4 years ago

PLEASE HELP GOT TO SUBMIT QUICK,,THANKS!

Physics

2 answers:

anastassius [24]4 years ago

4 0

Source magma is the cause of minerals in igneous rocks

Elanso [62]4 years ago

3 0

Igneous rocks come from hardened magma or lava, so the answer is the first choice.

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What is the density of a rock with a mass of 10 grams and a volume of 5 ml

Talja [164]

Density= mass/volume
So the answer is 2g/ml
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3 years ago

A spiral staircase winds up to the top of a tower in an old castle. To measure the height of the tower, a rope is attached to th

boyakko [2]

Answer:

8.76762 m

Explanation:

T = Time period = 5.94 seconds

g = Acceleration due to gravity = 9.81 m/s²

L = Length of pendulum = Height of tower

Time period is given by

$T=2\pi \sqrt{\dfrac{L}{g}}\\\Rightarrow T^2=4\pi^2\dfrac{L}{g}\\\Rightarrow L=\dfrac{T^2g}{4\pi^2}\\\Rightarrow L=\dfrac{5.94^2\times 9.81}{4\pi^2}\\\Rightarrow L=8.76762\ m$

The height of the tower is 8.76762 m

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3 years ago

Calculate the minimum frequency of ultrasound (in Hz) that will allow you to see details as small as 0.193 mm in human tissue. (

STatiana [176]

Answer:

f = 7.97 x 10⁶ Hz = 7.97 MHz

Explanation:

The speed of a wave is given by the following formula:

$v = f\lambda$

where,

v = speed of the ultrasound wave through human tissue = 1540 m/s

f = frequency of ultrasound wave required = ?

λ = wavelength of ultrasound waves = smallest detail required = 0.193 mm

λ = 0.193 mm = 1.93 x 10⁻⁴ m

Therefore,

$1540\ m/s = f(1.93\ x\ 10^{-4}\ m)\\f = \frac{1540\ m/s}{1.93\ x\ 10^{-4}\ m}$

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The force needed is 5250N

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4 years ago

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3 years ago

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