Which law best describes why the planets are pulled toward the sun and orbit it? a) newton's law of universal gravitation b) kepler's law of ellipses c) newton's second law of motion d) newtons third law of motion

Acricket ball of 70g moving with a velocity of 0.5 m/s is stopped by a player in 0.5s what is the force applied to stop the ball

Hydrogen atoms are excited by a laser to the =4n=4 state and then allowed to emit. what is the maximum number of distinct emission spectral lines (lines of different wavelengths) that can be observed from this system? 8 6 2 7 4 5 1 3 calculate the wavelength of the 4⟶14⟶1 transition. =λ=

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap