A nearby galaxy has a radius of 4,000 million A.U. and rotates once every 800 million years. What is its mass in solar masses?

What will be an ideal response?


Using Kepler's third law, P2 = a3/(M + m), and using solar system units of years, AUs, and solar masses, the sum of the masses must be M + m = 1011 solar masses. The sum of the masses, in this case represents the total mass of the galaxy.

Physics & Space Science

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An air track cart with mass m and speed v moving along an air track collides with a stationary cart with a mass m/3. After the collision the first cart has a speed v/2. What is the speed of the second cart?

What will be an ideal response?

Physics & Space Science

Two slits separated by 0.10 mm are illuminated with green light (? = 540 nm). Calculate the distance (in cm) from the central bright-region to the fifth bright band if the screen is 1.0 m away.

A. 2.3 B. 2.5 C. 2.7 D. 2.1 E. 2.0

Physics & Space Science

The Coriolis effect is very important to the weather of Venus

Indicate whether the statement is true or false

Physics & Space Science

The speed of sound in air is a function of which one of the following?

a. wavelength c. temperature b. frequency d. amplitude

Physics & Space Science