today's model of the atom looks different from the models that came before it. why has the model of the atom changed

Why does the sun pull more on planets than moons?

If the actual mechanical advantage of a machine is 4.2, and the input force is 10.0 N, what is the output force? 2.3 N 42 N 0.42 N 10 N

In which situation does physical activity move beyond the baseline level? A) walking a short distance B) jogging C) sleeping D) completing basic chores

Problem: An ice hockey player hits a puck of mass 0.15 kilograms with a force of 100 newtons in the horizontal direction.

A 0.05-kg starts from rest at a height of 0.95m. assuming no friction, what is the kinetic energy of the car when it reaches the bottom of the hill? (Assume g = 9.81 m/s)

Different constellations are visible at different times of the year because of A) the relative motion between earth and the sun B) the relative motion between earth and the moon C) the celestial equator D) the celestial sphere

Why does alternating current change direction 50 to 60 times per second?

Tony uses the device shown in the diagram to model how an electromagnet is used in his uncle's scrap metal yard.

A flight attendant pulls a 60.0 N flight bag a distance of 239.0 m along a level airport floor at a constant speed. A 21.0 N force is exerted on the bag at an angle of 66.0 degrees above the horizontal. How much work is done on the flight bag?

A girl throws a rock horizontally, with a velocity of 10 m/s, from a bridge. It falls 20 m to the water below. How far does the rock travel horizontally before striking the water?