1. a car with a mass of 1,500 kilograms is moving around a circular curve at a uniform velocity of 16 m/s. the curve has a radius of 100 meters. what's the centripetal force on the car? 2. a car with a mass of 1,200 kg is moving around a circular curve at a uniform velocity of 20 m/s. the centripetal force on the car is 6,000 n. what's the radius of the curve? write your answers using 1–2 paragraphs. 3. describe the universal gravitational law. 4. evaluate the techniques and models used by ptolemy and copernicus to explain the setup of the universe.

Answers

1)  3,840 N

2) 80 m

Explanations

Centripetal force is the force that maintenance objects that are moving in a circular motion.

F = mv²/r

  = (1500 × 16²)/100

   = (1500×256)/100

     = 384000/100

     = 3,840 N

2) F = (mv²)/r

       6000 N = (1200 × 20²)/r

r = (1200 × 400)/6000

   = 480,000/6000

     = 80 m

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.