A child is stationary on a swing. The child is given a push by his brother to start him swinging. His brother applies a steady force of 84 N over a distance of 0.25 m. Calculate the work done by this force.

Most people in south and south east Asia live in

A 50 gram yo-yo is released and travels vertically downward, rolling without slipping. Knowing that the yo-yo's moment of inertia is 9 x 10-5 kg m2 and the radius of its center spindle is 0.

Mateo makes a table of the symbols that represent the parts of an electric circuit. What label should Mateo place in the marked cell?

How much force is needed to accelerate a 68 kilogram-skier at a rate of 1.2 m/sec^2?

Describe how the design of a vacuum flask keeps the liquid inside hot?

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.?

A spring gains 2.34 joules of elastic potential energy as it is compressed 0.250 meter from its equilibrium position. What is the spring constant of this spring? (1) 9.36 N/m (3) 37.4 N/m (2) 18.7 N/m (4) 74.9 N/m

Form hypothesis: Where do you think we humans get energy?