Gold is called noble gas why

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When you push with a horizontal 15-N force on a book that slides at constant velocity, the force of friction on the book is A. Slightly more than 15 N B. 0N C. Slightly less than 15 N D. 15 N

For using the law of reflection and Snell's law for refraction, the angles are measured Group of answer choices between the surface and the light ray between the normal to the surface and the light ray either way of measuring the angle will work for

A sound wave in the air has a frequency of 680 cycles per second. What is the approximate wavelength of the sound wave

How does lubricating a machine affect the output work from that machine? how would the input and output forces be affected?

A box is lowered using a rope. If the acceleration of the box, is 2.5 m/s2 (downward) and the tension in the rope is 31 N, what is the mass of the box (in kg) ?

On a very hot summer day, the rooms on the first floor of a house stay cooler than the rooms on the second. Which form of thermal energy flow causes this to occur? A) Conduction B) Convection C) Kinetic D) Radiation

What is a ion in science?

I'm a bit confused A basketball is thrown upwards. The height f (t), in feet, of the basketball at time t, in seconds, is given by the following function: f (t) =

A rod made up of a single element is used to heat water using electricity. To which group does this element probably belong to?