A Projectile Starts at the Coordinate Origin,where the Displacement Vector $\theta$

question 21

Multiple Choice

A projectile starts at the coordinate origin,where the displacement vector also originates.The initial velocity,v₀,makes an angle $\theta$ ₀ with the horizontal where 0 < $\theta$ ₀ < 90 $\degree$ .At the instant when the projectile is at the highest point of its trajectory,the displacement,velocity and acceleration vectors are $\overrightarrow { \mathbf { r } }$ , $\overrightarrow { \mathbf { v } }$ and $\overrightarrow { \mathbf { a } }$ .Which statement is true?

• A) \(\overrightarrow { \mathbf { r } }\) is parallel to \(\overrightarrow { \mathbf { v } }\) .
• B) \(\overrightarrow { \mathbf { r } }\) is perpendicular to \(\overrightarrow { \mathbf { v } }\) .
• C) \(\overrightarrow { \mathbf { v } }\) is parallel to \(\overrightarrow { \mathbf { a } }\) .
• D) \(\overrightarrow { \mathbf { v } }\) is perpendicular to \(\overrightarrow { \mathbf { a } }\) .
• E) \(\overrightarrow { \mathbf { r } }\) is perpendicular to \(\overrightarrow { \mathbf { a } }\) .

Understand the significance of modern genetic tools in resolving questions about the evolutionary relationships among species.

Understand the definition and context of a scientific theory and differentiate it from non-scientific usage.

Comprehend the evolutionary relationships and evidence supporting the ancestry of modern whales.

Identify the function of hemagglutinins in viruses and their role in the viral life cycle.

---

Definitions:

Bounce Test

A quick diagnostic procedure used to check the suspension and shocks of a vehicle, where pressure is applied to the body and released to observe how the vehicle rebounds.

Camber

The angle of the wheels relative to the vertical direction of the car, affecting tire contact with the road and wear patterns.

Straight Tracking

The ability of a vehicle to maintain a straight path without constant steering corrections by the driver.

Electronic Stethoscope

An electronic listening tool used to isolate the source of problematic noises.