All categories

3 years ago

Which situation describes a system with decreasing gravitational potential energy?

1 answer:

8 0

An example of a system with decreasing gravitational potential energy is a ball in free fall.

At its initial height h, the ball has a gravitational potential energy equal to
$U=mgh$
where m is the ball mass and g is the gravitational acceleration. As the ball falls toward the ground, its height h decreases, and so its gravitational potential energy decreases as well, according to the formula
$U=mgh'$
where h' is the new height of the ball.

You might be interested in

A hiker leaves her camp and walks 3.5 km in a direction of 55° south of west to the lake. After a short rest at the lake, she hi

Nezavi [6.7K]

Answer:

resultant displacement ( maybe ) is

3.658km E 80.8° S

Explanation:

resolve the components into vertical and horizontal forms. Find the vector sum of each . uisng Pythagoras theorem find the resultant and using sohcahtoa find the direction

5 0

3 years ago

When you ride a bicycle, in what direction is the angular velocity of the wheels? When you ride a bicycle, in what direction is

Hitman42 [59]

Complete question is;

When you ride a bicycle, in what direction is the angular velocity of the wheels? A) to your left B) to your right C) forwards D) backwards

Answer:

Option A - to your left

Explanation:

While an object rotates, each particle will have a different velocity:

the 'Speed' component will vary with radius while the 'Direction' component will vary with angle.

All of the velocity vectors are aligned in the same plane.

We can be solve this by choosing a single vector normal to ALL of the possible velocity vectors of the rotating object in that plane.

This convention used is known as "Right-hand rule". The angular velocity vector points along the wheel's axle. For instance, if you Imagine wrapping your right hand around the axle so that your fingers point in the direction of rotation, with your thumb sticking out. You will notice that your thumb points to the left.

Thus;

By right-hand rule, a wheel rotating on a forward - moving bicycle has an angular velocity vector pointing to the rider's left.

So, option A is the correct answer

3 0

3 years ago

Which is a FALSE statement about elements? Select one: a. Each element has its own neutron number. b. Each element has its own a

Nata [24]

It is A. Number of neutrons can differ with and be the same any given element.

3 0

3 years ago

A race car rounding a corner at a constant speed of 200 miles per hour.

ICE Princess25 [194]

Answer:

Yes since it is changing direction

Explanation:

A race car rounding a corner at a constant speed of 200 miles per hour

6 0

2 years ago

George is applying a downward force of 50N to and object that has a mass of 50kg. What is the normal force (FN) of the object wh

attashe74 [19]

The normal force acting on the object is 500 N in the upward direction

<u>Explanation:</u>

As George is applying a downward force, the normal force will be in the upward direction. The normal force will be exerted due to the acceleration due to gravity exerted on the object.

So, as per Newton's second law, the normal force acting on the object can be measured by the product of mass of the object and the acceleration due to gravity acting on the object.

But as the acceleration due to gravity is a downward acting acceleration and the normal force is a upward acting force, so the acceleration will be having a negative sign in the formula.

$Normal\ force = Mass \times Acceleration\ due\ to\ gravity$

Here, acceleration due to gravity g = -10 m/s² and mass is given as 50 kg, then

Normal force = 50 × (-10) = -500 N

So, the normal force acting on the object is 500 N in the upward direction.

3 0

3 years ago