Jamal blasts an air-horn to start a race. Lewis hears the horn from his house 274 meters away. Given that sound travels through air at 340 m/s, how long did it take the sound to travel from Jamal to Lewis?

440 s

0.81 s

1.2 s

66 s

3) A 900N mountain climber scales a 100m cliff. How much work is done by the mountain climber?

Which of the following materials requires the most amount of heat to raise (or lower) its temperature by one degree Celsius? Assume we have the same amount of each material, 10 grams. Feel free to reference Table 14.1 in the OpenStax textbook.

Which property describes the amount of energy that flows past a given area per unit of time?

Percy Spencer was an American engineer and, while working for Raytheon, was building magnetrons for radar sets. One day, he was standing in front of an active radar set when he noticed the candy bar he had in his pocket melted.

A hockey puck is sliding along the ice with nearly constant momentum ‹ 7, 0, 4 › kg · m/s when it is suddenly struck by a hockey stick with a force ‹ 0, 0, 2100 › N that lasts for only 7 milliseconds (7*10-3) s.

The act, process or state of the change in place or position oa a body with respect to time and relative to the observer is said to be : - 1. Rest 2. Stationary 3. Motion 4. None of the above

During a snowball fight two balls with masses of 0.4 kg and 0.6 kg, respectively, are thrown in such a manner that they meet head on and combine to form a single mass of 1 kg. the magnitude of intial velocity foreach is 15 m/s.

Which phases of matter do molecules have the lowest amount of energy?

How many Oxygen (O) atoms are in the following? H2O + CO2 4 3 2

How does surface roughness affect friction