It would be "Researchers found environmental safe replacements for CFC's"
Answer:
r =
Explanation:
Let's apply the universal gravitation law to the body (c), we use the indications 1 for the planet and 2 for the moon
∑ F = 0
-F_{1c} + F_{2c} = 0
F_{1c} = F_{2c}
let's write the force equations
where d is the distance between the planet and the moon.
(d-r)² =
d² - 2rd + r² = \frac{m}{M} \ \ r^2
d² - 2rd + r² (1 - ) = 0
(1 - ) r² - 2d r + d² = 0
we solve the second degree equation
r = [2d ± ] / 2 (1- )
r = [2d ± 2d ] / 2d (1- )
r =
there are two points for which the gravitational force is zero
Answer:
Explanation:
The cross sectional area of the hole can be find using
Δ
Steel coefficient
replacing to find A
Answer:
E = 7.70 × 10⁻²⁸ J
Explanation:
Energy = hf
h = Planck's constant = 6.63 × 10⁻³⁴ J.s
f = frequency = 1160 KHz = 1.16 × 10⁶ Hz
E = (6.63 × 10⁻³⁴ × 1.16 × 10⁶)
E = 7.70 × 10⁻²⁸ J