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yanalaym [24]
3 years ago
6

Pls help I will mark brainliest

Physics
2 answers:
xenn [34]3 years ago
6 0

10) A

11) C (i think)

12) D (i think)

Korolek [52]3 years ago
3 0

10). on

11). Mars has less mass than earth has.

12). Sorry. As an Electrical Engineer, I don't like any of these choices.

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amm1812

Answer: D. They are the coldest stars.

Explanation:

5 0
2 years ago
What is the formula for silver nitrate
serious [3.7K]

Answer:

Explanation:

Agno3

8 0
4 years ago
1. Place these unknown pH test papers in order from most acidic to most alkaline.
Naddika [18.5K]

Answer: B

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7 0
3 years ago
An electrical heater 100 mm long and 5 mm in diameter is inserted into a hole drilled normal to the surface of a large block of
slega [8]

Answer:

T_{1}=94.9^{o}C

Explanation:

Given data

length=100mm

Diameter=5mm

Thermal conductivity=5 W/m.K

Power=50 W

Temperature=25°C

The temperature of heater surface follows from the rate equation written as:

T_{1}=T_{2}+\frac{q}{kS}

Where S can be estimated from the conduction shape factor for a vertical cylinder in semi infinite medium

S=\frac{2\pi L}{ln(\frac{4L}{D} )} \\

Substitute the given values

S=\frac{2\pi (0.1m)}{ln[\frac{4*0.1m}{0.005m} ]}\\ S=0.143m

The temperature of heater is then:

T_{1}=25^{o}C+\frac{50W}{5W/m.K*0.143m} \\T_{1}=94.9^{o}C

The temperature reached by the heater when dissipating 50 W with the surface of the block at a temperature of 25°C.

                           T_{1}=94.9^{o}C

5 0
3 years ago
A light wave traveling through medium 1 strikes a boundary with medium 2 at at a 45 degree angle. the light then enters the seco
Alona [7]

Here light ray strikes to interface at an angle of 45 degree and then refracts into other medium such that it will bend towards boundary.

So here the angle of incidence will be less than the angle of refraction as light moves towards the boundary after refraction which mean it will bend away from the normal

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So in above two options medium 1 is denser and medium 2 is rarer

8 0
3 years ago
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