Which choice represents velocity?(1 point)
Responses
12 m/s2
15 km/hr west
4 g/mL
35 m/s
15 km/hr west
To determine which choice represents velocity, let's first understand what velocity means.
Velocity is a vector quantity that measures the rate at which an object changes its position. It specifies both the magnitude (speed) and direction of motion.
Now, let's analyze each option:
1. 12 m/s2: This value represents acceleration, not velocity. Acceleration measures the rate at which an object changes its velocity, not the velocity itself.
2. 15 km/hr west: This option does represent velocity. It has both magnitude (15 km/hr) and direction (west). The positive value indicates the magnitude or speed, and the direction (west) specifies the object's motion.
3. 4 g/mL: This value does not represent velocity. It represents density, which is the mass per unit volume.
4. 35 m/s: This option does represent velocity. It indicates a speed of 35 m/s, but it does not provide any information about direction. So, while it represents magnitude, the direction is unknown.
In conclusion, options 15 km/hr west and 35 m/s represent velocity, as they provide both magnitude and direction.
The correct choice that represents velocity is:
35 m/s
The graph below shows a cyclist’s velocity over a period of time.
Describe the cyclist’s acceleration.
(1 point)
Responses
The acceleration of the cyclist is constant and zero
The acceleration of the cyclist is constant and zero
The acceleration of cyclist is going down
The acceleration of cyclist is going down
The acceleration of the cyclist is going up
The acceleration of the cyclist is going up
The acceleration of the cyclist is constant and non-zero
To determine the cyclist's acceleration, we need to observe the gradient (slope) of the velocity graph.
If the velocity-time graph is a straight line with a constant gradient, the acceleration is constant.
If the velocity-time graph is a straight line with a positive gradient, the acceleration is constant and positive.
If the velocity-time graph is a straight line with a negative gradient, the acceleration is constant and negative.
If the velocity-time graph is a curved line, the acceleration is changing.
Without the graph, it is not possible to accurately determine the cyclist's acceleration. Please provide the graph for a more accurate analysis.