2. Acoustics , scalar and vector , velocity and acceleration

What distinguashes a vector from a scalar?

• Vectors are always longer in value

• Vectors have both magnitude and direction

• Scalars are used only in physics

• Scalars can't be measured

Which of the following is a scalar quantity?

• Displacement

• Length

• Velocity

• Acceleration

A person walks 5 meters east. This is an example of

• Distance

• Speed

• Force

• Displacement

Which physical quantity is a vector?

• Mass

• Distance

• Velocity

• Tempreture

What is the formula of velocity

• a / t

• x / t

• x / d * t

• x / t

Which of the following correctly describe instantaneous velocity

• Distance divided by time

• Velocity at a particular instant of time

• The average speed in a round trip

• Velocity measured after 1 hour

The SI unit of acceleration is

• m/s2

• m/s

• cm2/s

• N/m

A car's speedometer showes 60 km/h at one moment. This is an example of

• Average velocity

• Constant acceleration

• Instantaneous velocity

• Scalar magnitude

Which statement is TRUE?

• Scalars always involve direction

• Acceleration is a scalar

• Displacement is a vector

• Velocity is unrelared to displacement

What does acceleration describe?

• Distance travel

• Rate of change of velocity

• Direction of movement

• Time of travel