An object is falling under the influence of gravity in presence of air resistance . There are two forces acting on it. (i) What
1 answer:
You might be interested in
Answer:
n the case of linear motion, the change occurs in the magnitude of the velocity, the direction remaining constant.
In the case of circular motion, the magnitude of the velocity remains constant, the change in its direction occurring.
Explanation:
Velocity is a vector therefore it has magnitude and direction, a change in either of the two is the consequence of an acceleration on the system.
In the case of linear motion, the change occurs in the magnitude of the velocity, the direction remaining constant.
= (v₂-v₁)/Δt
In the case of circular motion, the magnitude of the velocity remains constant, the change in its direction occurring.
= v2/R
In the general case, both the module and the address change
a = Ra ( a_{t}^2 + a_{c}^2)
Answer:
a.
b.
c.
d.
e.
Explanation:
<u>Work and Kinetic Energy </u>
When an object moves at a certain velocity v0 and changes it to v1, a change in its kinetic energy is achieved:
Knowing that
We have
The work done by the force who caused the change of velocity (acceleration) is
If we know the distance x traveled by the object, the work can also be calculated by
Being F the force responsible for the change of velocity
The 75 kg baseball player has an initial velocity of 6 m/s, then he slides and stops
a. Before the slide, his initial kinetic energy is
b. Once he reaches the base, the player is at rest, thus his final kinetic energy is
c. The change of kinetic energy is
d. The work done by friction to stop the player is
e. We compute the force of friction by using
and solving for x
The negative sign indicates the force is against movement
Answer:
(a) the observed frequency is 200 Hz
(b) the observed frequency is 188 Hz.
Explanation:
speed of the truck, Vs = 27 m/s
frequency of the truck as it approaches, Fs = 185 Hz
(a) Apply Doppler effect to determine the frequency you will hear.
As the truck approaches you, the observed frequency will be higher than the source frequency because of decrease in distance.
Where;
Fo is the observed frequency which is the frequency you will hear.
V is speed of sound in air
(b) Apply the following formula for a moving observer and a moving source;
The observed frequency is negative since you are driving away from the truck and the source frequency is also negative since it is driving towards you.