Friday

April 18, 2014

April 18, 2014

Number of results: 71,680

**Physics**

A small 7.10kg rocket burns fuel that exerts a time-varying upward force on the rocket. This force obeys the equation F = A + Bt^2. Measurements show that at t = 0, the force is 121.0N, and at the end of the first 2.10s , it is 176.0N. Part A Find the net force on this rocket ...
*Sunday, September 20, 2009 at 3:59pm by Dreskillz89*

**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 *

**Science**

In a rocket, fuel burns at the rate of 1kg/s. This fuel is Ejected from the rocket with a velocity of 60km/s. What force will be exerted on the rocket?
*Friday, February 10, 2012 at 12:49pm by Kushagra*

**Physics**

I dont think it can be worked, without knowing how long the engine burns. The rocket is not a projectile until the fuel burns out. The launch speed is easy, it starts at zero veloicty, the rocket burns and it is accelerated upward.
*Wednesday, September 10, 2008 at 2:59pm by bobpursley*

**physic**

Consider a rocket in space that ejects burned fuel at a speed of 1.5 km/s with respect to the rocket. The rocket burns 9 % of its mass in 310 s (assume the burn rate is constant). (a) What is the speed of the rocket after a burn time of 155.0 s? (suppose that the rocket starts...
*Friday, December 6, 2013 at 10:33am by juanpro*

**Physics**

Consider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 8 % of its mass in 300 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 150.0 s? (suppose that the rocket...
*Friday, December 6, 2013 at 4:33pm by KS*

**PHYSICS(elena)**

Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 8 % of its mass in 280 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 140.0 s? (suppose that the rocket...
*Sunday, December 8, 2013 at 6:09am by Anonymous*

**PHYSICS IMP PLS**

Consider a rocket in space that ejects burned fuel at a speed of v_ex= 2.0 km/s with respect to the rocket. The rocket burns 10 % of its mass in 290 s (assume the burn rate is constant). (a) What is the speed of the rocket after a burn time of 145.0 s? (suppose that the rocket...
*Sunday, December 8, 2013 at 1:58am by ROMA*

**Classical Mechanics Physics**

Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 6 % of its mass in 310 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 155.0 s? (suppose that the rocket...
*Friday, December 6, 2013 at 3:40pm by Anonymous*

**Classical Mechanics Physics - Urgent help please**

da can u help m for above question rocket onsider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 11 % of its mass in 250 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn...
*Saturday, December 7, 2013 at 5:46pm by kumar*

**physics I'M STUCK PZL HELP**

hai Teresa can u help me for this Rocket question i don't know how to get 0.955 in the above ans ! Consider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 11 % of its mass in 250 s (assume the burn rate is ...
*Sunday, December 8, 2013 at 12:30pm by kumar *

**physics I'M STUCK PZL HELP**

hai Teresa can u help me for this Rocket question i don't know how to get 0.955 in the above ans ! Consider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 11 % of its mass in 250 s (assume the burn rate is ...
*Sunday, December 8, 2013 at 12:30pm by kumar *

**Classical Mechanics Physics - Urgent help please**

greco can you please solve for my rocket question Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 9 % of its mass in 310 s (assume the burn rate is constant). (a) What is the speed v of the rocket ...
*Saturday, December 7, 2013 at 5:46pm by KS*

**physicS IMP PLS**

Consider a rocket in space that ejects burned fuel at a speed of Vex = 1.5 km/s with respect to the rocket. The rocket burns 5% of its mass in 280 seconds. (a) What is the speed V of the rocket after a burn time of 140 seconds (in m/s)? (b) What is the instantaneous ...
*Monday, December 9, 2013 at 6:34am by Hil*

**Classical Mechanics - Need Help Please**

woooooooooo thx @Hw !did u got this correct Consider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 11 % of its mass in 250 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a ...
*Sunday, December 8, 2013 at 3:38am by kumar*

**physics Classical Mechanics**

Greco plz help ! i try using that formula but is not working this is my question Consider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 11 % of its mass in 250 s (assume the burn rate is constant). (a) What ...
*Sunday, December 8, 2013 at 11:14am by kumar*

