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### String Theory: Insight from the Holographic Principle

Another key insight into string theory comes from the *holographic principle,* which relates a theory in space to a theory defined only on the boundary of that space. The holographic principle isn’t strictly [more…]

### How Gravity Affects the Acceleration of an Object on an Inclined Plane

You can use physics to determine how gravity affects the acceleration of an object as it moves along an inclined plane. When you’re on or near the surface of the Earth, the pull of gravity is constant. [more…]

### Finding the Force of Gravity along an Inclined Plane

You can use physics to determine the force of gravity on an object that moves along an inclined plane. You can break the weight of the object down into components that are parallel to and perpendicular [more…]

### Finding the Velocity of an Object Moving along an Inclined Plane

In physics, you can calculate the velocity of an object as it moves along an inclined plane as long as you know the object’s initial velocity, displacement, and acceleration. Just plug this information [more…]

### How to Calculate the Maximum Height of a Projectile

According to the laws of physics, when a projectile flies into the air, its trajectory is shaped by Earth’s gravitational pull. Because the force of gravity only acts downward — that is, in the vertical [more…]

### How to Calculate How Long a Projectile Is Airborne

When you launch a projectile into the air, you can use physics to determine how long it will remain airborne. Because the force of gravity only acts downward — that is, in the vertical direction — you [more…]

### Newton’s Law of Universal Gravitation

Sir Isaac Newton came up with one of the heavyweight laws in physics for you: the law of universal gravitation. This law says that every mass exerts an attractive force on every other mass. If the two [more…]

### How to Calculate the Force of Gravity on the Earth’s Surface

Starting with the physics equation for the force of gravity, you can plug in the mass and radius of the Earth to calculate the force of gravity near the surface of the Earth. [more…]

### How to Calculate a Satellite’s Speed around the Earth

In space, gravity supplies the centripetal force that causes satellites (like the moon) to orbit larger bodies (like the Earth). Thanks to physics, if you know the mass and altitude of a satellite in orbit [more…]

### How to Calculate the Period and Orbiting Radius of a Geosynchronous Satellite

When a satellite travels in a geosynchronous orbit around the Earth, it needs to travel at a certain orbiting radius and period to maintain this orbit. Because the radius and period are related, you can [more…]

### Calculate the Velocity Necessary to Counteract Gravity in a Loop

If you know the radius of a circular track, you can use physics to calculate how fast an object needs to move in order to stay in contact with the track without falling when it reaches the top of the loop [more…]

### How Changing Depth Affects Pressure

You know that pressure increases the farther you go underwater, but by how much? As a physicist, you can put some numbers in and get numerical results out. Just what pressure would you expect for a given [more…]

### How to Calculate Work That Is Opposite the Direction of an Object’s Motion

In physics, if a force on an object has a component in the same direction as the motion, the work that force does on the object is positive. If a force on an object has a component in the opposite direction [more…]

### Calculate the Range of a Projectile Fired at an Angle

If you fire a projectile at an angle, you can use physics to calculate how far it will travel. When you calculate projectile motion, you need to separate out the horizontal and vertical components of the [more…]

### How to Calculate the Specific Gravity of a Substance

In physics, a substance’s *specific gravity* is the ratio of that substance’s density to the density of water at 4 degrees Celsius. Because the density of water at 4 degrees Celsius is 1,000 kg/m [more…]