Two identical small charged spheres are a certain distance apart, and there is an electrostatic force of magnitude F that they exert on each other. With time, charge gradually diminishes on both spheres by leaking off
When each of the spheres has lost half its initial charge, what will be the magnitude of the electrostatic force exerted on each one? A) 1/16 F
B) 1/8 F
C) 1/4 F
D) 1/2 F
E) 1/ F
C
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Newton's Second Law in 1 Dimension: The figure shows an acceleration-versus-force graph for a 125-g object. What should be the value of the first tick-mark on the vertical scale, as indicated by the arrow in the figure?
A. 4 B. 8 C. 0.00400 D. 0.00800
Which method of astronomical measurement is the precise measurement of brightness?
A) spectroscopy B) photography C) astrometry D) photometry E) interferometry
Intensity: The rate of energy flow per unit area of a sinusoidal electromagnetic wave has an average value of 0.601 W/m2. What is the maximum value of the magnetic field in the wave? (c = 3.00 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A. 7.09 × 10-8 T B. 5.02 × 10-8 T C. 3.55 × 10-8 T D. 9.81 × 10-8 T E. 1.42 × 10-7 T
Carla and Jenny are arguing about whether or not it is possible to escape the gravitational field of the Earth. Carla shows Jenny a system where mass m is rE (not the Earth's radius) distant from Earth and rP (not planet P's radius) distant from planet P, the mass being on the line connecting the Earth and planet P. Carla states that the mass m has escaped if FP on m = ?FE on m. Jenny
disagrees. Which one, if either, is correct, and why? a. Carla, because the total gravitational force on m is zero at that point. b. Carla, because there is no gravitational force from Earth on m at that point. c. Carla, because there is no gravitational force on m from Earth when r > rE. d. Jenny, because there is a gravitational force on m from Earth no matter how great the distance from the Earth. e. Jenny, because the gravitational force from the Earth can only be blocked by a body that is larger than the Earth.