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3 years ago

Can someone help me and give me the right answer

Physics

1 answer:

olasank [31]3 years ago

5 0

Relative to the movement of the building, a mass damper on the roof of an earthquake resistant building move in the opposite direction. The correct option is C.

<h3>What is mass damper?</h3>

Mass dampers absorbs the kinetic energy of the waves, converting them into the heat energy. This heat energy is dissipated to the hydraulic fluid.

The mass dampers used on roof of the buildings are called as the tuned mass dampers. They are also known as seismic dampers. When seismic wave strikes the building, it vibrates and sways. The kinetic energy of theses waves are absorbed by movement of the mass damper. The kinetic energy is converted to the heat energy which in turn is transmitted to the fluid.

Relative to the movement of the building, a mass damper on the roof of an earthquake resistant building move in the opposite direction.

Thus, the correct option is C.

Learn more about mass dampers.

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The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particl

Lyrx [107]

Answer:

a) F = 21.16 N, b) a = 3.17 10²⁸ m / s

Explanation:

a) The outside between the alpha particles is the electric force, given by Coulomb's law

F = $k \frac{ q_1 q_2}{r^2}$

in that case the two charges are of equal magnitude

q₁ = q₂ = 2q

let's calculate

F = $9 \ 10^9 \ \frac{ (2 \ 1.6 \ 10^{-19} )^2 }{ (6.60 \ 10^{-15} )^2 }$

F = 21.16 N

this force is repulsive because the charges are of the same sign

b) what is the initial acceleration

F = ma

a = F / m

a = $\frac{21.16}{4.0026 \ 1.67 \ 10^{-27} }$ 21.16 / 4.0025 1.67 10-27

a = 3.17 10²⁸ m / s

this acceleration is in the direction of moving away the alpha particles

7 0

3 years ago

The average diameter of an atom is ________<br><br>(a) 10“8 m <br>(b) 1 m <br>(c) 1A° <br>(d) 10

Thepotemich [5.8K]

Answer

0.1 - 0.5 nano meters

Explanation:

Here ya go buddy! :D

5 0

3 years ago

A cylinder of radius r=10.0 cm and height h=20.0 cm

Olenka [21]

D I think is the correct answer
If the cylinder is slightly

7 0

2 years ago

Suppose we replace both hover pucks with pucks that are the same size as the originals but twice as massive. Otherwise, we keep

andrey2020 [161]

Answer:

w = w₀ / 2 the angular velocity is half the initial value.

Explanation:

We can analyze this exercise as if we added another disk to obtain a disk with twice the mass, for which if the system is two disks, the angular tidal wave is conserved

initial instant.

L₀ = I₀ w₀

final moment

L_f = I w

the moment is preserved

L₀ = L_f

I₀ w₀ = I w

the moment of inertia of a disk is

I = ½ m R²

we substitute

½ m R² w₀ = ½ (2m) R² w

w = w₀ / 2

for the case of a disk with twice the mass, the angular velocity is half the initial value.

4 0

3 years ago

A truck with 34-in.-diameter wheels is traveling at 55 mi/h. Find the angular speed of the wheels in rad/min, *hint convert mile

julia-pushkina [17]

Answer:

w =3416 rad/min

Explanation:

The angular speed of the wheels in radians can be defined as follows:

$w=\frac{s}{r}$

where

w = angular speed

r = radius of the wheel

s =distance traveled per minute

in this case we have

r = 34/2 inches = 17 inches

s = (55 mi/hr) (5280 ft/mi) (12 in/ft) (1hr/60min) = 58,080 inches/min

Therefore, w = 58,080/ 17 = 3416 rad/min

7 0

4 years ago