A bird is gliding at 40 meters per minute. How long, in minutes, will it take the bird to travel 160 meters?

4 minutes

Step-by-step explanation:

160/40 = 4  

Step-by-step explanation:

40

h

Explanation:

We're asked to find the time it takes an object (bird) to travel

1800

km

at a constant speed of

45

km/h

.

We have our simplified speed equation:

speed

=

distance

time

Rearranging for time:

time

=

distance

speed

We're given:

speed

=

45

km/h

distance

=

1800

km

Plugging these in:

time

=

1800

km

45

km

h

=

¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯

∣

∣

40

l

h

∣

∣

−−−−−−−−−

The journey will take

40

l

hours

.

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.