12,723 Answered Questions for the topic physics

04/15/24

Doppler-effect problem
Please help.I found this interesting problem on the internet, but I don't know how to start it:These are the questions:At what frequency do astronauts hear the hum?What frequency should the radio... more
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Physics

04/13/24

A block mass 12.2 kg sitting on ramp that makes angle 24 degrees with the horizontal. The block is being pushed by horizontal force 214N. The coefficient kinetic friction between the two surfaces 0.46
Find the acceleration of the block up the ramp in m/s^2
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Physics

04/12/24

I need help finding the velocity of a 21.6 g marble after it collides. The scenario is as follows:

21.6 g marble sliding to the right at 54.8 cm/s overtakes and collides elastically with a 10.8 g marble moving in the same direction at 13.7 cm/s. After the collision, the 10.8 g marble moves to... more
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Physics Algebra 1

04/12/24

Standard Deviation
Suppose you counted the number of people in line each time you came to your favourite coffee shop last month. Here are the results of your investigation. What is the error determined bt the 2/3... more
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Physics

04/11/24

Physics Transformer relationships

The primary of a transformer connected to 150 VV has 100 turns. The secondary has 10 turns. Find the output voltage. This is a step-down transformer.
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Physics

04/11/24

Physics force between two objects

Two point charges are separated by 3.4 cm . The attractive force between them is 22 N. Find the force between them when they are separated by 8.8 cm .
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Physics

04/11/24

Physicis Change in heat temp
The specific heat capacity of steel is 450 J/kg⋅∘CJ/kg⋅∘C. Find the amount of heat that is needed to raise the temperature of a 13-kgkg piece of steel from 0 ∘C to 130 ∘C.How does this compare with... more
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Physics

04/11/24

Physics Change in Temp

Use the formula to find how many cal it takes to raise the temperature of 200 g of water from 20∘C∘C to 25 ∘C∘C. For the specific heat capacity c, use 1 cal/g⋅∘Ccal/g⋅∘C. Q=cmΔT
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Physics

04/11/24

Physics Force and pressure

Suppose you balance a 2.8-kgkg ball on the tip of your finger, which has an area of 1.0 cm2cm2 . What is the pressure on your finger?
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Physics

04/11/24

Physics Force of Gravity

Calculate the force of gravity on the 1.5-kgkg mass if it were 6.4×106 mm above Earth's surface (that is, if it were two Earth radii from Earth's center)
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Physics

04/11/24

Physics Force on a object

An ostrich egg of mass m is tossed at a speed v into a sagging bed sheet and is brought to rest in a time t. Find the force acting on the egg when it hits the sheet. Express your answers in m, v... more
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Physics

04/11/24

Phyisics Net Force

A rocket of mass 70000 kg undergoes an acceleration of 2.2 m/s2m/s2. Find the net force acting on it. I am not sure how to set up this problem or if I got the right answer.
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Physics

04/11/24

Can you clear this misconception of mine?
In Doppler Effect, I have a misconception regarding one thing which I have explained below:In the Doppler Effect, the wavelength of the waves travelling in the same direction of the source... more
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Physics

04/10/24

A car traels at 61.4 km/h on a level road in the positive direction of an x axis. Each tire has a diameter of 65.2 cm. Relative to a woman riding in the car an in unit vector notation.

What are the velocity at the a. centerb. topc. bottom of the tire and the magnitude a of the acceleration at the d. center e. top and f. bottom of each tire? Relative to a hitchhiker sitting next... more
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Physics

04/10/24

A moving object has a kinetic energy of 109 J and a momentum with magnitude of 40.0 kg·m/s. What is the mass and speed of the object?
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Physics

04/10/24

A moving object has a kinetic energy of 109 J and a momentum with magnitude of 40.0 kg·m/s. What is the mass and speed of the object?
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Physics

04/10/24

An ultracentrifuge accelerates from rest to 100,000 rpm in 1.30 min. What is the radial acceleration, in m/s^2, of a point 11.55 cm from the axis of rotation at full rpm?
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Physics

04/10/24

With the aid of a string, a gyroscope is accelerated from rest to 30 rad/s in 0.8 s. How many revolutions does it go through in the process?
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Physics

04/10/24

At its peak, a tornado is 46.0 m in diameter and carries 315-km/h winds. What is its angular velocity in revolutions per second?
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Physics

04/06/24

Physics 20: Gravitational Field Strength 'g'
At what height above Earth in kilometers is the gravitational field strength 90.0% of what it is on Earth's surface?
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Physics

04/05/24

A 26.6 kg box is initially kicked so that it slides up a ramp inclined at 29 degrees above the horizontal. The coefficient of kinetic friction between the box and the ramp is 0.31.
Find the magnitude of the acceleration of the box, in m/s^2.
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Physics

04/05/24

The body in the figure

The body in the figure is pivoted at O, and two forces act on it as shown. If r1=2.87 m, r2=3.61 m, F1 = 3.26 N, F2 =4.87 N Theta 1 = 60.0 degrees and Theta 2 = 54.0 degrees. what is the net torque... more
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Physics

04/05/24

In the figure two particles

In the figure, two particles, each with mass m=0.88 kg, are fastened to each other and to a rotational axis at O, by two thin rods, each with length d= 5.5 cm and mass M=101 kg. The combination... more
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Physics

04/05/24

Calculate the rotational inertia of a meter stick

Mass of the meterstick is 0.749 kg, about an axis perpendicular to the stick and located at the 42.1 cm mark Calculate the rotational inertia of the meterstick
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Physics

04/05/24

Solving for angular velocity

A 85.1 kg horizontal circular platform rotates freely with no friction about its center at an initial angular velocity of 1.55 rad/s. A monkey drops a 8.95 kg bunch of bananas vertically onto the... more
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