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defon
3 years ago
10

In winter why do water tanks start freezing from surface and not from bottom

Physics
1 answer:
Strike441 [17]3 years ago
4 0

Cause it’s denser at the bottom

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If two different substances, with the same mass (1 gram) absorb the same amount of energy, which of the following can be predict
Makovka662 [10]

If two different substances, with the same mass (1 gram) absorb the same amount of energy "the temperature of the substance with the lower specific heat will increase more than the one with a higher specific heat".

Option B

<u>Explanation:</u>

The thermodynamic function that specifies the amount of heat needed by one degree of temperature for a single unit of mass of a material to be elevated is understood as "Specific heat". Depending on the extent to which they absorb heat, various levels of specific heat values are seen for the materials.

The heat transferred relies on three factors: temperature change, weight of the device, material change and stage of the material. The average temperature of the molecules increases as the material heats up, so when they collide they are more likely to contribute enough energy to cause rotation and vibration to happen as the energy moves to a higher state.

8 0
3 years ago
A rod made up of a single element is used to heat water using electricity. To which group does this element probably belong to?
aliina [53]
Nichrome is usually used as the rod to heat water using electricity.  It is an example of Nickel and  belongs to the element Nickel in the periodic table.  
4 0
4 years ago
Read 2 more answers
In the Daytona 500 auto race, a Ford Thunderbird and a Mercedes Benz are moving side by side down a straightaway at 71.0 m/s. Th
elena55 [62]

<u>Answer:</u>

<em>Thunderbird is 995.157 meters behind the Mercedes</em>

<u>Explanation:</u>

It is given that all the cars were moving at a speed of 71 m/s when the driver of Thunderbird  decided to take a pit stop and slows down for 250 m. She spent 5 seconds  in the pit stop.

Here final velocity v=0 \ m/s

initial velocity u= 71 m/s  distance  

Distance covered in the slowing down phase = 250 m

v^2-u^2=2as

a= \frac {(v^2-u^2)}{2s}

a = \frac {(0^2-71^2)}{(2 \times 250)}=-10.082 \ m/s^2

v=u+at

t= \frac {(v-u)}{a}

= \frac {(0-71)}{(-10.082)}=7.042 s

t_1=7.042 s

The car is in the pit stop for 5s t_2=5 s

After restart it accelerates for 350 m to reach the earlier velocity 71 m/s

a= \frac {(v^2-u^2)}{(2\times s)} = \frac{(71^2-0^2)}{(2 \times 370)} =6.81 \ m/s^2

v=u+at

t= \frac{(v-u)}{a}

t= \frac{(71-0)}{6.81}= 10.425 s

t_3=10.425 s

total time= t_1 +t_2+t_3=7.042+5+10.425=22.467 s

Distance covered by the Mercedes Benz during this time is given by s=vt=71 \times 22.467= 1595.157 m

Distance covered by the Thunderbird during this time=250+350=600 m

Difference between distance covered by the Mercedes  and Thunderbird

= 1595.157-600=995.157 m

Thus the Mercedes is 995.157 m ahead of the Thunderbird.

6 0
3 years ago
a filament lamp of resistance 3 ohms is connected to the terminals of a 6 V battery. when the switch is closed, the current in t
vivado [14]

voltage = current * resistance

so

current = voltage/resistance

therefore,

current = 6/3 A = 2 A

6 0
4 years ago
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A car has a speed of 2 m/s and a mass of 1500kg. What is the car’s kinetic energy
kumpel [21]

Answer:

3,000 m/s

Explanation:

3,000 m/s

6 0
3 years ago
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