What characteristic of light mostly relates to color?
A) frequency
B) amplitude
C) both of these
Answer: A
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Transformers: An ideal transformer with 120 turns in its secondary supplies 12 V at 220 mA to a toy train. The primary is connected across a 120-V wall outlet.(a) How many turns are in the primary?(b) What is the primary current?(c) What power is delivered by the wall outlet?
What will be an ideal response?
What do scientists mean by verifiable observations?
A) statements that a person can, in principle, verify for himself or herself B) statements that anyone would agree are obvious C) observations that can be interpreted in only one way D) observations that a model does not have to predict E) observations that support a scientific theory
Quasars are most common with red shifts
a. less than 0.1 b. less than 0.5 c. of about 2 d. greater than 6 e. greater than 8
An astronaut in a space suit is motionless in outer space. The propulsion unit strapped to her back ejects some gas with a velocity of 50 m/s. The astronaut recoils with a velocity of 1.0 m/s. If the mass of the astronaut and space suit after the gas is ejected is 120 kg, the mass of the gas ejected is
A. 1.0 kg. B. 1.9 kg. C. 2.4 kg. D. 3.00 kg. E. 3.6 kg.