To solve this problem, we need to use the concept of vector addition and the principle of equilibrium for constant velocity motion.

Given:

• The object is moving to the west at a constant speed.
• Force 1: 10 N directed due north
• Force 2: 10 N directed due west

Since the object is moving at a constant speed to the west, the net force acting on it must be in the westward direction. This means that the vector sum of all the forces acting on the object must be directed towards the west.

We need to find the third force (Force 3) such that the vector sum of all three forces is directed towards the west.

To find the direction of Force 3, we can use the vector addition method. We first add Force 1 and Force 2 to find the resultant vector, and then Force 3 should be equal in magnitude but opposite in direction to the resultant vector.

The resultant vector of Force 1 and Force 2 can be calculated using the Pythagorean theorem:

Magnitude of the resultant vector = √(10^2 + 10^2) = 10√2 N

The direction of the resultant vector is tan^-1 (10/10) = 45° from the positive x-axis (northwest direction).

Therefore, Force 3 should be directed towards the southeast, with a magnitude of 10√2 N, to counteract the resultant vector and maintain constant velocity towards the west.

The correct answer is D. 10√2 N southeast.

To enable Night mode on your iPhone camera, follow these steps:

1. Open the Camera App: Start by opening the Camera app on your iPhone.
2. Select the Right Mode: Night mode is available on iPhone 11 and later models. It automatically activates in low-light environments when you’re in the Photo mode. Look for the moon icon at the top of the screen, which indicates that Night mode is available.
3. Adjusting Night Mode Manually: If the Night mode icon (moon icon) appears yellow, it means it’s active. You can manually adjust the exposure time by tapping on the moon icon and using the slider that appears to increase or decrease the exposure time, depending on your preference.
4. Stabilize Your Phone: For best results, stabilize your iPhone, either by holding it very steady or using a tripod. Night mode involves longer exposure times, and movement can blur the photo.
5. Take the Picture: Press the shutter button. The camera will take a bit longer to capture the image as it gathers more light during the extended exposure time.

People who play slot machines in gambling casinos usually exhibit steady, rapid rates of responding because slot machines operate on a variable ratio schedule of reinforcement.

A variable ratio schedule of reinforcement is one where a reinforcer (in this case, a win or payout) is delivered after an unpredictable number of responses (pulling the lever or pressing the spin button). This schedule is very effective in maintaining and strengthening behavior because the reinforcement is delivered randomly, and the individual never knows when the next win will occur.

The key characteristics of a variable ratio schedule that make it so effective in sustaining behavior like playing slot machines are:

1. Unpredictability: Since the number of responses required for the next reinforcement is variable and unknown, the player is motivated to continue responding in the hopes of getting a win.
2. Resistance to extinction: Even when a player goes through a long period without a win (extinction), they are likely to continue playing because the reinforcement has been delivered on a variable ratio schedule in the past.
3. High response rate: The variable ratio schedule generates a high and steady rate of responding, as the player keeps pulling the lever or spinning rapidly in an attempt to get the next reinforcement.

The variable ratio schedule is widely used in many gambling games, such as slot machines, because it is highly effective in maintaining and reinforcing the gambling behavior, even in the face of frequent losses. This schedule of reinforcement is one of the reasons why gambling can be so addictive and difficult to stop once initiated.