A 14-A current flows into a series combination of a 3.0-? and a 4.0-? resistor. What is the voltage drop across the 3.0-? resistor?
A)
42 V
B)
56 V
C)
98 V
D)
38 V
E)
24 V
A
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An isotope of Tc having a half-life of 6.0 h is used in bone scans. If a certain amount of this Tc is injected into the body, how long does it take for its initial decay rate to decrease BY 99%?
A) 0.060 h B) 3.3 h C) 33 h D) 40 h E) slightly more than a month
The Bohr model of the hydrogen atom accounts for which quantum number?
a. principal b. orbital c. orbital magnetic d. All of the above.
A large block of wood and a small block of iron each register 2000 N on a weighing scale. Taking buoyancy of air into account, which has the greater mass?
A) wood B) iron C) both the same
Projectile Motion: A projectile is fired from ground level with a speed of 150 m/s at an angle 30° above the horizontal on an airless planet where g = 10.0 m/s2. What is the horizontal component of its velocity after 4.0 s?
A. 150 m/s B. 35 m/s C. 130 m/s D. 75 m/s E. 38 m/s