Answer:
Check the explanation
Explanation:
To calculate weight when the mass is already known, make use of the formula weight = mass times gravitational acceleration. But kindly note that on the surface of the earth, gravitational acceleration is always 9.8 m/s^2, so simply plug in the mass and multiply it by 9.8 to get the weight in newtons.
Kindly check the attached image below to know the step by step explanation.
Answer:
TRUE
Explanation:
Personal protective equipment or gear help one to be visible hence operators of machines can notice someone thereby preventing an injury or accident. Besides, other PPEs which are put either on the nose or other body parts protect someone from direct exposure of chemicals which may have harmful effects,
Answer:
the diffusion coefficient at 900°C is D₂=8.9*10⁻¹⁸ m²/s
Explanation:
The dependence of the diffusion coefficient is similar to the dependence of chemical reaction rate with respect to temperature , where
D=D₀*e^(-Q/RT)
where
D₀= diffusion energy at T=∞
Q= activation energy
T= absolute temperature
D= diffusion coefficient at temperature T
R=ideal gas constant
for temperatures T₁ and T₂
D₁=D₀*e^(-Q/RT₁)
D₂=D₀*e^(-Q/RT₂)
dividing both equations and rearranging terms we get
D₂=D₁*e^[-Q/R(1/T₂-1/T₁)]
replacing values
D₂=D₁*e^[-Q/R(1/T₂-1/T₁)] = 1.3*10⁻²² m²/s*e^(-256,000 J/mol/8.314 J/(mol K)*(1/1073K-1/773K) = 8.9*10⁻¹⁸ m²/s