The critical angle at the boundary between a ruby and the air is 34.6º. Use this to calculate the refractive index of this ruby. Give your answer to

two decimal places.

A theory is A. an educated guess that has yet to be proven by experiment. B. a synthesis of a large collection of information including well-tested guesses. C. close agreement by competent observers of observations of the same phenomena. D.

What is the electric power used by an appliance if the current is 2 A and the voltage is 50 volts? Show work and include all units

Jack tries to place magnets on the door of his refrigerator. He observes that the magnets don't stick. He guesses that the door of the refrigerator is made of a nonmagnetic substance. What stage of scientific investigation does his guess represent?

Inertia is the resistance of an object to a change?

A wheelchair ramp needs to be 8 inches high how long does it have to be to have a mechanical advantage of 5

Acceleration is a scalar quantity true or false

Find a numerical value for rhoearth, the average density of the earth in kilograms per cubic meter. Use 6378km for the radius of the earth, G=6.67*10-11m3 / (kg⋅s2), and a value of g at the surface of 9.80m/s2.

The driver of a car traveling at 32 m/s applies the brakes and undergoes a constant deceleration of 2.25 m/s^2.

The ability of an object to vibrate by absorbing energy at its natural frequency is called?

A hurricane in the Gulf of Mexico to 15 hours to travel 360 kilometers. What is the average speed of this hurricane in kilometers per hour?