very quick q! (1 Viewer)

[Sirius Black]

hi does any1 know how to calculate gravitational field strength?

 

[rama_v]

F=Gm₁m₂ / (r²)

 

[rnitya_25]

where G is a constant 6.6x10^-11; m1 and m2 are the masses of the objects and r is the radius.

 

[gordo]

you're doing hsc physics in a month
how can u not know that.

if u mean by use of an experiment and not just a formula, then u can do this:

Construct a pendulum at least one metre long, attached at its top to a support (such as a clamp connected to a retort stand) and with a small mass tied to its lower end to act as the pendulum bob.

Measure the length (l) of your pendulum, from its point of attachment to the centre of mass of its bob.

Pull the pendulum aside and release it so that it starts swinging. Using a stopwatch, begin timing at an extreme of the pendulum’s motion and time ten full swings (one swing = back and forth) of the pendulum. Divide this time by ten to get a value for the average period (T) of the motion. Using this averaging technique tends to minimise random errors.

The period of a pendulum depends upon the length (l) and the value of acceleration due to gravity (g), as described in the following equation:

T = 2.pi.sqrt( l / g )

Rearranging this equation gives an expression that can be used to calculate g.

G = ( 4.pi^2.l ) / T^2

Substitute your values for l and T into this equation to determine a value for g.

 

[香港!]

^
hahaha, i think Sirius Black was trying to ask something else...
i know he\she is very high level, he\she wouldn't ask that=P

 

[rama_v]

hi does any1 know how to calculate gravitational field strength?

Maybe s/he was looking for the fomula g = Gm_planet/r²?