Saturday

February 28, 2015

February 28, 2015

Number of results: 80,429

**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 ...
*September 20, 2009 by Dreskillz89*

**science**

a small weather rocket weighs 20.5 N. The rocket is carried up into the air by a balloon. The rocket is released from the balloon and fired. What is the acceleration of the rocket if an upward force of 25 N is applied? Net force = force up - force down. force down is its ...
*December 30, 2006 by leafprincess*

**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?
*August 17, 2011 by Anonymous*

**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?
*October 3, 2010 by devon*

**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?
*February 10, 2012 by Kushagra*

**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...
*November 6, 2008 by JC*

**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?
*November 2, 2009 by arriell*

**physics**

At time t=0, a 2150kg rocket in outer space fires an engine that exerts an increasing force on it in the +x-direction. This force obeys the equation Fx=At2, where 1.45s is time, and has a magnitude of 781.25N when t = 1.45s . Find the SI value of the constant A.
*September 28, 2013 by lhyra*

**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?
*February 19, 2014 by Alex*

**Physics Help**

A constant force of 100N , directed upward, is applied to a 5.0kg toy rocket by the rocket's engine. What is the rocket's acceleration? I used the equation a= F/m to get 20 m/s2 but it was wrong and I don't know where to go from here still?
*February 15, 2014 by Eiban*

**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?
*May 10, 2012 by Haley *

**physics**

a toy rocket is fired upward with a net force of 50N. Because of this force it accelerates at 25m/s^2. What is the mass of the rocket?
*November 16, 2013 by kim*

**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...
*December 6, 2013 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...
*December 6, 2013 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...
*December 8, 2013 by Anonymous*

**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 ...
*January 6, 2014 by Jessie*

**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...
*December 8, 2013 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...
*December 6, 2013 by Anonymous*

**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 ...
*March 8, 2014 by clement*

**Physics**

I have to design a procedure which allows me to calculate the applied rocket thrust force of a stomp rocket. The only materials I am allowed are stop watches, rulers, measuring tape, protractors and the stomp rocket. Basically it all has to be done mathimatically. I so far ...
*July 22, 2010 by Mackenzie*

**Physics **

A 19 N thrust is exerted on a 0.4 kg rocket for a time interval of 8 s as it moves straight up. (Neglect all forces except this thrust and the force of gravity.) The rocket then continues to move upward as its speed reduces steadily to zero. (a) What is the maximum height that...
*October 9, 2012 by arcos15*

**Physics **

A 19 N thrust is exerted on a 0.4 kg rocket for a time interval of 8 s as it moves straight up. (Neglect all forces except this thrust and the force of gravity.) The rocket then continues to move upward as its speed reduces steadily to zero. (a) What is the maximum height that...
*October 9, 2012 by arcos15*

**Physics**

I have to design a procedure which will allow me to calculate the applied force(thrust) of a stomp rocket. We are allowed to use tools to find measurements. So far, I have calculated the height that the rocket reached (22.5) m using trig. (right angle triangle where one angle ...
*July 22, 2010 by Mackenzie*

**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 ...
*December 9, 2013 by Hil*

**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...
*February 15, 2012 by beavis*

**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?
*December 5, 2011 by leav*

**physics**

During a lift off , the thrust a rocket produces must overcome the force of gravity in order to lift the rocket off the ground. If a rocket with a mass of 5kg produces a force of 180N, how fast will the rocket be travelling 3 seconds after ignition?
*August 18, 2010 by Cassy*

**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. ...
*November 20, 2012 by Zalak*

**physics**

The rate of burning of fuel in a rocket is 50 g/sec and comes out with a velocity 4X1000 sec. then find the force extended by fuel on the rocket.
*August 5, 2014 by nisha*

**physics**

if a rocket engine delivers a constant thrust, does it deliver more power as the rocket speeds up force = mass*(acceleration) if the rocket accelerates, the force will increase wow,uh constant thrust means it is delivering constant power. the kenetic potential of the rocket ...
*October 30, 2006 by nicole*

