stars begin as a giant cloud of gas which is also a protostar. gravity will pull the gas in on intelf which increases heat and pressure to such great quantities …
Terminal velocity is the maximum velocity (a vector quantity that accounts for speed and direction) that can be attained by a falling object of a certain surface area. Objects accelerate …
The first thing to recognise is that the terms 'sugar' and 'electrical' are there to confuse you - the substance raised and the type of form of energy used to …
It is composed of Protons, Neutrons and Electrons.The Proton is positively charged and is present in the central nucleus part of the atom.The Neutron has no charge and also …
Using Hooke's law (F = k * e) we can find the spring constant. Rearranging for k, we find that k = (9.81 * 2)/0.02 = 981 N/m. To calculate …
The key to this question is realising that the action and corresponding reaction refer to forces that act on different objects. When I push the box, I exert a …
Speed is the rate of change in direction, whereas velocity is the rate of change in displacement. This means that an object's velocity has an associated direction whereas its speed …
One method to measure the speed of sound would require two people, a large open space, a starting pistol that produces smoke instantaneously when fired, a stopwatch and a tool …
Nebula (cloud of gas and dust)ProtostarMain sequence starRed giantWhite dwarfBlack dwarf (some students may not need to know this depending on their GCSE exam board and specification)
Velocity is a vector quantity, that is, it is fully described by magnitude and direction. Even though the car moves at a constant speed, its direction varies as it moves …
Ultrasound is not ionising as it is a longitudinal wave whilst X-rays are ionising as they are transverse waves and have very high frequency hence can 'knock' electrons out of …
The Rutherford experiment allowed us to experimentally disprove older models of the atom, forming the basis of the evidence for the nuclear model of the atom. The atom at the …
Divide pressure by temperature to get the constant = 1150. Making sure all values are in the correct units.Then multiply by 300K to get the increased pressure. 3.45 x 10^5 …
Speed and Velocity are both measures of distance travelled in a given time and are therefore calculated using Speed=Distance/Time.Speed is a scalar quantity which means that it is quantified by …
Newton's 3rd law, simply put, is every action has an equal and opposite reaction. This means when you push on an object the object experiences a force (from you) and …
a) Smoke detector- americiumb) As alpha radiation is not very penetrating
Thermal conduction is one of three types of heat transfer. It occurs when 2 objects are in contact and have a difference in temperature. The kinetic energy is passed on …
Red-shift describes the phenomenon whereby the wavelength of light from a source increases as it travels through spacetime, hence observed as being 'shifted' to the red end of the spectrum …
Light travels as waves which have a distinct set of properties: a speed, a frequency and a wavelength. These properties are related to each other through the following equation: speed …
The equation linking Power, Time, and Energy is:P=W/tAnd here P= 200 W, and t= 1800 sHence, W= 200*1800 = 360,000 JNB: Remember here, the SI units are important.