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1 year ago

? Any idea on this I’m getting some mixed up

Physics

1 answer:

Lana71 [14]1 year ago

3 0

Answer:

1. electrochemical reaction

2. combustion

3. photosynthesis

4. respiration

Explanation:

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Fossils are dated using radioactive...<br><br> a. hydrogen <br> b. helium<br> c. carbon

OlgaM077 [116]

Answer:

carbon

Explanation:

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3 years ago

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Newtown third law applies to blank of objects

fomenos

Answer:

All

Explanation:

I'm not sure what you meant but Newton's third law which basically states that every action has an equal and opposite reaction applies to <em>all</em> objects. So I think the answer is all.

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3 years ago

The force you have to overcome to start an object moving is ____. A. Rolling friction c. Sliding friction b. Static friction d.

finlep [7]

Air resistance Please select the best

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3 years ago

There is danger of a vehicle skidding on a wet road.

matrenka [14]

Assertion(A):'

There is danger of a vehicle skidding on a wet road.

<h3>Reason (R) : </h3>

The tyres of the vehicle lose their grip on the road due to increase in friction due to presence of water on the road.

Answer:-

Assertion is true
Reason is true
Reason is the perfect explanation of Assertion

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2 years ago

A 4.6 g lead bullet moving at 278 m/s strikes a steel plate and stops. If all its kinetic energy is converted to thermal energy

iren2701 [21]

Answer:

ΔT = 302 °c

Explanation:

mass (m) = 4.6 g = 0.0046 kg

velocity (v) = 278 m/s

specific heat of lead (c) = 128 J/kg. °c

kinetic energy = 0.5 mx $v^{2}$

kinetic energy = 0.5 x 0.0046 x $278^{2}$

kinetic energy = 177.8 J

since all the kinetic energy is converted to thermal energy,

kinetic energy = thermal energy (E) = 177.8 J

thermal energy = m x c x ΔT

where ΔT is the temperature change

177.8 = 0.0046 x 128 x ΔT

ΔT = 177.8 / 0.59

ΔT = 302 °c

3 0

2 years ago