Answer:
2780 meters
Explanation:
First, convert km/hr to m/s.
87.1 km/hr × (1000 m / km) × (1 hr / 3600 s) = 24.2 m/s
160.0 km/hr × (1000 m / km) × (1 hr / 3600 s) = 44.4 m/s
Given:
v₀ = 24.2 m/s
v = 44.4 m/s
a = 0.250 m/s²
Find: x
v² = v₀² + 2a (x − x₀)
(44.4 m/s)² = (24.2 m/s)² + 2(0.250 m/s²) (x − 0 m)
x = 2780 m
Answer: 94.9 metres
Explanation:
Given that,
Force between the two charges (F) = 24x10² N
Negative charge (q1) = 8x10-5C
Positive charge (q2) = 3x10C
Distance between charges (r) = ?
Apply the formula for
F= (kq1q2) / r²
Recall that k is Coulomb's constant with a value of 9 × 10^9 Nm2C−2
Then,
24x10² N = (9 × 10^9 Nm2C−2 x 8x10-5C x 3x10C) / r²
24x10² N = (2.16 x 10^7) / r²
r² = (2.16 x 10^7 / 24x10² N)
r² = 9000
To get the value of r, find the square root
r = √9000
r = 94.868m (rounded to the nearest tenth as 94.9m)
Thus, a distance of 94.9 metres separates the charges.
False , the crests do not meet up along the medium