A 35.0 kg child swings on a rope with a length of 6.50 m that is hanging from a tree. At the bottom of the swing the child is moving at a speed of 4.20 m/s. What is the tension in the rope?
A. 95.0 N
B. 438 N
C. 343 N
D. 366 N
B. 438 N
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The polar vortex at the south pole of Venus is
A. a low-pressure, high-humidity storm, much like a hurricane on Earth. B. a region where cooler gases sink to the surface before moving back to the equatorial regions. C. a region of the atmosphere where the surface can be seen from orbit. D. a high-pressure zone with winds flowing away from its center.
What is TRUE of radio telescopes?
A) They have poorer angular resolution than a refractor. B) They have better angular resolution than a reflector. C) They are the smallest, most compact telescopes. D) They can only be used above the atmosphere. E) They are most sensitive to the opacity of the ozone layer.
Based on the definition of apparent brightness, which units are appropriate for its measurement?
A) watts B) joules C) watts per square meter D) Newtons
A point charge of 6.0 nC is placed at the center of a hollow spherical conductor (inner radius = 1.0 cm, outer radius = 2.0 cm) which has a net charge of ?4.0 nC. Determine the resulting charge density on the inner surface of the conducting sphere
a. +4.8 ?C/m2 b. ?4.8 ?C/m2 c. ?9.5 ?C/m2 d. +9.5 ?C/m2 e. ?8.0 ?C/m2