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3 years ago

How does a thermostat know how to keep hot soup hot and cold soup cold?

1 answer:

3 0

A thermos keeps thing hot or cold by using vacuum technology to keep air from getting inside. The double walled feature of the cup is what allows the container to be "vacuum sealed". In manufacturing the air between the two walls is removed creating the seal. The lack of air keeps the heat or cold from transfering, therefore letting it remain basically the same temperature.

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A car is traveling at 10 m/s. 10 seconds later the car is traveling 40 m/s. What is the car’s acceleration?

ratelena [41]

Answer:

a = 3 m/s^2

Explanation:

Vi = 10 m/s

Vf = 40 m/s

t = 10 s

Plug those values into the following equation:

Vf = Vi + at

40 = 10 + 10a

---> a = 3 m/s^2

3 0

3 years ago

If you want a charged object to become neutral,then you have to ————-? A.Touch it with a positively charged object B.Touch it wi

JulsSmile [24]

A) Touch it with a positively charged object

6 0

3 years ago

Read 2 more answers

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Novay_Z [31]

Answer:

Jshanauaanajangdudnndu

3 0

3 years ago

What is the pressure exerted on a 100 cm2 plate by a weight of 200 N resting on the plate? 0 A) 20 MPa O B) 20,000 kPa C) 2 Pa

liberstina [14]

Answer:

The answer is E) 20kPa

Explanation:

Here we use the definition of Pressure: Pressure is a physical quantity that measures the projection of force in the perpendicular direction per unit area. In this case, wehave a 200N Force over a 100cm^2 Area

In order to have the pressure in international units we need to convert those cm^2 to m^2 this way:

We know 100cm is equal to 1m

$(100cm^2)*((1m^2)/(100cm)^2)$

In this case, the area will be equal to 0,01m^2

With this information we use the Pressure equation, which based on the definition will be:

$P=F/A$

Solving:

$P=(200N)/(0,01m^2)$

$P=20000Pa$

Then P is the same as 20kPa

3 0

3 years ago

A uniform cube with mass 0.700 kg and volume 0.0270 m3 is sitting on the floor. A uniform sphere with radius 0.400 m and mass 0.

Sav [38]

Answer:

44 1/3 cm

Explanation:

The cube has an edge length of ∛0.027 m = 0.3 m, so a center of mass (CoM) 15 cm above the floor.

The sphere's center of mass is 40 cm above the top of the cube, so is 70 cm above the floor. The weighted average of the CoM locations is ...

((15 cm)(0.700 kg) +(70 cm)(0.800 kg))/(0.700 kg +0.800 kg)

= (10.5 kg·cm +56 kg·cm)/(1.500 kg) = 44.333... cm

The center of mass of the two-object system is 44 1/3 cm above the floor.

_____

<em>Comment on the units</em>

We're not familiar with "hcm" as a unit. We presume that you can convert the given answer to the units you desire.

6 0

3 years ago