Why might it be difficult for Earth-like planets to form around Sun-like stars in the inner parts of the disk of our galaxy?
A) any stars would be sucked into the central supermassive black hole
B) there would be insufficient amounts of heavy elements
C) the stars would be packed together too densely for planets to be stable
D) there would be too much harmful radiation
D
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Refer to Figure 6-13 Block A has a mass of 5.00 kg, block B has a mass of 3.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the tension in the string connecting blocks B and C?
A. 20.6 N B. 13.7 N C. 38.3 N D. 25.5 N E. 34.3 N
For safety in climbing, a mountaineer uses a 50-m long nylon rope that is 1.0 cm in diameter. When supporting a 90-kg climber, the rope elongates 1.6 m. Find the Young's modulus for the rope material.
What will be an ideal response?
A long solenoid (1000 turns/m) carries a current of 25 mA and has an inside radius of 2.0 cm. A long wire which is parallel to and 4.0 cm from the axis of the solenoid carries a current of 6.0 A. What is the magnitude of the magnetic field at a point on the axis of the solenoid?
A. 51 ?T B. 61 ?T C. 43 ?T D. 81 ?T E. 1.4 ?T
What is the sum of 2.67 + 1.976 + 2.1 expressed to the correct number of significant figures?
A) 6.7 B) 6.75 C) 6.746 D) 6.7460