12,725 Answered Questions for the topic physics

07/25/22

Projectile motion problem
An object is thrown with an initial velocity v0 = 21 m/s and an angle α = 60° with the horizon. At what height will its velocity make β = 30° angle with the horizon?
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07/25/22

Interesting physics problem about escalator
A physics student decided to investigate the escalator. By the time he went down the escalator for the first time, he counted n1 = 50 steps. The second time, moving down at three times the speed,... more
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07/25/22

Find the resistance between point A and B
a) A figure made of wire consists of two equilateral triangles of triangles as shown in fig. a). The length of the side of the larger triangle is a, the longitudinal resistance of the wire is ρ.... more
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Physics

07/25/22

A person stands directly in front of two speakers that are emitting the same pure tone.

The person then moves to one side until no sound is heard. At that point, the person is 4.90 m from one of the speakers and 4.93 m from the other. What is the frequency (in Hz) of the tone being... more
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Physics Math

07/25/22

kWh required to heat my swimming pool

I am building a swimming pool 9 metres by 3 metres by 2 metres deep . I want to heat it with solar panels feeding electricity to a heat pump . I need to know how many kWh of electricity I need to... more
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Physics Math

07/24/22

Find the Resultant and Equilibrant Forces of the given vectors below
A = 500 N to the EastB= 450 N to the SouthC = 400 N to the WestD= 550 N to the NorthE= 400 N 45° South of West
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Physics

07/23/22

An iceberg has a density of 0.920 g/cm^3.
Saltwater has a density of 1.025 g/cm^3. When an iceberg floats in the ocean, what percentage of the volume of the iceberg is above water, and what percentage is below water?
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Physics

07/23/22

A 64.5 g bullet is fired from a rifle having a barrel 0.935 m long.
A 64.5 g bullet is fired from a rifle having a barrel 0.935 m long. Assuming the origin is placed where the bullet begins to move, the force exerted on the bullet by the expanding gas is F = a + b... more
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Physics

07/21/22

I tried this question, and arrived at 2.2*10^3, using the formula for potential energy (question below). Is there another answer that is better?
A 15-kg load of groceries is lifted up from the ground to the fifth floor of an apartment building. Each floor is 5.00 m high. The potential energy of the groceries with respect to the second... more
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07/20/22

Mechanics problem about lifting an object
While lifting a regular uniform rectangular plate with side dimensions a and b, one of the three workers holds it at one of the four courners. At which points must the other two workers hold the... more
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07/20/22

Physics problem about two different liquids
There are two immiscible layers of different liquids in a bowl, the densities and the thicknesses are ρ1, ρ2, h1, h2, respectively. Then, a small ball is placed to sink from the surface of the... more
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Physics Act Science

07/20/22

A liquid of density ρ is in a container with bottom area S. How much will the level of that liquid rise in the container if we throw a non-sinking object of mass m into the container?
A liquid of density ρ is in a container with bottom area S. How much will the level of that liquid rise in the container if we throw a non-sinking object of mass m into the container?
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Physics Act Science

07/20/22

Physics question about gas pressure
We have a closed frustoconical container filled with compressed gas. Are the forces that the gas is exerting equally pressing the flat sides of the container (bottom and top)? If not, then why does... more
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Physics Act Science

07/20/22

A ball and a cube of equal mass lie on the floor. Both bodies are lifted up to the ceiling. In which case more work is done?
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Physics

07/20/22

physics question 13
A small block has constant acceleration as it slides down a frictionless incline. The block is released from rest at the top of the incline, and its speed after it has traveled 6.80 mm to the... more
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Physics

07/20/22

physics question 16b
A rocket starts from rest and moves upward from the surface of the earth. For the first 10.0 ss of its motion, the vertical acceleration of the rocket is given... more
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Physics

07/20/22

phys 16 qestion
A rocket starts from rest and moves upward from the surface of the earth. For the first 10.0 ss of its motion, the vertical acceleration of the rocket is given... more
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Physics

07/20/22

physics question 2
A juggler throws a bowling pin straight up with an initial speed of 8.40 m/sm/s.For related problem-solving tips and strategies, you may want to view a Video Tutor Solution of Up-and-down motion in... more
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Physics

07/20/22

physics question
A small block has constant acceleration as it slides down a frictionless incline. The block is released from rest at the top of the incline, and its speed after it has traveled 6.80 mm to the... more
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Physics

07/20/22

car that weighs 1200kg travels at 17 m/s and quickly stops. the car slides. coefficient of friction is 0.89. what is the distance the car slid?
doing a physics question due tonight and im stuck... please help
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Physics

07/18/22

What is the resistance 𝑅R of a 47.1-47.1-m-long aluminum wire that has a diameter of 8.45 mm?8.45 mm
What is the resistance 𝑅R of a 47.1-47.1-m-long aluminum wire that has a diameter of 8.45 mm?8.45 mm? The resistivity of aluminum is 2.83×10−8 Ω·m.
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Physics

07/18/22

Hydrostatic pressure of pool water
Indoor Pool / 175,000 gallonsWhat is the pressure of the water (psi) when the drain opens to allow it to empty ?
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Physics

07/18/22

quantum electrodynamics
When In quantum electrodynamics when using a stopwatch to “time” the movement of a photon to find the direction of its arrow representing the probability amplitude, why does the stopwatch have to... more
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Physics Chemistry

07/18/22

What is positive charge?
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Physics

07/17/22

An aluminum wing on a passenger jet is 37 m long when its temperature is 23°C. At what temperature would the wing be 7 cm (0.07 m) shorter?
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