Maps of Spacetime - Questions

Coordinate axes
Locating a point
Describing a moving object

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have
(A) t = 0. (B) x = 0. (C) t = x = 0. (D) t = x.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have
(A) t = 0. --- No.
The axes are named after
the coordinate that is not zero.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have
(B) x = 0. --- Yes,
Only the time coordinate
is non-zero along the time axis.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have
(C) t = x = 0. --- No.
That would be the origin.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have
(D) t = x. --- No.
Along the time axis,
that is only true at the origin.

In the following spacetime diagram, which letter is closest to the event with
x = 1, t = 2?
(A) - (B)
(C) - (D)

In the following spacetime diagram, which letter is closest to the event with
x = 1, t = 2?
(A) --- Yes.
One unit along x-axis and then two units parallel to t-axis.

In the following spacetime diagram, which letter is closest to the event with
x = 1, t = 2?
(B) --- No.
That is at x=2, t=2.

In the following spacetime diagram, which letter is closest to the event with
x = 1, t = 2?

(C) --- No.
That is at x = 1, t = 1.

In the following spacetime diagram, which letter is closest to the event with
x = 1, t = 2?

(D) --- No.
That is at x = 2, t = 1.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light?
(a) - (b)
(c) - (d)

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light?
(a) --- No.
That is the world-line of an object at rest.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light?
(b) --- No.
That is the world-line of an object moving in the negative-x direction.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light?

(c) --- Yes.
In unit time, x changes by a positive number less than one.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light?

(D) --- No. That represents a light-ray moving in the positive-x direction.

Maps of Spacetime - Questions Coordinate axes Locating a point Describing a moving object

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have (A) t = 0. (B) x = 0. (C) t = x = 0. (D) t = x.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have (A) t = 0. --- No. The axes are named after the coordinate that is not zero.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have (B) x = 0. --- Yes, Only the time coordinate is non-zero along the time axis.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have (C) t = x = 0. --- No. That would be the origin.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have (D) t = x. --- No. Along the time axis, that is only true at the origin.

In the following spacetime diagram, which letter is closest to the event with x = 1, t = 2? (A) - (B) (C) - (D)

In the following spacetime diagram, which letter is closest to the event with x = 1, t = 2? (A) --- Yes. One unit along x-axis and then two units parallel to t-axis.

In the following spacetime diagram, which letter is closest to the event with x = 1, t = 2? (B) --- No. That is at x=2, t=2.

In the following spacetime diagram, which letter is closest to the event with x = 1, t = 2? (C) --- No. That is at x = 1, t = 1.

In the following spacetime diagram, which letter is closest to the event with x = 1, t = 2? (D) --- No. That is at x = 2, t = 1.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light? (a) - (b) (c) - (d)

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light? (a) --- No. That is the world-line of an object at rest.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light? (b) --- No. That is the world-line of an object moving in the negative-x direction.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light? (c) --- Yes. In unit time, x changes by a positive number less than one.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light? (D) --- No. That represents a light-ray moving in the positive-x direction.

Maps of Spacetime - Questions

Coordinate axes
Locating a point
Describing a moving object

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have
(A) t = 0. (B) x = 0. (C) t = x = 0. (D) t = x.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have
(A) t = 0. --- No.
The axes are named after
the coordinate that is not zero.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have
(B) x = 0. --- Yes,
Only the time coordinate
is non-zero along the time axis.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have
(C) t = x = 0. --- No.
That would be the origin.

In a spacetime diagram with t the time and x the distance, all of the points on the time axis have
(D) t = x. --- No.
Along the time axis,
that is only true at the origin.

In the following spacetime diagram, which letter is closest to the event with
x = 1, t = 2?
(A) - (B)
(C) - (D)

In the following spacetime diagram, which letter is closest to the event with
x = 1, t = 2?
(A) --- Yes.
One unit along x-axis and then two units parallel to t-axis.

In the following spacetime diagram, which letter is closest to the event with
x = 1, t = 2?
(B) --- No.
That is at x=2, t=2.

In the following spacetime diagram, which letter is closest to the event with
x = 1, t = 2?

(C) --- No.
That is at x = 1, t = 1.

In the following spacetime diagram, which letter is closest to the event with
x = 1, t = 2?

(D) --- No.
That is at x = 2, t = 1.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light?
(a) - (b)
(c) - (d)

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light?
(a) --- No.
That is the world-line of an object at rest.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light?
(b) --- No.
That is the world-line of an object moving in the negative-x direction.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light?

(c) --- Yes.
In unit time, x changes by a positive number less than one.

The following spacetime diagram uses c=1 units. Which is the world-line of an object moving in the positive-x direction at less than the speed of light?

(D) --- No. That represents a light-ray moving in the positive-x direction.