In an Elastic Collision Between Two Bodies of Mass M₁

question 26

Multiple Choice

In an elastic collision between two bodies of mass m₁ and m₂,with m₂ initially at rest,mass 1 moves off at angle θ relative to the direction of its initial velocity and mass 2 at angle φ.An exam paper shows the equations below:
M₁v_1i
0
= m₁v_1f cosθ + m₂v_2f sinφ
= m₁v_1f sinθ + m₂v_2f cosφ
What error(s) has the student made?

• A)In the first equation,m₂v_2f sinφ should be m₂v_2f cosφ.
• B)In the second equation,m₂v_2f cosφ should be m₂v_2f sinφ.
• C)In the second equation,the plus sign between the terms on the right should be a minus sign.
• D)All of the errors listed above.
• E)Only errors (a)and (b)above.

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Definitions:

Ending Inventory Value

The total value of all unsold inventory remaining at the end of an accounting period.

Average Cost Method

Uses the weighted average unit cost of the goods available for sale for both cost of goods sold and ending inventory.

Cost of Goods Sold

Direct expenditures involved in producing the merchandise a business sells.

FIFO Cost Flow

An inventory valuation method where the first items purchased are the first ones to be sold, assuming costs rise over time.