A series of ocean waves, each 24.0 m from crest to crest and moving past an observer at a rate of 6.0 waves per second, has what speed?
a. 144 m/s
b. 4 m/s
c. 6 m/s
d. 0.25 m/s
a
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An unstable particle produced in a high-energy collision is measured to have an energy of 483 MeV and an uncertainty in energy of 84 keV
Use the Heisenberg uncertainty principle to estimate the lifetime of this particle. ( h = 1.055 × 10-34 J • s = 6.59 × 10-16 eV • s)
Rotational Kinetic Energy: A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts down a ramp that makes an angle of 25° below the horizontal. What is the rotational kinetic energy of the hoop after it has rolled 3.0 m down as measured along the surface of the ramp?
A. 34 J B. 22 J C. 45 J D. 62 J E. This question cannot be answered without knowing the radius of the hoop.
A laser beam strikes a plane reflecting surface with an angle of incidence of 37°. What is the angle between the incident ray and the reflected ray?
What will be an ideal response?
Which of the following is a positively charged polyatomic ion?
a. Potassium ion b. Sulfide ion c. Ammonium ion d. Sulfate ion