Physics, 22.09.2019 04:50 esmemaluma00

How does jumping into a pool change the amount of gravity acting on you?

Answers: 1

Show answers

Answers

Answer from: KenzieD6032

Because of the buoyant force

Explanation:

Jumping into a pool change the amount of apparent gravity acting on a person.

Normally, for a person in free fall, the weight of the person is given by:

F=mg

where m is the mass of the person and g=9.8 m/s^ is the acceleration due to gravity.

When a person is in the water, there is a buoyant force pushing the person upward. The magnitude of the buoyant force is

$B=\rho_w V g$

where

$\rho_w$ is the density of the water

V is the volume of displaced fluid

g is the acceleration due to gravity

So the net force acting on the person is

$F= mg - \rho_w V g$ (1)

Since V corresponds to the volume of the person, we can rewrite it as

$V=\frac{m}{\rho_p}$

where $\rho_p$ is the density of the person. Substituting into eq.(1),

$F=mg- m \frac{\rho_w}{\rho_p} g = mg - mg'$ (2)

where we called

$g'=\frac{\rho_w}{\rho_p} g$

So we can further rewrite (2) as

F=m(g-g')

so we see that the gravity acting on the person, g, has been modified into (g-g') due to the presence of the buoyant force.

Answer from: Quest

scattering of light by tiny particles in air to produce the colors we see on sky, is dependent on the following factors:

(i) wavelength of light

(ii) size of the scattering particle

(iii) distance traveled by light through the atmosphere.

according to rayleigh's law of scattering, the amount of scattering is inversely proportional to the fourth power of its wavelength. shorter the wavelength, greater is its scattering. hence violet/blue light is scattered more than red.

sun's light is a composite light ( visible light) with wavelengths in the range 400 nm (violet) to 700 nm (red). as sunlight passes through our atmosphere, the molecules of air scatter light according to their wavelengths. during sunrise and sunset, the sun's position is below the horizon. hence light from the sun travels a greater distance in the atmosphere when compared to its position a noon.

as sunlight enters the earth's atmosphere, blue light is scattered away and at the end of its journey in the sky, only red and orange wavelengths remain in the beam.

hence at sunrise and sunset, the sky appears reddish orange.

Answer from: Quest

you get 2.3=1.21*\frac{a}2 or 4.6=1.21a or a=3.802 (b)

explanation:

Other questions on the subject: Physics

Physics, 22.06.2019 13:50, demitae8839

9.98 kg of r-134a at 300 kpa fills a rigid container whose volume is 14 l. determine the temperature and total enthalpy in the container. the container is now heated until the pressure is 600 kpa. determine the temperature and total enthalpy when the heating is completed. use data from the steam tables.

Answers: 1

continue

Physics, 22.06.2019 17:20, shoobywee

You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. when you increase the plate separation, what happens to the following quantities?

Answers: 1

continue

Physics, 22.06.2019 18:30, ayahabdulhaqq2

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?

Answers: 2

continue

Physics, 23.06.2019 08:00, 19thomasar