final grade7

A Ferrari car travels 1122 Km in 2 hours. A BMW car travels 500 Km in 1 hour .Which car has the greater average speed?

• Ferrari car

• BMW car

An airplane flies with a constant speed of 720 miles per hour. How long will it take to travel a distance of 360 miles?

(a)  

In distance graphs shown in the figure above illustrates the speed on vehicles.

• shows that the vehicle is traveling & its average speed is zero.

• shows that the vehicle is at rest & its average speed is zero.

• shows constant speed because it's a straight line.

• 2&3

In distance graph shown in the figure above illustrates the speed on vehicles

• Shows that the vehicle is traveling at a constant speed.

• Shows that vehicle at rest.

• Shows that vehicle is traveling at changing speed. It's speeding up.

• Shows that vehicle is traveling at changing speed which is decreasing.

The graph showing the distance moved by a toy car!
calculate its speed.

(a)  

In the lab we can use Light gates to measure the speed of a moving object. They are very useful because:

• they are very small.

• they are easy to use.

• they can measure short time intervals less than 1 second.

• they can measure long time intervals more than a minute.

A car is detected by a speed camera .The two detectors are separated by 5.0 m. The car travels this distance in 0.2s .What is its speed?

• 2.5 m/s

• 1.0 m/s

• 10 m/s

• 25 m/s

One of the following is not related to respiratory system

• Lachea.

• Trachea .

• Bronchi.

• none of them.

Gas exchange happens inside the lungs in:

• Alveoli

• Diaphragm

• wind pipe

• all of them

Gas exchange happens quickly ,because of one of the following:

• Thin wall of air sac

• Thin wall of the heart

• Large lungs

• 1&2