To keep chickens warm in a shed on a cold night, it is best to use
A) an incandescent lamp.
B) a fluorescent lamp.
C) an LED lamp.
D) a CFL lamp.
Answer: A
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Consider a particle with mass m. As its speed approaches the speed of light, its relativistic momentum magnitude
approaches:
A. infinity B. mc C. m D. zero
What makes us think that the star system Cygnus X-1 contains a black hole?
A) It emits X-rays characteristic of an accretion disk, but the unseen star in the system is too massive to be a neutron star. B) No light is emitted from this star system, so it must contain a black hole. C) The fact that we see strong X-ray emission tells us that the system must contain a black hole. D) Cygnus X-1 is a powerful X-ray burster, so it must contain a black hole.
A space vehicle accelerates uniformly from 65 m/s at t = 0 to 162 m/s at t = 10.0 s. How far did it move between t = 2.0 s and t = 6.0 s?
What will be an ideal response?
How much heat is needed to raise the temperature of 200 g of lead (c = 0.11 kcal/kg ? °C) by 10 C°?
A) 33.0 cal B) 330 cal C) 2000 cal D) 20 kcal