Answer:
70.07 Hz
Explanation:
Since the sound is moving away from the observer then
and
when moving towards observer
With
of 76 then taking speed in air as 343 m/s we have


Similarly, with
of 65 we have

Now

v_s=27.76 m/s
Substituting the above into any of the first two equations then we obtain

Answer:
Only main sequence stars have a well-defined relationship between spectral type and luminosity.
Explanation:
Low-mass stars have much longer lifetimes than high-mass stars.
Answer:
a) 0.05s
b) 4000N
Explanation:
a)When car is stopped its final velocity become zero
U- 10 m/s
V- 0 m/s
S - 0.25 m
t -?
S = (v+u)*t/2
0.25 =(10+0)*t/2
t = 0.05s
b) If we happened to calculate the avarage force we have to consider about acceleration
V= 0
U = 10
t = 0.05 s
a =?
V = U + at
0 = 10 -a * 0.05
a = 200 m/s2
F = m *a
= 20 * 200
= 4000N
♥ C) 94%
♥ If the work put into a lever is 930 joules and the work accomplished is 870 joules, the efficiency of the lever is 94%.
♥ <span>870/930=93.5
</span>♥ And rounded you get 94.
Identifying the word that is described by each statements in the question is listed below:
- Evaporation
- Transpiration
- Hydrosphere
- Water Cycle
- Condensation
<h3>Meaning of Water </h3>
Water can be simply defined as any fluid or substance that is odurless, colorless and tasteless.
Water is a very important factor and substance that sustains life in humans and plants on earth.
Water tends to undergo different changes and processes in plant, animals and even as a substance on its own
In conclusion the above listed processes are all related to water.
Learn more about Water: brainly.com/question/1313076
#SPJ1