A mass of 5 kg sits at rest on an incline making an angle of 30° to the horizontal. If ?s = 0.7, what is the friction force on the block?
2
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The distance between one positive peak and the next positive peak of a wave is called _____
A. Frequency B. wavelength C. elasticity D. intensity
Two blocks of masses 30.0 kg and 8.0 kg are connected together by a light string and rest on a frictionless level surface. Attached to the 8.0-kg mass is another light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 0.60 m/s2 what is the tension in the connecting string between the blocks?
a. 23 N b. 37 N c. 18 N d. 4.8 N e. 50 N
A particle in a rigid box has a ground state energy of 4 MeV. What is the least energy this system can absorb?
A) 16 MeV B) 4 MeV C) 25 MeV D) 12 MeV E) 8 MeV
Astronomers have identified more and more black holes in recent years by using x-ray imaging. If black holes are supposed to be black and not emit light, where are the x rays coming from?