In the question stem, we're told that two forces of equal magnitude are pointing south and the other east. We're then asked to find which way the third force must be oriented in order to cancel out the other two forces. To figure this out, it's best to draw a force diagram.

Looking at this force diagram, we actually don't even need to do any math in order to realize that the resultant force from these two forces will point in the southeast direction. Consequently, the third force will need to point in the opposite direction in order to balance things out; the third force must be oriented in the northwest direction.

As can be seen in the diagram, the force pushing down the ramp is equal to

The force pushing the object into the ramp is

The force into the ramp will be equal to the normal force, thus

The net force pushing the woman down the ramp is

At the moment she starts slipping, the net force is equal to zero

Solving for :

Because the block is resting on an inclined surface, only a component of the gravitational force will contribute to the normal force between block and ramp. It can be assumed that the only relevant force acting on this block is due to gravity.

Since the normal force only acts in the direction perpendicular to the contact surface, the correct gravitational force component to take is the perpendicular component. This gives . By plugging in the known values for , and  , we get 

The tensions in both ropes are caused by the bucket being pulled down by gravity, hence the only relevant forces acting in this scenario are those in the y-direction. Since the bucket is being held up against gravity, the upward forces should balance exactly with the downward forces. The forces in the y-direction can be balanced like this:

, where  is the tension in rope 1. Thus we find that:

Conservation of momentum gives that the angular momentum of the golf swing is transferred into linear momentum for the ball, or that , so that the velocity of the ball immediately after the swing is .

Using kinematics, we know that , so that substituting gives .

Kinetic friction can be expressed as , so by substituting for  in the previous equation, we get

Plugging in known values and solving for  gives  and 

Solving for 

Plugging in values

Scalar quantities are those that can be described with magnitude only, as opposed to vectors, which include both magnitude and direction components. Distance, speed, and time are all scalars. Displacement is not a scalar, as it involves both the distance and the direction moved from a starting point. Velocity also includes a direction component, and is therefore a vector quantity.

According to Newton's second law,

There are two forces acting on the person standing on the scale in the elevator. Those two forces are the person's weight due to gravity (which acts in a downward direction), and the normal force from standing on the scale (which acts in an upward direction).  So, the net force equation can be written as:

 represents the person's weight, which was given in the problem to be 700 N.   is the normal force due to standing on the scale; this is what we are trying to find, because it is what the scale would read. We subtract the two forces because they point in opposite directions, and so one must be positive and the other negative.

We also know the acceleration, , is .

We were not given the mass of the person, but we can find it because we know the person's weight is 700 N. The equation that relates a person's mass to their weight near the surface of the Earth is:

Now we can solve for the normal force by using the mass we found in the original equation above:

The answer is exemplified by the centripetal force equation: 

.

When we combine the units of each of the equation's components, we arrive at

 which, when simplified, becomes