A 78.0 kg object is travelling due North at 15.2 m/s, and experiences a constant net force of 1.72 kN toward the South. How long will it take to stop under the influence of this force?
A. 1.45 s
B. 2.98 s
C. 0.335 s
D. 0.689 s
D. 0.689 s
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Fluid Flow: Ideal incompressible water is flowing in a drainage channel of rectangular cross-section. At one point, the width of the channel is 12 m, the depth of water is 6.0 m, and the speed of the flow is 2.5 m/s. At a point downstream, the width has narrowed to 9.0 m, and the depth of water is 8.0 m. What is the speed of the flow at the second point?
A. 2.0 m/s B. 2.5 m/s C. 3.0 m/s D. 3.5 m/s E. 4.0 m/s
A positively charged particle has a velocity in the negative z direction at point P. The magnetic force on the particle at this point is in the negative y direction. Which one of the following statements about the magnetic field at point P can be determined from this data?
A. Bx is positive. B. Bz is positive. C. By is negative. D. By is positive. E. Bx is negative.
As the temperature of a wire increases, its ________ also increases.
Fill in the blank(s) with the appropriate word(s).
A dam is thicker at the bottom than at the top because
A) water is denser at deeper levels. B) water pressure is greater at deeper levels. C) water is cooler at deeper levels. D) dams look better. E) none of the above