Answer:
a) v_Nort = 2.236 m / s
, θ = 56.3º, b) t= 53.76 s
Explanation:
This exercise should use the addition of vectors, we have a kayak speed of v₁ = 3 m / s and an eastward speed of water v₂ = 2.0 m / s.
They ask us to cross the river that is to the north, we see that the speed of the kayak is the hypotenuse of the triangula, see attached
v₁² = v_nort² + v₂²
v _nort² = v₁² –v₂²
v_nort = √ (3² - 2²)
v_Nort = 2.236 m / s
For the angle we can use trigonometry
tan θ = v₂ / v₁
θ = tan⁻¹ v₂ / v₁
θ = tan⁻¹ 2/3
θ = 33.7º
This angle measured from the positive side of the x axis is
θ = 90 - 33.7
θ = 56.3º
b) we look for the northward component of this speed
sin 56.3 = 
/ v_nort
v_{y} = v_nort sin 56.3
v_{y} = 2.236 sin 56.3
v_{y} = 1.86 m/s
The time is
v_{y} = y/t
t = y/v_{y}
t =100/ 1.86
t= 53.76 s
Scientists can show creativity by constantly coming up with new ideas and theories to test. There is always something new to think about and scientists can use their imagination in order to create something new and original that the world needs.
I think it will go down like decrease minus or whatever you call it
B. carbon + oxygen -- carbon dioxide
Explanation:
The best equation that describes a reaction where carbon combines by burning in the presence of oxygen to produce carbon dioxide is:
carbon + oxygen -- carbon dioxide
Every chemical reaction is made up of reactants and products
Reactants are the species on the left hand side of an equation, the products are those on the right hand side.
The reactants combines chemically to give produces.
The kind of reaction depicted above is a synthesis or combination reaction where two species combines to gives a product or more;
C + O₂ → CO₂
learn more:
Chemical reaction brainly.com/question/3953793
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