**physics Classical Mechanics**

Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 8 % of its mass in 280 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 140.0 s? (suppose that the rocket...
*Sunday, December 8, 2013 at 12:26pm by Andy*

**Classical Mechanics Physics - Urgent help please**

HAI vivop if u got green tick on this plz help m c onsider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 11 % of its mass in 250 s (assume the burn rate is constant). (a) What is the speed v of the rocket ...
*Saturday, December 7, 2013 at 5:46pm by kumar*

**Phisics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 8 % of its mass in 280 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 140.0 s? (suppose that the rocket...
*Sunday, December 8, 2013 at 7:16am by Anonimus*

**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 small weather rocket weighs 14.7 N. The rocket is carried up by a balloon. The rocket is released from the balloon and fired, and its engine exerts an upward force of 10.2 N on the rocket. What is the acceleration of the rocket?
*Wednesday, August 17, 2011 at 10:40pm by Anonymous*

**physics**

i need help figuring out what formaula to use for finding the final velocity of a rocket. Model rocket engines are sized by thrust, thrust duration, and total impulse, among other characteristics. A size C5 model rocket engine has an average thrust of 5.26 N, a fuel mass of 12...
*Tuesday, October 7, 2008 at 10:40pm by sonia*

**physics**

A small weather rocket weighs 15.5 N. The rocket is carried up by the balloon. The rocket is released from the balloon and fired, but its engine exerts an upward force of 11.0 N. What is the acceleration of the rocket?
*Sunday, October 3, 2010 at 5:16pm by devon*

**physics**

Consider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 10 % of its mass in 340 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 170.0 s? (suppose that the ...
*Friday, December 6, 2013 at 4:18pm by anonymous*

**physics**

Model rocket engines are sized by thrust, thrust duration, and total impulse, among other characteristics. A size C5 model rocket engine has an average thrust of 5.26 N, a fuel mass of 12.7 g, and an initial mass of 25.5 g. The duration of its burn is 1.90 s. (a) What is the ...
*Tuesday, October 7, 2008 at 10:08pm by tom*

**Physics**

The solid fuel of a 300.kg rocket travelling at 1.64x104 km/h is ignited to correct the rocket trajectory in mid-flight to Mars. 10.00 kg of fuel is burnt in 15.00 s. If the exhaust velocity of the fuel, relative to the rocket, is 2.90x103 km/h, what is the acceleration of the...
*Friday, October 26, 2012 at 3:29pm by Jeff*

**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*

**Math**

A prototype rocket burns 159 gallons of liquid hydrogen fuel each sound during a regular launch. Make a table that shows how many gallons of fuel are burned after 2,3,5, and 10 seconds.
*Thursday, April 3, 2014 at 6:48pm by Anonymous*

**Physics**

A model rocket is launched vertically upward from the ground. After 4.3s, its fuel is completely burned. Assume uniform acceleration of 3.0 m/s2 while the fuel is burning. What is the velocity of the rocket at the instant that the fuel is completely burned? What's the rocket's...
*Wednesday, January 4, 2012 at 5:24pm by Leasha*

**PHYSICS IMP PLS**

The center of gravity of the fuel/rocket system does not move. There is no net force on the rocket-fuel system. The rocket goes right, the fuel goes left. The momentum of the fuel to the left is equal and opposite to the momentum of the rocket to the right. The rocket pushes ...
*Sunday, December 8, 2013 at 1:58am by Damon*

**physics**

a 4 kg model rocket is launched, shooting 50 kg of burned fuel from its exhaust at an average velocity of 625 m/s. What is the velocity of the rocket after the fuel has burned.? Ignore effects of gravity and air resistance.
*Monday, January 31, 2011 at 3:13pm by collin*

**Physics**

The mass of a rocket car plus fuel is 2,000kg. The rocket car starts from rest. The engine expels fuel(in the form of exhaust) over a period of 8 seconds. The exhaust has a velocity of 1,000m/s due west, and the velocity of the rocket car after 8 seconds is 90m/s due east. How...
*Sunday, April 29, 2012 at 10:44pm by Sarah*

