Answer:
1281.4 J
Explanation:
F = 298 N
d = 4.3 m
the work done is defined as the product of force applied in the direction of displacement and the displacement.
W = force x displacement
Work is a scalar quantity and its SI unit is Joule.
W = F x d
W = 298 x 4.3 = 1281.4 J
I answered this question the answer is about 4039200
Answer:
first point at which the image focuses will be closer
Explanation:
given data
converging lens = 10 cm
converging lens = 5 cm
lens = 5 cm
to find out
would the first point at which the image focuses be closer or farther
solution
we apply here lens formula that is
1/f = 1/u + 1/v ......................1
so here
v = f × u / u - f
so here for f = 10 cm v will be
v = 10u / u-10 ..........................2
and
for f = 5 cm v will be
v = 5u / u-5 . ........................3
now if we compare equation 2 and 3 we can say that
v for f = 5 cm is greater than v for f = 10 cm
so here first point at which the image focuses will be closer
Answer:
Explanation:
In 1789, Antoine Lavoisier published a list of 33 chemical elements. Although Lavoisier grouped the elements into gases, metals, non-metals, and earths, chemists spent the following century searching for a more precise classification scheme. In 1829, Johann Wolfgang Döbereiner observed that many of the elements could be grouped into triads (groups of three) based on their chemical properties. Lithium, sodium, and potassium, for example, were grouped together as being soft, reactive metals. Döbereiner also observed that, when arranged by atomic weight, the second member of each triad was roughly the average of the first and the third.[19] This became known as the Law of Triads.[20] German chemist Leopold Gmelin worked with this system, and by 1843 he had identified ten triads, three groups of four, and one group of five. Jean Baptiste Dumas published work in 1857 describing relationships between various groups of metals. Although various chemists were able to identify relationships between small groups of elements, they had yet to build one scheme that encompassed them all.[19]
She feel warm due to sun shining on her back which shows the transfer of energy due to Radiation Mode of heat transfer.
Because in this case we do not need any medium to transfer the heat and all energy is transferred due to electromagnetic waves.
She feels warm sand under her feet which shows the heat transfer due to conduction mode.
Because in this mode of heat transfer the heat is transmitted by direct contact.
A cool breeze is blowing from the water which shows the heat transfer due to convection mode.
Here thermal energy is being transferred by the moving medium molecules.