One Spaceship Leaves Planet X and Heads Toward Planet Y,which

question 17

Multiple Choice

One spaceship leaves planet X and heads toward planet Y,which is 70 ly away,as measured in the rest frame of the two planets.100 ly later (again,in the two planets' rest frame) ,a second spaceship leaves planet Y and heads for planet X.Calculate the space time interval between these two events.

• A)71 ly
• B)57 ly
• C)80 ly
• D)89 ly

---

Definitions:

Machine-Hours

A measure of production time, tracking how many hours machines are operating in the manufacturing process.

Predetermined Overhead Rate

This rate is calculated before the period begins and is used to apply manufacturing overhead costs to products based on a consistent formula.

Fixed Manufacturing Overhead

Costs in manufacturing that do not vary with the level of production, including factory rent, salaries of permanent staff, and equipment depreciation.

Machine-Hours

A measure of the amount of time machines are operated in the manufacturing process, used as a basis for allocating costs.