Which of the following is made from a Crystaline solid that conducts a current only under certain circumstances?

•vacuum tube

•cathode-ray tube

•analog device

•semiconductor

A 10 kg cart with a momentum of 10 kg• m/s hits a 20 kg cart at rest. Momentum is calculated by using the formula p = mv, where m is the mass of an object and vis the velocity of an object.

The speed of light in a certain medium is 61.2% of the speed of light in vacuum. What is the index of refraction of the medium?

What is the term when a tennis game is tied at 40-40?

7.) A car starts from rest and accelerates uniformly at 1.7 m/s/s. How long will it take the car to reach a speed of 34 m/s? A 200 s B 58 s C 20 s D2 s

At last, it's time to go diving! You load your stuff into the boat and head to an offshore dive site. A. What type of device does the boat use to move? Describe this in terms of the laws of thermodynamics.

What type of energy is formed when chemical bonds are broken? A. Chemical energy B. Thermal energy C. Radiant energy D. Light energy

The liquid contained in batteries that conducts electric charge is called the: solution, electrolyte, suspension, colloid

Someone jumped from a high altitude at 31,000m above the earth. he freefalled for 4 min and 36 secs with top speed of 988 mph

What does the law of reflection mean?

Compared with the peak wavelength given off by the sun, what is the peak wavelength given off by a hotter star? A.) shorter in wavelength and higher in energy B.) shorter in wavelength and lower in energy C.