**Physics**

The mass of a rocket car plus fuel is 2,000kg. The rocket car starts from rest. The engine expels fuel(in the form of exhaust) over a period of 8 seconds. The exhaust has a velocity of 1,000m/s due west, and the velocity of the rocket car after 8 seconds is 90m/s due east. How...
*Monday, April 30, 2012 at 5:39pm by Sarah*

**physics**

A model rocket is launched from rest with an upward acceleration of 5.50 m/s^2 and, due to a strong wind, a horizontal acceleration of 1.50m/s^2 . How far is the rocket from the launch pad 7.20 later when the rocket engine runs out of fuel?
*Monday, September 24, 2012 at 5:48pm by katelin*

**Physics**

Sorry for posting so many, but I just need to make sure I'm on the right track. Just need someone to check my working and answers. A rocket has a mass 3000kg. The fuel used in the rocket has an additonal mass of 500kg. At the launch, the rocket accelerates at 4m/s/s. Using 10m...
*Thursday, November 6, 2008 at 6:26am by JC*

**phyicis**

Homer Hickham and his buddies launched model rockets in the late 1950's when the US was trying to get a rocket into space. If homer launches a rocket from rest and its engine delivers a constance acceleration of 8.2 m/s^2 for 5.0seconds after which the fuel is used up by the ...
*Monday, October 29, 2012 at 1:18pm by Matt*

**physics**

A stationary rocket is launched vertically upward. After 4s, the rocket's fuel is used up and it is 225.6 m above the ground. At this instant the velocity of the rocket is 112,8 m/s. Then the rocket undergoes free fall. Ignore the effect of the air friction.Assume that g does ...
*Saturday, March 8, 2014 at 3:08pm by clement*

**physiccs**

a rocket that has consumed all of its fuel continues to move upward slowed mostly by the force of gravity. If the rocket's mass is 75.0 g and it takes 1.2 sec for the rocket to stop, what is the change in the rocket's momentum? what is the rockets stopping distance?
*Monday, November 2, 2009 at 7:01pm by arriell*

**physics**

A 1000m3 rocket weighing 2.0x10^3 kg is going to be launched into space. On ignition, gas is expelled from the bottom of the rocket at a speed of 2.4x10^3 m/s relative to the rocket. The rate at which the fuel is consumed is 8.02kg/s. Is there a time delay between ignition and...
*Wednesday, March 31, 2010 at 12:28pm by J*

**Physics**

A typical model rocket has a mass of 50 g. Similarly, a typical "class C" model rocket engine can produce a total impulse of 10 Newton-seconds. We usually launch model rockets vertically, but if I instead launched this rocket horizontally, how fast would it be going in m/s ...
*Monday, May 6, 2013 at 4:54pm by KK*

**physics**

A rocket flies upward with a velocity of 1050 km/h and at an angle of 30 degrees to the vertical. If the rocket runs out of fuel determine: (i) The maximum additional altitude, h. (ii) The corresponding time. (iii) The horizontal distance at this time The gravitational ...
*Saturday, July 9, 2011 at 1:58am by sand*

**chemistry**

. of oxidizer rockets often carry liquid propellant. Either fuel or oxidizer or both can be liquid. A rocket needs both. A jet engine only has to carry fuel. In a solid fuel rocket, the fuel and oxizer are premixed. There ars such things as hybrid rockets, with both solid and ...
*Wednesday, January 13, 2010 at 11:55am by drwls*

**PHYSICS**

Model rockets are lightweight rockets powered by very small engines. A typical model rocket has a mass of 5g.Similarly, a typical "class C" model rocket engine can produce a total impulse of 10 Newton-seconds. We usually launch model rockets vertically, but if I instead ...
*Friday, October 11, 2013 at 7:56am by boss*

**Physics**

A rocket whish is in deep space and initially at rest relative to an inertial reference frame, has a mass of 2.55 X 10^5 kg of which 1.81 X10^5 kg is fuel. The rocket engine is then fired for 250 s during which feul is consumed at the rate of 480 kg/s. The speed of the exhaust...
*Friday, February 2, 2007 at 4:08pm by Tammy*

