The process of determining the value of the individual forces acting upon an object involve an application of Newton's second law (Fnet<span>=m. a) and an application of the meaning of the </span>net force<span>.</span>
Answer:
vertical velocity = 33.55 m/s
Explanation:
sin (34) = v/60
sin (34) x 60 = v
33.55 m/s = v
Answer:
net work done by friction = - 2205 J
Explanation:
given,
mass of sled = 80 kg
slide down at an angle of 18°
length = 90 m
travel horizontally = 20 m before starting back up a 16° incline.
net work = ?
net work done by friction = change in potential energy
= mg (h_f - h_i)
= (75) (9.8) (- 27.81 + 24.81)
net work done by friction = - 2205 J
The pitch of a sound is decreased, when a sound source approaches the observer.
<u>Explanation:</u>
Pitch is nothing but it is a property that helps to determine whether the sound is high or low. Doppler effect helps to understand this concept easily. The pitch of the sound is mainly calculated based on the frequency of the sound wave arose from the sound source.
As the wellspring of sound waves moves toward an audience, the sound waves draw nearer together, expanding their recurrence and the pitch of the sound.
