The electric field in a cathode ray tube is supposed to accelerate electrons from 0 to 1.60 × 10^7 m/s in a distance of 4.00 cm. What electric field is required? (me = 9.11 × 10^-31 kg and e = 1.60 × 10^-19 C)
a. 18,200 N/C
c. 36,400 N/C
b. 9110 N/C
d. 72,800 N/C
A
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In Bt corn, genetic material from a bacterium has been put into the corn itself. What consequences might ensue?
What will be an ideal response?
Why do we believe that most of the mass of the Milky Way is in the form of dark matter?
A) The orbital speeds of stars far from the galactic center are surprisingly high, suggesting that these stars are feeling gravitational effects from unseen matter in the halo. B) Theoretical models of galaxy formation suggest that a galaxy cannot form unless it has at least 10 times as much matter as we see in the Milky Way disk, suggesting that the halo is full of dark matter. C) Although dark matter emits no visible light, it can be seen with radio wavelengths, and such observations confirm that the halo is full of this material. D) Our view of distant galaxies is sometimes obscured by dark blotches in the sky, and we believe these blotches are dark matter located in the halo.
The observation that outer parts of galaxies rotate faster than the observable mass within their orbit can pull them implies that ________.
A. in time, galaxies will develop spiral arms B. the masses of galaxies are larger than their luminous mass C. all galaxies will eventually develop a bulge D. galaxies are unstable E. None of these choices is correct.
A uniform 120-lb beam is supported in a horizontal position by a pin and cable as shown in the figure. What is the magnitude of the force by the pin on the beam?
A. 94 lb B. 88 lb C. 63 lb D. 75 lb E. 150 lb