Answer:
Option b.
Explanation:
Weight of skydiver = mass × acceleration due to gravity
= 113 × 9.81 N
= 1108.53 N
Now,
The weight is acting downwards and air resistance is acting upwards. So,
Net force = weight - air resistance
Net force = 1108.53 - 660
Net force = 448.53
Closest value is option b.
Answer:
Answer:
1.1 x 10^9 ohm metre
Explanation:
diameter = 1.5 mm
length, l = 5 cm
Potential difference, V = 9 V
current, i = 230 micro Ampere = 230 x 10^-6 A
radius, r = diameter / 2 = 1.5 / 2 = 0.75 x 10^-3 m
Let the resistivity is ρ.
Area of crossection
A = πr² = 3.14 x 0.75 x 0.75 x 10^-6 = 1.766 x 10^-6 m^2
Use Ohm's law to find the value of resistance
V = i x R
9 = 230 x 10^-6 x R
R = 39130.4 ohm
Use the formula for the resistance
ρ = 1.1 x 10^9 ohm metre
Explanation:
Answer:
1. 98 N
2. 51.0 m
Explanation:
masa 25 kg
velocidad 20 m/s
coeficiente de rozamiento .4
<u>Fuerza de rozamiento:</u>
mu * N, where mu = coeficiente de rozamiento, N = fuerza normal
Calcula N:
F = ma = 25 * -9.8 = -245 N
F rozamiento = mu * N = .4 * -245 = -98 N
<u>Espacio que recorrerá:</u>
F rozamiento = ma
-98 = 25a
a = -3.92 de-aceleración de la fuerza
vf = 0 m/s
vf = at + vi
0 = -3.92t + 20
t = 5.10 seg
x = 1/2 at^2 + vi*t
= 1/2 * -3.92 * 5.10^2 + 20*5.10
= 51.0 m
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