When a pair of 10-N forces act on a box of candy, the net force on the box is
A) zero.
B) about 14 N.
C) 20 N.
D) Any of the above depending on the directions of forces.
Answer: D
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A baseball is located at the surface of the earth. Which statements about it are correct? (There may be more than one correct choice.)
A) The earth exerts a much greater gravitational force on the ball than the ball exerts on the earth. B) The ball exerts a greater gravitational force on the earth than the earth exerts on the ball. C) The gravitational force on the ball due to the earth is exactly the same as the gravitational force on the earth due to the ball. D) The gravitational force on the ball is independent of the mass of the ball. E) The gravitational force on the ball is independent of the mass of the earth.
Monitoring comments on a website is considered wrong.
Answer the following statement true (T) or false (F)
A circular loop (area = 0.20 m2) turns in a uniform magnetic field with B = 0.13 T. At an instant when the angle between the magnetic field and the normal to the plane of the loop is (?) rads and is decreasing at the rate of 0.50 rad/s, what is the magnitude of the emf induced in the loop?
a. zero b. 13 mV c. 26 mV d. 20 mV e. 18 mV
Intensity: An 8.0-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.90 mm in diameter. What is the rms value of the electric field in this laser beam? (?0 = 8.85 × 10-12 C2/N ? m2, ?0 = 4? × 10-7 T ? m/A, c = 3.0 × 108 m/s)
A. 2200 N/C B. 1000 N/C C. 1100 N/C D. 4100 N/C E. 2000 N/C