A charge of 50-?C is placed on the y axis at y = 3.0 cm and a 77-?C charge is placed on the x axis at x = 4.0 cm. If both charges are held fixed, what is the magnitude of the initial acceleration of an electron released from rest at the origin?
A. 1.2 × 1020 m/s2
B. 1.5 × 1020 m/s2
C. 1.0 × 1020 m/s2
D. 1.8 × 1020 m/s2
E. 2.0 × 1020 m/s2
Answer: A
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The star Vega has an apparent visual magnitude of 0.03 and the star HR 4374 has an apparent visual magnitude of 4.87 . It has been determined that both stars are at the same distance from Earth. What does this information tell us about the two stars?
a. Vega must be closer to Earth than HR 4374. b. Vega must be farther from Earth than HR 4374. c. Vega must produce less energy/second than HR 4374. d. Vega must produce more energy/second than HR 4374. e. Vega will appear fainter to us than HR 4374.
Spherical Mirrors: A concave spherical mirror with a radius of curvature of 20 cm creates a real image 30 cm from the mirror. How far is the object from the mirror?
A. 20 cm B. 15 cm C. 7.5 cm D. 5.0 cm
The diffusion constant for water in air is
How long would it take a water molecule to diffuse a distance of 10.0 meters?
A. 400 hours B. 450 hours C. 500 hours D. 580 hours E. 600 hours
A 75.0 kg ladder that is 3.00 m in length is placed against a wall at an angle theta. The center of gravity of the ladder is at a point 1.20 m from the base of the ladder. The coefficient of static friction at the base of the ladder is 0.800. There is no friction between the wall and the ladder. What is the vertical force of the ground on the ladder?
A. 625 N
B. 640 N
C. 735 N
D. 832 N
E. 900 N