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2 years ago

A girl runs once around a circular track with a radius of 100m at speed of 10m/s.

Physics

1 answer:

goblinko [34]2 years ago

5 0

Answer:

0 m

Explanation:

Displacement is the shortest distance from one ppont to another. Here, the girl returns to the same spot after running. Hence, displacement is 0 m.

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A tissue sample at 275 K is submerged in 2 kg of liquid nitrogen at 70 K for cryopreservation. The final temperature of the nitr

kirill115 [55]

Answer:

The heat capacity of a sample is 37.7 J/K.

Explanation:

Given that,

Submerged temperature of tissue sample = 275 K

Mass of liquid nitrogen= 2 kg

Temperature = 70 K

Final temperature = 75 K

We need to calculate the heat

Using formula of heat

$Q=mc(T_{f}-T_{i})$

Put the value into the formula

$Q=2\times1.039\times10^{3}\times(75-70)$

$Q=10390\ J$

We need to calculate the heat capacity of a sample

Using formula of heat capacity

$\Delta S=\dfrac{Q}{T}$

Put the value into the formula

$\Delta S=\dfrac{10390}{275}$

$\Delta S=37.7\ J/K$

Hence, The heat capacity of a sample is 37.7 J/K.

7 0

3 years ago

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Two light bulbs are installed in two sockets, the sockets are connected in series, and power is then applied to the combination

Arisa [49]

Answer:

False

Explanation:

If one of the bulbs is removed from the series, the other bulb will not come on at all.

This is because the removal of one of the bulbs would interrupt the flow of current though the entire circuit.

Hence, that the other one will get brighter if one of two bulbs in a circuit is removed from its socket is not true.

5 0

3 years ago

Which two phrases best describe cells?

guapka [62]

<h3>Answer;</h3>

Make up tissues
The simplest level of organization of life

<h3>Explanation;</h3>

Cells are the smallest part of an organism that can carry out all of life functions. They are the basic functional unit of all living organisms.
According to cell theory all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells
A group of cells make up tissues. Tissues are a group of cells that are specialized to carry out specific functions in plants and animal bodies.

3 0

3 years ago

lonic bonds are strong enough to cause all ionic compounds to be ___________ at room temperature. Plz help i need this

Mice21 [21]

Answer:

because ionic bonds are strong, a lot of energy is needed to break them. They are all solids at room temperature.

Explanation:

3 0

3 years ago

Someone help me pls I will give brainlist

sergeinik [125]

Answer:

the answer is point no. a °C , c. K and d. °F

6 0

3 years ago

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