The Gravitational Field - Questions

Local action
The abstraction becomes real

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to
(A) 2N. (B) 3N. (C) 6N. (D) 20N.

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to
(A) 2N. --- No.
The field magnitude is F/m so
F is the magnitude multiplied by m.

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to
(B) 3N. --- No.
The force is just the weight W = mg.

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to
(C) 6N. --- Yes,
W = mg = (2kg)(3m/s)

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to
(D) 20N. --- No.
W = mg but remember that here, g = 3m/s.

In Newton's theory, the gravitational field propagates
(A) at the speed of light.
(B) at zero speed.
(C) at infinite speed.
(D) at a variable speed.

In Newton's theory, the gravitational field propagates
(A) at the speed of light. --- No.
Not in Newton's theory.

In Newton's theory, the gravitational field propagates
(B) at zero speed. --- No.
Changes in the positions of objects
would never have any effect
on their gravitational fields in that case.

In Newton's theory, the gravitational field propagates
(C) at infinite speed. --- Yes.
As soon as an object moves,
its gravitational field changes everywhere
(in Newton's theory).

In Newton's theory, the gravitational field propagates
(D) at a variable speed. --- No.
Objects themselves may move at variable
speeds but the information about how they
move travels instantaneously and is
reflected by gravitational field changes
everywhere (in Newton's theory).

The Gravitational Field - Questions Local action The abstraction becomes real

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to (A) 2N. (B) 3N. (C) 6N. (D) 20N.

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to (A) 2N. --- No. The field magnitude is F/m so F is the magnitude multiplied by m.

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to (B) 3N. --- No. The force is just the weight W = mg.

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to (C) 6N. --- Yes, W = mg = (2kg)(3m/s)

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to (D) 20N. --- No. W = mg but remember that here, g = 3m/s.

In Newton's theory, the gravitational field propagates (A) at the speed of light. (B) at zero speed. (C) at infinite speed. (D) at a variable speed.

In Newton's theory, the gravitational field propagates (A) at the speed of light. --- No. Not in Newton's theory.

In Newton's theory, the gravitational field propagates (B) at zero speed. --- No. Changes in the positions of objects would never have any effect on their gravitational fields in that case.

In Newton's theory, the gravitational field propagates (C) at infinite speed. --- Yes. As soon as an object moves, its gravitational field changes everywhere (in Newton's theory).

In Newton's theory, the gravitational field propagates (D) at a variable speed. --- No. Objects themselves may move at variable speeds but the information about how they move travels instantaneously and is reflected by gravitational field changes everywhere (in Newton's theory).

The Gravitational Field - Questions

Local action
The abstraction becomes real

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to
(A) 2N. (B) 3N. (C) 6N. (D) 20N.

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to
(A) 2N. --- No.
The field magnitude is F/m so
F is the magnitude multiplied by m.

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to
(B) 3N. --- No.
The force is just the weight W = mg.

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to
(C) 6N. --- Yes,
W = mg = (2kg)(3m/s)

The force on a 2kg object in a gravitational field whose magnitude is 3m/s is equal to
(D) 20N. --- No.
W = mg but remember that here, g = 3m/s.

In Newton's theory, the gravitational field propagates
(A) at the speed of light.
(B) at zero speed.
(C) at infinite speed.
(D) at a variable speed.

In Newton's theory, the gravitational field propagates
(A) at the speed of light. --- No.
Not in Newton's theory.

In Newton's theory, the gravitational field propagates
(B) at zero speed. --- No.
Changes in the positions of objects
would never have any effect
on their gravitational fields in that case.

In Newton's theory, the gravitational field propagates
(C) at infinite speed. --- Yes.
As soon as an object moves,
its gravitational field changes everywhere
(in Newton's theory).

In Newton's theory, the gravitational field propagates
(D) at a variable speed. --- No.
Objects themselves may move at variable
speeds but the information about how they
move travels instantaneously and is
reflected by gravitational field changes
everywhere (in Newton's theory).