A hoop, a solid sphere, and a solid cylinder each have the same mass, radius, and initial speed and are going up the same inclined plane. Which one goes the farthest?
a. the hoop
c. the cylinder
b. the sphere
d. All go the same distance.
A
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A child has a temperature of 101°F. If her total cross-sectional area is 2 m2, find the energy lost each second (in W) due to radiation, assuming the emissivity is 1 . (Assume the room temperature is 70°F.)
a. 217 b. 180 c. 90 d. 68 e. 850
Radioactive Decay: A radioactive substance with a half-life of 3.0 days has an initial activity of 2400 Bq. What is its activity after 6.0 days?
A. 1200 Bq B. 1800 Bq C. 600 Bq D. 300 Bq E. 150 Bq
Two long parallel wires are a distance d apart. The current in one wire is 10 A and the current in the other wire is 30 A. The currents are in the same direction. If the 30-A current is increased to 50 A, by what factor does the magnitude of the magnetic field midway between the wires change?
a. 2 c. 25/9 b. 4 d. 5/3
Human hearing is best in
A) infrasonic sound. B) ultrasonic sound. C) both of these D) neither of these