Answer:
(i) Relative velocity of B w.r.t A= Sum of speeds of trains
=54+90
=144kmph
(ii)Relative velocity of B w.r.t Ground(G)=v
B/G
=−90kmph
v
G
=0
Relative velocity of ground(G) w.r.t B =v
G/B
=v
G
−v
B/G
v
G/B
=0−(−90)
v
G/B
=90kmph
The correct answer is: <span>X, W, Y, Z
In fact, the elastic potential energy of a spring is given by
</span>
<span>where k is the spring constant and x is the stretching of the spring with respect to its rest position.
In this problem, all the four springs are stretched by the same distance x. This means that their difference in potential energy is due only to the difference between their spring constant: the larger the spring constant, the greater the energy. Therefore we can list the springs from the one with largest spring constant to the one with smallest constant, and this list corresponds to listing the springs from the one with largest energy to the one with smallest energy:
X, W, Y, Z</span>
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:
Fan speed
Explanation:
because is the dependent variable