Physics, 24.12.2019 21:31 soccer816

Bird bones have air pockets in them to reduce their weight—this also gives them an average density significantly less than that of the bones of other animals.

suppose an ornithologist weighs a bird bone in air and in water and finds its mass is 45.0 g and its apparent mass when submerged is 3.60 g (the bone is watertight).

(a) what mass of water is displaced?

(b) what is the volume of the bone?

(c) what is its average density?

Answers: 1

Show answers

Answers

Answer from: cynone8254

(a). The mass of displaced water is $41.3\times10^{-3}\ kg$

(b). The volume of the bone is $41.3\times10^{-6}\ m^3$

(c). The average density is 1089.58 kg/m³.

Explanation:

Given that,

Mass of bone in air = 45.0 g

Mass of bone in water = 3.60 g

(a). We need to calculate the mass of displaced water

Using buoyant force

The buoyant force equal to the difference in apparent weight in air and water

$F_{b}=m_{dw}g$

$m_{dw}g=m_{a}g-m_{w}g$

Put the value into the formula

$m_{dw}g=45\times10^{-3}\times9.8-3.60\times10^{-3}\times9.8$

$m_{dw}g=0.405$

$m_{dw}=\dfrac{0.405}{9.8}$

$m_{dw}=0.0413\ kg$

$m_{dw}=41.3\times10^{-3}\ kg$

$m_{dw}=41.3\ g$

(b). We need to calculate the volume of the bone

Using formula of volume

$V_{dw}=\dfrac{m_{dw}}{\rho_{w}}$

We know that,

$V_{dw}=V_{b}$

Put the value into the formula

$V_{dw}=\dfrac{41.3\times10^{-3}}{1000}$

$V_{dw}=41.3\times10^{-6}\ m^3$

(c). We need to calculate the average density

Using formula of density

$\rho_{b}=\dfrac{m_{a}}{V_{b}}$

Put the value into the formula

$\rho_{b}=\dfrac{45.0\times10^{-3}}{41.3\times10^{-6}}$

$\rho_{b}=1089.58\ kg/m^3$

Hence, (a). The mass of displaced water is $41.3\times10^{-3}\ kg$

(b). The volume of the bone is $41.3\times10^{-6}\ m^3$

(c). The average density is 1089.58 kg/m³.

Answer from: Quest

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

Answer from: Quest

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

$f\alpha \frac{dp}{dt}$

⇒ $f= k \frac{dp}{dt}$

here k is the proportionality constant whose value is 1.

$f=\frac{dp}{dt}$

$f= \frac{d[mv]}{dt}$

$f= m\frac{dv}{dt} +v\frac{dm}{dt}$

$f=ma+v\frac{dm}{dt}$ [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

Another question on Physics

Physics, 21.06.2019 21:20

Which of the following explains why it took so long for the public to accept the negative health effects of smoking? a)people were waiting for counter reasons, and those were presented.b)scientists had not completely finalized their results, which took 30 years.c)cigarettes were cheaply available and media channels were very inefficient.d)cigarette manufacturers were trying hard to bring an alternative into the market

Answers: 3

Answer

Physics, 23.06.2019 00:00

Why does a collision with an airbag cause less damage than a collision with a steering wheel

Answers: 1

Answer

Physics, 23.06.2019 00:30

3. which is not a primary color of light? blue red green yellow

Answers: 1

Answer

Physics, 23.06.2019 02:30

Apropagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum.

Answers: 1

Answer

You know the right answer?

Bird bones have air pockets in them to reduce their weight—this also gives them an average density s...

Questions