4 years ago

A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at

Physics

1 answer:

miv72 [106K]4 years ago

3 0

Answer:53.3m/s

Explanation:

time for first travel

time=distance/speed

time=40/80

time=0.5seconds

time for second travel:

time=distance/speed

time=40/40

time=1seconds

total time=0.5+1

total time=1.5seconds

Then average speed for 80km trip:

Speed=distance/time

Speed=80/1.5

Speed=53.3m/s

You might be interested in

A rope is vibrating so as to form the standing wave pattern shown. How many antinodes are present in the rope?a- 5b- 4c- 8d- 10e

denpristay [2]

c) 8

Explanation

When you shake a rope, the particles in the rope move up and down, and the wave moves forward or away from the source of energy. The rope moves in a direction that is perpendicular

Nodes are the places where the rope doesn't move at all; antinodes occur where the motion is greatest.

Step 1

let's check the graph:

a) Nodes

and Antinodes

so, in the ripe there are 8 antinodes

therefore, the answer is

c) 8

4 0

1 year ago

A 2000 Hz siren and a civil defense official are both at rest with respect to the ground. What frequency does the official hear

astra-53 [7]

Answer:

a) $f_1 = 2070.6 Hz$

b) $f_2 = 1929.4 Hz$

Explanation:

Apparent frequency of the siren is given as

$f = \frac{v_{rel}}{\lambda}$

as we know that the wavelength will remain the same as it is having originally

sowe know

$\lambda = \frac{340}{2000}$

$\lambda = 0.17 m$

a) Now when wind is blowing from source to official

so we have

$v_{rel} = 340 + 12 = 352 m/s$

so we have

$f_1 = \frac{352}{0.17}$

$f_1 = 2070.6 Hz$

b) Now when wind is from official to source

so we have

$v_{rel} = 340 - 12 = 328 m/s$

so we have

$f_2 = \frac{328}{0.17}$

$f_2 = 1929.4 Hz$

4 0

4 years ago

Daily point..........d

Alina [70]

Answer:

lovely

Explanation:

4 0

3 years ago

Read 2 more answers

A timeline is necessary a. For every goal c. For every life goal b. For every academic goal d. For every high school goal please

kiruha [24]

I’d say for every life goal

5 0

3 years ago

Read 2 more answers

What is an electron?<br><br><br> (it’s D lol)

kupik [55]

Answer:

Explanation:

4 0

3 years ago