Compared to the speed of a 400 Hz sound, the speed of a 200 Hz sound through air is
A. twice as great.
B. the same.
C. one half as great.
D. none of these answers are correct
B. the same.
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A primary force that produces air motion is
a. gravity. b. the Coriolis force. c. friction. d. the electromagnetic force.
A car has a mass of 930 kg has wheels with a radius of 35 cm, and the distance between the axles is 3.1 m. The coefficient of static friction between the tires and the road is 0.52
It is equipped with anti-lock brakes so that the tires do not slide when it is braking. If the weight of the car is supported equally by the four tires, what is the total torque on the tires exerted by the forces between the tires and the horizontal road when there is maximum braking, i.e. when the tires are about to slip? A) 1.2 × 102 N m B) 1.7 × 103 N m C) 1.2 × 104 N m D) 1.6 × 102 N m E) 1.4 × 104 N m
What do X-ray observations tell us about conditions around a potential nova?
What will be an ideal response?
Parallel-Plate Capacitor: Two large closely-spaced parallel metal plates are uniformly and oppositely charged and the electric field between them is 7.6 × 106 N/C.(a) What is the charge per unit area on each plate?(b) If the plates are now moved two times farther apart, what is the electric field between the plates?
What will be an ideal response?