Why does air escape from a tire when the tire valve is opened?

A student drove to the university from her home and noted that the odometer reading of her car increased by 12.0 km. The trip took 18.0 min. (a) What was her average speed

1. Indicate whether these objects or atoms are positively, negatively or neutrally charged.

Are the voltages across resistors in series generally the same? if not, are there special cases where they could be the same? explain.

the linear expansivity of the material of a cube is 1.2*10^-6 k^-1. if the length of each side of the cube is 10cm. find the area of one face of the cube and the volume of the cube when it's temperature is raised by 30k.

Energy is the energy an object has because of its motion. True or False

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?