01/28/22

#### physics power output

Someone runs up 115 flights of stairs totaling 2067 steps in 12 min 47s . If the height of each step was 0.31 m and the mass of the runner was 85,0 kg what was his average power output during the... more

10/20/21

#### Why is normal force included in the calculation of either static or kinetic friction?

Please explain why is normal force always included in calculating the static or kinetic friction

#### Newton's Second Law of Motion - Basic Problem

Please do provide a detailed step-by-step solution and a final answer.A truck with a mass of 3,500 kg, including the passengers, has an engine that produces a net horizontal force of 525 N.... more

10/18/21

#### Approximately the diameter of proton is 0. 000 000 000 001 m. How do we express it in Scientific Notation?

A. 1 x 10⁻¹¹ m B. 1 X 10⁻¹² mC. 1 x 10¹² mD. 1 x X 10¹¹ m

10/16/21

#### Ap physics, needed all work steps and list all the variables, value and units

A 15,680 N car, initially traveling at 20 m/s, applies a braking force of 640 N. The car comes to a complete stop.   Determine the car’s mass in [kg]. Determine the car’s initial momentum in [kg... more

10/16/21

#### When can you use the Range Equation when trying to solve a Kinematics problem?

What do you look for to know you can use it?

10/14/21

#### Finding the time and speeds at which the front and back of a train pass a post.

Hello,I need help figuring out the following question: A train has a length of 44 m. The front of the train is 100 m from a post. It accelerates at 0.5 m/s^2. a) What is the time interval between... more

10/14/21

#### What is the ratio of rotational kinetic energy for two balls, each tied to a light string and spinning in a circle with a radius equal to the length of the string?

The first ball has a mass m attached to a string of length L, rotates at a rate of w and has rotational kinetic energy K1rotational .The second ball has a mass 2m attached to a string of length 2L... more

10/13/21

Using the Pythagorean Theorem for Right Angles c2 = a2 + b2 to find the resultant vector. Please show your work for credit on this this problem. Explain how you solved for the resultant or orange... more

10/13/21

#### A block of unknown mass is at rest on a smooth, hotizontal surface. A horizontal force of 47 N causes the block to accelerate at 4.2 m/s2. What is the weight of the block?

A block of unknown mass is at rest on a smooth, hotizontal surface. A horizontal force of 47 N causes the block to accelerate at 4.2 m/s2. What is the weight of the block?I know there are two... more

10/11/21

#### A car accelerates at 2.7 m/s/s for 5.4 s, reaching a speed of 18 m/s. During the period of acceleration, the car travels a distance of...

A car accelerates at 2.7 m/s/s for 5.4 s, reaching a speed of 18 m/s. During the period of acceleration, the car travels a distance of...I know how to find acceleration and velocity but I'm stuck.... more

10/06/21

#### ap physics problem

in the jupiter gravitional acceleration is about, 90m/s^2. If an object falls from a height of 720m, what will be the velocity of object when it hits the ground.

10/06/21

#### ap physics problem

in the moon gravitional acceleration is about 2m/s^2. How many seconds does it take for an object to fall from a height of 121

10/04/21

#### What is the minimum work needed to push a 850 -kg car 750 m up along a 9.5 ∘ incline? Ignore friction. Express your answer to two significant figures and include the appropriate units.

What is the minimum work needed to push a 850 -kgkg car 750 mm up along a 9.5 ∘∘ incline? Ignore friction.Express your answer to two significant figures and include the appropriate units.

10/04/21

#### A spring with k = 55 N/m hangs vertically next to a ruler. The end of the spring is next to the 18-cm mark on the ruler.

A spring with kk = 55 N/mN/m hangs vertically next to a ruler. The end of the spring is next to the 18-cmcm mark on the ruler. If a 3.0-kgkg mass is now attached to the end of the spring, and the... more

10/04/21

#### Can someone do this step by step please?

A cat chases a mouse across a 0.66 m high table. The mouse steps out of the way, and the cat slides off the table and strikes the floor 2.4 m from the edge of the table. The acceleration of gravity... more

10/03/21

#### You and a friend are doing a free fall demonstration where one of you drops a tennis ball from the top of a tall building while the other throws a second tennis ball from the same starting height

The first tennis ball was dropped from a height of 20.0 meters. Assume g=9.81m/s^2The second tennis ball was thrown down with an initial velocity of -4.00m/s from the same starting height of 20.0... more

10/02/21

#### A space probe is launched from Earth headed for deep space. At a distance of 10,000 miles from Earth's center, the gravitational force on it is 909 lb.

What is the size of the force when it is at each of the following distances from Earth's center? (a) 20,000 miles (b) 30,000 miles (c) 100,000 miles The answer will need to be in lbs. more

10/14/20

#### Problem Solving with Kinematics Equation 1

An object increases its velocity from 22 m/s to 36 m/s in 5 s. What is the acceleration of theobject?

09/10/20

#### a mass is hanging from a spring that is moving as v(t) = 8.8sin(8.3t). So the veloci

A mass is hanging from a spring that is moving as v(t) = 8.8sin(8.3t). So the velocity is at 0 m/s on a periodic basis. For example, when t = 0 s, the velocity is 0 m/s. What is the ACCELERATION of... more

08/29/20

#### Four identical metal spheres have charges of qA = -8.0 μC, qB=-2.0 μC, qC=+5.0 μC, and qD=+12.0 μC.

Four identical metal spheres have charges of qA = -8.0 μC, qB=-2.0 μC, qC=+5.0 μC, and qD=+12.0 μC.(a) Two of the spheres are brought together so they touch, and then they are separated. Which... more

08/09/20

#### Inclined plane physics problem

A sphere with mass m is put on top of an inclined plane with height h. In the first case the sphere is moving downwards without friction, and in the second case with very little friction. Find the... more

07/25/20

#### Tom at a beach sees an anchored fishing boat rise and fall 3.5 m once every 4.0 s as wave crests 25 m apart pass through

Tom at a beach sees an anchored fishing boat rise and fall 4.5 m once every 5.0 s as wave crests 25 m apart pass through it(a) Calculate the frequency of the waves. (b) Calculate the speed of... more

07/25/20

#### Monochromatic light has a wavelength of 2.85 × 10^7 m in air and 5.22 × 10^7 m in clear liquid. If the ray of such light enters a clear liquid pool at an angle of incidence of 30.0°..

Monochromatic light has a wavelength of 2.85 × 10^7 m in air and 5.22 × 10^7 m in clear liquid. If the ray of such light enters a clear liquid pool at an angle of incidence of 30.0°, what is the... more

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