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Serjik [45]
3 years ago
7

A force is directly proportional to what ?

Physics
1 answer:
pishuonlain [190]3 years ago
4 0
It's mass and acceleration
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A train is moving at a speed of 50 km/h. How many hours will it take thetrain to travel 600 kilometers
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12

Explanation:

600/50 is 12 so the answer is twelve

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If a topographic map included a 6,000 ft. mountain next to an area of low hills, which would best describe the contour lines on
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SCALCET8 3.9.018.MI. A spotlight on the ground shines on a wall 12 m away. If a man 2 m tall walks from the spotlight toward the
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Answer:

The length of his shadow is decreasing at a rate of 1.13 m/s

Explanation:

The ray of light hitting the ground forms a right angled triangle of height H, which is the height of the building and width, D which is the distance of the tip of the shadow from the building.

Also, the height of the man, h which is parallel to H forms a right-angled triangle of width, L which is the length of the shadow.

By similar triangles,

H/D = h/L

L = hD/H

Also, when the man is 4 m from the building, the length of his shadow is L = D - 4

So, D - 4 = hD/H

H(D - 4) = hD

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H = 2 m × 12 m/(12 m - 4 m)

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H = 3 m

Since L = hD/H

and h and H are constant, differentiating L with respect to time, we have

dL/dt = d(hD/H)/dt

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Now dD/dt = velocity(speed) of man = -1.7 m/s ( negative since he is moving towards the building in the negative x - direction)

Since h = 2 m and H = 3 m,

dL/dt = h(dD/dt)/H

dL/dt = 2 m(-1.7 m/s)/3 m

dL/dt = -3.4/3 m/s

dL/dt = -1.13 m/s

So, the length of his shadow is decreasing at a rate of 1.13 m/s

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2 years ago
12 points , just need help with this question
tigry1 [53]

Answer:f 30

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