Errors of measurments

In S.I. system, the symbol for density is

• N/m³

• m³/s

• kg

• kg/m³

The basic quantity in the International system of units, is

• mole and light intensity

• all

• electric current

• time and temperature

1 points

10^-12, is called

• pica

• Mega

• Giga

• Terra

Identify the following quantities as scalar or vector: the mass of an object, the number of leaves on a tree, wind velocity.

• Vector, scalar, scalar

•  

  Vector, scalar, vector

• Scalar, scalar, vector

• Scalar, vector, vector

Which of the following is an example of a vector quantity?

• Temperature

• Velocity

• Volume

• Mass

Which of the following is a physical quantity that has both magnitude and direction?

•  

  Vector

•  

  Scalar

• Frame of reference

• Resultant

For the winter, a duck flies 10.0 m/s due south against a gust of wind with a speed of 2.5 m/s. What is the resultant velocity of the duck?

•  

  -7.5 m/s south

• 12.5 m/s south

• 7.5 m/s south

• -12.5 m/s south

In a coordinate system, a vector is oriented at an angle with respect to the x-axis. The y-component of the vector equals the vector's magnitude multiplied by which trigonometric function?

• Tan angle

• Cos angle

• Cot angle

• Sin angle

 

Which of the following exhibits parabolic motion?

• A space shuttle orbiting Eart

• A leaf falling from a tree

• A stone thrown into a lake

• A train moving along a flat track

Measurement which is close to the true value is

• average

• precise

• error

• accurate