**physics**

a rocket is fire vertically and ascends with constant vertical axceleration of 20 m/s^2 for 1min. its fuel is then all used and it continues to move as a free falling bodyn neglexting rhe variation of g altitude, compute a) the max altitude reached by the rocket and b) the ...
*Sunday, April 28, 2013 at 10:40am by gladys*

**computer science**

I need help one how create a spreadsheet that will give an accurate launch profile for a vertical liftoff for the SpaceX Falcon 9 rocket. the information they give me is: •Start with a rocket with a mass, M1, moving with a speed, v1 •The rocket expels some small mass, Δm...
*Saturday, April 13, 2013 at 6:37pm by Greg*

**motion,physics**

Model rockets are lightweight rockets powered by very small engines. A typical model rocket has a mass of 5g.Similarly, a typical "class C" model rocket engine can produce a total impulse of 10 Newton-seconds. We usually launch model rockets vertically, but if I instead ...
*Friday, October 11, 2013 at 10:55am by Physics*

**Physics**

A 4.40-kg model rocket is launched, shooting 53.0 g of burned fuel from its exhaust at an average velocity of 650 m/s. What is the velocity of the rocket after the fuel has burned? (Ignore effects of gravity and air resistance.)
*Thursday, November 10, 2011 at 4:24pm by Eddie *

**Physics**

A 4.40-kg model rocket is launched, shooting 53.0 g of burned fuel from its exhaust at an average velocity of 650 m/s. What is the velocity of the rocket after the fuel has burned? (Ignore effects of gravity and air resistance.)
*Thursday, November 10, 2011 at 4:24pm by Eddie *

**Physics**

A 4.40-kg model rocket is launched, shooting 53.0 g of burned fuel from its exhaust at an average velocity of 650 m/s. What is the velocity of the rocket after the fuel has burned? (Ignore effects of gravity and air resistance.)
*Thursday, November 10, 2011 at 4:24pm by Eddie *

**Physics**

A 4.40-kg model rocket is launched, shooting 53.0 g of burned fuel from its exhaust at an average velocity of 650 m/s. What is the velocity of the rocket after the fuel has burned? (Ignore effects of gravity and air resistance.)
*Thursday, November 10, 2011 at 4:24pm by Eddie *

**physics**

1. Using the acceleration and time, calculate the velocity and height at fuel burnout. Then figure the height the rocket can go above this with that initial velocity. Add the heights to get the maximum altitude. Here is a second way. Energy put into rocket = change in PE Force...
*Saturday, September 18, 2010 at 6:45pm by bobpursley*

**Physics**

A rocket is launched at an angle of 50.0° above the horizontal with an initial speed of 105 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 32.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. (a) ...
*Sunday, September 15, 2013 at 8:28pm by <3*

**Physics**

A rocket is fired at a speed of 50.0 m/s from ground level, at an angle of 46.0 ° above the horizontal. The rocket is fired toward an 18.7-m high wall, which is located 23.0 m away. The rocket attains its launch speed in a negligibly short period of time, after which its ...
*Saturday, September 7, 2013 at 9:29pm by WR*

**Physics**

A rocker acceleratess up ar 5m/s/s for 10s and at which point the fuel is exhusted, and then the rocket continues upwards in free fall. a)How high does teh rocket riseb)What total time does the rocket spend in the air? b) What total time does the rocket spend in the air? The ...
*Tuesday, September 19, 2006 at 6:05pm by Billie*

**physics I'M STUCK PZL HELP**

Hi Teresa, in my problem, question says The rocket burns 10 % of its mass in 290 s (assume the burn rate is constant). What is the speed of the rocket after a burn time of 145.0 s? How did you find 4.5% is burned in 155 sec? Pls. Thank you very much
*Sunday, December 8, 2013 at 12:30pm by ROMA*

