Answer: Option (B) is the correct answer.
Explanation:
It is advised that while conducting an experiment in a laboratory, always perform it under the supervision of your teacher.
When Hiro accidentally touches the liquid then he should immediately tell his teacher about it so that timely precaution can be taken to avoid any damage or side effect. Also, Hiro should rinse his hand in the sink because it will neutralize or decrease the effect of spilled liquid on his skin.
Thus, we can conclude that he should tell his teacher about the spill and rinse his hand in the sink.
No, the pins do not have the same velocity when they are knocked down.
Explanation:
Speed is a scalar quantity while Velocity is a vector quantity.
A scalar quantity has one component that is the magnitude of that quantity. A vector quantity on the other hand has two components. First is the magnitude of the quantity and the second component is the direction.
Velocity is a vector quantity and it has two components; the magnitude which is the same as the speed and the direction.
In the given situation, the pins when knocked down have same speed but the direction is different. If one component of a vector quantity changes, the quantity is said to be different. We cannot say that two bodies moving with same speed in different directions have same velocities.
Keyword: Vector Quantity
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They are poor conductors of heat so they will not transfer the heat from the pot to your hand
No it isn't. Speed and direction are both components of velocity.
When you run around the track at 5 km/hr, although your speed is
constant, your direction keeps changing, so your velocity does too.
Answer:
red shift, indicating that the universe is expanding
Explanation:
Doppler effect occurs when a source of a wave (e.g. light, or sound waves) moves relative to an observer; as a result of this relative motion, the wavelength of the wave appears lengthened/shortened to the observer. Two situations can occur:
- The source of the wave is moving towards the observer - in this case, the wavelength of the wave becomes shorter. If the wave is visible light, such as the light emitted by distant galaxies, this means that the wavelength of the light shifts towards the blue-end of the spectrum (blue-shift)
- The source of the wave is moving away from the observer - in this case, the wavelength of the wave becomes longer. If the wave is visible light, such as the light emitted by distant galaxies, this means that the wavelength of the light shifts towards the red-end of the spectrum (red-shift)
In our universe, we observe a red-shift for all the distant galaxies: this means that these galaxies are moving away from us, so this is an indication that the universe is expanding.
