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3 years ago

11

Why do you want the water to drip off the metal before it is placed in the calorimeter?

1 answer:

kipiarov [429]3 years ago

5 0

The metal will no longer give the correct temperature reading if we do not drip off the water before it is placed in the calorimeter.

Explanation:

The calorimeter is a device used to measure the flow of heat from a chemical reaction or a physical change.

A basic calorimeter is consists of a metal container of water above the combustion chamber. The process of measuring heat is called calorimetry.
As soon as the water begins to boil the metal should be placed so that it can obtain a constant flow of thermal energy from the boiling water instead of placing the water in cold water receiving inconsistent temperature.
When you remove the tube with a metal form from boiling water, you hesitate before dumping the metal, the metal will no longer be the temperature of boiling water.

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Answer:

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3 years ago

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Answer:

Case A

Explanation:

given,

size of bacteria = 1 mm x 1 mm

velocity = 20 mm/s

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velocity of swimmer = 3 m/s

Viscous force

$F = \eta A \dfrac{dv}{dx}$

for the bacteria

$F = \eta \times 10^{-6}\times 20\times 10^{-3}$

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for the swimmer

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$F =6.75 \eta\ N$

from the above force calculation

In case B inertial force that represent mass is more than the inertial force in case of bacteria.

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So, In Case A viscous force will be dominant.

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3 years ago

A 0.155 kg arrow is shot upward

solniwko [45]

Answer:

2.43J

Explanation:

Given parameters:

Mass of the arrow = 0.155kg

Velocity = 31.4m /s

Unknown:

Kinetic energy when it leaves the bow = ?

Solution:

The kinetic energy of a body is the energy in motion of the body;

it can be derived using the expression below:

K.E = $\frac{1}{2}$ m v²

m is the mass

v is the velocity

Solve for K.E;

K.E = $\frac{1}{2}$ x 0.155 x 31.4 = 2.43J

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