A 65-g handball is dropped to the floor from a height of 1 m, and ...

[RRMR]

A 65-g handball is dropped to the floor from a height of 1 m, and bounces to a height of 0.80 m. What is the magnitude of the impulse received by the ball from the floor?
 
  A)
 
  0.030 N s
 
  B)
 
  0.13 N s
 
  C)
 
  0.55 N s
 
  D)
 
  0.30 N s
 
  E)
 
  0.013 N s

Question 2

Today, the uranium found on Earth contains 0.720 235U (with a half-life of 0.700 billion years) and 99.28 238U
 
  (with a half-life of 4.50 billion years). At a time 2.20 billion years ago, what percent of the uranium on Earth was 238U (assuming that no other uranium isotopes were present)?
  A) 8.68 B) 95.6 C) 2.18 D) 4.53 E) 6.29

[shaquita]

Answer to Question 1

C

Answer to Question 2

B

[RRMR]

Gracias!

[EAN94]

Excellent