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disa [49]
3 years ago
8

In which of these situations is convection most likely the main form of heat transfer? A.Warm air from a heater on the first flo

or of a house moves to the upper floors.
B.The sides of a metal pan become hot when the pan is placed on a stove burner.
C.A person gets a sunburn from lying on the beach too long.
D.An ice cube melts when a person holds it in his hand.
Physics
2 answers:
Sergeeva-Olga [200]3 years ago
6 0
All points ate true

But option A is perfect
andreyandreev [35.5K]3 years ago
6 0

Answer:

A.   Warm air from a heater on the first floor of a house moves to the upper floors.

Explanation:

As we know that in convection mode of heat transfer the thermal energy is transferred from one point to other point which the actual movement of the medium molecules.

When thermal energy is given to the medium particles then due to difference in the density medium molecules will move from one point to other point along with the thermal energy.

So here we can say that correct answer will be

A.Warm air from a heater on the first floor of a house moves to the upper floors.  

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Define pressure in short
Makovka662 [10]

Answer:

hope it helps......

Explanation:

Pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.

7 0
3 years ago
The surface is tilted to an angle of 37 degrees from the horizontal, as shown above in Figure 3. The blocks are each given a pus
hoa [83]

Answer:

Incomplete question: "Each block has a mass of 0.2 kg"

The speed of the two-block system's center of mass just before the blocks collide is 2.9489 m/s

Explanation:

Given data:

θ = angle of the surface = 37°

m = mass of each block = 0.2 kg

v = speed = 0.35 m/s

t = time to collision = 0.5 s

Question: What is the speed of the two-block system's center of mass just before the blocks collide, vf = ?

Change in momentum:

delta(P)=F*delta(t)

P_{f} -P_{i}=F*delta(t)

2m(v_{f} -v_{i})=F*delta(t)

v_{i} =0.35-0.35=0

It is neccesary calculate the force:

F=(m+m)*g*sin\theta

Here, g = gravity = 9.8 m/s²

F=(0.2+0.2)*9.8*sin37=2.3591N

v_{f} =\frac{F*delta(t)}{2m} =\frac{2.3591*0.5}{2*0.2} =2.9489m/s

6 0
2 years ago
A car moving in a straight line starts at X=0 at t=0. It passesthe point x=25.0 m with a speed of 11.0 m/s at t=3.0 s. It passes
Agata [3.3K]

Answer:

Average velocity v = 21.18 m/s

Average acceleration a = 2 m/s^2

Explanation:

Average speed equals the total distance travelled divided by the total time taken.

Average speed v = ∆x/∆t = (x2-x1)/(t2-t1)

Average acceleration equals the change in velocity divided by change in time.

Average acceleration a = ∆v/∆t = (v2-v1)/(t2-t1)

Where;

v1 and v2 are velocities at time t1 and t2 respectively.

And x1 and x2 are positions at time t1 and t2 respectively.

Given;

t1 = 3.0s

t2 = 20.0s

v1 = 11 m/s

v2 = 45 m/s

x1 = 25 m

x2 = 385 m

Substituting the values;

Average speed v = ∆x/∆t = (x2-x1)/(t2-t1)

v = (385-25)/(20-3)

v = 21.18 m/s

Average acceleration a = ∆v/∆t = (v2-v1)/(t2-t1)

a = (45-11)/(20-3)

a = 2 m/s^2

8 0
3 years ago
Which statement is not a good practice when working inside a computer case?
lozanna [386]

Answer:

a. be sure to hold expansion cards by the edge connectors

Explanation:

Removal of loose jewelry is a good safety practice. Also not touching a microchip with a magnetized screwdriver is also a good practice.

But holding expansion cards by the edge connectors is not a good practice, so it is the odd one in the question. Therefore answer option a provides the correct and best answer to the question

3 0
3 years ago
Help pls they are all going to have the same answers.
Liula [17]
1.activities of daily living.
2.activity of daily living.
3.planned exercises activities.
4. planned exercises activities.
5. activities of daily living.
6. planned exercises activities.
4 0
3 years ago
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