Top answers

Imagine a probe in space. Argon gas can be fired from the probes fuel tanks to propel the probe. Discuss whether conservation of momentum applies and whether the speed of the probe increases.

With these long answer questions the examiners want to see both the quality of your English and your knowledge of the topic. Typically, this means using key words and phrases. The numbers in the brackets are...
AM
Answered by Aran M. • Physics tutor
2508 Views

Given I climb two steps every second and I have a mass of 50kg, what is the power output of my legs in kilowatts? (3 significant figures)

(There is a diagram showing stairs with steps that are 20cm high) Power = Energy/TimeEnergy required to climb one step = Work Done = Force DistanceForce = Weight = m g = 50 9.81 = 490.5NEnergy = 490.5 0.2 = ...
TG
Answered by Toby G. • Physics tutor
2568 Views

Why does atmospheric pressure drop when altitude increases?

(Question can be sketched with a graph) Firstly, in order to have atmospheric pressure, air molecules must collide with a surface, in this case the face of the Earth. As you gain altitude (height from face o...
HS
Answered by Henry S. • Physics tutor
3964 Views

A block of mass 5kg moving in a straight line at constant speed travels 50 metres in 14 seconds. Calculate the block's momentum.

p = 17.9 kgm/s. p = mv. v = d/t. p = md/t. p = (5 x 50)/14
CW
Answered by Cameron W. • Physics tutor
2523 Views

How do you improve measurements and reduce error in a physics lab experiment?

Repeat measurements and find the average (usually mean) result2) Use a higher precision apparatus3) Zero or recalibrate the instrument to avoid incorrect results
TD
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