are my answers right?

Which object would have the highest gravitational attraction?
A. compact car
B. bicycle
C. semi truck **

As a spaceship travels from Earth to the moon, which value never changes?
A. velocity
B. weight
C. acceleration
D. mass​**

Yes, most massive.

Yes, force changes but not mass.

Yes, your answers are correct.

A. The semi truck would have the highest gravitational attraction due to its larger mass compared to the compact car and bicycle.
D. Mass never changes as the spaceship travels from Earth to the moon.

In order to determine whether your answers are right, we need to analyze the provided questions and options.

Question 1: Which object would have the highest gravitational attraction?

To find the object with the highest gravitational attraction, we need to consider the mass of the given objects. Gravitational attraction between two objects depends on their mass. The greater the mass, the stronger the gravitational attraction.

The options provided are:
A. Compact car
B. Bicycle
C. Semi truck

To determine which object has the highest gravitational attraction, we should know the relative masses of these objects. Typically, a semi truck has the highest mass compared to a compact car or a bicycle. Therefore, option C, the semi truck, is likely to have the highest gravitational attraction.

Question 2: As a spaceship travels from Earth to the moon, which value never changes?

In order to answer this question, we need to understand the concepts associated with the trip from Earth to the moon.

The options provided are:
A. Velocity
B. Weight
C. Acceleration
D. Mass

Let's break down the options:

A. Velocity: Velocity is the rate at which an object changes its position. As the spaceship travels from Earth to the moon, the velocity will change due to the gravitational pull of both celestial bodies. Therefore, velocity is not the correct answer.

B. Weight: Weight is the force of gravity acting on an object. Since the force of gravity changes as the spaceship moves away from Earth and gets closer to the moon, the weight will also change. Therefore, weight is not the correct answer.

C. Acceleration: Acceleration is the rate at which an object's velocity changes. In this context, as the spaceship moves away from Earth and gets closer to the moon, the gravitational force and acceleration due to gravity will change. Therefore, acceleration is not the correct answer.

D. Mass: Mass is the amount of matter an object contains. It remains constant regardless of the location or position of the object. Therefore, the correct answer is D, mass. The mass of the spaceship would not change during the journey from Earth to the moon.

In conclusion, based on the explanations given, you are correct in identifying option C (semi truck) as having the highest gravitational attraction. However, your answer for the second question is not correct. The correct answer is D (mass), not C (acceleration).