**physics**

Rockets A and B are fired straight upward from rest. Rocket A is launched first and accelerates at 11.2 m/s2. Rocket B is launched 2.10 s after Rocket A and B accelerates at 14.6 m/s2. Solve for the moment in time when the rockets are separated by 484 m. a) how long after ...
*Sunday, October 17, 2010 at 6:10pm by Haley*

**Physics**

A toy rocket is launched upwards from rest. The rocket engine will cause the rocket to accelerate at 25 m/s^2 for 3.0 seconds. a) How fast is the rocket moving aft the end of the 3 seconds? b) What is the maximum height reached by the rocket? c) What is the total time the ...
*Thursday, October 7, 2010 at 10:04pm by Sam*

**calculus**

An automobile computer gives a digital readout of fuel consumption in gallons per hous. During a trip, a passenger recorded the fuel consumption every 5 minutes for a full hour of travel. time: 0 / gal/h: 2.5 time: 5 / gal/h: 2.4 time: 10 / gal/h: 2.3 time: 15 / gal/h: 2.4 ...
*Friday, October 26, 2007 at 12:14am by Anonymous*

**gr 11 physics**

as a rocket carrying a space probe acceleraes away from earth the fuel is being used up and the rocket's mass becomes less when teh mass of a rocket(and its fuel) is M and the distance of teh rocket from eart's centre is 1.5rE, the force of gravitational attraction between ...
*Thursday, November 26, 2009 at 10:48pm by mat*

**physics**

A rocket has a per-ignition mass of 1100kgs-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 a rocket to accelerate in space. (i cant work it outt. i know it involves the rocket thrust equation ...
*Wednesday, February 15, 2012 at 5:01pm by beavis*

**physics**

A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 29.4 . The acceleration period lasts for time 9.00 until the fuel is exhausted. After that, the rocket is in free fall. Find the maximum height reached by the rocket. ...
*Wednesday, May 25, 2011 at 8:51pm by ahhhh!*

**physics**

A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 49.0 . The acceleration period lasts for time 6.00 until the fuel is exhausted. After that, the rocket is in free fall. Find the maximum height reached by the rocket. ...
*Thursday, September 8, 2011 at 9:12pm by Anonymous*

**Physics**

A rocket moves upward, starting from rest with an acceleration of 28.3 m/s2 for 5.50 s. It runs out of fuel at the end of the 5.50 s, but does not stop. How high does it rise above the ground? Answer in units of m
*Tuesday, September 17, 2013 at 10:45pm by Anonymous*

**physics**

A rocket, initially at rest on the ground, accelerates straight upward with a constant acceleration of 34.3 . The rocket accelerates for a period of 8.00 before exhausting its fuel. The rocket continues its ascent until its motion is halted by gravity. The rocket then enters ...
*Monday, September 19, 2011 at 8:46pm by Karina*

**physics**

A 1680- kg rocket is launched with a velocity v0 = 55 m/s against a strong wind. The wind exerts a constant horizontal force Fwind = 15600 N on the rocket. At what launch angle will the rocket achieve its maximum range?
*Monday, December 5, 2011 at 3:14pm by leav*

**physics**

A rocket burns 5kg per ejecting it as a gas with a velocity of 1600m/s relative to the rocket. How much force is exerted on the rocket. Also find the velocity exerted when its mass reduces to 1/200 of its initial mass.
*Wednesday, September 5, 2012 at 12:29pm by Rano*

**physics**

A rocket is fired straight up and accelerates upward at 24 m/s2 for 12 seconds. The rocket then runs out of fuel and coasts. Ignore any air resistance effects and use -9.8 m/s2 for the local acceleration due to gravity. a) What is the rocket’s maximum altitude? b) How long is ...
*Wednesday, September 28, 2011 at 3:18pm by help*

**Physics**

A small rocket weighs 14.7 newtons. The rocket is fired from a high platform but it's engine fails to burn properly. The rocket gains total upward force if only 10.2 newtons. At what rate and in what direction is the rocket accelerated?
*Wednesday, February 19, 2014 at 8:41pm by Alex*

