# Are ocean tides greater in December or June?

Taking the sun’s tidal force into account, on a world average, ocean tides are greater in (December) (June) (no difference).

## What is the shape of the 8 km S curve?

Since the satellite moves at 8 km/s, it “falls” at the same rate Earth “curves.” A satellite in orbit around Earth traces an oval-shaped path called an ellipse. An ellipse is the closed path taken by a point that moves in such a way that the sum of its distances from two fixed points is constant.

## What two kinds of PE are changing during the slowing down interval?

What two kinds of PE are changing during the slowing-down interval? Sedan; same force applied over a longer time produces more impulse. Sedan; greater impulse means greater change in momentum.

## How does gravitational attraction vary with the distance of separation?

Since gravitational force is inversely proportional to the square of the separation distance between the two interacting objects, more separation distance will result in weaker gravitational forces. So as two objects are separated from each other, the force of gravitational attraction between them also decreases.

## Why doesn’t the force of gravity change the speed?

15. Why doesn’t the force of gravity change the speed of a satellite in circular orbit? In circular orbit the force of gravity is everywhere perpendicular to the satellite’s path (like the radius of a circle is perpendicular to the circumference). There’s simply no component of force along the path to change speed.

## What happens if a satellite slows down?

If the satellite slows down it would crash into the object it is orbiting. If the satellite speeds up, it may spin off into space. The satellite could be knocked or moved closer or farther from the object it is orbiting.

## How do you calculate collision force?

Keep in mind that acceleration is an object’s change in speed over time. Objects involved in crashes usually decelerate–the numerically negative form of acceleration–to a stop. Calculating the amount of force involved in a crash is as simple as multiplying the mass of the crashing object by its deceleration.

## What is common electric potential difference called?

ELECTRIC POTENTIAL DIFFERENCE Units of potential difference are joules per coulomb, given the name volt (V) after Alessandro Volta. The familiar term voltage is the common name for electric potential difference.

## What is the relationship between impulse and momentum?

The momentum of the object is given by the product of mass and velocity while the impulse is the change of momentum when a large force is applied on an object for a short interval of time. In a collision, the impulse experienced by an object is equal to the change in momentum.

## What is a high tide called?

A horizontal movement of water often accompanies the rising and falling of the tide. This is called the tidal current. The incoming tide along the coast and into the bays and estuaries is called a flood current; the outgoing tide is called an ebb current.

## Why are there 2 high tides per day?

Because the Earth rotates through two tidal “bulges” every lunar day, coastal areas experience two high and two low tides every 24 hours and 50 minutes. High tides occur 12 hours and 25 minutes apart. It takes six hours and 12.5 minutes for the water at the shore to go from high to low, or from low to high.

## Does the Earth’s tilt affect tides?

The spin of the earth on it’s axis does create a centrifugal force but this is even around the circumference and very small compared to gravity so there is a very, very, slight increase in the earth’s diameter at the equator, but no effect on the tides.

## What are the 3 laws of gravity?

In the first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact, they apply forces to each other of equal magnitude and opposite direction.

## What variables affect gravity?

Gravity is affected by the size of an object and the distance between the objects. When the mass of an object increases the force of gravity increases as well. If an object’s weight is greater than the other object’s weight, then the object with the greater weight will land first.

## What is the first law of gravity?

There is only one law on gravitation proposed by Newton. According to Newton’s law of gravitation, any two objects in the universe attracts each other with a force equal to the product of their masses and inversely proportional to the square of the distance between them.

## Does gravity create time?

The gravitational field is really a curving of space and time. The stronger the gravity, the more spacetime curves, and the slower time itself proceeds.

## Does light create gravity?

Light has energy, energy is equivalent to mass, and mass exerts gravitational force. Thus, light creates gravity, i.e. the bending of space-time.

## Does gravity bend light?

Gravity bends light Light travels through spacetime, which can be warped and curved—so light should dip and curve in the presence of massive objects. This effect is known as gravitational lensing GLOSSARY gravitational lensingThe bending of light caused by gravity .

## Do satellites need fuel?

Once a satellite is in position above Earth it needs a method of propulsion to make sure it can move if needed, avoiding space debris, compensating for drag over time, and even de-orbiting itself at the end of its mission. The current standard propellant for satellites is hydrazine-based fuel, which is highly toxic.

## How many dead satellites are in space?

While there are about 2,000 active satellites orbiting Earth at the moment, there are also 3,000 dead ones littering space. What’s more, there are around 34,000 pieces of space junk bigger than 10 centimetres in size and millions of smaller pieces that could nonetheless prove disastrous if they hit something else.

## How long can a satellite stay in orbit?

A satellite has a useful lifetime of between 5 and 15 years depending on the satellite. It’s hard to design them to last much longer than that, either because the solar arrays stop working or because they run out of fuel to allow them to maintain the orbit that they’re supposed to be in.

## What are 3 types of collisions?

Collisions are of three types: perfectly elastic collision. inelastic collision. perfectly inelastic collision.

## What is impact formula?

F = mv/2t. => m = 2Ft/v. = 2 (10) (4) / 5. = 16 kg. Problem 4: Calculate the velocity of the body if the impact force acting on an object is 14 N mass is 2 kg for 2 seconds.

## What is the unit of momentum?

Therefore, the unit for momentum can be Newton-second (Ns). In the CGS system, if the mass is in grams and the velocity in centimeters per second, then the unit of momentum will be gram-centimeters per second (g⋅cm/s).

## What is the SI unit of resistance?

The SI unit of electric resistance is the ohm (Ω). 1 Ω = 1 V/A.