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motikmotik
3 years ago
10

Liquids have what kind of volume and shape

Physics
1 answer:
Xelga [282]3 years ago
6 0
A liquid has a definite volume but takes the shape of whatever object it's in.
Brainliest please! Hope this Helps!
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A small block on a frictionless, horizontal surface has a mass of 0.0250 kg. It is attached to a massless cord passing through a
frosja888 [35]

Answer:

a) Yes

b) 7 rad/s

c) 0.01034 J

Explanation:

a)

Yes the angular momentum of the block is conserved since the net torque on the block is zero.

b)

m = mass of the block = 0.0250 kg

w₀ = initial angular speed before puling the cord = 1.75 rad/s

r₀ = initial radius before puling the cord = 0.3 m

w = final angular speed after puling the cord = ?

r = final  radius after puling the cord = 0.15 m

Using conservation of angular momentum

m r₀² w₀ = m r² w

r₀² w₀ = r² w

(0.3)² (1.75) = (0.15)² w

w = 7 rad/s

c)

Change in kinetic energy is given as

ΔKE = (0.5) (m r² w² - m r₀² w₀²)

ΔKE = (0.5) ((0.025) (0.15)² (7)² - (0.025) (0.3)² (1.75)²)

ΔKE = 0.01034 J

6 0
3 years ago
4. (a) A tank containing methanol has walls 2.50 cm thick made of glass of refractive index 1.550. Light from the outside air st
zhenek [66]

Answer:

29.775°

1.911

Explanation:

Law of refraction(Snell's law):  

n_1 sin Ф_1 = n_2 sin Ф_2  

n_1 = The index of refraction for material with incident light,

n_2 = The index of refraction for material with refracted light

Ф_1= angle of incidence,

Ф_2 = angle of refraction.  

Note: the angle is measured from the normal: a line drawn perpendicular to the surface at the point where the incident ray strikes the surface.

The Part of the light which continues into the second medium is transmitted rather than reflected, but the transmitted ray changes direction as it crosses the boundary. The transmission of light from one medium to another, but with a change in direction, is called refraction. The angles of the incidence and reflected light is described by (Snells law) which is shown above.  

a)

n_3 = 1.329 —> for metalmol —> from table

1 —> in air

2 —> in the glass

3 —> in methanol  

from air to glass

n_1 sin Ф_1 = n_2 sin Ф_2  

1 x sin 41.3° =  1.550  sin Ф_2  

Ф_2 = arcsin(1*sin41.3°/1.550) = 25.201°

from glass to methanol:

n_2 sin Ф_2 = n_3 sin Ф_3  

1.550 sin 25.201° = 1.329 * sin Ф_3

Ф_3 = arcsin(1.550 sin 25.201°/1.329) = 29.775

from glass to unknown:

n_2 sin Ф_2 = n_3 sin Ф_3  

1.550 sin 25.201° = n_unknown * sin 20.2

n_unknown = 1.550 sin 25.201°/sin 20.2

                     = 1.911

5 0
3 years ago
A net force of 1.0N acts on a 4.0 kg object, initially at rest, for 4.0 seconds. What is the distance the object moves during th
Eva8 [605]
Use F=ma to solve for a=0.25m/s^2. Now to get distance you need to integrate this twice to get
x=(1/2)at^2. Plug in a and t to get
x=2m
8 0
3 years ago
During which phase does the arrangement of water molecules become more orderly?
erastovalidia [21]
I believe the correct answer from the choices listed above is option D. During the condensing phase that the <span>arrangement of water molecules become more orderly. Condensation is the phase change from gas to liquid. Liquid molecules has more order than the gas state. Hope this answers the question.</span>
3 0
3 years ago
Calculate the work done by Kevin as he lifts 3 boxes (mass=45 KG) 57 CM high with an acceleration recorded to be 12.3 m/s^2.
anyanavicka [17]
Answer = 31.5J (rounded to 1dp)

The question wants to find the work done, where work done can be calculated in the equation:

Work done = Force x Distance

The force is not given in the question, however they give the acceleration and mass, so you can calculate the force using Newton's second law:

Force = Mass x Acceleration

First, calculate the force. The mass is 45kg for the 3 boxes and the acceleration is 12.3m/s^2.

Force = 45 x 12.3

Force = 553.5N

Now that you have the force (553.5N) and distance (57cm), substitute those values into the equation for work done.

Make sure to convert the 57cm into metres (into SI units), otherwise the answer would be wrong.

57cm = 0.057m

Work done = Force x Distance

Work done = 553.5 x 0.057

Work done = 31.5J (rounded to 1dp)
8 0
2 years ago
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