Physics Practice test for Long Test 1

This refers to how close the measurement is to the true or accepted value

• estimate
• accuracy
• precision
• mean

This refers how close a group of measurements are to eachother

• estimate
• accuracy
• precision
• mean

The diameter of a carbon atom is 0.000 000 000 154 m. What is this number expressed in scientific notation?

• 1.54 x 10¹² m
• 1.54 x 10^-12 m
• 1.54 x 10¹⁰ m
• 1.54 x 10^-10 m

Which of the following measurements is expressed to three significant figures?

• 0.007 m
• 7077 mg
• 7.30 x 10^-7 km
• 0.070 mm

How many significant figures are in the measurement 40,500 mg?

• two
• three
• four
• five

Jessie estimates the weight of her cat to be 8 pounds.  The actual weight of the cat was 10 pounds.  Find the percent error.  

• 15%
• 20%
• 25%
• 30%

What is the definition of displacement?

• An object that is lost without any scientifically explained reason

• .

  A vector that points from an object's initial position to its funal position and has a magnitude that equals the shortest distance between two points

• A vector that points from an object's initial position to its funal position and has a magnitude that equals the greatest distance between two points

• None of the above

What is the definition of average velocity?

• Average Velocity= displacement ------------------ elapsed time

• Elapsed time= Distance ------------- speed

• Velocity= Elapsed time ----------------- acceleration

• None of the above

______________ does not reveal about the direction of the motion. To describe how fast an object moves and the direction of its motion, we need the vector concept of _____________

• speed , velocity

• distance , time

• speed , time

• displacement, velocity

When an object is in free fall,

• its speed stays the same.

• it decelerates

• it accelerates.

• none of the above.