How did Kepler improve on Copernicus's model?

Using the periodic table, explain the difference between hydrogen, deuterium, and tritium-I. e. hydrogen-1 and hydrogen-3

The diagram shows a 15-kg box resting on a wedge which has an angle of inclination of 30° and a coefficient of friction of 0.15. Find the value of the vector Fg.

A duck with a mass of 0.90 kilograms flies at a rate of 12.0 m/s. What is the kinetic energy of the duck? 130 J 5.4 J 65 J 11 J

A car travels at uniform velocity a distance of 100 meters in 4 seconds. What is the velocity of the car

pitot tube on an airplane flying at a standard sea level reads 1.07 x 105 N/m2. What is the velocity of the airplane?

A mechanic pushes a 3.60 ✕ 103-kg car from rest to a speed of v, doing 5,130 j of work in the process. during this time, the car moves 21.0 m. neglecting friction between car and road, find v and the horizontal force exerted on the car.

Anika asks Eva to roll a basketball and then a bowling ball to her. Which requires more force to roll, and why?

Why does a buoyant force act on every object in a fluid? Pressure pushing up on the bottom of the object is greater than the pressure pushing down on the top.

Give a sentence with the word velocity in it

Which description matches up correctly with each type of particle? Alpha - no mass and no charge; beta - mass of 4 and charge of + 2; gamma - charge of - 1 and mass of 0 Alpha - mass of 0 and charge of - 1; beta - mass of 4 and charge of + 2;