A ball rolling down a hill has a constant acceleration of 3 m/s2 ...

[vicotolentino]

A ball rolling down a hill has a constant acceleration of 3 m/s2 . If the ball's mass is 2.5 kg, what is the net force acting on the ball?

Question 2

How will the Laser Interferometer Gravitational-Wave Observatory (LIGO) and the Laser Interferometer Space Antenna (LISA) observe gravitational waves?
 a. They will detect vibrations in very long solid metal cylinders.
  b. They will use laser light to detect tiny changes in the distance between mirrors placed far away from each other.
  c. They will measure the force on precision masses at the ends of long tunnels from a large moving mass in the central building.
  d. They will measure the changes in the attraction between two masses as one rotates past the other suspended from a thin metal wire.
  e. They will measure changes in frequency of two masses swinging past each other.

[Pamela.irrgang@yahoo.com]

Answer to Question 1

7.5 N

Answer to Question 2

b

[vicotolentino]

Excellent

[coreycathey]

TYSM