A0.600 m long pendulum is used to determine the acceleration due to gravity on a distant planet. if 20 complete oscillation are completed and 35.5 seconds, the acceleration is a) 7.52 m/s squared b) 9.81 m/s squared c) 30.5 m/s squared d) 42.0 m/s squared

Why is alternating current more effective at long–distance travel than direct current? a. the power lines are made out of conductors. b. transformers increase or decrease voltage as needed. c. the ac generator is more efficient. d. ac has lower voltage than dc.

What effects result when there is an impact between earth and an asteroid? check all that apply. a. massive flooding. b. extinction of many life forms. c.major earthquakes change in average global temperature. d. giant dust cloud

An athlete is holding 24 lb of weights at a height of 6 inches above the stack as shown. to lower the weights, she applies a constant force of 5 lb to the handle. determine the velocity of the weights immediately before they hit the stack.