A 0.200-m wire is moved parallel to a 0.500-T magnetic field at a speed of 6.00 m/s. What emf is induced across the ends of the wire?
a. 1.00 V
c. 2.25 V
b. 0.600 V
d. zero
D
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Which of the following provides direct evidence that the chemical building blocks of life (such as amino acids and DNA bases) could have formed naturally under the conditions that were present on the early Earth?
A) Fossil remains of life date to fairly early in Earth's history. B) These chemicals have been formed in laboratory experiments that recreate conditions of the early Earth. C) DNA studies show that all known life on Earth evolved from a common ancestor. D) We have found evidence of complex carbon molecules on Saturn's moon Titan.
Water is flowing through a pipe whose cross sectional area at point A is larger than the cross sectional area at point B. The reading on a pressure gauge connected to the pipe at point A will be __________ the reading on a pressure gauge connected to the pipe at point B
Fill in the blank(s) with correct word
A step-up transformer that doubles the input voltage is designed to work with an input voltage that varies at 60 Hz. The frequency with which the output voltage varies is ________ Hz.
Fill in the blank(s) with the appropriate word(s).
A 2.5 cm sphere is maintained at 50°C in either an air stream or a water stream, both at 20°C and 2 m/s velocity. Compare the rate of heat transfer and the drag on the sphere for both fluids.
GIVEN
• A sphere in an air stream or a water stream
• Sphere diameter (D) = 2.5 cm = 0.025 m
• Sphere temperature (Ts) = 50°C
• Fluid temperature (Tf) = 20°C
• Fluid velocity (U?) = 2 m/s FIND
• The rate of heat transfer (q) and the drag force
ASSUMPTIONS
• Radiation is negligible
SKETCH
PROPERTIES AND CONSTANTS
