Top answers

Describe the process of the big bang

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 create larger elements. Depending...
ZX
Answered by Zieger X. • Physics tutor
2491 Views

Explain in terms of specific heat capacity why a hot water bottle is good at heating a bed.

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 temperature and is in surroundings at a lower...
JL
Answered by Jessica L. • Physics tutor
11682 Views

Draw a freebody diagram showing the forces acting on a box sat on a table

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 on it. Every object on the earth feels a force downwards due to...
RS
Answered by Robin S. • Physics tutor
3605 Views

(A-level but box won't let me change it from GCSE) A particle of charge q and initial speed v is stopped by a potential difference V in distance d and time t. What was its initial momentum?

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 = V/d - definition of electric field o...
GT
Answered by Greta T. • Physics tutor
3133 Views

A car travelling at 14 m/s has to make an emergency stop so applies the brakes and it takes 1.5s to become stationary. What distance has the van travelled in that time?

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 = 10.5m u = the starting v...
CJ
Answered by Caitlin J. • Physics tutor
2780 Views