The mass and radius of the moon are 7.4 × 1022 kg and 1.7 × 106 m, respectively.  What is the weight of a 5.0 kg object on the surface of the moon?

A 77.0 kg astronaut pushes to the left on a spacecraft with a force  in “gravity-free” space.  The spacecraft has a total mass of 1.0 × 104 kg.  During the push, the astronaut accelerates to the right with an acceleration of 0.8 m/s2. Determine the magnitude of the acceleration of the spacecraft.

A 50.0 kg boy runs at a speed of 10.0 m/s and jumps onto a cart as shown in the figure.  The cart is initially at rest.  If the speed of the cart with the boy on it is 2.50 m/s, what is the mass of the cart?

Complete the following statement: The net force that results when two or more forces act on an object is

Mike is cutting the grass using a human-powered lawn mower.  He pushes the mower with a force of 50 N directed at an angle of 40° below the horizontal direction.  Calculate the work that Mike does on the mower each time he pushes it 9 m across the yard.

Complete the following statement: In an isolated system, the total mechanical energy remains constant if

What bacteria commonly cause strep throat?

Peristalsis moves the food from the pharynx to the: 

Treatment for reflux esophagitis includes: 

Periodontal disease affects the: