Question

WILL GIVE BRAINLIEST . PLS ANSWER FAST

What is the average velocity of a vehicle if it travels from a position of -20 meters to a position of 11 meters in 43 seconds? (1 point)
0.94 m/s
7.2 m/s
0.72 m/s
1.0 m/s


Whenever something is thrown up in the air, at what rate does it accelerate back to Earth? (1 point)
9.8 m/s^2
10 m/s
8.9 m/s^s
9.8 m/s


An aircraft has a liftoff speed of 53 m/s. What is the minimum constant acceleration an airplane must have to reach that takeoff speed if the runway is only 420 m long? (1 point)
4 m/s
9.8 m/s^2
2.3 m/s
3.3 m/s^2


A car accelerates uniformly from rest to a speed of 7.6 m/s in 4.6 s. How far does the car travel in that time? (1 point)
21.28 m
17.48 m
21.45 m
18.74 m


What is the correct definition of displacement? (1 point)
the total distance something has traveled
change in position from start point to end point
a scalar quantity with just an amount an no direction
none of the above


At what angle with the ground should a projectile be thrown to reach the maximum distance? (1 point)
90
52
45
0


What are the components of Vector A in the diagram provided? (1 point)

x = 9.5 m left; y = 7.2 m down
x = 11.5 right; y = 9.6 down
x = 9.6 m right; y = 7.2 m up
x = 15 m right; y = 19.9 m up


A baseball is thrown at an angle of 20º relative to the ground at a speed of 25.0 m/s. If the ball was caught 50.0 m from the thrower, how long was it in the air? (1 point)
10 s
5 s
1.2 s
2.1 s


What is the constant horizontal acceleration of a projectile? (1 point)
9.8 m/s^2
-9.8m/s^2
0 m/s^2
it is never constant


Calculate the resultant vector if the components are as follows: x = 7 m and y = 8 m and x and y are at 90 degrees to one another. (1 point)
10.6 m
16.0 m
1.6 m
61.0 m


What is the best definition of inertia? (1 point)
An object's tendency to change its energy
An object's tendency to not stay in motion or at rest
An object's tendency to experience the same force it applies to another object
An object's tendency to stay in motion or at rest unless acted upon by an unbalanced force


A soccer ball is kicked with a force of 15.3 N to the right. The ball accelerates to the right at a rate of 5.6 m/s^2. What is the mass of the ball? (1 point)
2.73 kg
1.85 kg
3.31 kg
3.72 kg


Use Newton's 3rd Law to explain how a rocket ship gets into space. (1 point)
When the engines ignite, they apply a force and accelerates the ship up
When the engines ignite it pushes the ship with a force, changing its velocity
When the engines ignite it changes the ships inertia, allowing it to accelerate
When the engines ignite, they apply a force down and the Earth pushes back allowing the ship to go up


If a person weighs 1000 N on Earth, then that same person is recorded to weigh 2215 N on Planet X, what is the acceleration due to gravity of Planet X? (1 point)
20.83 m/s^2
23.16 m/s^2
33.06 m/s^2
40.98 m/s^2


Which one is an example of a contact force? (1 point)
Normal force
Magnetic force
Gravitational force
Electrical force


Why does changing where you pinch the string on an instrument such as a guitar change the frequency of that note? (1 point)
Frequency and length are directly proportional to each other
Frequency and length are inversely proportional to each other
Frequency and length only depend on the force applied to the string
None of the above


A wave of wavelength 24 cm travels with frequency 32 Hz. What is the speed of the wave? (1 point)
54.7 m/s
9.66 m/s
768 m/s
7.68 m/s


A musician is building his own guitar. The strings have a length of 75 cm between fixed points. One of the strings has a mass per unit length of 50 g/m and a fundamental frequency of 50 Hz. Calculate the frequency of the third overtone. (1 point)
150 Hz
281 Hz
200 Hz
443 Hz


How do you figure out the wavelength of a wave on a graph? (1 point)
Crest to crest
Crest to trough
Crest to rarefaction
Crest to compression


Which of the following is considered a mechanical wave? (1 point)
Radio waves
P and S waves of an Earthquake
Light waves
microwaves


A police car is driving down the street with it's siren on. You are standing still on the sidewalk beside the street. If the frequency of the siren is 1500 Hz and the car is moving towards you at 15 m/s, what is the frequency you would hear from the siren? (v of sound in air = 343 m/s) (1 point)
1676.92 Hz
2019.11 Hz
1321.43 Hz
1568.60 Hz

Answer 1

1) Average velocity: 0.72 m/s

2) Acceleration: $9.8 m/s^2$

3) Acceleration of the plane: $3.3 m/s^2$

4) The distance covered is 17.48 m

5) Displacement is the change in position from start point to end point

6) The maximum distance is reached when the angle is 45 degrees

7) Diagram is not provided

8) Time of flight: 2.1 s

9) Horizontal acceleration: $0 m/s^2$

10) Resultant vector: 10.6 m

11) Inertia: An object's tendency to stay in motion or at rest unless acted upon by an unbalanced force

12) The mass of the ball is 2.73 kg

13) When the engines ignite, they apply a force and accelerates the ship up

14) The acceleration due to gravity on planet X is $21.72 m/s^2$

15) Contact force: normal force

16) Frequency and length are inversely proportional to each other

17) Speed of the wave: 7.68 m/s

18) Frequency of 3rd overtone: 200 Hz

19) Wavelength of a wave on a graph is measured crest to crest

20) P and S waves of an Earthquake are mechanical waves

21) Apparent frequency: 1568.60 Hz

Explanation:

See attached document (answer too long, so I had to attach it into a separate document).

Learn more about:

Acceleration:

brainly.com/question/9527152

brainly.com/question/11181826

brainly.com/question/2506873

brainly.com/question/2562700

Newton Laws of motion:

brainly.com/question/11411375

brainly.com/question/3820012

Waves:

brainly.com/question/5354733

brainly.com/question/9077368

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