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4 years ago

Which of the following tools is used to mark the spot where a hole is to be drilled in a piece of metal?

Physics

2 answers:

Oxana [17]4 years ago

3 0

That's a job for a center-punch.

Snowcat [4.5K]4 years ago

3 0

Answer: Option (b) is the correct answer.

Explanation:

Center punch is a tool which helps to mark a point where we intend to punch a hole in the material without slipping in any direction.

With the help of this mark, it provides a resting place to the drill so that while drilling the hole will be pointed in the right direction.

Thus, we can conclude that out of the given options center punch is the tool used to mark the spot where a hole is to be drilled in a piece of metal.

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Twenty grams of a solid at 70°C is place in 100 grams of a fluid at 20°C. Thermal equilibrium is reached at 30°C.

zaharov [31]

Answer:

c. is more than that of the fluid.

Explanation:

This problem is based on the conservation of energy and the concept of thermal equilibrium

$heat= m s \Delta T
$

m= mass

s= specific heat

\DeltaT=change in temperature

let s1= specific heat of solid and s2= specific heat of liquid

then

Heat lost by solid= $20(s_1)(70-30)=800s_1
$

Heat gained by fluid= $100(s_2)(30-20)=1000s_2
$

Now heat gained = heat lost

therefore,

1000 S_2=800 S_1

S_1=1.25 S_2

so the specific heat of solid is more than that of the fluid.

8 0

3 years ago

When dogs see police dogs do they think "oh no its the cops"?

ira [324]

No they say "Watch out it's the fuzz"

4 0

3 years ago

Read 2 more answers

the presence of which magnetic feature best explains why a magnet can act a distance on other magnets or on objects containing c

katen-ka-za [31]

Magnetic fields

Explanation:

The presence of magnetic fields best explains why a magnet can act a distance on other magnets or on objects containing certain metals.

Magnetic fields are lines of forces around a bar magnet.
These lines of forces attracts and repels other magnetic bodies and metallic bodies round it.
Magnetic lines of forces originates at the north pole and enters in the south pole.
Areas around a magnetic body are bounded by force fields.
A magnet has permanent magnetic fields round it.

learn more:

Electromagnet brainly.com/question/2191993

#learnwithBrainly

8 0

3 years ago

Which is the most abundant element in the Sun?

Delvig [45]

The answer is hydrogen.

5 0

3 years ago

Please answer as soon as possible. <br><br> A Physics question about electricity and circuits.

garik1379 [7]

Answer:

Explanation:

Electrical energy is:

E = IVt

E = 210 * 12 * 10\\\\\\E = 25200 J

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3 years ago