A model rocket is made up of a shuttle of mass 20 kg, and a fuel tank which has a mass of 4 kg when it is empty. When the rocket attains an upward
velocity of 10 ms, all of its fuel is used up. At this point, the empty tank is
fired downwards at a velocity of 5 ms. This causes the rocket to increase its
upward velocity to 13 ms Calculate the change in momentum of:
a) the rocket without empty fuel tank (60 kg m s'upward)
b) the empty fuel tank. (60 kg m s' downward)
Explain why the velocity of a rocket increases when a fuel tank is fired
downwards​

Mass (kg) force (n) 5 25 10 50 15 75 20 100 a student was trying to find the relationship between mass and force. he placed four different masses on a table and pulled them using a spring scale. the table shows the different masses used in the experiment and the force required to pull each mass. the student concluded that more force was required to pull heavier objects. what comment would you make regarding his conclusion? a) no clear relation can be observed between mass and force from the data. b) there is a direct proportion between the mass and force listed in the table. c) gravity should have been taken into account while performing the experiment. d) there is an inverse proportion between the mass and force listed in the table.

Diamond will scratch quartz. true or false

Identify some abiotic characteristics of the tundra biome.