1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Mademuasel [1]
2 years ago
9

Which of these phase changes requires energy?

Physics
1 answer:
frutty [35]2 years ago
7 0

Answer:

A

Explanation:

You have to give energy away for B. You have to think about that carefully. The CO2 starts out with a great deal of energy (mostly KE) and has to slow down to go from gas to a solid. Not B

In general C is the same way. Water has more energy than ice. Not C

Same principle in D.  Not D.

So it's A

You might be interested in
Question 1
romanna [79]

Answer:

1.- the lithosphere, asthenosphere, and mesosphere.

2.- They both described the oceanic type.

3.- Crust, as its depth is less than 100 kilometers

4.- High pressure

☺️

3 0
3 years ago
A fan blade rotates with angular velocity given by ωz(t)= γ − β t2. part a calculate the angular acceleration as a function of t
Katyanochek1 [597]
Given:

w = z(t)= γ − β*t^2

Differentiating both sides with respect to t, we get:

α = z(t) = -2βt

Given: 
<span> γ = 5.35 rad/s and β = 0.810 rad/s3 
</span>
so, For t = 3 sec,

angular acceleration = -2 * 0.810 * 3 = 
<span>-4.86</span>
8 0
4 years ago
Read 2 more answers
Your electricity bill says 834-kWh of consumption. With this amount of energy, how many 59-W light bulbs can be powered for an a
kvv77 [185]

Answer:

2019 light bulbs

Explanation:

So the electrical energy consumed by each 59-W light bulb within 7 hours is the product of the power and time duration

E = Pt = 59 * 7 = 413 Wh or 0.413 kWh

If each light bulb consumes 0.413 kWh, then the total number of light bulbs needed to consume 834 kWh would be

834 / 0.413 = 2019 light bulbs

5 0
4 years ago
What are the density, specific gravity and mass of the air in a room whose dimensions are 4 m * 6 m * 8 m at 100 kPa and 25 C.
Volgvan

Answer:

Density = 1.1839 kg/m³

Mass = 227.3088 kg

Specific Gravity = 0.00118746 kg/m³

Explanation:

Room dimensions are 4 m, 6 m & 8 m. Thus, volume = 4 × 6 × 8 = 192 m³

Now, from tables, density of air at 25°C is 1.1839 kg/m³

Now formula for density is;

ρ = mass(m)/volume(v)

Plugging in the relevant values to give;

1.1839 = m/192

m = 227.3088 kg

Formula for specific gravity of air is;

S.G_air = density of air/density of water

From tables, density of water at 25°C is 997 kg/m³

S.G_air = 1.1839/997 = 0.00118746 kg/m³

4 0
3 years ago
An electron and a proton, initially at rest, are pushed by the same force. Which of the two will have greater velocity?
yulyashka [42]

Answer:

B electron

Explanation:

electron will have greater velocity

7 0
3 years ago
Other questions:
  • Please help asap !!!!!!!!
    9·2 answers
  • A 0.110-kg cube of ice (frozen water) is floating in glycerine. The glycerine is in a tall cylinder that has an inside radius of
    15·1 answer
  • Explain how you can cause light separated by a prism to combine
    11·1 answer
  • A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 290 kg) that is also at rest. The lumberjac
    13·1 answer
  • Sinusoidal water waves are generated in a large ripple tank. The waves travel at 20 cm/s and their adjacent crests are 5.0 cm ap
    13·1 answer
  • A 0.500 kg aluminum pan on a stove is used to heat 0.250 liters of water from 20.0ºC to 80.0ºC. (a) How much heatis required? Wh
    15·1 answer
  • If the mass of a material is 46 grams and the volume of the material is 14 cm^3, what would the density of the material be?
    7·1 answer
  • The suspension system of a 2100 kg automobile "sags" 8.5 cm when the chassis is placed on it. Also, the oscillation amplitude de
    14·1 answer
  • Daniel earned $8.00 per hour at his job. Daniel works 35 hours week. He received a 5% pay increase. How much more money will Dan
    15·1 answer
  • I have this bigfoot worksheet for science. It says, "When designing an experiment, which two groups must be involved?" Can you h
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!