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A car is traveling in a straight path due east with a velocity of 8 meters per second. In a 10-second interval, how many meters will the car travel?

Question 1 options:

18m


80m


.8 m


2m

Question 2 (1 point)

Shannon drove her car 140 miles east at a rate of 70 miles per hour. How long did she travel?

Question 2 options:

1 hour


20 hours


20 mins


2 hours

Question 3 (1 point)

A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.

Question 3 options:

5.7 m/s^2


3.5 m/s^2


20 m/s^2


70 m/s^2

Question 4 (1 point)

A person jumps forward off the front of a stationary boat floating on a lake.
Identify the reaction force in this case, between the person and the boat.

Question 4 options:

The person applying a force to the boat pushing it backward.


The boat applying a force on the person pushing her forward.


The boat being pushed down by the air.



The water applying a force on the boat keeping it from sinking.

Question 5 (1 point)
You and your buddy Carol decide to try out for the track team. You both line up to run the 400 meter race. The starting gun fires and you are off! You maintain a quick pace of 10 m/s; Carol passes you at a velocity of 18 m/s. Relative to you, what is Carol's velocity?

Question 5 options:

10 m/s



28 m/s



8 m/s



18 m/s

Question 6 (1 point)
Which would best be explained using Newton's Third Law?

Question 6 options


A larger engine allows a car to accelerate faster.



A car stops short and the passenger moves forward.


A gun moves backward while firing a bullet.


A bicyclist coasts down from the top of a hill.

Question 7 (1 point)
An empty truck and a fully loaded truck are next to each other at a traffic light. When the light turns green, the lighter truck increases speed more quickly. Which of these best explains this situation?

Question 7 options:

Newton's third law


Newton's first law


Newton's second law


Conservation of momentum

Question 8 (1 point)
Why does a skydiver accelerate as she falls to the earth before opening her chute?

Question 8 options:

because fewer forces are present to slow her down as she drops



because she loses mass during her travel



because she gets further from the airplane


because the force of the earth pulls on her

Question 9 (1 point)
A wayward communications satellite is equal distance from the Earth and the moon. Which of these statements is true?

Question 9 options:

The gravitational pull of the moon would be larger.


There wouldn't be any gravitational force acting upon the satellite.


The gravitational force or pull acting on the satellite will be larger from the Earth.


The object will not move because the gravitational pull of the moon and the Earth cancel each other out.

Question 10 (1 point)
Determine the weight of an average physical science textbook whose mass is 3.1 kilograms. The acceleration due to gravity is 9.8 m/s^2

Question 10 options:


3.1 Newtons



30.4 Newtons


0.32 Newtons



6.82 Newtons



Answer :

Answer:Question 1: 80m

We can find the distance traveled by multiplying the velocity by the time interval. Distance = Velocity x Time. In this case, Distance = 8 m/s * 10 s = 80 meters.

Question 2: 2 hours

Shannon traveled 140 miles at 70 miles per hour. Time = Distance / Rate. So, Time = 140 miles / 70 mph = 2 hours.

Question 3: 5.7 m/s^2

We can use the formula a = (v - u) / t, where a is acceleration, v is the final velocity, u is the initial velocity (0 m/s in this case), and t is time. So, a = (20 m/s - 0 m/s) / 3.5 s = 5.7 m/s^2.

Question 4: The person applying a force to the boat pushing it backward.

This is an example of Newton's third law of motion: For every action, there is an equal and opposite reaction. In this case, the person pushes off the boat forward (action), and the boat pushes back on the person with an equal force in the opposite direction (reaction).

Question 5: 8 m/s

Relative velocity is the difference between two velocities. Since you're both moving in the same direction, we simply subtract your velocity from Carol's velocity. So, relative velocity = 18 m/s - 10 m/s = 8 m/s (Carol is moving 8 m/s faster than you).

Question 6: A gun moves backward while firing a bullet.

This is another example of Newton's third law. When the gun fires the bullet forward (action), the gun recoils backward with an equal and opposite force (reaction).

Question 7: Newton's second law

Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. The lighter truck has less mass, and with the same force applied (engine power), it will experience a greater acceleration according to F = ma (force equals mass times acceleration).

Question 8: Because the force of the Earth pulls on her

Gravity from the Earth pulls the skydiver downward, causing her to accelerate.

Question 9: The gravitational pull of the Earth will be larger.

The Earth's mass is significantly larger than the moon's mass. Gravitational force is proportional to mass, so the Earth will exert a stronger gravitational pull on the satellite.

Question 10: 30.4 Newtons

Weight is the force exerted on an object due to gravity. Weight = mass x acceleration due to gravity. Therefore, Weight = 3.1 kg * 9.8 m/s^2 = 30.4 Newtons.

Explanation:

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