silicone rubber is used to make a cast of a tool mark.
In order to answer this, you can use this formula :
F = m.a
which means
a = F/m
a = 18N / 2kg
a = 9 N/kg or 9m/s2
hope this helps
If the atom is neutral, then the number of electrons will ALWAYS be the same as the number of protons (which is the atomic number), so in this case the number of protons is 16, and that make the number of electrons 16
B
when hurricanes hit land, it weakens them
Answer:
20 mm
Explanation:
First, we calculate the velocity with which the object is released.
So, elastic potential energy = kinetic energy
1/2kx² = 1/2mv²
v = √(k/m)x where k = spring constant = 2000 N/m, m = mass = 0.3 kg and x = 0.04 m
v = √(2000 N/m/0.3 kg)0.04 m
v = 81.65 × 0.04 m
v = 3.27 m/s
We then calculate its acceleration, a from
F = kx = ma
a = kx/m
= 2000 N/m × 0.04 m/0.3 kg = 266.67 m/s²
We now calculate the height, h moved from v² = u² + 2ah where u = initial velocity = 3.27 m/s, v = final velocity at height, h = 0 (since it will be stationary) a = -266.67 m/s² (since its velocity is decreasing)
v² = u² + 2ah
0 = (3.27 m/s)² + 2 ×-266.67h
-10.693 = -533.34h
h = -10.693/533.34 = 0.020 m = 20 mm