Which shape best describes how stars look when seen through a telescope?
a. five-point star b. disk
c. point d. seven-point star
c
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Thermodynamic Processes: The figure shows a pV diagram for 8.3 g of ideal nitrogen gas N2 in a sealed container. The temperature of state 1 is 59°C, the atomic mass of the nitrogen atom is 14 g/mol, and R = 8.31 J/mol ? K. What are (a) pressure p1 and (b) temperature T2?
A. (a) 81 atm, (b) 660°C B. (a) 14 atm, (b) 660°C C. (a) 81 atm, (b) 120°C D. (a) 14 atm, (b) 120°C
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
A rectangular loop of wire measures 1.0 m by 1.0 cm. If a 7.0-A current flows through the wire, what is the magnitude of the magnetic force on the centermost 1.0-cm segment of the 1.0-m side of the loop? (?0 = 4? × 10-7 T • m/
A) A) 9.8 × 10-6 N B) 7.8 × 10-7 N C) 9.8 × 10-8 N D) 4.9 × 10-6 N
A 2.0-?F capacitor is charged to 12 V and then discharged through a 4.0-M? resistor. How long will it take for the voltage across the capacitor to drop to 3.0 V?
A) 22 s B) 11 s C) 24 s D) 8.0 s