An isotope decreased to one fourth its original amount in 18 months. What is the half life of this radioactive isotope?

What are to examples of radiation?

A grocery shopper tosses a 9.0 kg bag of rice into a stationary 18.0 kg grocery cart. The bag hits the cart with a horizontal speed of 5.5 m/s toward the front of the cart. What is the final speed of the cart and bag

If the forces acting upon an object are balanced (ie in equilibrium), then the object A. must not be moving (ie, at rest, v = 0 m/s) B. must be moving with a constant velocity (ie v# 0 m/s) C. must not be accelerating (i e, a = 0 m/s/s) D.

An 8-kg mass is in free fall. What is the velocity of the mass after 9 seconds?

A 1.5 wire carries a 8 A current potential difference of 89 V is applied. What is the resistance of the wire

What does it mean when we say an atom has decayed?

If the mass of a material is 77 grams and the volume of the material is 19 cm3, what would the density of the material be

A bicyclist is in a 50-km race. She says she had an average velocity of 35. What is missing in the cyclist's velocity? A. units only B. units and distance C. direction only D. units and direction

Which one of the following statements concerning emf is true? A) Emf is the work done in moving the current from one terminal to the other of an emf device.

A fan is a complex machine? True or false?