"The rock has a downward acceleration of 9.8 m/s2" is the one among the following choices that explains the <span>rock’s acceleration at the instant that it reaches the top of its trajectory (where its velocity is momentarily zero). The correct option among all the options that are given in the question is option "D". </span>
Answer:
8.0 mm
Explanation:
Force of a spring is:
F = kx
where k is the spring constant and x is the displacement.
When the force is equal to Ben's weight:
mg = kx
(180 kg) (9.8 m/s²) = (220,000 N/m) x
x = 0.0080 m
The spring compresses 0.0080 m, or 8.0 mm.
The two nuclear forces are not responsible for this property.
Gravitational is far too weak to make a transformer work.
The answer is electromagnetic.
Answer:
I₂ = 25 W / m²
Explanation:
Intensity is defined as the relationship between power and area
I = P / A
the power emitted by the sun is constant
P = I A
for the two points of interest
I₁ A₁ = I₂ A₂
energy is distributed on the surface of a sphere
A = 4π R²
I₁ R₁² = I₂ R₂²
I₂ =
let's calculate
I₂ =
I₂ = 25 W / m²
The frictional force would be horizontal. If the 35.0 N force is also horizontal, those 2 forces would be in opposite directions. That would simplify the calculation. Since no mention is made of any angle, it is unlikely that the 35.0 N force is not horizontal.
Assuming that the 35.0 N force is horizontal, the net force is
35.0
N
−
2.90
N
=
32.1
N
.