How have physicists played a role in history?

A. Physics has changed the course of the world.

B. History books are written by physicists.

C. Physicists have controlled most governments.

D. Most decisions about wars are made by physicists.

What is the velocity of a wave with a frequency of 6 Hz and a wavelength of 2 m?

Organisms must have variation within a population in order for natural selection to occur. Which situation is an example of this variation?

When an 81.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.25 103 j. by how much does the potential energy of a (n) 17.

An atom has an atomic number of 12 and a mass number of 0.25. How many neutrons does the atom have?

Sally and Ramona were competing in a four-lap, one-mile foot race. Sally's style was to run at a constant rate of 12 mph.

Imagine a particular exoplanet covered in an ocean of liquid methane. At the surface of the ocean, the acceleration of gravity is 6.20 m/s2, and atmospheric pressure is 7.00 ✕ 104 Pa.

Explain what surface tension is.

A helium-filled balloon is launched when the temperature at ground level is 27.8°c and the barometer reads 752 mmhg. if the balloon's volume at launch is 9.47 * 10^{4} 4 l, what is the volume in liters at a height of 36 km, where the pressure is 73.

Consider the moment when the spring is at its maximum compression. At that moment, the kinetic energy, the gravitational potential energy, and the elastic potential energy are, respectively, a - zero, at a maximum, and at a maximum b - at a maximum,

Ari, a young patient who is regularly treated by a psychiatrist, feels compelled to carry out repetitive tasks the same way very frequently. If Ari does not conduct these tasks with extreme precision, he can feel extremely nervous and uncomfortable.