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2 years ago

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A 4.5 kg box is being pulled by a girl using a string that makes an angle of 20° horizontal. Find the force of friction if the f

orce exerted on the string is 15 N and the coefficient of friction is 0.5.

1 answer:

Mashutka [201]2 years ago

5 0

Answer:

Fcoso-f =ma. F= ma 15 = 4.5 a then get acceleration. Fcoso- umg = ma then get friction

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What amount of heat is required to raise the temperature of 200 g of water by 15°C (the specific heat of water is 1 cal/g°C)

Sergeeva-Olga [200]

Answer:

Heat energy required (Q) = 3,000 J

Explanation:

Find:

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Find:

Heat energy required (Q) = ?

Computation:

Q = M × ΔT × C

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Heat energy required (Q) = 200 g × 15°C × 1 cal/g°C

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3 years ago

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3 years ago

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Explanation:

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(a) Then the momentum of each vehicle can be obtained by the product of mass with their respective speed.

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Similarly, the momentum of car will be

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The direction of the vehicles after collision will be towards south as the mass and speed of the truck is greater than car. So the impact or force exerted on the car by the truck will be greater and thus both the vehicles will be directed towards south after collision.

Thus, the size of momentum is 93500 kgm/s and it will be directed towards South.

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3 years ago

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sergiy2304 [10]

Answer:

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