**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...
*October 26, 2012 by Jeff*

**Physics**

A rocket of mass 1.0x10^3kg is being fired to a height of 5.0 x 10^3 m. The rocket engine shuts off when the rocket reaches a height of 1.0x10^3m, and the rocket coasts up to 5.0 x 10^3 m. A) What velocity must the rocket have at the 1.0x10^3 m point to enable it to reach 5.0 ...
*October 28, 2012 by Chris*

**Physics**

A rocket was launched and it now has an acceleration of 3m pers second squared upwards.the mass of the rocket is 5000kg.calculate the net force acting on the rocket and the upthrust exerted by the exhaust gases on the rocket.
*February 4, 2013 by Tshephiso*

**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...
*January 4, 2012 by Leasha*

**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.
*September 5, 2012 by Rano*

**Physics**

A typical model rocket engine exerts an average force of 5 N on its exhaust gas. How much average thrust force does the gas exert on the engine and rocket?
*November 7, 2010 by Melissa*

**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...
*December 8, 2013 by Andy*

**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...
*October 7, 2008 by sonia*

**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 ...
*November 26, 2009 by mat*

**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 ...
*December 6, 2013 by anonymous*

**physics**

A model rocket is propelled upward by a cylinder of compressed water. The cylinder emits water at a rate of 0.050 kg/second with an exit speed of 80.0 m/s. Initially, the rocket has a mass of 0.15 kg, including the water cylinder. What is the rocket's initial upward ...
*September 19, 2010 by Angela*

**physics**

A model rocket is propelled upward by a cylinder of compressed water. The cylinder emits water at a rate of 0.050 kg/second with an exit speed of 80.0 m/s. Initially, the rocket has a mass of 0.15 kg, including the water cylinder. What is the rocket's initial upward ...
*September 20, 2010 by Angela*

**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...
*December 8, 2013 by Anonimus*

**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.
*November 18, 2013 by trent*

**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...
*November 5, 2006 by harry*

**Physics**

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10~m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
*March 7, 2013 by John*

**physics**

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10 m/s2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
*March 8, 2013 by Anonymous*

**Physics**

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10~m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
*March 10, 2013 by John*

**physics**

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10 m/s2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
*March 10, 2013 by Anonymous*

**physics**

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10 m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
*March 12, 2013 by Jacobb*

**Physics**

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10~m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
*March 12, 2013 by John*

**Science**

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10 m/s2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
*June 2, 2013 by Elouisa*

**Math (calculus)**

Prof gave us this question to practice but I do not know how to solve it. If you know please provide step by step with the answer so I can understand it. Thank you very much :) Suppose a rocket is launched from the ground with 10 seconds worth of fuel. The rocket has an upward...
*November 16, 2014 by Anonymous*

**Physics**

A rocket blasts off vertically from rest on the launch pad with an upward acceleration of 2.30 . At 10.0 after blastoff, the engines suddenly fail, which means that the force they produce instantly stops. How high above the launch pad will the rocket eventually go? Find the ...
*September 10, 2006 by JC*

**physics**

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10 m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg? Please give your answer with solution .
*June 24, 2013 by anonymous*

**physics**

A fully loaded Saturn V rocket has a mass of 2.92*10^6. Its engines have a thrust of 3.34*10^7 N What is the unbalanced force of gravity on the rocket at blast off What is the unbalanced force on the rocket at blast off
*March 28, 2012 by Isabella*

**Physics **

A constant force of 100N , directed upward, is applied to a 5.0kg toy rocket by the rocket's engine. Find the rockets acceleration? I thought it'd be as simple as F=ma to be 20 m/s2 but I was wrong. What am I overlooking?
*February 15, 2014 by Eiban*

**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 ...
*October 17, 2010 by Haley*

**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 ...
*September 13, 2010 by Jackie*

**physics**

A 425 g model rocket is accelerated upward at 86 m/s2 by its engine. What is the value of the force exerted by the engine on the rocket?
*January 26, 2015 by Rose*

