A +7.00 ?C point charge and -9.00 ?C point charge are placed along the x-axis at x = 0.000 cm and x = 40.0 cm, respectively
Where must a third charge, q, be placed along the x-axis so that it does not experience any net electric force due to the other two charges?
A) -0.200 m
B) 2.99 m
C) -0.187 m
D) -2.99 m
E) 0.187 m
D
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Which of the following statements best reflects our current knowledge about the term flife in the equation
Number of Civilizations = NHP × flife × fcivilization × fnow? A) The value of flife is either 0 or 1, but not anything in between. B) The value of flife is between 0 and 1. C) The value of flife is less than 0.0000001. D) The value of flife is equal to 1/2. E) The value of flife is greater than 0.9.
Regions of Earth where the Sun is more directly overhead will experience ________.
A. colder weather B. warmer weather C. more eclipses D. longer nights E. None of these choices is correct.
A 10-g bullet moving horizontally with a speed of 1.8 km/s strikes and passes through a 5.0-kg block initially at rest on a horizontal frictionless surface. The bullet emerges from the block with a speed of 1.0 km/s. What is the kinetic energy of the block immediately after the bullet emerges?
a. 8.0 J b. 6.4 J c. 5.3 J d. 9.4 J e. 10 J
Some species of whales can dive to depths of one kilometer. What is the total pressure they experience at this depth? (rsea = 1 020 kg/m3 and 1.01 × 10^5 N/m2 = 1 ATM.)
a. 9.00 ATM b. 90.0 ATM c. 100 ATM d. 111 ATM e. 130 ATM