Steven Weinberg, Abdus Salam, and Sheldon Glashow shared the 1979 Nobel prize in physics for their development of __________
Fill in the blank(s) with correct word
electroweak theory
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Brown dwarfs have high luminosities
Indicate whether the statement is true or false
An 0.80-kg block is held in place against the spring by a 67-N horizontal external force (see the figure). The external force is removed, and the block is projected with a velocity v1 = 1.2 m/s upon separation from the spring
The block descends a ramp and has a velocity v2 = 1.9 m/s at the bottom. The track is frictionless between points A and B. The block enters a rough section at B, extending to E. The coefficient of kinetic friction over this section is 0.39. The velocity of the block is v3 = 1.4 m/s at C. The block moves on to D, where it stops. The spring constant of the spring is closest to A) 3900 N/m. B) 2600 N/m. C) 2000 N/m. D) 1600 N/m. E) 1100 N/m.
Why do scientists think that our solar system must have formed sometime after nearby supernovae explosions?
A) existence of heavy elements B) solar temperature too low C) our Sun is a G-type star D) They don't—scientists believe our Sun is among the first generation of stars.
A solid nonconducting sphere (radius = 12 cm) has a charge of uniform density (30 nC/m3) distributed throughout its volume. Determine the magnitude of the electric field 15 cm from the center of the sphere
a. 22 N/C b. 49 N/C c. 31 N/C d. 87 N/C e. 26 N/C