Answer:
Radio waves are used for communications and radar. Microwaves are used to cook your food. Infrared waves are used in remote controls and are emitted from all warm objects, allowing them to be used to create heat-sensitive cameras.
Explanation:
Basically electromagnetic waves can be found in your everyday life.
Inertia is a property of all the objects. Galileo stated that inertia is proportional to mass. Therefore, the answer is D.
Answer:
Explanation:
Speed is a measurment that tells him much distance a body travels over a certain amount of time (usually measured in meters per second (m/c))
Answer:
Positive work
Explanation:
When work and the exerted force are in the same direction, then the work done is positive.
In the question, we understand that Marvin lifts a box up (i.e. over his head). The force to lift the box acts in the upward direction and the work done itself is also in the upward direction (from the floor to Marvin's head).
Since these two are in the same direction, then we can conclude that the work done is positive.
