius of 3.0x10^6 m, and no atmosphere. A 10 kg space probe is to be launched vertically from its surface. (a) If the probe is launched with an ...
*Monday, March 12, 2007 at 12:17am by Technoboi11*

**Please help with Calc problem??**

Sorry, I meant a television camera is positioned 2500 ft from the base of a rocket launching pad. The angle of elevation of the camera has to change at the correct rate in order to keep the rocket in sight. Also the mechanism for focusing the camera has to take into account ...
*Wednesday, July 3, 2013 at 10:38am by Robin*

**science**

The engines of a 1.20 x 10^5 N rocket exert an upward thrust of 2.00 x 10^5 N for 1.50 minutes upon lift off. What is the impulse exerted on the rocket? What is the velocity of the rocket at the end of the 1.50 minute period?
*Thursday, February 3, 2011 at 5:24pm by Maria*

**science one question**

2.Which of the following would be affected if a soaring eagle changed direction but remained at a constant speed? acceleration only velocity only*** acceleration and velocity neither i dont think it would be acceleration since the eagle stayed at a constant speed... help asap??
*Thursday, March 13, 2014 at 12:29pm by TTR+S<3 *

**physics**

(ignore the other question i posted this is the right one) A rocket has a pre-ignition mass of 1100kg. On ignition it burns fuel at rate of 20kg s-1 producing a thrust of 10000N. How long after ignition of the fuel, will the rocket lift off? also explain how is it possible for...
*Wednesday, February 15, 2012 at 5:04pm by beavis*

**physics**

A bullet is fired straight up from a gun with a muzzle velocity of 170 m/s. Neglecting air resistance, what will be its displacement after 5.8 s? The acceleration of gravity is 9.8 m/s2 . Answer in units of m.
*Tuesday, March 22, 2011 at 10:15pm by maria*

**physics**

A bullet is fired straight up from a gun with a muzzle velocity of 170 m/s. Neglecting air resistance, what will be its displacement after 5.8 s? The acceleration of gravity is 9.8 m/s2 . Answer in units of m.
*Tuesday, March 22, 2011 at 10:45pm by maria*

**physics**

A bullet is ﬁred straight up from a gun with a muzzle velocity of 253 m/s. Neglecting air resistance, what will be its displacement after 2.9 s? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m
*Monday, October 22, 2012 at 8:04pm by Anonymous*

**physics**

A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 67.6° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 29.5 m away. By how much does the rocket clear the top of the wall?
*Friday, September 17, 2010 at 12:11am by san*

**Physics**

A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 63.0° above the horizontal. The rocket is fired toward an 11.0 m high wall, which is located 22.0 m away. By how much does the rocket clear the top of the wall?
*Wednesday, October 13, 2010 at 4:53pm by Allison*

**Physics**

Is it possible for an object to have an acceleration when the speed of the object is constant? yes no not enough information to decide Give your reasoning. acceleration is a vector. So speed could be constant, but the direction changing.
*Tuesday, March 20, 2007 at 4:22pm by Mary*

**PHYSICS~Acceleration**

Yes to your answer: "There would be upward acceleration at first and then there would be downward acceleration at the end". During the middle of the trip, velocity would be constant. It takes about one floor to reach a constant velocity, or decelerate; this varies with the ...
*Monday, November 22, 2010 at 7:06pm by drwls*

**Classical Mechanics**

During a track event two runners, Mary, and Alice, round the last turn and head into the final stretch with Mary a distance d = 2.0 m in front of Alice. They are both running with the same speed of v0= 5.0 m/s. When the finish line is a distance L= 45.0 m away from Alice, ...
*Sunday, September 15, 2013 at 6:54am by rya*

**Velocity and Acceleration**

If it's sliding backwards but slowing down, that's v<0 a>0 a car traveling with constant speed in a circle has a constant acceleration (toward the center of the circle) but a changing velocity.
*Wednesday, October 5, 2011 at 10:14pm by Steve*

**physics multiple choice**

Far from any gravity, an astronaut accidentally releases a metal wrench inside a spaceship that is traveling at a constant velocity of 250 km/s away from earth in outer space. What will be the subsequent behavior of that wrench as observed by the astronaut? A. It will fall to ...
*Wednesday, February 2, 2011 at 4:43pm by mely*

**physics multiple choice**

Far from any gravity, an astronaut accidentally releases a metal wrench inside a spaceship that is traveling at a constant velocity of 250 km/s away from earth in outer space. What will be the subsequent behavior of that wrench as observed by the astronaut? A. It will fall to ...
*Wednesday, February 2, 2011 at 8:27pm by andrea*

