The element hydrogen has the highest specific heat of all elements. At a temperature of 25°C, hydrogen's specific heat is 14,253 J/kg°C. If the temperature of a 0.34 kg
sample of hydrogen is to be lowered to its freezing point which is -259° C, how
much energy will have to be lost from the hydrogen? Also write the answer in
scientific notation.

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

Which of the following are properties of mechanical waves? check all that apply ⭕️ particles of the medium move back and fourth, but do not move with the wave. ⭕️ the particles of the medium always move parallel to the wave motion. ⭕️ wave motion begins with a disturbance in the medium. ⭕️ waves transport energy from a source outward, away from the source.

Aforce of 9.00 newtons acts at an angle of 19.0 to the horizontal. what is its component in the horizontal direction?