If a bus traveled 20 miles north on a straight path, and then traveled 20 miles back to the starting point, what would the velocity of the bus be?

0 mph

20 mph north

40 mph north

we do not have enough information.

i think its 20 mph north

Explanation:

The correct answer is the option d: We do not have enough information.

Explanation:

Hello!

Let's solve this!

To calculate the speed we need the distance traveled and the time it takes to travel it.

The speed formula is

v = x2-x1 / t2-t1

x2: final position

x1: initial position

t2: final time

t1: initial time

In the case of this problem, we have the distance traveled, but we have no time in any case.

After the analysis, we conclude that the correct answer is the option d: We do not have enough information.

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).