Help me out! Thanks! You guys have really helped me before.
Question 1
What does the law of inertia say about the velocity and acceleration of a body that is subject to no external influences?
a) The velocity slows to zero as the object decelerates.
b) The speed can change but the direction of the velocity remains constant. The acceleration is along the same line as the velocity.
c) The velocity does not change, and the acceleration is zero.
d) The speed remains constant, but the direction of the velocity can change. All acceleration is perpendicular to the velocity.
Question 2
A car accelerates from a velocity of 10 m/s to 40 m/s in 1 minute. What is the acceleration of the car in units of m/s/s?
Question 3
A multiple flash photo is taken of a ball, which is thrown in the air. Another flash photo is taken of the same ball on its way back down. If there is no air friction, the following best describes the two pictures.
a. The first photo looks the same as the second one flipped upside down.
b. The second photo has equally spaced distance intervals while the first does not.
c. The first photo looks the same as the second one.
d. The first photo has equally spaced distance intervals while the second does not.
Question 4
An object is released above the ground and falls freely. Which of the following statements is true?
1. The velocity is greater at the top than at the midpoint and greater at the midpoint than at a point near the bottom.
2. The velocity is greater at a point near the bottom than at the midpoint and greater at the midpoint than at the top.
3. The acceleration is greater at a point near the bottom than at the midpoint and greater at the midpoint than at the top.
4. The acceleration is constant throughout the fall.
a) I and III
b) II and III
c) II and IV
d) I and IV
Question 5
Describe how you could use a stopwatch and a meter stick to measure a moving object's speed.
a) Use the stopwatch to measure the time for the moving object to travel between two points. Then, use the meter stick to measure the distance between the points. Divide the distance by the time.
b) Use the stopwatch to measure the time for the moving object to travel between two points. Then, use the meter stick to measure the distance between the points. Subtract the time from the distance.
c) You cannot measure speed with a meter stick and a stopwatch.
d) Use the stopwatch to measure the time for the moving object to travel between two points. Then, use the meter stick to measure the distance between the points. Divide the time by the distance
I will be happy to critique your thinking or work.
I meant help give me links for help. Someone else on the site did that and helped me.
Now...I do guesswork and hope for the best.
thanks...........
1 answer
3 answers