Based on the above graph, the average time between maximums of the sunspot cycle is about
A) 110 years.
B) 11 years.
C) 1 year.
D) a few months.
B) 11 years.
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I use a rope 1.00-m-long to swing a 1.00-kg weight around my head. The tension in the rope is 20.0 N. In half a revolution how much work is done by the rope on the weight?
a. 20.0 J
b. 31.4 J
c. 123 J
d. 0
The momentum of a photon is inversely proportional to its total energy
Indicate whether the statement is true or false
A airplane having a metal surface and a wingspan of 25.0 m flies horizontally at 200. m/s where the earth's magnetic field is vertical with magnitude 45.0 ?T
(a) What emf is induced across the wings? (b) What wingspan would the plane need to produce 1.00-V emf across its wings? (c) The plane now reverses direction. Does the polarity of the wingtip emf change? That is, if the left wing was positive before, does it now become negative?
One difference between a microscope and a telescope is that the image formed by the objective is
A. real for the microscope but virtual for the telescope. B. virtual for the microscope but real for the telescope. C. real for both, but the image is enlarged for the microscope and reduced for the telescope. D. real for both, but the image is reduced for the microscope and enlarged for the telescope.