Answer:
80%
Explanation:
Thermal efficiency is a measure of the extent to which a heat engine is able to convert to other form. It is measure in percentage.
Thermal efficiency = 
× 100%
Where 
is the input energy and 
is the output energy.
Given that: = 2400 J and = 3000 J, therefore:
Thermal efficiency = 
× 100%
= 80%
The thermal efficiency of the engine is 80%.
<span>A car with a mass of 1500kg starts from rest and accelerates to a speed of 18m/s in 12s. Assume that the force of resistance remains contant at 400N during</span>
Answer:
The angle of launch is 52.49 Degree.
Explanation:
The Range R and Height H of a thrown object is calculated using the formula,
R=V₀² sin(2φ)/g
H=V₀²sin²(φ)/g
From these equations it can be written,
V₀²=R g/ sin(2φ)
V₀²=H g/ sin²(φ)
These values are equal so it can be written by equating these equations,
R g/sin(2φ)=H g/sin²(φ)
tan(φ)= 2H/R
Given H=72.3 m and R=111 m, the angle of launch is,
tan(φ)= 2*72.3/111
φ= 52.49 Degree.
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Electrons carry a negative charge.
Answer:
480 mL
Explanation:
Ideal gas law states:
PV = nRT
At constant pressure, nR/P is constant. Therefore:
V / T = V / T
420 mL / 220 K = V / 250 K
V ≈ 480 mL
