For Cepheid Variable stars, what property of those stars can be observed that reveal its TRUE brightness (which can then be used to calculate distance) ?

Would it be faster for you to travel from planet to planet within a solar system, from star to star within a galaxy, or from galaxy to galaxy within the universe? Explain.

A light string is wrapped around the edge of the smaller disk, and a 1.50 kg block is suspended from the free end of the string. If the block is released from rest at a distance of 2.

A hot air balloon is rising vertically with a velocity of 10.0 feet per second. A very small ball is released from the hot air balloon at the instant when it is 960 feet above the ground. Use a (t) = -32 ft/sec2 as the acceleration due to gravity. 1.

What happens when waves encounter a medium that they cannot travel through

Which of these is outside of the solar system? A. Sun B. Galaxy C. Saturn D. Moon

A baseball player is warming up and tosses a ball straight up into the air. The ball travels up until it reaches some maximum height, and then falls back down to the player/'s hand.

Volume can be measured in liters or cubic meters. a. T b. F

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.