Relative Velocity: A plane moving 200 m/s horizontally fires a projectile with speed 50 m/s in a forward direction 30.0° below the horizontal. At that instant, what is the speed of the projectile with respect to a stationary observer on the ground?
A. 245 m/s
B. 250 m/s
C. 268 m/s
D. 293 m/s
Answer: A
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If high tide is at noon, the next high tide will be at
A. 6 am B. noon tomorrow. C. midnight. D. 6 pm
A long cylinder (radius = 3.0 cm) is filled with a nonconducting material which carries a uniform charge density of 1.3 ?C/m3. Determine the electric flux through a spherical surface (radius = 2.0 cm) which has a point on the axis of the cylinder as its center.
A. 5.7 N ? m2/C B. 4.9 N ? m2/C C. 6.4 N ? m2/C D. 7.2 N ? m2/C E. 15 N ? m2/C
In interactions taking place by the strong force, which of the following quantities are conserved?
a. electric charge b. baryon number c. mass-energy d. strangeness e. linear momentum f. angular momentum (spin)
Torque: A flat rectangular loop of wire is placed between the poles of a magnet, as shown in the figure. It has dimensions w = 0.60 m and L = 1.0 m, and carries a current I = 2.0 A in the direction shown. The magnetic field due to the magnet is uniform and of magnitude 0.80 T. The loop rotates in the magnetic field and at one point the plane of the loop is perpendicular to the field. At that instant, what is the magnitude of the torque acting on the wire due to the magnetic field?
A. 0.00 N ? m B. 0.40 N ? m C. 0.48 N ? m D. 0.83 N ? m E. 0.96 N ? m