When does light refract?

when it travels through gases

when it crosses the boundary between two types of material

Light refracts every 2000 wavelengths.

when it travels through a vacuum

What force is need to give 4.5-kg bowling ball an acceleration of 9 m/s2? a. 0.5 N b. 40.5 N c. 2 N d. 36.5 N

A 75-hp (shaft output) motor that has an efficiency of 91.0 percent is worn out and is to be replaced by a high - efficiency motor that has an efficiency of 95.4 percent. the motor operates 4368 hours a year at a load factor of 0.75.

The following three hot samples have the same temperature. The same amount of heat is removed from each sample. Which one experiences the smallest drop in temperature, and which one experiences the largest drop?

Two identical capacitors are arranged in a circuit. What is the ratio of the equivalent capacitance of the circuit when the capacitors are in series to that when they are in parallel?

On an ice skating rink, a girl of mass 50 kg stands stationary, face to face with a boy of mass 80 kg. The children push off of one another, and the boy moves away with a velocity of + 3 m/s. What is the final velocity of the girl?

An example of objects the move in revolution

How many hops does a kangoroo do in 1 day

What are the average velocity and average acceleration of the tip of a 2.4 cm long hour hand of a clock?

What is the number one and most important rule to remember in soccer?

Why are convection currents; why are they hotter and colder parts of earth