A transverse periodic wave is represented by the equation z(y, t) = 1.50 cm sin(1,250 rad/s t + 10.0
What is the direction of the velocity of the wave?
A. the x direction
B. the y direction
C. the z direction
D. the t direction
B. the y direction
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The half-life of 19N is 0.42 s. What is the decay constant for this isotope?
a. 1.7 × 10^–11 Ci b. 1.7 s–1 c. 1.1 s–1 d. The decay constant is not defined for a half-life of less than one second.
Consider a student whose mass is 70 kg. If all his mass were converted to electrical energy, for how many years could he keep a 100-W light bulb burning? (c = 3.0 × 108 m/s)
What will be an ideal response?
Consider a situation where you carry a 20 N box up a flight of stairs, raising its elevation by 5 m. The increase of potential energy of the box is
a. 0 c. 100 J b. 4 J d. none of the above
A hot object that is glowing orange will become redder as it cools
a. True b. False Indicate whether the statement is true or false