The force required to move a 90.0 kg object in a 85.0 m circle at a constant speed of 8.10 m/s is
a. 0.0 N
b. 69.5 N
c. 0.77 N
d. 8.58 N
Ans: b. 69.5 N
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A plane has an airspeed of 142 m/s. A 16 m/s wind is blowing southward at the same time as the plane is flying. If the velocity of the plane relative to the ground is directly eastward, what is the magnitude of that velocity?
A) 141 m/s B) 160 m/s C) 130 m/s D) 16 m/s E) 48 m/s
Mass on a Spring: A 3.7-kg block on a horizontal frictionless surface is attached to an ideal spring whose force constant (spring constant) is 450 N/m. The block is pulled from its equilibrium position at x = 0.000 m to a position x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. The maximum elastic potential energy of the system is closest to
A. 1.4 J. B. 1.3 J. C. 1.6 J. D. 1.7 J. E. 1.8 J.
All places on Earth would have high tides at the same instant if the
A) Moon did not revolve. B) Moon did not rotate. C) Sun did not revolve. D) Sun did not rotate. E) none of the above
What does the phenomenon of interference demonstrate?
A) the wave nature of light B) the polarization of light waves C) the quantization of the atomic orbitals D) the particle nature of the photon E) the process of ionization