StatisticsDescriptive Statistics
Questions on Statistics: Identify Six Terms in a Recovery-Time Study
Identify population, sample, parameter, statistic, variable, and data in a cardiologist’s recovery-time study without inventing observations.
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StatisticsDescriptive Statistics
Right Skewed vs Left Skewed: Classify a Nine-Value Data Set
Classify all nine supplied values by their tail and check the result with a complete frequency table, mean, median, and mode.
StatisticsProbability
Probability and Statistics: Sample Space and Events for Eight Cards
List all eight colored-card outcomes and calculate green, conditional, intersection, union, and mutually exclusive event probabilities.
PhysicsClassical Physics
Tension Formula: A 30 kg Swing Held at 30°
Find the tension in each swing rope and the horizontal holding force by resolving the two rope tensions into components.
PhysicsClassical Physics
Tension Is a Force: A Ball in an Accelerating Freight Car
Calculate freight-car acceleration and string tension for a 20.0 g ball inclined 35.0° from vertical, using the horizontal and vertical components of tension.
PhysicsClassical Physics
How to Find Tension Force: Two Ropes Holding a 76 kg Performer
Use the original 15°/10° rope geometry and a free-body diagram to calculate both tensions supporting a 76.0 kg circus performer.
PhysicsClassical Physics
Examples of Newton’s Second Law: A Flea Jumping in a Breeze
Include ground reaction, wind and gravity to find the magnitude and direction of a flea’s acceleration while it is still touching the ground.
PhysicsClassical Physics
Example for the 3rd Law of Motion: Ordinary and Recoilless Rifles
Explain why an ordinary rifle recoils, how rearward discharge reduces recoil, and why the backblast is hazardous.
PhysicsClassical Physics
Example of Newton’s Third Law of Motion: Six Action–Reaction Pairs
Identify the two interacting bodies and their opposite forces in six examples of Newton’s third law.