The leading explanation for the existence of spiral arms are: Group of answer choices shock waves from cyclic supernovae explosions. shock wave from the quasar-like eruption of the galactic core. tidal streams of small galaxies being torn up by our monster Galaxy. passages of massive globular clusters through the galactic plane. passages of spiral density waves through the interstellar medium.

According to newton's second law, when the same force is applied to two objects of different masses, a the object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration, b. the object with greater mass will experience a smaller acceleration, and the object with less mass will experience a greater acceleration, c. the object with greater mass will experience a greater acceleration, and the object with less mass will experience a smaller acceleration, d. the object with greater mass will experience a small acceleration, and the object with less mass will experience an even smaller acceleration.

A26 cm object is 18 cm in front of a plane mirror. a ray of light strikes the object and is reflected off the mirror at a 42-degree angle. what is the angle of reflection? degrees what type of image is formed? what is the size of the image? cm

What is a possible result of higher air temperature caused by global warming