1. What conditions must exist in order for a force to do work on an object?

Which best compares simple machines with compound machines? Both make work easier, but compound machines consist of two or more simple machines. Both make work easier, but compound machines have less mechanical advantage than simple machines.

Which is the most accurate statement about the observation of astronomical objects? A) it is easier to notice the motions of objects closer to us B) it is easier to notice the motions of objects farther from us C) the distance to an object does not

John has a barometer for measuring atmosphere pressure as he climbes mt. Everest the highter he gets the higher the pressure reading is this a result he should expect

A boat traveled at a constant speed for 5 hours, covering a total distance of 132.3 kilometers. how fast was it going?

A hanging block oscillating on the end of a spring passes through equilibrium at a speed of 2.0 m/s. It returns to equilibrium 0.75 s later. Calculate the total distance that it traveled between these two moments in its vibration.

The index of refraction of silicate flint glass for red light is 1.620 and for violet light is 1.660. A beam of white light in this glass strikes the glass-air interface at a 25.50∘ angle of incidence and refracts out into the air.

The locations of the major pressure and wind systems on the earth:

Which statements correctly describe the properties of heat? Select all that apply. Heat is an essential component of life on Earth. Heat is energy that flows from one object to another. Heat flows from a hotter object to a colder one.

A book is sitting on a table at rest. Which of the following best describes the forces acting on the book? A.

When NASA's Skylab reentered the Earth's atmosphere on July 11, 1979, it broke into a myriad of pieces. One of the largest fragments was a 1770-kg lead-lined film vault, and it landed with an estimated speed of 120 m/s.?