Acar is traveling on a freeway onramp at 25 mph. the pavement's coefficient of road adhesion is 0.80. the car has cd 0.40, a,-20.5 ft, and w 2200 lb. the wheelbase is 130 inches, and the center of gravity is 20 inches above the roadway surface and 50 inches behind the front axle. the air density is 0.002045 slugs/ft3. the car's engine is producing 80 ft- lb of torque and is in a gear that gives an overall gear reduction ratio of 3 to 1, the wheel radius is 14 inches, and the mechanical efficiency of the drivetrain is 80%. if the speed limit on the freeway is 70 mph, calculate the required length of the acceleration lane.

Answer: a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same sign as the  -4.0  µc charge.======electricstatic force between two point charges  is given by    where k is coulomb's constant,  8.99×10⁹  n·m²/c², q₁ and q₂ are the point charges, and r is the distance between the two point charges.assign positive to q₁let q₁ =  6.0 µc, q₂ = -4.0  µc, q₀ represent the charge at the origin, and q₃ represent this new charge to place.the charge at the origin q₀ would experience the following force f₀₁ from q₁, with r = 6.0 m (note that 1  µc = 10⁻⁶ c)    the force from q₂    the force from q₃    the net force on the origin charge, q₀, has to be zero for no electrostatic forcehaving an equation where k and q₀ can be divided out of the equation will allow us to solve for q₃    isolating:     a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same as the  -4.0  µc charge