Astronomers have discovered more planets around other stars than in our Solar System
Indicate whether the statement is true or false
TRUE
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A simply supported steel beam of length L 5 1.5 m and rectangu-lar cross section (h 5 75 mm, b 5 20 mm) carries a uniform load of q 5 48 kN/m that includes its own weight. The maximum transverse shear stress on the cross section at 0.25 m from the left support is approx-imately:
(A) 20 MPa
(B) 24 MPa
(C) 30 MPa
(D) 36 MPa
The Earth and Moon always keep the same side towards each other
Indicate whether the statement is true or false
An electron in a hydrogen atom makes a transition from the n = 3 to the n = 1 energy state. Determine the wavelength of the emitted photon (in nm)
a. 1006 b. 209 c. 306 d. 103 e. 821
Suppose you want to set up a simple pendulum with a period of 2.50 s. How long should it be
(a) on Earth, at a location where g = 9.80 m/s2? (b) on a planet where g is 5.00 times what it is on Earth?