Answer:
meter, kilogram
Explanation:
Here we want to know how big the tiger is. This means that we want to measure its size and possibly its mass.
The size is actually a measure of the length of the tiger, and length is measured in meters.
The mass of an object, instead, is a measure of the "amount of matter" in the substance, and it is measured in kilograms.
The other options are wrong because:
- The second is the unit of time
- The candela is the unit of the luminous intensity
- The mole is the unit of the amount of substance, and it is used for gases
- The ampere is the unit of the current
Answer:
1.25 rev/s
Explanation:
N = mv^2/r (normal force )
f = μN [Frictional force ]
f = mg
μN = mg
μ(mv^2/r) = mg
v = √(rg/μ)
min rotational velocity
v = √(rg/μ) = √(2.5 * 9.8/0.40) = 7.83 rad/sec
= 7.83/2π = 1.25 rev/s
Your answer would be the letter B.)
:)
Answer:
Explanation:
The Doppler effect occurs when a source of waves and/or observer move relative to each other, resulting in the observer measuring a different frequency of the waves than the frequency that the source is emitting.
Let use our case study.
It would be higher pitched when approaching due to the Doppler effect.
The sound waves as you approach them, travel faster relative to you so they pass more frequently which is higher pitched. when you travel away from the source you are out-speeding these waves so they sound slower and thus, lower-pitched.
When a car approaches bus, the sound waves that reach person on the bus have a shorter wavelength and a higher frequency. The person hear a sound with a higher pitch. When the car moves away from bus, the sound waves that reach the person have a longer wavelength and lower frequency. The person hear a sound with a lower pitch.