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2 years ago

Short Answer Questions:

1 answer:

4 0

According to Archimede's principle, a physical object experiences an upthrust due to a difference in pressure between upper and lower surfaces.

<h3>What is an upthrust?</h3>

An upthrust is also referred to as buoyancy and it can be defined as an upward force which is exerted by a fluid (liquid or gas), so as to oppose the weight of a partially or fully immersed physical object that is floating in it.

Based on scientific information, a physical object experiences an upthrust when it is immersed in a fluid due to a difference in height and pressure between upper (top) and lower (bottom) surfaces.

According to Archimede's principle, there is a higher pressure at the bottom of the physical object due to height, and a lower pressure at the top of the physical object.

Read more on upthrust here: brainly.com/question/24389514

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A culture is a group of people that share the same __________.

Nookie1986 [14]

Hi!

Although all of them might be a good answer the correct has to be <span>C. beliefs and behaviors </span>

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3 years ago

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Lillian (mass 40.0 kg) standing at rest on slippery ice catches her leaping dog (mass 15 kg) moving horizontally at 3.0 m/s. Wha

mestny [16]

Answer:

0.82 m/s

Explanation:

From the law of conservation of momentum,

Total momentum = Final momentum.

mu+m'u' = V(m+m')......................... equation 1

Where m = mass of Lillian, u = initial velocity of Lillian before she catches the dog, m' = mass of the dog, u' = initial velocity of the dog, V = velocity of Lillian and the dog.

make V the subject of the equation,

V = (mu+m'u')/(m+m')................ Equation 2

Given: m = 40 kg, m' = 15 kg, u = 0 m/s (Lillian was standing at rest), u' = 3.0 m/s.

Substitute into equation 2

V = (40×0+15×3)/(40+15)

V = (0+45)/55

V = 45/55

V = 0.82 m/s

3 0

4 years ago

The man is walking with speed v1 = 1.35 m/s to the right when he trips over a small floor discontinuity. Estimate his angular ve

soldier1979 [14.2K]

Answer:

The angular velocity, $\omega = 1.05 rad/s$ clockwise

Explanation:

The mass of the man, m = 72 kg

The center of mass of the man will be at the middle of his body, particularly around his abdomen.

Height of the center of mass, h = 0.71 m

The speed of the man, v₁ = 1.35 m/s

Moment of inertia about the ankle joint, I = 66 kg/m²

Based on the principle of conservation of angular momentum (about the ankle joint):

Angular momentum before impact = Angular momentum after impact

Angular momentum before impact = -mv₁h

Angular momentum before impact = -(72 * 1.35 * 0.71)

Angular momentum before impact = -69.012 kg m²/s...............(1)

Angular momentum after impact = $I \omega$

Angular momentum after impact = $66 * \omega$ .................(2)

$66 \omega = -69.012\\\omega = -69.012/66\\\omega = -1.05 rad/s$

The angular velocity, $\omega = 1.05 rad/s$ clockwise

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3 years ago

The closure temperature represents the point when ________. A. a magma cools to the point where minerals begin to crystallize B.

melomori [17]

The closure temperature represents the point when isotopes are no longer free to move out of a crystal lattice.

Answer: Option C

<u>Explanation:</u>

The closure temperature can also be termed as blocking temperature. It is mostly used in radiometric dating. As the temperature decreases, below a certain point the isotopes may get freeze in their lattice positions. And there may be slowing of diffusion.

At the closure temperature, that rate of diffusion will be zero as the isotopes will be no longer free to move out of crystal lattice. So, this is termed as closure or blocking temperature. As the isotopes loose their ability to move, their concentration will remain fixed in their position leading to measurement of radiation dating.

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3 years ago

a 2.4*10^2 N force is pulling an 85 kg refrigerator across a horizontal surface. the force acts at an angle of 20.0 above the su

shepuryov [24]

Answer:

a) The work done by pulling force, W = 1804.21 joules

b) The work done by the kinetic frictional force is, w = 1332.8 J

Explanation:

Given,

The pulling force, Fₐ = 2.4 x 10² newton

The mass of the refrigerator, m = 85 Kg

The angle of pulling force acting to the surface, ∅ = 20°

The coefficient of kinetic friction is, μₓ = 0.200

The distance covered by the refrigerator, s = 8 m

The force acting in the direction parallel to the surface is given by

F = Fₐ cos∅

∴ F = 2.4 x 10² x cos 20°

=225.53 N

The work done by the pulling force is given by

W = F · S

= 225.53 N x 8 m

= 1804.21 joules

The work done by the pulling force, W = 1804.21 joules

The kinetic friction force is given by the formula

Fₓ = μₓ · η

Where

μₓ - coeficient of kinetic frictoin

η - Normal force, (mg)

∴ Fₓ = 0.200 x 85 x 9.8

= 166.6 N

The work done by the kinetic frictional force is given by

w = Fₓ · S

= 166.6 N x 8 m

= 1332.8 J

Hence, the work done by the kinetic frictional force is, w = 1332.8 J

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3 years ago

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