A__________is a type of active galaxy nucleus that is especially variable and has few or no spectral emission lines
A) blazar
B) pulsar
C) quasar
D) quark
A
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A wooden block A of mass 4.0 kg slides on a frictionless table when pulled using a massless string and pulley array by a hanging box B of mass 5.0 kg, as shown in the figure
What is the acceleration of block A as it slides on the frictionless table? Hint: Think carefully about the acceleration constraint. A) 4.1 m/s2 B) 3.5 m/s2 C) 3.1 m/s2 D) 2.7 m/s2
Consider the following processes: The temperature of two identical gases are increased from the same initial temperature to the same final temperature. Reversible processes are used. For gas A the process is carried out at constant volume while for gas B it is carried out at constant pressure. The change in entropy:
A. is the same for A and B B. is greater for A C. is greater for B D. is greater for A only if the initial temperature is low E. is greater for A only if the initial temperature is high
Computer simulations and the huge structures observed in the universe support the ________ model of the universe
Fill in the blank(s) with correct word
In x-ray machines, electrons are subjected to electric fields as great as 4.0 × 10^5 N/C. Find an electron's acceleration in this field. (me = 9.11 × 10^-31 kg, e = 1.6 × 10^-19 C)
a. 1.1 × 10^17 m/s2 c. 3.6 × 10^8 m/s2 b. 7.0 × 10^16 m/s2 d. 4.6 × 10^10 m/s2