How Planck's constant was discovered?

A train traveling at 82.8 kilometers per hour is blowing its horn as it approaches you. The horn has a frequency of 312 Hz. Assume the speed of the sound is 331 m/s. What is the observed frequency of the horn? 335 Hz 312 Hz 292 Hz 412 Hz

What are the "three R's" that lessen human impact on the land?

Which best blocks X-ray particles and can therefore be observed more closely through the use of this technology? organs muscles fluids bones

8 - 12 28:45 Which of the following correctly ranks electromagnetic waves from lowest to highest wavelength? (starting from lowest on the left to highest on the right) a. Ultraviolet, green, red, Infrared b. Red, green, infrared, gamma C.

An open-pipe resonator has resonant frequencies are odd-numbered multiples of the fundamental. True or false Explain

Whats an example of projectile motion

The fact that the sun rises and sets at different times during the day depending on the time of year is an example of a data trend. True or False

What sample of matter is a single substance

What is a hydraulic machine and what is its purpose? Explain how a simple hydraulic machine performs work.

Is the muzzle velocity a scalar or vector quantity?