Does light speed up or slow down when it travels from air to liquid

What's the acceleration of a 10kg object being pushed to the right on a horizontal floor by a 10n force.?

The glow of fluorescent light bulb or a neon sign is caused by which state of matter

Assume you are a Medieval knight attacking a castle with a cannon. The ball leaves the cannon with a speed of 47.7 m/s. The barrel's angle with respect to the ground is 43.

A bullet of mass m = 10 gram strikes a ballistic pendulum of mass m=2.0 kg. the center of mass of the pendulum rises a vertical distance of h=12 cm. assuming the bullet remains embedded in the pendulum, calculate its initial speed.

Which of the following items does not use a wheel and axle? A. a doorknob B. a light bulb C. a faucet handle D. a clock with hands

Two persons are applying forces on two opposite sides of a moving cart. The cart still moves with the same speed in the same direction. What do you infer about the magnitudes and direction of the forces applied?

SI unit of mass and gravity

What is the difference between porosity and permeability

In the diagram below, the planets' relative distances from the Sun are shown. The sizes of the planets are not drawn to scale.

Should athletes be benched if their grades are too low, or should they be allowed to play anyway?