# physics

A rocket engine uses fuel and oxidizer in a reaction that produces gas particles having a velocity of 1380 ms-1. The desired thrust is to be 195000 N.

1-What must be the fuel/oxidizer consumption rate (in kg s-1)?

2-f the initial weight of the rocket is 125000 N, what is its initial acceleration?

3-What are the weight and acceleration of the rocket at t = 15.0 s after ignition?

4-What are the weight and acceleration of the rocket at t = 20.0 s after ignition?

Please help all my classmates doesn't know how to solve this and its due tomorrow *face crying*

1. 👍 0
2. 👎 0
3. 👁 942
1. force=massfuelrate*velocity
massfuelrate= forcedesired/velocty

Initial,it has to operate against gravity.

Thrust=mg+ma=m(9.8+a)
solve for a. mass=initialweight/9.8

3. figure the mass lost in 15 sec(massrate*time)
then do 2 over with the new weight

3.same thing again.

1. 👍 0
2. 👎 8
👨‍🏫
bobpursley

## Similar Questions

1. ### Chemistry

5 orange gas particles 6 blue gas particles 3 green molecules of gas (two particles attached together) If the partial pressure of the diatomic gas is 0.390 atm, what is the total pressure?

2. ### 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

3. ### chemistry

Question: Consider this molecular-level representation of a gas. There are: 5 orange gas particles 6 blue gas particles 3 green molecules of gas (two particles attached together) If the partial pressure of the diatomic gas is

4. ### 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?

1. ### Physics

A 1.8×104 kg rocket has a rocket motor that generates 2.8×105 N of thrust. What is the rocket's initial upward acceleration? At an altitude of 5000 m the rocket's acceleration has increased to 6.3 m/s2 . What mass of fuel has it

2. ### Physics

A 10.2 kg weather rocket generates a thrust of 200N. The rocket, pointing upward, is clamped to the top of a vertical spring. The bottom of the spring, whose spring constant is 500N/m, is anchored to the ground. a) Initially

3. ### Physics

a rocket of mass 1000kg containing a propellant gas of 3000kg is to be launched vertically. If the fuel is consumed at a steady rate of 60kg per seconds, calculate the least velocity of the exhaust gas if the rocket and content

4. ### 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

1. ### chemistry

A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected? A. The engine will get better gas mileage as less fuel is burned during each cycle. B. There will be fewer pollutants as the

2. ### physics

A rocket engine consumes 450 kg of fuel per minute. If the exhaust speed of the ejected fuel is 5.2 km/s, what is the thrust of the rocket?

3. ### 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

4. ### Physics

A model rocket is launched from rest with an upward acceleration of 6.30 m/s2 and, due to a strong wind, a horizontal acceleration of 1.50 m/s2. How far is the rocket from the launch pad 5.30 s later when the rocket engine runs