The detector has 2000 x 2000 pixels. What is the minimum angular separation between two stars in the cluster that can be resolved with this observing system if we ignore the effects of diffraction and the Earth's atmosphere?

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

Which statement is true? a. kepler's laws apply only to the motion of earth. b. kepler's laws can be used to predict eclipses. c. kepler's laws are true for a central force that is directly proportional to distance. d. kepler's laws can be deduced from newton's laws of motion and gravity.

What is the measurement of how fast an object moves relative to a reference point?