Which element, represented by x, reacts with fluorine to produce the compound xf2? (1) aluminum (3) calcium (2) argon (4) sodium

A 90.00-kg hockey goalie, at rest in front of the goal, stops a puck (m = 0.16 kg) that is traveling at 30.00 m/s. at what speed do the goalie and puck travel after the save?

What do cell phones require to work? A. The GPS system B. Ultraviolet rays C. A cellular system D. X-rays

Air masses are identified on the basis of temperature and

Green light can have a wavelength of 543 nm. the energy of a photon of this light is

Question 11 1 pts Nuclear power plants rely on to generate power. O climate change O fusion Ofission O coal

A spring with a spring constant of 1200 N/m has a 55-g ball at its end. The energy of the system is 5.5J. What is the amplitude of vibration?

Force F1 acts on a particle and does work W1. Force F2 acts simultaneously on the particle and does work W2. The speed of the particle does not change. Which one of the following must be true? a. W1 is zero, and W2 is positiveb. W1 = - W2c.

The amplitude of a sound is the Group of answer choices frequency of the sound. magnitude of displacement of a sound pressure wave. psychological aspect of sound related to timbre. amount of sound energy falling on a unit area.

Air at 38°C and 97% relative humidity is to be cooled to 18°C and fed into a plant area at a rate of 510 m/min. a. Calculate the rate (kg/min) at which water condenses. b.

a 7.26kg bowling ball (16 pounds) is at rest at the end of the bowling lane. : how long did you push the ball in this situation