**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 rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 58.8m/s^2 . The acceleration period lasts for time 8.00s until the fuel is exhausted. After that, the rocket is in free fall. Find the maximum height y_max reached by ...
*Tuesday, June 1, 2010 at 7:56pm by johnny*

**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*

**physics**

.10 kilogram rocket designed to deliver an impulse of 6 newtons seconds. If the rocket engine burns .75 seconds, what average force does it produce.
*Monday, November 18, 2013 at 10:20pm by trent*

**physics**

A rocket burnt fuel av the rate of 20kgs^4 and eject it with a velocity of 5.0*10^3ms^-1. Calculate the thrust exerted by the gas on the rocket.
*Wednesday, August 31, 2011 at 2:48am by john*

**physics-forces**

1. a fully loaded rocket has a mass of 2.92x10^6kg. It's engines has a thrust of 3.34x10^7N a)what is the downward force of gravity of the rocket at blast off? b)what is the unbalanced force on the rocket at blast off? c)what is the accleration of the rocket as it leaves the ...
*Monday, January 6, 2014 at 7:37pm by Jessie*

**physics**

an airplane is diving at a speed of 300 km/h and the angle betweent he plane's dive path and the vertical is 50 degrees. The plane launches a rocket which lands at 750m horizontally from beneath the launch point. a) find the flight time of the rocket and b) how high was the ...
*Thursday, November 2, 2006 at 4:11pm by nix*

**physics**

A rocket is launched straight up with a constant acceleration. Three seconds after lift off, a small part of the rocket falls off the side. The small part hits the ground 7 seconds later. Ignoring air resistance, what was the acceleration of the rocket?
*Monday, October 3, 2011 at 12:26am by anonymous*

**Physics**

Can someone help me find Delta Time for the first 150 meters of this question. Everytime I try and get it by using the quadratic formula I get two negative numbers which I don't think is right. A model rocket is launched straight upward with an initial speed of 50.0m/s. It ...
*Friday, September 28, 2007 at 3:43pm by Dustin*

**Physics**

A rocket is fired vertically with an upward acceleration of 30 m/s2. After 20 s, the engine shuts off and the rocket then continues rising (while in free-fall). The rocket eventually stops rising and then falls back to the ground. (a) What is the highest point the rocket ...
*Monday, September 13, 2010 at 11:35pm by Jackie*

**Math**

A satellite launch rocket has a cylindrical fuel tank. The fuel tank can hold V cubic meters of fuel. If the tank measures d meters across, what is the height of the tank in meters?
*Wednesday, October 23, 2013 at 7:51am by Leen*

**physics**

A rocket is launched at an angle of 56.0° above the horizontal with an initial speed of 101 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 29.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. What...
*Tuesday, November 16, 2010 at 5:12am by kayla*

**physics**

A rocket is launched at an angle of 56.0° above the horizontal with an initial speed of 101 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 29.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. What...
*Tuesday, November 16, 2010 at 5:13am by kayla*

**physics**

A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 49.0 . The acceleration period lasts for time 10.0 until the fuel is exhausted. After that, the rocket is in free fall. What's the max height? Ignore air resistance and ...
*Wednesday, September 28, 2011 at 3:33pm by Uzz*

**Physics**

Assume full mass of rocket is m, before igniting. If one assumes the mass of the rocket does not change when burning fuel.. nettrust*time=mass*velocityatburnout ma*time=m*vburnout 28.1*5.21=vburnout. how high has it went at burnout? Vf=2ah where vf=burnout velocity. solve for ...
*Saturday, October 5, 2013 at 8:19pm by bobpursley*

**Physics**

The Spent Rocket Parts: During launches, rockets often discard parts. A certain rocket starts from rest on the launch pad and accelerates upward at a steady 3.3 m/s2. When it is 235 m above the launch pad, the rocket discards a used fuel canister by simply disconnecting it. ...
*Tuesday, November 20, 2012 at 10:40pm by Zalak*

**Intermediate Algebra**

A model rocket is launched from a height of 50 feet. the formula: h=-16t^2+70t+50 describes the rocket's height,h,in feet t seconds after it was launched. how long will it take the rocket to reach the ground.
*Monday, November 19, 2012 at 5:41pm by nicole*

