Lila is a track and field athlete. She must complete four laps around a circular track. The track itself is a 400 meter track an
1 answer:
Answer:
A. Her speed is 4.4 m/s, and her velocity is 0 m/s.
Explanation:
Given parameters:
Length of path = 400m
Time taken = 6min = 360s
Unknown:
Speed and velocity = ?
Solution:
Velocity is the displacement divide by the time. Displacement takes into the account the distance covered with specific reference to direction. Since the student started and ended the journey on the same spot, the net displacement is 0.
So,
Since velocity =
Velocity = 0
Speed is the distance divided by time;
One lap = 400m,
four laps = 400 x 4 = 1600m
Speed = = 4.4m/s
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Answer:
he same direction the magnitude of the resultant is equal to the scalar sum of the magnitude of the forces, but if they are applied in different directions the magnitude must be found using the Pythagorean theorem
Explanation:
When there are several applied forces, if they are all in the same direction the magnitude of the resultant is equal to the scalar sum of the magnitude of the forces, but if they are applied in different directions the magnitude must be found using the Pythagorean theorem, so which the resulting dowry is less than the sum of the magnitudes.
Let's carry out an example with two forces, F1 and F2 of equal magnitudes
if they are in the same direction
F_total = F₁ + F₂ = 2 F
if they are at 90º
F_total =
if they are at 180º
F_total = F₁ -F₂ = 0