Power is the rate at which energy is transferred. For example, a typical kettle may use 1.2 kiloWatts (kW) for about 2 minutes to boil water. This means that the …
KE = 1/2mv^2m = 588/9.8 = 60 kgv = 8 miles/hr = 3.56 m/sKE = 379 JP = E/tt = d/v = 10m/3.56m/s = 2.81 sP = 135 …
On the flat straight road, the cyclist will travel at a constant speed if the work done by the cyclist is equal to the sum of the energy lost to …
I=Q/t=2400/200=12AP=IV=I^2R=12^2*6=864WOf course, when discussing the answer with a student I would verbally explain each step in detail and add more drawings to my workings. Unfortunately, I cannot …
The air is heated by the coal fire. This causes the air to expand as the molecules move further apart. As a result the air becomes less dense. The less …
Imagine we have a wave that is travelling from left to right. This is the wave's direction of motion, or what is sometimes called the direction of "energy propagation". In …
When we see light, the colour of light that we see is determined by the wavelength of the light. Violet light has the shortest wavelength, and red light has the …
I would most likely present a figure of a dilated & undilated pupal and hopefully this will begin their thought process.To receive full marks for this answer, I will …
Maximum speed is lower This is because maximum power output of cyclist is constant but additional work is done against gravityGravitational potential energy of the cyclist is increasedPower in = …
*Circuit diagram showing a battery, filament lamp, ammeter and variable resistor connected in series, with a voltmeter connected in parallel with the filament lamp.*The resistance of the variable resistor should …
Assuming constant deceleration we can use the equation s = t(u+v)/2, where u=14m/s, v=0m/s and t=4s. Inputting these values we have that the distance travelled s = 1.5(14)/2 = 21/2 …
Define p=momentum, E=electric field.Firstly we know that:1) ∆p/∆t = F - definition of momentum2) F = Eq - force on particle in an electric field caused by a voltage3) E …
The first thing to note is that the book is sat on the table, so it is stationary. From newtons laws, we know it must have 0 total force acting …
Water has a very high specific heat capacity, it is fair to assume bed-sheets and bedding items have a much lower specific heat capacity. If an object has a high …
A cluster of dust collapse under gravity. A protostar is then formed. The protostar starts fusing in Hydrogen to become a main sequence star. The star then fuses Hydrogen to …
To answer this question, we will need the following equation: SPEED = DISTANCE/TIME (A multiplication and division triangle will be shown)i) The speed of the car is calculated by doing …
Sometimes, but definitely not always! Note: it's all dependent on which direction has been assigned '+'. Acceleration is a vector quantity, (the rate of change of velocity), meaning it …
Work done = force x distance moved
Work done = 13 N x 110 m
Work done = 1430 J
Initial energy (Gravitational Potential): E = mgh = 0.5 x 9.81 x 2 = 9.81J Final energy (Kinetic): E = mv2/2 = (0.5 x 52)/2 = …
Energy required calculated using the equation for specific heat capacity: mcdT = dE where m is mass, c is specific heat capacity and dT is the change in …