Explain how you know that gasoline burning in a car engine is a chemical change.?

What is the time period and frequency of a sound wave if it completes 500 vibrations in 50 seconds

Elements that have the lowest densities of all the metals are called

A 700-kg car, driving at 29 m/s, hits a brick wall and rebounds with a speed of 4.5 m/s. What is the car's change in momentum due to this collision? A. 2.3x 10^4 kg·m/s towards the wall B. 2.3x 10^4 kg·m/s away from the wall C. 1.

Which state of matter would be described as a highly energized charge particles with moving extremely fast

Which of the following is a claim of special relativity? A. All laws of physics apply to frames of reference that start from rest. B. All laws of physics apply to frames of reference that are changing speed. C.

Which structure connects muscles to bone?

A firefighter mounts the nozzle of his fire hose a distance 36.9 m away from the edge of a burning building so that it sprays from ground level at a 45° angle above the horizontal. After quenching a hotspot at a height of 8.

A force is applied to a 13.0 kg wagon to pull it down the sidewalk at a constant speed. The coefficient of kinetic friction is 0.65. Considering the resulting frictional force, what is the magnitude of the applied force?

What field (s) does a moving electron have? A. electric and gravitational fields B. magnetic and gravitational fields C. gravitational, electric, and magnetic fields D. electric field only

Copper has a specific heat of 0.385 j. A piece of copper absorbs 5000 J of energy and undergoes a temperature change from 100 Celsius to 200 degrees Celsius. What is the mass of the piece of copper?