197 Answered Questions for the topic AP physics

13d

#### The change of reaction

In the reaction C2H5OH + 3O2-> 2CO2 + 3H2O, the change of enthalpy was deltaH= -1235.7 kj/mol. What heat lost or gained in the reaction?

14d

#### need help with physics question

We literally just started this chapter and I can't register a single thing in my brain. Pls help outA cylindrical object can roll down an incline. The incline is slightly less than one meter in...
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12/19/19

#### Impulse Question Plz need help ASAP

A punter drops a ball from rest vertically 1 meter down onto his foot. The ball leaves the foot with a speed of 27 m/s at an angle 60° above the horizontal. What is the impulse delivered by the...
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12/01/19

#### help w/ physics

Astronauts in low earth orbit on the ISS are orbiting at an altitude of about 109 km above the surface of the earth. it takes about 93 minutes for an astronaut to orbit the earth once at this...
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11/30/19

#### physics question

A child decides to sled down a 12 m tall hill. They reach the bottom with a speed of 14 m/s. What percentage of their initial mechanical energy was lost due to friction?a) 17% orb) 9%

11/30/19

#### need help with physics

You are asked to pull a 120.0 kg crate at a constant velocity across a level concrete floor with an effective kinetic coefficient of friction = 0.7 . How much work will you need to do to pull the...
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11/27/19

#### physics question

A 2.5 kg rubber ball is dropped from rest 5.0 m above ground. Upon its rebound, the ball only reaches a height of 4.0 m. How much energy was dissipated during the bounce? Please ignore losses due...
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11/27/19

#### Physics question

A child at a summer camp runs towards a 5 in rope at a speed of 4 m/s, grabbing on to the bottom of the rope. What will be the change in elevation for the child's center of gravity as she and the...
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11/08/19

#### An amusement park ride consists of a rotating circular platform 8.07 m in diameter from which 10 kg seats are suspended at the end of 2.87 m massless chains.

An amusement park ride consists of a rotating circular platform 8.07 m in diameter from which 10 kg seats are suspended at the end of 2.87 m massless chains. When the system rotates, the chains...
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11/04/19

#### AP physics question for homework

a projectile is launched from ground level to the top of a cliff which is 135m tall. The projectile is shot with an initial velocity of 75m/s at an angle of 60 degrees with the horizontal.A) draw a...
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10/31/19

#### Projectile Motion on the Moon problem!

On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The free-fall acceleration on the moon is 1/6 of its value on earth. Suppose he...
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10/28/19

#### Open Stax Help!

A boy standing on a bridge over a river 30.0 m below drops a stone straight down and finds that it takes 2.0 seconds to hit the water. Assume that the acceleration of the stone is 9.8...
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10/25/19

#### physics question

A car with speed v and an identical car with speed 2v both travel the same circular section of an unbanked road. If the frictional force required to keep the faster car on the road without skidding...
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10/22/19

#### Projectile Motion

A projectile is launched at ground level with an initial speed of 50.0 m/s and an elevation angle (i.e., at an angle above the horizontal) of 30.0°. It strikes a target above the ground 3.00 s...
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10/19/19

#### Tension Problem

A block of mass m = 4.50 kg rides on top of a second block of mass M = 15.0 kg. A person attaches a string to the bottom block and pulls the system horizontally across a frictionless surface as in...
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10/14/19

#### The 100m dash can be run by the best sprinters in 10.0 s.

A 65 kg sprinter accelerates uniformly for the first 50m to reach top speed, which he maintains for the remaining 50 meters.a) What is the average horizontal component of force exerted on his feet...
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09/29/19

#### Two identical objects start at the same height above level ground. Simultaneously, object A is launched at an angle of 30° above horizontal and object B is launched at angle of 30° below horizontal.

Two identical objects start at the same height above level ground. Simultaneously, object A is launched at an angle of 30° above the horizontal and object B is launched at an angle of 30° below the...
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09/29/19

#### Two identical objects start at the same height above level ground. Simultaneously, object A is dropped and object B is launched horizontally with a speed of 20 m/s.

Two identical objects start at the same height above level ground. Simultaneously, object A is dropped and object B is launched horizontally with a speed of 20 m/s. Assume that air resistance is...
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09/27/19

#### Coefficient of Static Friction Physics Problem

A box that weighs 50 N is pulled by a force of 10 N. The coefficient of static friction between the box and the ground is 0.5. Describe what will happen to the box? Will it start moving? Will it...
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09/22/19

#### A rocket is initially at rest. The rocket accelerates upward from ground level at 7.5 m /s^2 for 100 s. The engine is then shut off. What is the maximum height reached by the rocket?

the answer is 66000 m i just don't know how to get there

09/20/19

#### traveling on a highway

Suppose you are traveling on a highway at 35 m/s west. Seven seconds later you are traveling 20 m/s northwest. What the magnitude of your acceleration in m/s2 to the nearest tenth? What was the...
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09/13/19

#### Projectile Motion AP Physics

A plane drops a hamper of medical supplies from a height of 3620 m during a practice run over the ocean. The plane’s horizontal velocity was 107 m/s at the instant the hamper was dropped. What is...
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08/29/19

#### What is the speed of the earth as it orbits the sun in km/hr? In m/s? Orbital radius =1.5x10^11m)

What is the speed of the earth as it orbits the sun in km/hr? In m/s? Orbital radius =1.5x10^11m)

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