Home
Class 9
PHYSICS
A ship has two engines, one producing a ...

A ship has two engines, one producing a thrust of 300 newtons and the other 750 newtons . Firing the smaller engine for 10s speeds the ship up from 80 metres per second to 95 meters per second, and the large engine is then fired for 12 seconds. How fast is the ship then going.

Text Solution

Verified by Experts

The two impulses are
impulse 1 `=f Delta t= (300N) times (10s)=3000 Ns`
Impulse 2 `=f Delta t=(750 N) times (12s)=9000Ns`
So the second impulse must produce three times as much change in velocity as the first. The first change was `95m//s -80m//s =15m//s` so the second impulse increases the velocity by 45 metres per second , from 95 meters per second to 140 meters per second.
Promotional Banner

Topper's Solved these Questions

  • FORCE AND LAWS OF MOTION

    MTG IIT JEE FOUNDATION|Exercise EXERCISE (LONG ANSWER TYPE)|9 Videos

  • FORCE AND LAWS OF MOTION

    MTG IIT JEE FOUNDATION|Exercise EXERCISE (INTEGER VALUE TYPE )|5 Videos

  • FORCE AND LAWS OF MOTION

    MTG IIT JEE FOUNDATION|Exercise EXERCISE (VERY SHORT ANSWER QUESTION)|15 Videos

  • FOOTSTEPS TOWARDS NEET

    MTG IIT JEE FOUNDATION|Exercise Multiple Choice Question|45 Videos

  • GRAVITATION

    MTG IIT JEE FOUNDATION|Exercise Olympiad/HOTS Corner|20 Videos

Similar Questions

Explore conceptually related problems

A rocket driven sledge speeds up from 40 metres per second to 55 metres per second in 5.0 seconds, using an engine that produces 3500 newtons of thrust. How much thrust would be needed to get the same increase in speed in 2.0 seconds

A machine gun of mass 10 kg fires 20 g bullets with speed of 500 m/s at the rate of 10 bullets per second. To hold the gun steady in its position how much force is necessary?

Two ideal Carnot engines operate in cascade (all heat given up by one engine is used by the other engine to produce work) between temperatures, T_(1) and T_(2) . The temperature of the hot reservoir of the first engine is T_(1) and the temperature of the cold reservoir of the second engine is T_(2) . T is temperature of the sink of first engine which is also the source for the second engine. How is T related to T_(1) and T_(2) , if both the engines perform equal amount of work?

Each of the two guns, mounted on a rotating platform with their lengths parallel to each other, fires 20 bullets per second at a speed of 50 m s^(-1) . If the perpendicular distance between the two guns is 1.2 m and the mass of each bullet is 25g, find the couple acting on the platform.

A hunter is standing on fiat ground between two vertical cliffs that are directly opposite one another. He is closer to one cliff than to the other. He fires a gun and, after a while, hears three echoes. The second echo arrives 1.6 S after the first, and the third echo arrives 1.1 s after the second. Assuming that the speed of sound is 343 m/s and that there are no reflections of sound from the ground, find the distance between the cliffs.

The drawing shows a ship 800 m from a cliff. A gun is fired on the ship. After 5 seconds the people at the front of the ship hear the sound of the gun again. (a) What is the name of this effect? (b) What happens to the sound at the cliff? (c) How far does the sound travel in 5 seconds? (d) Calculate the speed of sound.

A hunter has a machine gun that can fire 50g bullet with a velocity of 150m//s . A 60kg tiger springs at him with a velocity of 10m//s . How many bullets must the hunter fire per second into the tiger in order to stop him in the track?