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ankoles [38]
3 years ago
15

Для вимірювання температури води, що має масу 66 г, у неї занурили термометр, який показав температуру 32,4 °С. Якою була дійсна

температура води, якщо теплоємність термометра 1,9 Дж\кг•°с і перед зануренням у воду він показував температуру навколишнього середовища рівну 17,8°С? Питома теплоємність води 4200 Дж\кг•°С
Physics
1 answer:
Aleksandr-060686 [28]3 years ago
4 0

Answer:

я не знаю відповіді

Explanation:

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A disk has a radius of 30 cm and a mass of 0.3 kg and is turning at 3.0 rev/s. A trickle of sand falls onto the disk at a distan
Pani-rosa [81]

Answer:

The mass of the sand that will fall on the disk to decrease the is 0.3375 kg

Explanation:

Moment before = Moment after

I \omega_i = I \omega_f +mr^2 \omega_f\\\\mr^2 \omega_f = I \omega_i  - I \omega_f \\\\m = \frac{ I \omega_i  - I \omega_f}{r^2 \omega_f }

where;

I is moment of inertia = Mr² = 0.3 x (0.3)² = 0.027 kg.m²

substitute this in the above equation;

m = \frac{ 0.027[3(2 \pi)  - 2(2 \pi)]} {0.2^2 * 6\pi } = \frac{ 0.027[6 \pi  - 4\pi]} {0.2^2 * 4\pi }\\\\m = 0.3375kg

Therefore, the mass of the sand that will fall on the disk to decrease the is 0.3375 kg

7 0
3 years ago
What will happen when these two waves interact?
oee [108]
B would be your answer
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3 years ago
What is the acceleration of a body moving with uniform velocity?
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You are an engineer in charge of designing a new generation of elevators for a prospective upgrade to the Empire State Building.
katen-ka-za [31]

Answer:

22.505 seconds

Explanation:

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the minimum time in which an elevator can travel the 373 m from the ground floor is 22.505 seconds.

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