Amber is a (a) metal (b) rubber (c) resin (d) sugar

Two streams merge to form a river. One stream has a width of 8.4 m, depth of 3.5 m, and current speed of 2.2 m/s. The other stre

hoa [83]

Answer:

Explanation:

We shall solve this problem on the basis of pinciple that water is incompressible so volume of flow will be equal at every point .

rate of volume flow of one stream

= cross sectional area x velocity

= 8.4 x 3.5 x 2.2 = 64.68 m³ /s

rate of volume flow of other stream

= 6.6 x 3.6 x 2.7

= 64.15 m³ /s

rate of volume flow of rive , if d be its depth

= 11.2 x d x 2.8

= 31.36 d

volume flow of river = Total of volume flow rate of two streams

31.36 d = 64.15 + 64.68

31.36 d = 128.83

d = 4.10 m /s .

6 0

2 years ago

A force would not exist by itself, because it is an ___________.

Marysya12 [62]

Answer:

no force exists by itself because every action has an equal and opposite reaction

8 0

2 years ago

How is the earth a cracked hard boiled egg

xz_007 [3.2K]

Answer:

the earth isn't a cracked hard boiled egg, but I'd guess they mean layers. A thin shell/crust and the yolk and whites of the egg represent layers of the earth

Explanation:

6 0

2 years ago

A compact disc (CD) is played by a cd player, which uses a laser to read the tracks on the disc. The disc spins initially at app

uranmaximum [27]

Answer:

a. The laser tracking mechanism experiences a changing tangential velocity

c. The laser tracking mechanism experiences a non-zero angular acceleration

d. The laser tracking mechanism experiences a non-zero tangential acceleration

Explanation:

a. The laser tracking mechanism experiences a changing tangential velocity

This is because the tangential velocity v = rω where r = radius of disc and ω = angular speed of discs. Since r is constant, v ∝ ω.

Since the angular speed changes from 200 rpm to 500 rpm, thus, the tangential velocity would also change.

So, the laser tracking mechanism experiences a changing tangential velocity

c. The laser tracking mechanism experiences a non-zero angular acceleration

Since angular acceleration, α = Δω/Δt where Δω = change in angular speed and Δt = change in time.

Since there is a change in angular speed from 200 rpm to 500 rpm in time Δt, there is thus a non-zero angular acceleration.

So, The laser tracking mechanism experiences a non-zero angular acceleration

d. The laser tracking mechanism experiences a non-zero tangential acceleration

Since tangential acceleration, a = rα where r = radius of disc and α = angular acceleration.

Since there is an angular acceleration of the disc, there is thus going to be a tangential acceleration given by a = rα.

So, the laser tracking mechanism experiences a non-zero tangential acceleration

Statement b is false because, the disc experiences a changing angular speed from 200 rpm to 500 rpm.

4 0

2 years ago

19. Determine the final state and its temperature when 150.0 kJ of heat are added to 50.0 g of water at 20 ºC. (Specific heat of

8090 [49]

The amount of energy to reach the boiling point is $50*80*4.184 J=16,736J$ . To pass the boiling point, $40.79*\frac{50}{18.02}kJ=113,180J$ are necessary (18.02 is the molar mass of water). This means that $150kJ-113.180kJ-16.736kJ=20,084J$ are left. This allows the steam to heat another $\frac{20,084}{50*1.99}=201.8^{\circ}C$ . Therefore, it ends as steam at temperature $100^{\circ}C+201.8^{\circ}C=301.8^{\circ}C$

6 0

3 years ago

Amber is a(a) metal(b) rubber(c) resin(d) sugar​

Amber is a(a) metal(b) rubber(c) resin(d) sugar