All phase changes are .an example of a phase change is an ice cube melting

Which scientist explained why binary stars change colors?

motikmotik

Answer:

C

Explanation:

5 0

3 years ago

An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. How deep is th

Thepotemich [5.8K]

Answer:

a. x=5355m b. food

Explanation:

A wave is a disturbance wic travels through a medium, it transfers energy without the displacement of the medium itself.

the problem can be solved with this formula v

v=2x/t

v=speed of the ultrasonic wave in seawater

x=te distance between the seawater surface and the seawater bed

t=time it takes to travel to and fro te seawater bed to the surface

v= 1530 m/s, t=7 s , x=?

1530=2x/7

1530*7=2x

x=5355m

b. An example of stored h energy is food, petroleum etc.Chemical energy are Energy stored in the bonds of chemical compounds. Chemical energy may be released during a chemical reaction, often in the form of heat; called exothermic.

Reactions that require an input of heat to proceed may store some of that energy as chemical energy in newly formed bonds. we eat food so that we can h enough energy to carry out our day to day task.

3 0

3 years ago

A tourist stands at the top of the Grand Canyon, holding a rock, overlooking the valley below. Find the final velocity, and disp

uranmaximum [27]

Answer:

a. Vf = 39.24 [m/s]

b. Vf = 31.24 [m/s]

c. Vf = 47.24 [m/s].

Explanation:

To solve this problem we can use the following equation of kinematics. We have to keep in mind that the gravitational acceleration acts downwards, therefore when the rock falls towards the abyss it has the same direction of the acceleration and that is why the gravitational acceleration has a positive sign in the equation.

$v_{f}=v_{o}+g*t$

where:

Vf = final velocity [m/s]

Vo = initial velocity = 0 (when the rock is dropped)

g = gravitational acceleration = 9.81 [m/s²]

t = time = 4 [s]

a.

$v_{f}=0+9.81*4\\v_{f}= 39.24 [m/s]$

b.

In this particular situation, the acceleration will be taken as negative because the gravity is pointing in the opposite direction of the movement of the rock.

$v_{f}=8-(9.81*4)\\v_{f}=-31.24[m/s]$