Question
Hrge would drif Entional current: the direction ir ssume all batteries and meters are ideal unless otherwlse stat V. Assume edge effects for the electric field of a paraltel plate ent unless otherwise stated VI. For any isolated electrically charged object, the electrie poten defined as zero at infinite distance from the charged o Multiple Choice: Identify the choice that best completes the statement or answers the question 1. When you look at the speedometer in a moving car, you can see the car's a. average distance traveled. b. instantaneous acceleration c. average speed. d. instantaneous speed e, average 2. Acceleration is defined as the CHANGE in a. time it takes to move from one place to another place. b. velocity of an object. c. distance divided by the time interval. d. velocity divided by the time interval. e. time it takes to move from one speed to another speed. 3. Suppose you are in a car that is going around a curve. The speedometer reads a constant 30 of the following is NOT true? a. You and the car are accelerating. b. Your acceleration is constantly changing. c. Your velocity is constant. d. Your direction is constant e. Your speed is constant. As an object falls freely in a vacuum, its a. velocity increases b. acceleration increases 4. e: both A and B. d. none of the above. Suppose an object is in free fall. Each second the object falls a. the same distance as in the second before. b. a larger distance than in the second before. c. with the same instantaneous speed. 5. with the same average s none of the above d. e. A ball tossed vertically upward rises, reaches its highest point, and then falls back to its time the acceleration of the ball is always a. in the direction of motion. b. opposite its velocity. 6. c. directed downward. d. directed upward. 7. When representing velocity as a vector a. the direction of the arrow shows the direction of motion. b. the length of the arrow represents the speed. c. the length of the arrow is drawn to a suitable scale. d. all of the above e. none of the above
Explanation / Answer
1) Option d) is correct.
Instantaneous speed because it is the speed at that INSTANT. It wouldn't be distant because that wouldn't be called a SPEEDomter. And the speedometer tells you the speed you're traveling right there so if you hit a stop light, it goes to zero, if you starts moving on a free way, it goes to 50 mi/hr. Hence, you know it's not average speed.
2) Option d) is correct.
velocity divided by the time interval.
3) Option c) is correct.
Since, velocity is a vector possessing both magnitude(speed) and direction.
Although, the speed is constant, the direction isn't. The direction is changing
in circular motion. So that the velocity is changing.
4) Option a) is correct.
Velocity increases.
5) Option b) is correct.
Acceleration due to gravity is 9.8m/s(2)...so every second of free fall until terminal velocity is reached the object accelerates an additional 9.8m/s.
6) Option c) is correct.
Directed Downward because of the pull of gravity. Gravity's acceleration is 9.8 meters/second.
7) Option d) is correct.
the direction of the arrow shows the direction of motion, length of the arrow represents speed and is drawn to a suitable scale
