What is the ideal mechanical advantage of a wedge with a length of 5 cm and a width of 1.5 cm?

During steady motion of a vehicle on a level road, the power delivered to thewheels is used to overcome aerodynamic drag and rolling resistance (the product of the rollingresistance coefficient and the weight of the vehicle), assuming that the friction at the bearingsof the wheels is negligible. Consider a car that has a total mass of 950 kg, a drag coefficient of0.32, a frontal area of 1.8 m2, and a rolling resistance coefficient of 0.04. The maximum powerthe engine can deliver to the wheels is 80 kW. Use the air density of 1.20 kg/m3.a. Determine the speed at which the rolling resistance is equal to the aerodynamic drag force.b. Determine the maximum speed of this car.

A worker is using a 4.0 m long steel bar as a lever to raise one side of a car off the road. The fulcrum is a large block of wood. The magnitude of the load force is $200 N. If the load arm is 0.40 m, calculate the magnitude of the effort force required to balance the load.

An athlete strengthens her leg and knee by doing "leg curls." While sitting on a bench with the leg initially bent at the knee, she supports a weight with the foot. She then slowly raises the foot and lower leg, with the upper leg held stationary. Find the tension in the quadriceps tendon for the position shown in the figure below. (Let w = 225 N, D = 44 cm and d = 5.5 cm.) Please help thank you