Considering the definition of speed, the speed of Sam is 3.6
.
<h3>Definition of speed</h3>
Speed is a quantity that expresses the relationship between the space traveled by an object. That is, the speed is associated with the change of position of an object in space within a certain amount of time.
The speed can be calculated using the expression:

<h3>Speed of Sam</h3>
In this case, you know:
- displacement= 9 km
- time= 2.5 h
Replacing in the definition of speed:

Solving:
<u><em>speed= 3.6 </em></u>
Finally, the speed of Sam is 3.6
.
Learn more about speed:
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Answer:
4.
Explanation:
Given,
frequency of standing wave = 603 Hz
length of string,L = 1.33 m
speed of the wave, v = 402 m/s
number of antinodes = ?
Wavelength of the standing wave



Number of anti nodes in the standing wave



n =3.97= 4.
Number of antinodes is equal to 4.
Answer: 1960 N
Explanation:
The bear is sliding down at constant velocity: this means that its acceleration is zero, so the net force is also zero, according to Newton's second law:

There are two forces acting on the bear: its weight W, pulling downward, and the frictional force Ff, pulling upward. Therefore, the net force is given by the difference between the two forces:

From the previous equation, we find that the frictional force is equal to the weight of the bear:
