Help wit physics please?

Question

Hey this test was kinda hard for me
i did my best but i don't know how well it turned out probably not very good
please help and correct my answers any help would be nice.

my answers look like this <===|


How long does it take light, traveling at 3.0 x 105 km/s, to reach the earth from the sun, 1.5 x 108 km away?
330s
500s <===|
1020s
78s

2: Two runners, A and B, start at the same instant over a 2.0 km course. Runner A covers the entire course at 10 km/h. Runner B runs 1 km at 11 km/h and the other kilometer at 9 km/h. By how many seconds does the winner beat his opponent?
7.3 s <===|
6.8 s
0.0 s
8.4 s

3: A parachute jump of 13400 m was made by Arabella Richardson. The time of descent was 23 min, 50 s. Calculate the average velocity during the drop.
9.37 m/s <===|
11.2 m/s
Dimensions
17.5 m/s

4: A train from New York City to Miami is scheduled to cover the 597 km distance to Richmond in 7 h, 15 min and to make the entire run of 2230 km in 26 h, 35 min. On a particular trip the train was 2 h late at Richmond and 3 h late a Miami. Calculate the average speeds of the train from Richmond to Miami.
84.6 km/h
80.31 km/h <===|
75.4 km/h
73.1 km/h

5: If you drive 100 miles in two hours your average speed will be:
75 mi/hr <===|
100 mi/hr
50 mi/hr
200 mi/hr

6: How long does it take a car to accelerate from 10 m/sec to 35 m/sec while going to the right at a constant acceleration of 5 (m/sec)/sec to the right?
3 Seconds
7 Seconds
5 Seconds <===|
15 Seconds

7: The change in velocity over time defines what?
Velocity
Force
Distance
Acceleration <===|

8: Your cow is standing on the tracks as a train is rapidly approaching! You are able to give the cow an acceleration of 20 m/s^2. How much time will it take you to pull the cow 2 meters to safety?
0.7 Seconds
0.4 Seconds <===|
1.1 Seconds
0.9 seconds

9: Resolve a displacement of 700 cm into two components along direction lines that lie on opposite sides of the displacement and each of which makes an angle of 30° with the displacement.
404 cm and 478 cm <===|
404 cm each
383 cm and 415 cm
415 cm each

10: Which of the following sentences contains an example of instantaneous velocity?
The car covered 500 kilometers in the first 10 hours of its northward journey.
19.6 m/sFive seconds into launch the rocket was shooting upward at 5000 meters per second. <===|
The cheetah can run at 70 miles per hour.
Moving at 5 kilometers per hour, it will take us eight hours to get to the base camp.

11: For questions 11,12,and 13, consider this situation: A student throws a ball up in the air with an initial velocity of 12 m/s and then catches it as it comes back down to him. a) What is the ball's velocity when he catches it?
16.4 m/s down
12 m/s down <===|
18.2 m/s down
10.8 m/s down

12: How high does the ball travel?
6.8 m
6.4 m
7.3 m <===|
7.8 m

13: How long does it take the ball to reach its highest point?
1.2 s <===|
2.4 s
0.8 s
1.9 s

14: The tendency of an object to resist change in velocity is called:
Equilibrium
Inertia <===|
Motion
Force

15: An athlete runs four laps of a 400 m track. What is the athlete's total displacement?
-1600 m
-400 m
0 m
400 m <===|

16: As a baseball is being caught, its speed goes from 30.0 m/s to 0.0 m/s in 0.0050 s. What is the baseball's acceleration?
-8.0 x 103m/s2
-8.0 x 102m/s2 <===|
-6.0 x 103m/s2
-6.0 x 104m/s2

17: Which of the following statements contains a reference to displacement?

I. The town is a five mile drive down a winding country road."

II. "The town sits at an altitude of 940 m."

III. "The town is ten miles north, as the crow flies."
I only
III only <===|
I and III only
II and III only

18: Questions 18 and 19 refer to a car that travels from point A to point B in four hours, and then from point B back to point A in six hours. The road between point A and point B is perfectly straight, and the distance between the two points is 240 km. What is the car's average velocity?
0 km/h
42 km/h
48 km/h <===|
60 km/h

19: What is the car's average speed?
0 km/h <===|
48 km/h
50 km/h
100 km/h

20: What kind of quantity is a force?
Unit
Scalar
Vector
None of the above <===|

Answer 1

Best Answer - Chosen by Voters

Too many problems for me, but I checked #1, #3, #5.and #7.

#1 and #3 and #7 are correct.
#5 is incorrect. The answer is 50 m/s
.......(Speed = distance over time)