What is an accretion disk?
What will be an ideal response?
Matter falling on to a compact object retains angular momentum, giving it a disk shape. This region of falling matter accretes on to a small object and is called an accretion disk.
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The Doppler effect can reveal the rotation speed of a star by the splitting of the spectral lines
Indicate whether the statement is true or false
A pilot drops a bomb from a plane flying horizontally at a constant speed. When the bomb hits the ground, the horizontal location of the plane will
A) be in front of the bomb. B) be over the bomb. C) be behind the bomb.
An air-core inductor has 920 turns/m and an internal volume of 3.0 cm3 . What is its inductance?
a. 3.2 ?H b. 2.8 mH c. 0.35 H d. 32 ?H e. Insufficient information is given.
A large stratified brine/water pond has a surface temperature of 140ºF and air at 70ºF moves across the pond at 15 mph. Estimate the convective heat transfer at the pond surface per unit area.
What will be an ideal response?