ECE 221 Lecture 4: Electron Drift

Which of the following best illustrates the relationship between entities and attributes?

1. the entity CUSTOMER with the attribute PRODUCT
2. the entity CUSTOMER with the attribute PURCHASE
3. the entity PRODUCT with the attribute PURCHASE
4. the entity product with the attribute CUSTOMER

Which example of the change in velocity will produce an acceleration

1. A boy running on a road with constant speed

2. A vehicle running with 50 m/sec speed

3. An object performing circular motion with constant speed

4. A particle moving in the vacuum with constant speed

write an expression that evaluates to true if the str associated with s starts with "p".