Question

a) How many helium-filled balloons would it take to lift a person? Assume the person has a mass of 67 kgkg and that each helium-filled balloon is spherical with a diameter of 33 cmcm. Express your answer using two significant figures.

b) After landing on an unfamiliar planet, a space explorer constructs a simple pendulum of length 55.0 cmcm . The explorer finds that the pendulum completes 102 full swing cycles in a time of 128 ss . What is the magnitude of the gravitational acceleration on this planet?

Answer 1