Physics Questions

Mechanical energy is the sum of

An echo is returned in 3 s. What is the distance of the reflecting surface from the source, considering the speed of sound as 342 ms-1?

The diameter of the reflecting surface of a spherical mirror is called a/an

What is the heat generated (in J) in a heating element of resistance 800 Ω when a current of 0.2 A passes through it for 40 seconds?

Consider a hypothetical planet whose mass and radius are both half that of Earth. If g is the acceleration due to gravity on the surface of Earth, the acceleration due to gravity on the planet will be

During the free fall of the object, the decrease in potential energy, at any point in its path, appears as an equal amount of increase in _________________.

The energy released at the end of digestion is in the form of

What is the upward force exerted by water called?