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5. [-/11.11 Points] DETAILS OBINPHYS8 1.P.010. MY NOTES ASK YOUR TEACHER The Moon is about 3.8 x 108 m from Earth. Traveling at the speed of light, 3.0 x 108 m/s, how long does it take a laser beam to go from Earth to the Moon and back again (in s)? The same physics was responsible for the noticeable delay in communications signals between lunar astronauts and controllers at the Houston Space Flight Center. Need Help? Read It 6. [-/11.11 Points] DETAILS OBINPHYS8 1.P.017. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A high-performance sports car can go from 0 to 100 mph (44.7 m/s) in 6.8 s. (Assume the car travels in the positive direction. Indicate the direction with the sign of your answer.) (a) What is the car's average acceleration? m/s2 (b) The same car can come to a complete stop from 25 m/s in 3.7 s. What is its average acceleration? m/s Need Help? Read It 7. [-/11.11 Points] DETAILS OBINPHYS8 1.P.020. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A child sits on the edge of a spinning merry-go-round that has a radius of 2.4 m. The child's speed is 3 m/s. What is the child's acceleration? m/s2 radially inward Need Help? Read It 8. [-/11.11 Points] DETAILS OBINPHYS8 1.P.023. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A rocket accelerates from rest at a rate of 42 m/s2. (a) What is its speed after it accelerates for 23 s? m/s (b) How long does it take for the rocket to reach a speed of 7,700 m/s? S Need Help? Read It 9. [-/11.12 Points] DETAILS OBINPHYS8 1.P.027. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A skydiver jumps out of a helicopter and falls freely for 6.0 s before opening the parachute. (a) What is the skydiver's downward velocity when the parachute opens? m/s (b) How far below the helicopter is the skydiver when the parachute opens? m Need Help? Read It