You would need to ear defenders (I'm assuming these are ear protectors for use with loud sounds) while firing at a gun range. You could use it for loud construction areas.
Answer: The light bends because light travels fast but it slows down in a denser medium. For example light refracts in water or it bends after passing through air. When light passes through air ( a less dense medium ) then through water ( a more dense medium ) the beam of light bends because light travels more slowly in a denser medium then it picks up its pace again once it passes. The density of the substance determines how much the light is refracted. I hope this makes sense and I hope this answered your question!! :)
Kinetic energy in the faster car is way too uzi fast to be stopped faster since it has less kodak potential energy. The slower car has more potential energy so it will be able to lil stop boat at a much smoother and shorter distance.
Answer:
τ=9.2 N.m
Explanation:
The component that contributes to torque is the y-component of the force F, so:
τ = r x F = (0.23 m) * (40 N) = 9.2m
Expressed as a vector equation:
τ = [0.23,0] x [ -31, 40] = [0, 0, 9.2] N.m
Answer:
Q = 640425 J = 640.425 KJ
Explanation:
From the law of conservation of energy:
Heat Addition = Heat Gain of Water + Heat Gain of Aluminum Kettle
where,
Q = Heat addition required = ?
= mass of water =1.8 kg
= mass of aluminum kettle = 1.1 kg
= specific heat capacity of water = = 4200 J/kg.°C
= specific heat capacity of aluminum kettle = = 890 J/kg.°C
= = change in temperature of water and kettle = 95°C - 20°C = 75°C
Therefore,
Q = 567000 J + 73425 J
<u>Q = 640425 J = 640.425 KJ</u>