When a car drives along a "washboard" road, the regular bumps cause the wheels to oscillate on the springs. (what actually oscillates is each axle assembly, comprising the axle and its two wheels.) find the speed of my car at which this oscillation resonates, given the following information:
(a) when four 80-kg men climb into my car, the body sinks by a couple of centimeters. use this to estimate the spring constant k of each of the four springs.
(b) if an axle assembly (axle plus two wheels) has total mass 50 kg, what is the natural frequency of the assembly oscillating on its two springs?
(c) if the bumps on a road are 80 cm apart, at about what speed would these oscillations go into resonance?
when the car starts moving it acquires kinetic energy.
for this problem the formula of kinetic energy is:
where m is the mass of the car = 850kg, and v is the speed of the car.
if we consider insignificant the energy lost by friction with soil and air we can propose the following equation:
applied energy = kinetic energy acquired by the car.
the velocity is 5.531 m/s
mechanical advantage is the ratio of the output force to the input force, so it can be represented by the equation: note that this equation represents the actual mechanical advantage of a machine. the actual mechanical advantage takes into account the amount of the input force that is used to overcome friction.
fossil fuels is used the most often in the world.