#2 Distance (d) = _______37.5cm____________
1 answer:
You might be interested in
Answer:
fr = 269.3 N
Explanation:
Let's use Newton's second law, for this it is good to see the attached diagram,
X axis
fr -F2 = 0
fr = F2
Y Axis
N-W = 0
We must include the rotation balance, place the rotation point at the bottom of the ladder and take the positive counterclockwise turns.
Σ τ = 0
F2 x -W y / 2 = 0
We look for x and y with trigonometry
sin 70 = y / L
cos 70 = x / L
y = L sin70
x = L cos 70
We substitute and calculate F2
F2 L cos 70 = W L sin 70 / 2
F2 = mg/2 tan 70
F2 = 20 9.8/2 tan 70
F2 = 269.3 N
From the first equation (x axis)
fr = F2
fr = 269.3 N
The correct answer is option B. i.e. 60 ohm.
The diagram is attached.
Since all the resistances are attached in series.
Hence, the total resistance will be the sum of all resistances.
R_total = R_1+R_2+ R_3
= 10+20+30
= 60 ohms.
Therefore, option c is correct answer.
The diagram is attached.
Since all the resistances are attached in series.
Hence, the total resistance will be the sum of all resistances.
R_total = R_1+R_2+ R_3
= 10+20+30
= 60 ohms.
Therefore, option c is correct answer.