This aeroplane has an electric motor powered by fuel cells. Fuel cells use hydrogen gas and provide an electric current.
(a) When the aeroplane is working, the energy changes are
ZA chemical - electrical - kinetic
2 B electrical --> chemical - kinetic
DC electrical kinetic chemical
D kinetic - Chemical electrical

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.

Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?