Question

1. 14 pts] A 7-kg block hangs vertically on a spring, oscillating with amplitude 0.2 m. You measure the maximum speed of the block to be 4 m/s. What is the spring constant ? O 2800 O 450 O 140 O 3.5 O 1.75 2. [2 pts] What are the units of your answer? O kg kg/s Okg/s? Okgm/s? kg-m/s 3. 5 pts) You take this block and spring to Mars, where the acceleration due to gravity is only 3.7 m/s. Is the period of the block's oscillation on Mars greater than, less than or equal to the period of the block's oscillation on Earth? O Greater than O Less than O Equal to O Not enough information 4. [4 pts) A transverse wave on a string is traveling in the y-direction. Which of the following could possibly describe the displacement of the string? (Mark all that apply.) The displacement could be in the x-direction The displacement could be in the y-direction The displacement could be in the z-direction None of these is possible

Answer 1

tele Vmax = 4 mis = 20 rad/s A = Amplitude -0.2m [V= WA Ww wa umwe – 70 (20) = 400x7 K = 2800 N/m 1 ② weit / kg, met kg/g2 ③ Time period - 27 Hence I does not depends upon 'd gravitational acceleration, So Time period remains unchanged. (9) The displacement Comendol be always I perpendicular, will So The displacement is in x & 2 direction