**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? physics - bobpursley, Thursday, February 3, 2011 at...
*Thursday, February 3, 2011 at 9:17pm by help*

**Physics**

Imagine a fender bender between a large truck and a small car. During the impact, Choose one answer. a. the truck exerts a greater amount of force on the car than the car exerts on the truck b. the car exerts a greater amount of force on the truck than the truck exerts on the ...
*Friday, February 8, 2013 at 2:59pm by Kirk*

**Quadratic equation...**

Hi Can anyone help me solve the quadratic equation for the following:- The motion of a two stage rocket is stated by it height y in metres above the ground since t seconds since launch. Flies vertically Ist stage burns for 5 seconds and cuts out. 2nd stage rocket is under ...
*Saturday, December 1, 2007 at 12:46pm by Leo*

**Physics**

A rocket blasts off with acceleration of 5 m/s squared. After 1 min it runs out of fuel. What is the max height and total time in the air?
*Tuesday, October 28, 2008 at 7:11pm by Jack*

**math**

2candles,one green and one red,are lit at the same time.The green candle burns twice as fast as the red one.The green candle burns burns out after 6 hours,how much time will elapse before the red candle burns out ?
*Saturday, March 16, 2013 at 7:09am by wan*

**physics**

A test rocket is launched vertically from ground level (y = 0 m), at time t = 0.0 s. The rocket engine provides constant upward acceleration during the burn phase. At the instant of engine burnout, the rocket has risen to 49 m and acquired a velocity of What is the maximum ...
*Thursday, September 26, 2013 at 12:36pm by D*

**physics please help**

A rocket, initially at rest on the ground, accelerates straight upward with a constant acceleration of 29.4 . The rocket accelerates for a period of 10.0 before exhausting its fuel. The rocket continues its ascent until its motion is halted by gravity. The rocket then enters ...
*Saturday, August 21, 2010 at 12:52am by Anonymous*

**physics**

I would use energy concepts. Launch energy: 1/2 m 60^2 engine energy: F*d=ma*d=m*2*130 work done on gravity at the top: mg*h mg*h=1/2 m 60^2+m*260 solve for h. For b) find time to the rocket burns out, then add the glide time to the final heights. c. Add the fall time.
*Monday, September 6, 2010 at 11:30am by bobpursley*

**physics**

Initially a small car and a truck are at rest then the car starts pushing a dead battery truck and they both accelerate. Which of the following statement is true? a)The car exerts a larger force on the truck than the truck exerts on the car. b) The car exerts the same amount ...
*Friday, November 4, 2011 at 9:47pm by Cindy*

**Math**

A small truck is to be driven 300 miles on a freeway at a constant speed of x miles per hour. Speed laws on the freeway require that a truck must be driven between 30 miles per hour and 70 miles per hour. assume that fuel cost $3.50 per gallon. in addition, assume that for a ...
*Tuesday, April 24, 2007 at 3:10am by nancy*

**Phisics**

A rocket is launched at an angle of 59.0° above the horizontal with an initial speed of 103 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 31.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. (a) ...
*Wednesday, September 12, 2012 at 4:09pm by Kali*

**physics**

A rocket if fired vertically up from ground with resultant vertical acceleration of 5m/s.The fuel is finished after 2 minutes and the rocket continues to for sometime.How long after fire the max height will be reached?
*Sunday, September 18, 2011 at 12:47pm by Tumur*

**physics**

When it is 152 m above the ground, a rocket traveling vertically upward at a constant 9.50 m/s relative to the ground launches a secondary rocket at a speed of 12.4 m/s at an angle of 50.0 degrees above the horizontal, both quantities being measured by an observer sitting in ...
*Wednesday, November 17, 2010 at 8:38pm by alejandrob*

**Physics**

Which requires more fuel- a rocket going from the earth to the moon or a rocket coming from the moon to earth? Please explain why. Thank you so much :)
*Saturday, May 14, 2011 at 9:12am by Rebekkah*

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