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Alex73 [517]
3 years ago
7

Một nười thả 420g chì ở nhiệt độ 100°C và 260g nước ở nhiệt độ 58°C làm cho nước nóng lên tới 60°C . Cho nhiệt dung riêng của nư

ớc là 4200J/kg.K và bảo qua sự hao phí nhiệt ra môi trường bên ngoài . Hãy tính :
a) Nhiệt độ của chì khi có cân bằng nhiệt

b) Nhiệt lượng nước đã thu vào

c) Nhiệt dung riêng của chì

d) Nếu muốn nước và chì nóng tới nhiệt độ 75°C thì cần thêm vào một lượng chì ở nhiệt độ 150°C là bao nhiêu ?
Physics
1 answer:
vlabodo [156]3 years ago
6 0
Hey what language is this?
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An unknown substance has a mass of 15 g and a volume of 4 cm3. Calculate the density of the unknown substance.
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Answer:

Density is 3.75g/cm3

Explanation:

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What's an adjective to describe Isaac Newton?
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A 95 N force exerted at the end of a 0.50 m long torque wrench gives rise to a torque of 15 N · m. What is the angle (assumed to
o-na [289]

Answer:

angle = 18.40 degree

Explanation:

given data

force = 95 N

distance = 0.50 m

torque = 15 N · m

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solution

we will apply here torque equation that is express as

torque =  distance × force × sin(θ)   ...................1

put here value we will get angle that is

15 = 0.50 × 95 × sin(θ)

sin(θ) = 0.315789

θ = 18.40 degree

6 0
3 years ago
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Investigators should collect virtually everything from a crime scene. True or false?
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An athlete does one push-up period in the process, she moves half of her body weight, 250 N, a distance of 20 cm, this distance
ioda
In the push-up, the athlete's weight  (or force) of 250 N moves through a distance of 20 cm.

By definition,
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Therefore, work done in one push-up is
W=(250 \, N)*(20 \, cm)*(10^{-2} \,  \frac{cm}{m}) = 50 \, J

Note that 1 J = 1  N-m.

Answer:  1 J
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4 years ago
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