Jeff’s father is installing a do-it-yourself security system at his house. he needs to get a device from his workshop that converts electric energy to sound energy. which device is jeff’s father looking for? a. switch b. motor c. buzzer d. bulb e. battery

C). Buzzer

Explanation:

In electric buzzer is a device which produce sound of high amplitude when electric current flows through it.

As per the concept of energy we know that the electrical energy when given to the buzzer then the electrical energy is converted into sound energy.

So here we can say that the correct answer here is

C).Buzzer

while in other options

B) Motor : Electrical energy is converted into mechanical energy

D) Bulb : electrical energy is converted into light energy

E) Battery : Chemical energy is converted into electrical energy

given data:

determine the horse power (h.p) = ?

force applied to move the box(f) = 10 pounds,

box lifted from a distance         (d) = 3 feet

time taken to lift                         (t) = 10 sec,

the horse power is defined as amount of work required to move a load. the horse power is equal to 550 foot-pound per second

                  1 h.p   = 550 foot-pound/second

it can also be defined as the the load that need to be move a body for certain distance in a certain amount of time.

mathematically,

                      h.p = (force × distance)/ time

                            = (10 × 3)/ 10

                            = 30/10

                            = 3 foot -pound/sec

hence, the horse power is needed to move the box is 3 foot-pound/second

important note: 1 h.p = 550 foot-pound/second = 746 watts

d. air pressure decreases as altitude increases.