The car moves evenly at a speed of 72 km per hour. What work does it do in 10 seconds if the thrust force of its motor is 2000H?
| February 23, 2021 | education
v = 72 km / h = (72 * 1000 m) / 3600 s = 20 m / s;
t = 10 s;
F = 2000 H;
A -?
To find the work that the machine does, we use the formula A = F * s, where F is the traction force, s is the distance traveled. Since s = v * t, then A = F * v * t.
Substitute the known values into the formula and calculate the work.
A = 2000 N * 20 m / s * 10 s = 400000 J = 400 kJ.
Answer: the machine performs work equal to 400 kJ.
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