**Physics**

An ice sled powered by a rocket engine starts from rest on a large frozen lake and accelerates at +13.0 m/s^2. At t1 the rocket shut down and the sled moves with constant velocity v until t2. The total distance traveled by the sled is 5.30 x 10^3m and the total time is 90s. ...
*Tuesday, August 31, 2010 at 10:21pm by Kahlei*

**algebra**

You do not say if it is a cylinder (sides straight up and down) or some other shape like a cone or a half sphere or whatever. If the sides go straight up then 30 h = 120 h = 4 meters If it is a cone or pyramid (straight sloping sides) (1/3) (30) h = 120 h = 12 meters
*Wednesday, October 27, 2010 at 9:10pm by Damon*

**Physics**

(a) At rocket cutoff, it changes from accelerating at 1.5 m/s^2 to decelerating at rate -g = -9.8 m/s^2. (b) At 120 m cutoff, the rocket's velocity V is given by V^2 - 58^2 = 2 a X = 360 m^2/s^2 V = 61.02 m/s Maximum height occurs t = 61.02/9.8 = 6.23 s later. Additional ...
*Tuesday, February 7, 2012 at 6:56pm by drwls*

**Applying Algebraic Thinking to Data**

Snoopy is in his plane, 4500 ft above ground. he fires a projectile straight up. The Vo of the projectile is 340 ft/s. (after the projectile is fired, it has no acceleration, so its height can be modeled by a "falling body" model). The Red baron is maintaining a constant ...
*Friday, April 20, 2012 at 7:49pm by Rachelle*

**physics**

What would be the resulting acceleration if a 7.0 kg shot put was launched with a force of 140 N?
*Thursday, December 2, 2010 at 4:57pm by Stella*

**physics**

You have to know the vertical acceleration, and the time the rocket was ignited.
*Monday, September 6, 2010 at 11:14am by bobpursley*

**Science help! URGENT. Check answers**

1. True or False? A model train traveling at a constant speed around a circular track has a constant velocity. (False) 2.Which of the following would be affected if a soaring eagle changed direction but remained at a constant speed? acceleration only velocity only acceleration...
*Tuesday, October 15, 2013 at 1:54pm by Elena*

**Science Struggle**

Rocket-powered sleds are been used to test the responses of humans to acceleration. Starting from rest, one sled can reach a speed of 533 m/s in 2.45 s and can be brought to a stop again in 2.37 s. Find the acceleration of the sled when braking. Answer in units of m/s^2
*Thursday, September 13, 2012 at 10:36pm by Bri*

**physics**

A 9.3 kg firework is launched straight up and at its maximum height 45 m it explodes into three parts. Part A (0.5 kg) moves straight down and lands 0.29 seconds after the explosion. Part B (1 kg) moves horizontally to the right and lands 10 meters from Part A. Part C moves to...
*Monday, December 22, 2008 at 11:48pm by seth*

**physics**

First calculate the burnout velocity (Vbo) and altitude (Hbo). Vbo = a*t = 91.9*1.53 = 140.6 m/s Hbo = (a/2)t^2 = 107.6 m The additional distance Hco that the rocket coasts upward can be calculated assuming conservation of energy. g*Hco = Vbo^2/2 Hco = 1008.6 m Hmax = Hbo + ...
*Friday, March 15, 2013 at 6:20pm by drwls*

**MOMENTUM AND SHM**

A(n) 3800 kg rocket traveling at 2500 m/s is moving freely through space on a journey to the moon. The ground controllers ﬁnd that the rocket has drifted oﬀ course and that it must change direction by 9.2 degrees if it is to hit the moon. By radio control the ...
*Friday, December 10, 2010 at 9:53pm by Jaylee*

**PHYSICS MOMENTUM **

A(n) 3800 kg rocket traveling at 2500 m/s is moving freely through space on a journey to the moon. The ground controllers ﬁnd that the rocket has drifted off course and that it must change direction by 9.2 degrees if it is to hit the moon. By radio control the rocket’s ...
*Sunday, December 12, 2010 at 7:46pm by Jaylee*

**mitx 8.01x Classical Mechanics **

During a track event two runners, Mary, and Alice, round the last turn and head into the final stretch with Mary a distance d = 2.0 m in front of Alice. They are both running with the same speed of v0= 5.0 m/s. When the finish line is a distance L= 45.0 m away from Alice, ...
*Tuesday, September 10, 2013 at 7:14pm by youlife*

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