A. The formula for mean free time is:
t = V/(4π√2 r²vN)
where
N = 1×10¹⁶ molecules (per m³)
V = 1 m³
r = 111×10⁻⁷m (atomic radius of silicon)
Let's solve for v first:
v = √(3RT/M) = √(3(8.314 m³·Pa/mol·K)(25 + 273 K)/28.1 g/mol Si)
v = 16.26 m/s
t = (1 m³)/(4π√2 (111×10⁻⁷m)²(16.26 m/s)(1×10¹⁶ molecules))
<em>t = 2.81×10⁻9 s</em>
<em>Pure silicon has a high resistivity relative to copper because copper is a conductor, while silicon is a semi-conductor. </em>
Answer:
39,000 Joules of Work
Explanation:
Work can be found out through the change in Kinetic Energy.
W = ΔKE
Change in KE is:
Expand the equation you get:
Plugin the known values and solve:
Momentum = mass * velocity
Momentum = 70 * 21
Momentum = 1,470
Therefore, Bernie’s momentum was 1,470kg*m/s as he leaves the ski jump. :)
Answer and Explanation: When tossing a ball up in the air, the forces acting on the ball are due to Gravity, which is defined by gravitational acceleration on that location on Earth (approximately 9.8 m/s²) multiplied by mass of the ball; Force of thrown, i.e., the force you threw the ball and air resistance force, which is proportional to the square of the ball's through the air and the ball's cross section area. To facilite calculations, air resistance force is normally ignored.
Answer:
a = -3.9m/s²
Explanation:
Given the following data;
Initial velocity = 66m/s
Displacement = 560m
To find the acceleration, we would use the third equation of motion
V² = U² + 2aS
Substituting into the equation we have
0² = 66² + 2*a*560
0 = 4356 + 1120a
-1120a = 4356
a = - 4356/1120
a = -3.9m/s²