An 18-karat gold necklace is 75% gold by mass, 16% silver, and 9.0% copper. What is the mass, in grams, of the necklace if it contains 0.28oz of silver?

A curve of radius 78m is banked for design speed of 85km/h. If coeficient of static friction is 0.3[wet pavement]at what range of speeds can a car safelymake the curve?

What are properties of waffle batter as compared to the properties of waffles

In each case, lifting or pushing, why must you exert a force to move the object? Q1-2: How much more effort is required to lift or push two bricks or masses instead of just one?

An airplane is flying horizontally with speed 1000 km/h (280 m/s) when an engine falls off. Neglecting air resistance, assume that it takes 30 s for the engine to hit the ground. (a) Show that the altitude of the airplane is 4.4 km. (Use g = 9.

Your class decides to build a circuit to make a light bulb shine. When you are finished, you have a setup with wires, a light bulb and a battery. What role does the battery play in this circuit design? A) The battery works as the system's wires.

Calculate the wavelength and frequency of the radiation emitted by the electronic transition from the 10th to the 9th excited state of hydrogen.

An unknown fluid has a specific gravity of 0.750. What is the volume of 22.5 kg of this fluid? A. 10 L B. 20 L C. 30 L D. 40 L

What kind of tide is responsible for extreme tides

What does the speed of sound depend on? A. Medium that the sound travels through B. Acoustics C. Frequency of the sound D. Loudness of the sound

Which of these is not a source of the shock waves that lead to protostars?