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What tractive effort is required to keep semi-trailer

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A 24 tonne semi-trailer is travelling up a hill with gradient 8 degree at a speed of 70kph. It has a frontal area of 5 square meters and the coefficient of rolling resistance and drag are 0.015 and 0.8, respectively. Assuming air density is 1.25kg/m3 and gravitational acceleration is 9.8m/s2. What tractive effort ( in kN to 1 decimal place) is required to keep the semi- trailer at a constant 70 kph up the hill?

Reference no: EM133462162

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