# Posts by amena

Total # Posts: 5

**physics**

Over a time interval of 1.98 years, the velocity of a planet orbiting a distant star reverses direction, changing from +21.9 km/s to -17.2 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s2) during this interval. ...

**physics**

Over a time interval of 1.98 years, the velocity of a planet orbiting a distant star reverses direction, changing from +21.9 km/s to -17.2 km/s. Find (a) the total change in the planet's velocity (in m/s) and (b) its average acceleration (in m/s2) during this interval. ...

**physics**

A boy jumps from rest, straight down from the top of a cliff. He falls halfway down to the water below in 0.993 s. How much time passes during his entire trip from the top down to the water? Ignore air resistance. Pls help and explain!

**math**

Write in exponential notation x*x*x*x*x*y*z

**physics**

A solid ball is released from rest and slides down a hillside that slopes downward at an angle 52.0 from the horizontal.What minimum value must the coefficient of static friction between the hill and ball surfaces have for no slipping to occur?