State Kirchhoff's junction theorem
What will be an ideal response?
The algebraic sum of the currents at any junction is zero.
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Poor clusters
a. contain more than 1000 stars and are found in the halo of the galaxy. b. contain lots of young stars and are found in the disk of a spiral galaxy. c. contain more than 1000 galaxies and are generally elliptical in shape. d. contain fewer than 1000 galaxies and tend to be irregularly shaped. e. are found in the nucleus of the galaxy.
Banked Curves: A highway curve of radius 80 m is banked at 45°. Suppose that an ice storm hits, and the curve is effectively frictionless. What is the speed with which to take the curve without tending to slide either up or down the surface of the road?
A. 9.4 m/s B. 28 m/s C. 780 m/s D. The curve cannot be taken safely at any speed.
In order to slide a 70.0 kg box across the floor at a constant speed, you must push horizontally with a force of 351 N. What is the coefficient of kinetic friction?
A. 0.149 B. 0.584 C. 0.337 D. 0.512 E. 0.678
What evidence do we have that life arose quickly?
What will be an ideal response?