-9 and +2
Hope I helped :)
Answer: 0.392 m/s
Explanation:
The Doppler shift equation is:
Where:
is the actual frequency of the sound wave
is the "observed" frequency
is the speed of sound
is the velocity of the observer, which is stationary
is the velocity of the source, which are the red blood cells
Isolating :
Finally:
Doug needs to change the <em>exercises </em>he is doing. Your body begins to become accustomed to what you do, and if you do the same thing every single time - you will stop making progress, and they'll simply become easy.
However, if you walk into the gym and your body is expecting you to just go over and bench press some, go rock some curls, head over to the squat rack then go home - but instead you start out with some dips, then go do lunges, then attack your triceps instead of biceps, your body will be shocked!
When you change it up, your body will react. The goal is to be comfortable being uncomfortable. Also, one of the most overlooked things in working out is the intensity. If you bring it everything you got and go to the last gut wretching rep, you'll see results.
However, if you just leisurely do things with 4 minute rests in between - you won't see true progress.
Hopefully, this helps! =)
Answer:
0.0928J
Explanation:
the pulling force of spring F=-kx
where x is the displacement from equilibrium position.
energy stored:
*** Its fine if you know nothing about calculus. Just apply the equation
where U is the potential energy of the spring***
put x=0.150, 
×
= 0.0928J (corr. to 3 sig. fig.)
-- Sound energy. That's how you hear it explode.
-- Light energy. That's how you see it in the sky.
-- Heat energy. That's why you get burned if sparks fall on you.
-- Potential energy, as all the pieces fall to the ground.
These were all stored in it as chemical energy before it exploded.
