A flat circular coil has 200 identical loops of very thin wire. Each loop has an area of 0.12 m2 and carries 0.50 A of current. This coil is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop
What is the magnitude of the magnetic torque on the coil? A) 0.25 N ? m
B) 0.52 N ? m
C) 2.5 N ? m
D) 5.2 N ? m
B
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A swimmer swims 20 laps in a north-south facing pool in 7.00 minutes. Her first lap is toward the north. Her displacement and average velocity are
A. 0; 0. B. 0; 2.38 m/s, south. C. 0; 2.38 m/s, north. D. 1 000 m, south; 2.38 m/s, south. E. 1 000 m, north; 2.38 m/s, north.
The bright light at the center of a shadow cast by a penny
1.supports the hypothesis that light can be viewed as rays traveling in straight lines. 2.results from the re-reflection of the diffraction pattern cast by the penny. 3.is the result of the penny's shininess; it acts like a mirror providing a second source to create an interference pattern. 4.is the central maxima of the interference pattern caused by the diffraction effects around the penny.
A person's eye lens is 2.7 cm away from the retina
(a) What must the focal length of this lens be in order for an object placed at the near point (N = 25.0 cm) of the eye to focus on the retina? (b) What must the focal length of this lens be in order for an object placed at the far point of the eye to focus on the retina?
A 1.5-kg block sliding on a rough horizontal surface is attached to one end of a horizontal spring (k = 200 N/m) which has its other end fixed. If this system is displaced 20 cm horizontally from the equilibrium position and released from rest, the block first reaches the equilibrium position with a speed of 2.0 m/s. What is the coefficient of kinetic friction between the block and the horizontal
surface on which it slides? a. 0.34 b. 0.24 c. 0.13 d. 0.44 e. 0.17