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Iteru [2.4K]
4 years ago
9

For the vectors and , give in (a) unit-vector notation, and as (b) a magnitude and (c) an angle (relative to in the range of (-1

80°, 180°]). Now give in (d) unit-vector notation, and as (e) a magnitude and (f) an angle (relative to in the range of (-180°, 180°])
Physics
1 answer:
stealth61 [152]4 years ago
8 0

Answer: a

Explanation:

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It is proposed that a spaceship might be propelled in the solar system by radiation pressure, using a large sail made of foil. W
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Answer:

962291.57928 m²

Explanation:

P_r = Pressure = 2\dfrac{I}{c}  (full reflection)

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P = Power = 3.9\times 10^{26}\ W

c = Speed of light = 3\times 10^8\ m/s

M = Mass of Sun = 1.99\times 10^{30}\ kg

m = Mass of ship = 1500 kg

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Force of radiation is given by

F_r=P_rA\\\Rightarrow F_r=2\dfrac{I}{c}\times A\\\Rightarrow F_r=2\dfrac{P}{4\pi r^2c} A

This force will balance the gravitational force as stated in the question

\dfrac{GMm}{r^2}=2\dfrac{P}{4\pi r^2c} A\\\Rightarrow A=\dfrac{4\pi cGMm}{2P}\\\Rightarrow A=\dfrac{4\times \pi\times 3\times 10^8\times 6.67\times 10^{-11}\times 1.99\times 10^{30}\times 1500}{2\times 3.9\times 10^{26}}\\\Rightarrow A=962291.57928\ m^2

The area of the must be 962291.57928 m²

3 0
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Which group of theorists believe that we should study only what we can directly observe and measure?
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Learning Through Observation

Albert Bandura believed that associations and direct reinforcements simply could not account for all learning. "Learning would be exceedingly laborious, not to mention hazardous if people had to rely solely on the effects of their own actions to inform them what to do," he famously wrote in his 1977 book Social Learning Theory.

Instead, he proposed that much of learning takes place through observation. Children observe the actions of those around them, particularly caregivers and siblings, and then imitate these behaviors. In his well-known Bobo doll experiment, Bandura revealed just how easily children could be led to imitate even negative actions. Children who watched a video of an adult beating up a large inflatable doll were then much more likely to copy those same actions when given a chance.

Perhaps most importantly, Bandura noted that learning something does not necessarily result in a change in behavior. Children frequently learning new things through observation, but might not engage in such behaviors themselves until there is actually a need or motivation to utilize the information.

hope it helps you

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2 years ago
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IrinaVladis [17]

Answer:

9) c

10) c

11) d

12) d

Explanation:

I think it's helps you

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Answer:

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