Why can't we breath under water?
Answers
We can certainly draw water into our lungs, even though
our brain screams "Don't do that !".
But our lungs can only separate oxygen out of air, not out of
water. So if there's only water in our lungs, we pass out after
a short time because we're not getting any oxygen.
Related Questions
A worker kicks a flat rock lying on a roof. The rock slides up the incline 10.0 m to the apex of the roof, and flies off the roof as a projectile. What maximum height (in m) does the rock attain? Assume air resistance is negligible, vi = 15.0 m/s, μk = 0.425, and that the roof makes an angle of θ = 42.0° with the horizontal. (Assume the worker is standing at y = 0 when the rock is kicked.)
A device has power -2 D . The device is a.A convex lens of focal length 50 cmb.A concave lens of focal length 50 cmc.A convex lens of focal length 2 md.A concave lens of focal length 2 m
The unit of electric potential or electromotive force is the _____.voltohmamperefranklin
A reaction in which small nuclei combine to form a heavier nucleus is called ____. a. fission c. background radiation b. a chemical reaction d. fusion
Answers
Answers
The work done will be "250 J".
According to the question,
- Force, F = 50 N
- Distance, d = 5 m
The work done is:
→
or,
→
By substituting the values, we get
Thus the above response is correct.
Learn more about work done here:
Work Done = 5m • 50N
Work Done = 250J
Answer: 250 Joules
b. traveling toward the listener
c. traveling away from the listener
Answers
Answer: Answer is "B"
Explanation:
A physical situation of this question can be conceived as follows: If a siren is blowing through a certain distance in motion, then the listener find out that the velocity of the sound wave increases as the source of the siren is approaching the listener. The listener hear the maximum sound frequency and velocity of the source as it reaches him. However, the source velocity decreases as the siten moves away from the listener which can be said to be negative. Therefore, the correct answer is that the velocity increases as the source is moving towards the listener which is option "B"
Final answer:
In Physics, a positive velocity of a source usually indicates that the source is moving towards the observer or listener. This is based on the principles of the Doppler effect. The sign convention can change depending on the reference system
Explanation:
In the realm of Physics, particularly in the study of waves and sound, when we say that the velocity of the source is positive, it generally means that the source is traveling towards the listener. This is in line with the convention in Doppler effect, a phenomenon observed whenever the source of waves is moving with respect to the observer. Given this, the correct answer to your question would be (b) traveling toward the listener.
However, be mindful that the sign convention may vary depending on the context or the reference system being used. Still, the major principle remains: the perceived frequency is higher if the source is moving towards the observer, associated with a positive velocity; and lower if it's moving away, associated with a negative velocity.
Learn more about Velocity and Direction here:
#SPJ12
Answers
Answers
A) The star must be very large.
B) The star must be very small.
C) The star must be moving away from Earth.
D) The star must be moving closer to Earth.