What type of composition does an igneous rock have that contains mostly plagioclase feldspar and about 30 percent dark silicate
2 answers:
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<h2>The velocity of the boat relative to an observer standing on either bank = u = 18 
</h2>
Explanation:
Let speed of the boat in still water = u
speed of the river water = v
Relative speed of the boat in the water against the river flow is given by
Upstream speed = u - v ------- (1)
⇒ u - v = 12 ------ (2)
Given that speed of the water = 6
Now velocity of the boat is given From equation (2)
⇒ u = 12 + v
Put the value of v = 6 , we get
⇒ u = 12 + 6
⇒ u = 18
therefore , the velocity of the boat relative to an observer standing on either bank = u = 18
Answer:
(we need the mass of the astronaut A)
Explanation:
We can solve this by using the conservation law of the linear momentum P. First we need to represent every mass as a particle. Also we can simplify this system of particles by considering only the astronaut A with an initial speed of 0 m/s and a mass
and the IMAX camera with an initial speed
of 7.5 m/s and a mass
of 15.0 kg.
The law of conservation says that the linear momentum P (the sum of the products between all masses and its speeds) is constant in time. The equation for this is:
By the law of conservation we know that
For (final linear momentum) we need to treat the collision as a plastic one (the two particles stick together after the encounter).
So: