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Lyrx [107]
4 years ago
10

Which of the following statements is true about magnetic fields. Magnets and magnetic fields were only just discovered in the la

st 500 years. The earth’s magnetic field is confined within the core of the earth. The earth’s magnetic field protects the surface from strong electrical currents coming from the sun. Magnetic fields are unreliable for use in navigation.
Physics
2 answers:
garik1379 [7]4 years ago
8 0

Answer:

Pushing magma up through the interior of earth

Explanation:

MrRissso [65]4 years ago
7 0

Answer:

is D

Explanation:

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After heating a 10.00 g sample of potassium chlorate, a student obtains an amount of oxygen calculated to be 3.90 g. Theoretical
Vanyuwa [196]

Answer:

0.51 %

Explanation:

Calculated value of the amount of oxygen is 3.9 g

Theoretical value of amount of oxygen is 3.92 g

We need to find the percent error in this experiment. It is given by the difference in theoretical and Calculated value divided by theoretical and multiplying it by 100. So,

E=\dfrac{3.92-3.9}{3.92}\times 100\\\\E=0.51\%

So, the percentage error is 0.51 %.

5 0
3 years ago
Wind blowing across suspended power lines may cause the power lines to vibrate at their natural frequency. This often produces a
Lilit [14]

Answer: D resonance

Explanation: Resonance is the effect produced when an object is forced to vibrate at its natural frequency

7 0
3 years ago
What is the biggest current disadvantage to using gas hydrates as a form of energy?
ohaa [14]
When gas hydrates are brought to the surface, they evaporate quickly. This would be the biggest, current disadvantage to using gas hydrates as a form of energy.
6 0
4 years ago
Read 2 more answers
27. (a) What magnification is produced by a 0.150 cm focal length microscope objective that is 0.155 cm from the object being vi
denpristay [2]

Answer:

magnification = - 30

overall magnification = -240

Explanation:

given data

Focal length of microscope objective f = 0.150 cm

Object distance from microscope objective do = 0.155 cm

magnification by eyepiece = 8 ×

to find out

What magnification is produced  and overall magnification

solution

we consider here  Image distance from microscope objective is =  di

so that

Magnification produced by objective will be = - \frac{di}{do}

so we find here  di by given equation that is

\frac{1}{do} +\frac{1}{di} = \frac{1}{f}     ..................1

\frac{1}{di} = \frac{1}{0.150} - \frac{1}{0.155}

di = 4.65 cm

so that magnification by object will be

magnification = - \frac{di}{do}

magnification = - \frac{4.65}{0.155}

magnification = - 30

and

overall magnification will be

overall magnification = magnification by objective × magnification by eyepiece   ........................2

overall magnification = -30 × 8

overall magnification = -240

7 0
3 years ago
Problem 28.3 Suppose that you are planning a trip in which a spacecraZ is to travel at a constant velocity for exactly six month
iragen [17]

Answer:

v = 0.999981c m/s

Explanation:

Using the time dilation equation

T = \frac{T_{0} }{\sqrt{1 - \frac{v^{2} }{c^{2} } } }

T = stationary time = 100 years

T₀ = 11/12 years = 0.917 years

v = speed of travel in the space = ?

c = speed of light = 3 * 10⁸ m/s

100 = \frac{0.917 }{\sqrt{1 - \frac{v^{2} }{(3*10^{8} )^{2} } } }\\

(0.917/100) ^{2} = 1 - \frac{v^{2} }{ 9 * 10^{16} }

v = 299987395.57 m/s

v = 2.99 * 10⁸ m/s

v = 0.999981c m/s

3 0
3 years ago
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