**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 ...
*September 28, 2011 by help*

**Physics**

Pam, wearing a rocket pack, stands on frictionless ice. She has a mass of 44 kg. The rocket supplies a constant force for 22.0 m, and Pam acquires a speed of 62.5 m/s. Assume that air resistance is negligible. (a) What is the magnitude of the force?
*February 18, 2010 by Dar*

**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...
*February 3, 2011 by help*

**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 ...
*October 7, 2008 by tom*

**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 ...
*October 29, 2012 by Matt*

**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 ...
*February 8, 2013 by Kirk*

**physics**

A draft horse exerts a horizontal force of 600 N dragging a log, on which the force of friction is 500 N. The force due to gravity on the log is 700 N and the ground exerts an upward force of 700 N on it. What is the net force acting on the log?
*November 12, 2011 by sebastian*

**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?
*September 24, 2012 by katelin*

**Calculus**

The gravitational force, F, on a rocket at a distance, r, from the center of the earth is given by F=k/r^2 where k = 10^13 newton • km2. When the rocket is 10^4 km from the center of the earth, it is moving away at 0.2 km/sec. How fast is the gravitational force changing at ...
*November 9, 2008 by George*

**Physics**

A rocket with a mass of 345 kg is launched vertically. the engine produces a thrust of 17000 N. Neglect air resistance. a. How would I determine the weight of the rocket? b. What is the net force being applied to the rocket?
*November 23, 2009 by Krista*

**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 ...
*September 19, 2011 by Karina*

**Physics**

A test rocket is launched vertically from ground level (y=0m), 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 97 m and acquired a velocity of 40 m/s. The rocket continues...
*March 26, 2013 by Renay*

**Hard Calculus**

The gravitational force, F, on a rocket at a distance, r, from the center of the earth is given by F=k/r^2 where k = 10^13 newton • km2. When the rocket is 10^4 km from the center of the earth, it is moving away at 0.2 km/sec. How fast is the gravitational force changing at ...
*November 9, 2008 by George*

**Physics**

Pam has a mass of 35.5 kg and she is at rest on smooth, level, frictionless ice. Pam straps on a rocket pack. The rocket supplies a constant force for 29.2 m and Pam acquires a speed of 64.1 m/s. What is the magnitude of the force?
*February 25, 2015 by Andres*

**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 ...
*August 21, 2010 by Anonymous*

**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 ...
*September 19, 2006 by Billie*

**Physics**

A model rocket is launched straight upward with an initial speed of 50 m/s. It accelerates with a constant upward acceleration of 2.00 m/s^2 until its engines stop at an altitude of 150 m. a) What is the max. height reached by the rocket? b) When does the rocket reach max. ...
*September 30, 2007 by Lindsay*

**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 ...
*July 9, 2011 by sand*

**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 ...
*October 7, 2010 by Sam*

**physics**

A 1000kg rocket is moving forward at 10m/s in space. A 10,000N force is applied to the rocket for one second from behind. How fast is the rocket now traveling? a. 0m/s b. 10m/s c. 15m/s d. 20m/s
*November 1, 2011 by Claudia*

**physics**

a rocket is launched from atop a 105-foot cliff with an initial velocity of 156 ft/s.The height of the rocket above the ground at time or t is given by h=-16tsquared+156t+105. When will the rocket hit the ground after it is launched?
*May 24, 2011 by Anonymous*

**physics**

A rocket moves straight upward, starting from rest with an acceleration of +25.5 m/s2. It runs out of fuel at the end of 4.26 s and continues to coast upward, reaching a maximum height before falling back to Earth. (a) Find the rocket's velocity and position at the end of 4.26...
*January 22, 2012 by john *

**physics**

A rocket moves straight upward, starting from rest with an acceleration of +25.5 m/s2. It runs out of fuel at the end of 4.26 s and continues to coast upward, reaching a maximum height before falling back to Earth. (a) Find the rocket's velocity and position at the end of 4.26...
*January 22, 2012 by john *

