The complete question is
What modifications did kepler make to copernicus’s model? check all that apply. planetary orbits are elliptical. planets closer to the sun move faster. planets spin in an epicycle while orbiting earth. venus has phases due to its orbiting of the sun. earth’s rotation causes the rising and setting of the sun.
Answer:
Planetary orbits are elliptical.
Planets closer to the Sun move faster.
Explanation:
The first option is based on the first law that states that the planets orbit the sun in ellipses, with the sun at one focus of the ellipse.
The second option is based on the third law that states that the square of the time of revolution about the sun is directly proportional to the cube of the mean radius of orbit of the planet.
Answer:
Alpha particles carry a positive charge, beta particles carry a negative charge, and gamma rays are neutral. An alpha particle is made up of two protons and two neutrons bound together. Beta particles are high energy electrons. Gamma rays are waves of electromagnetic energy, or photons
Momentum is expressed as the product of mass and the velocity of an object. It refers to the quantity of motion that an object possess. From the choices listed above the correct answer is option D, <span>9.5 x 10^2 kilograms*meters/seconds.
Momentum = m(v)
</span><span>Momentum = 75 kg (45 x 1000 / 3600 ) m/s
</span><span>Momentum = 950 kg m / s</span>
