A ball is thrown straight upward from ground level with a speed ...

[geoffrey]

A ball is thrown straight upward from ground level with a speed of How much time passes before the ball strikes the ground if we disregard air resistance?
 
  A) 3.7 s
  B) 1.8 s
  C) 1.1 s
  D) 0.6 s

Question 2

A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100C. At what rate does it radiate energy into empty space? ( = 5.67  10-8 W/m2  K4 )
 
  A) 7.1 W
  B) 0.71 mW
  C) 1.4 kW
  D) 9.9 mW
  E) 3.7 W

[jackie]

Answer to Question 1

A

Answer to Question 2

C

[geoffrey]

Thanks for the timely response, appreciate it

[Dnite]

Gracias!