A sample contains 24 g of a radioactive isotope. How much radioactive isotope remains in the sample after 2 half-lives?

A. 3 g

B. 6 g

C. 12 g

D. 1.5 g

A man pulls on his dogs leash to keep him from running after the bicycle. Which term best describes this example?

A fire engine must lift 30 kg of water a vertical distance of 20 m each second. What is the amount of power needed for the water pump for this fire hose?

A small pickup truck that has a camper shell slowly coasts toward a red light with negligible friction. two dogs in the back of the truck are moving and making various inelastic collisions with each other and the walls.

Two or more velocities add by

When loading your muzzleloading firearm, why is it important to eliminate any air space between the projectile and the powder charge?

Which of the following is a vector quantity (a) mass (b) speed (c) time (d) acceleration

A 85-kg astronaut (including spacesuit and equipment) is floating at rest a distance of 11 m from the spaceship when she runs out of oxygen and fuel to power her back to the spaceship. She removes her oxygen tank (3.

Find the specific gravity of the rose quartz. Specific gravity = density of of water. What are the units for specific gravity?

A ball of mass 5.0kg is lifted off the floor a distance of 1.7m. 1. What is the change in the gravitational potential energy of the ball? 2. Now you release the ball from rest, and it falls to the floor.

What is the device to break a circuit called?