<span>The relative hardness of a mineral
can be tested by the Moh’s scale or the mineral hardness. The Moh’s scale can
be characterized by the ability of the mineral to resist scratch resistance by
scratching a harder or softer mineral. It has a scale of 1 to 10 where 1 being
the softest and 10 being the hardest. The relative hardness of a mineral can
best be tested by scratching the mineral across a glass plate. The answer is
letter A. </span>
#1
True
All metals attract magnets
#2
Yes true
Away from magnetic field if you place something it won't attract that
#3
False
Its only possible in case of electromagnetic force fields .
#4
False
Electromagnetic force field
#5
True
Answer:
<h3>
</h3>
Explanation:
Given,
Speed of a car = 25 km
<u>Converting </u><u>2</u><u>5</u><u> </u><u>km </u><u>into </u><u>m</u>
<u></u>
<u></u>
Time taken ( t ) = 15 minutes
<u>Converting </u><u>minutes </u><u>into </u><u>seconds</u>
<u>Finding </u><u>the </u><u>speed </u><u>of </u><u>the </u><u>car</u>
Hope I helped!
Best regards!!
I found: 16,905J
Explanation:
The Gravitational Potential Energy will depend on the work done against gravity (weight,
W=mg) to lift it at height h or:
U = mgh =750 * 9.8 *2.3 =16,905J