A Catapult Fires an 800-Kg Rock with an Initial Velocity

question 15

Multiple Choice

A catapult fires an 800-kg rock with an initial velocity of 100 m/s at a 40° angle to the ground.The magnitude of the horizontal impulse the catapult receives from the rock is

• A)5.1 × 10⁴ N s.
• B)6.1 × 10⁴ N s.
• C)8.0 × 10⁴ N s.
• D)5.0 × 10⁵ N s.
• E)6.0 × 10⁵ N s.

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Definitions:

Null

Often refers to a hypothesis which assumes no significant difference or effect in a statistical analysis.

Alpha

In statistics, the threshold probability of wrongly rejecting the null hypothesis, typically set at 0.05.

T-statistic

A ratio computed from the observed sample mean difference divided by the standard error of the mean, used in hypothesis testing.

Critical Values

Critical values are thresholds in statistical hypothesis testing that define the boundary between the region where the null hypothesis is rejected and the region where it is not rejected.