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Physics
A Level

What is natural frequency and how is it associated with resonance?

When anything is hit it will vibrate at the same frequency regardless of the force that hits it. This frequency of un-damped oscillations is the natural frequency. And every object/system has its own set ...

HM
Answered by Henry M. Physics tutor
11302 Views

How can an object be accelerating when it's velocity is constant, and how does centripetal acceleration work.

Although an object in circular motion travelling at constant velocity isn't accelerating in the conventional sense, ie. changing speed, it's important to remember that it is a vector. Vector quantities ha...

TG
Answered by Tom G. Physics tutor
3293 Views

Derive Keplers 3rd law

Equate gravitational force (GMm/r^2) to centripetal force (mv^2/r). Rearrange to get v^2=GM/r. Due to the approximated circular orbit v=2pir/T so v^2=4pi^2r^2/T^2. Therefore GM/r=4pi^2r^2/T^2. Rearrangin...

MS
Answered by Michael S. Physics tutor
4164 Views

A projectile is fired at an angle of 30 degrees from the horizontal, it reaches a maximum height of 12m above the ground before coming to rest 600m from its initial starting point at the same level. What is the initial speed of the projectile?

At first glance this question seems require solving in several steps, splitting horizontal and vertical components, taking a value for time from the motion under constant acceleration and then applying th...

JS
Answered by Joseph S. Physics tutor
8864 Views

A geostationary satellite is orbiting Earth, a) What is meant by a geostationary orbit? b) Calculate the height at which the satellite orbits above the surface of the Earth. The radius of the Earth is 6400km and its mass is 6x10^24 kg.

a) A geostationary orbit is when the satellite remains vertically above the same point on the equator at all all times and consequently has an orbital period of 24 hours. b) Use the equation T^2=4(PI)^2(r...

EN
Answered by Edward N. Physics tutor
20271 Views

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