Energy and amont left after half equation Flashcards
the energy in the nuclear store can be released by
radioactive decay
The internal store of energy is the sum of
the kinetic energy stored in the particles of an object and the chemical energy stored in chemical bonds between particles in the object
The main stores of energy are
Kinetic
Gravitational potential
Chemical
Elastic potential
Nuclear
Internal
Magnetic
Electrostatic
increasing a body’s temperature increases the…
the energy in its internal store
elastic potential energy=
1/2×spring constant×extension 2
Energy transferred from one object to another via a force is an example of
mechanical work.
what is Electrical work
An electrical current transfers energy from one object to another.
what is Mechanical
work
Energy transferred from one object to another via a force.
More work is done if you…
-push with the same force for a longer distance.
-push with a larger force for the same distance.
Work done =
force x distance
energy=
potential difference×current×time
energy=
power×time
power=
work done/time
Efficiency =
(useful power output/total power input) x 100
Power (watts, W) =
work done (joules, J) ÷ time (seconds, s)
The higher the thermal conductivity of a material the
higher the rate of energy transfer by conduction across the material.
how big is a atom’s radius?
1 × 10-10 metres.
The radius of a nucleus is less than ———– of the radius of an atom.
1/10 000
When atoms emit electromagnetic radiation
electrons can drop to a lower energy level, closer to the nucleus
When atoms absorb electromagnetic radiation,
electrons move to a higher energy level further away from the nucleus.
Why would the alpha particles be deflected by a smaller angle if the thin metal foil was made of a lighter element?
The nuclei of lighter elements contain fewer protons. This means they have a lower charge. Each alpha particle will, therefore, experience a smaller electric force acting on it and so deflect by a smaller angle.
density kg/m3=
mass(kg)/volume(m3)
The specific heat capacity of a substance is the amount of
energy needed to increase the temperature of 1 kg of that substance by 1°C.
thermal capacity=
mass×specific heat capacity
