3 years ago

Chuyển động thẳng đều là gì? Lời giải:

Physics

1 answer:

dlinn [17]3 years ago

8 0

Answer:

very easy question like its exam

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41. City A lies 30 km directly south of city B. A bus, beginning at city A travels 50 km at 37° north of east to reach city C. H

Nana76 [90]

Answer:

B) 40 km West

Explanation:

Let position of B is origin so with respect of City B the position of A is given as

$r_A = 30 km$ south of city B

now Bus starts from City A and travels a distance of 50 km at 37 degree North of East to reach city C

so it is

$r_{CA} = 50(cos37\hat i + sin37 \hat j)$

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now the position of C is given with respect to A

in order to find the position of C with respect to B we can say

$r_C = r_{CA} + r_A$

$r_C = 40\hat i + 30\hat j + (-30 \hat j)$

$r_C = 40 \hat i$

so in order to reach at city B from city C bus has to travel 40 km towards West

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3 years ago

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Dmitrij [34]

Answer:

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Explanation:

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3 years ago

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If you apply the same amount of force to a 0.1-kilogram baseball and a 0.05-kilogram tennis ball, which one will accelerate more

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The tennis ball.

Explanation:

Because the baseball is heavier, it requires more force to move it, whereas the tennis ball requires less force, so it will move more. Hope that makes sense!

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