**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 ...
*September 26, 2013 by D*

**Physics**

I'm comparing the "g-force" of a rocket and a race car. My answer for the race car corresponds to the answer in the book but my answer for the rocket is off by 1. The book says I need to add 1 G because the rocket is going upward. So, instead of my answer of .87 G, the correct...
*March 16, 2009 by KC*

**Physics**

A 6100 kg rocket is set for vertical firing from the ground. If the exhaust speed is 1200 m/s how much gas must be ejected each second if the thrust a) is to equal the magnitude of the gravitaiotnal force on the rocker and b) is to give the rocket an inital upward acceleration...
*February 9, 2007 by sarah*

**physics 20 **

A speed velocity of a a rocket with a mass of 0.25 kg passes from 15 m/s[up] to 40 m/s[up] in 0.60s. calculate the force of the escaped gasses of the rocket. **** that's what i've done, so far data: m = 0.25kg initial velocity = 15 m/s final velocity = 40 m/s time = 0.60s ...
*November 3, 2009 by Adrienne *

**physics 20 **

A speed velocity of a a rocket with a mass of 0.25 kg passes from 15 m/s[up] to 40 m/s[up] in 0.60s. calculate the force of the escaped gasses of the rocket. **** that's what i've done, so far data: m = 0.25kg initial velocity = 15 m/s final velocity = 40 m/s time = 0.60s ...
*November 3, 2009 by Adrienne *

**PreAP Physics**

Pam has a mass of 40Kg and she is at rest on smooth, level, frictionless ice. Pam Straps on a rocket pack. The rocket supplies a constant force for 22m and Pam acquires a speed of 62 m/s. A) What is the magnitude of the force? B) What is Pam's final Kinetic Energy?
*November 30, 2011 by Mandy*

**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 ...
*February 15, 2012 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. ...
*May 25, 2011 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. ...
*September 8, 2011 by Anonymous*

**math**

Please explain to work this: A rocket is launched from atop a 105-foot cliff with an initial velocity of 156ft/s. the height of the rocket above the ground at time t is given by h= -16t^2 + 156t + 105. When will the rocket hit the ground after it is launched? Round to the ...
*April 13, 2012 by Mary*

**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 ...
*September 28, 2007 by Dustin*

**physics**

A 7600 rocket blasts off vertically from the launch pad with a constant upward acceleration of 2.25 and feels no appreciable air resistance. When it has reached a height of 560 , its engines suddenly fail so that the only force acting on it is now gravity.What is the maximum ...
*October 2, 2012 by Anonymous*

**physics**

A 7600 rocket blasts off vertically from the launch pad with a constant upward acceleration of 2.25 and feels no appreciable air resistance. When it has reached a height of 560 , its engines suddenly fail so that the only force acting on it is now gravity.What is the maximum ...
*October 2, 2012 by Anonymous*

**Physics**

A test rocket is fired up from rest. The net acceleration is 20m/s^2 upward and continues for 4.0 seconds, at which time the rocket engines cease firing. What maximum elevation does the rocket reach?
*April 1, 2013 by Kim*

**AlgebraB-2**

1. What is the value of n so that the expression x˛ + 12x + n is a perfect square trinomial? (1 point)6 36 72 144 2. What are the solutions of the equation x2 + 4x = 96? (1 point) 2, –48 –12, 8 –2, 48 12, –8 3. What are the solutions of the equation x2 + 14x = –130? (1 point)2...
*March 19, 2013 by Jennifer W.*

**physics**

A rocket with mass of 60,000 kg is placed on a launching platform verticlly. its engine is started and the rocket gives out gas at rate of 50kgs^-1 with a speed of 5000ms^-1 a) calculate the up trust force caused by the gas. b) can the rocket be launched at this moment?
*January 7, 2015 by saima*

**physics**

A rocket consists of a payload of 4280.0 kg and 1.626 105 · of fuel. Assume that the rocket starts from rest in outer space, accelerates to its final velocity, and then begins its trip. What is the speed at which the propellant must be expelled to make the trip from the Earth ...
*October 11, 2011 by mymi*

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