To a fish, the 4.20 mm thick aquarium walls appear to be only 3.80 mm thick. What is the index of refraction of the walls?

A wind-up car has a mass of 0.40 kg. The wind-up car is accelerating at 0.40 m/s2. What is the net force acting on the wind-up car?

What do all elements in the same period on the periodic table have in common? a. They have the same number of electrons. b. They have the same number of protons. c. They have the same number of neutrons. d. They have the same number of orbitals.

Which claim about the forces acting on the horse must be true? Choose 1 answer: Choose 1 answer: (Choice A) A There is not enough information. (Choice B) B There is no net force on the horse. (Choice C) C There is a net force on the horse.

A force of 12n acts on a 2.0 - kg through a parallel distance of 1.5 how much work is done on the object

Which describes Einstein's second postulate about the special theory of relativity? 1. The speed of light in a vacuum is constant, and nothing is faster than the speed of light. 2.

A 25kg object moves from left to right at a speed of 30km/h. What net force is required to keep this object moving in a straight line at constant speed

Ganymede is one of the many moons of jupiter. it is nearly a sperical in shape. it is larger than the planet mercury and slightly smaller than the planet mars.

Which of the following statements about two carts rolling on a track and experiencing a completely inelastic collision is TRUE? a. The kinetic energy of the system is conserved to good approximation. b.

If element X has 17 protons, how many electrons does it have?

A 2.0-kilogram laboratory cart is sliding across a horizontal frictionless surface at a constant velocity of 4.0 meters per second east. What will be the cart's velocity after a 6.0-newton westward force acts on it for 2.