12/05/22

Gravitational Potential Energy
Amber throws a .25 kg ball straight up with a speed of 13m/s. How do I find out how high the ball goes? How do I use the speed given to find the energy so I can find the height? Right now I only... more
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09/04/22

Physics Question
Dear experts, Im having trouble answering the following question:If the potential difference across an ohmic conductor is halved, the dissipated power:1) increases by a factor of 42) decreases by a... more
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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

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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07/18/22

What is positive charge?
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07/10/22

Find the​ half-life of a radioactive​ element, which decays according to the function ​A(t)​, where t is the time in years.
Find the​ half-life of a radioactive​ element, which decays according to the function ​A(t)=A0e−0.0189t​, where t is the time in years.
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07/09/22

hw help needed !
I drop a ball off a three-story balcony. We know that objects in freefall follow the equation for height h, in meters, h=−4.9t2+ch=-4.9t2+c, where t is time in seconds, and c is the initial... more
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07/06/22

Physics question

A point moves with simple harmonic motion whose period is 4 s. If it starts from restat a distance 4.0 cm from the centre of its path, find the time that elapses before it hasdescribed 2 cm and... more
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07/05/22

What are the required assumptions/conditions that need to be met in order to apply Bernoulli's equation to a fluid?
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06/27/22

Physics doubt -
In a concave mirror, when an object is placed between C and F, the image formed is real, inverted and magnified. But to find magnification, we need to divide the image height(-) with the object... more
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06/24/22

What is the basic difference between a cloud and fog?
What is the basic difference between a cloud and fog? A. Fog is a cloud near the ground. B. Clouds form when air is cooled, whereas fog forms when air is heated. C. Clouds form when air is heated,... more
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06/23/22

Glass has an index refraction of 1.52. A ray of light is shone from air into glass so that the angle of incidence is 18.0 degrees. Calculate the angle of refraction.
Glass has an index refraction of 1.52. A ray of light is shone from air into glass so that the angle of incidence is 18.0 degrees. Calculate the angle of refraction.Please include a detailed and... more
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06/23/22

A tuning fork (380 Hz) is held over an open air column. Determine the following...
A tuning fork (380 Hz) is held over an open-air column. Resonance first occurs (first harmonic) when the column is 44.0 cm long. What is the speed of the sound in the air at this time?Please... more
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06/23/22

Sirius is the brightest star in the night sky. It has a radius of 2.5 x 10^9 m and a mass of 5.0 x 10^31 kg. Determine the following...
Sirius is the brightest star in the night sky. It has a radius of 2.5 x 10^9 m and a mass of 5.0 x 10^31 kg. What is the gravitational force on a 1.0 kg mass as its surface?Please include a... more
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06/22/22

Help with this problem
45 liters of an ideal gas were under a pressure of 5 newtons per square meter. When 15 liters were added and the pressure increased to 10 newtons per square meter, the temperature became 900... more
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06/22/22

PLS HELP ME FAST SOMEONE
The speed of a light wave c is related to its wavelength λ and its frequency f by C=λf. If the speed of light is 3 × 10^8 meters/second and the wavelength of an infrared wave used in a remote... more
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06/21/22

how do i do this word problem?
The function d(t)=8t^2 +16, models the distance in km that a motorcycle travels in t hours.Determine the motorcycle’s average speed from a time of 2 hours to a time of 4 hours andcompare that to... more
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06/20/22

A truck with 48-in.-diameter wheels is traveling at 45 mi/h.

(a) Find the angular speed of the wheels in rad/min.(b) How many revolutions per minute do the wheels make?
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06/20/22

The wheels of a car have radius 13 in. and are rotating at 800 rpm. Find the speed of the car in mi/h.
I have tried entering in 62, 61.8, and 61.9 as answers but all were wrong.
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06/15/22

What is the defining law that helps Maxwell to solve the missing link between the existence of electricity and magnetism in space?
What is the defining law that helps Maxwell to solve the missing link between the existence of electricity and magnetism in space?
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06/14/22

Please help me with physics hw i dont understand

1) which of the following gives good evidence for the particle nature of EM radiation?A) photoelectric effectB) electron probability regionsC) interference patternsD) diffraction2) which of the... more
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06/12/22

Physics question about AC generator
The AC generator rotation frequency is 16.5 Hz. The generator generates 50 Hz alternating current. How many pairs of magnetic poles this generator has?The correct answer is 3 pairs.
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06/12/22

An apartment has the dimensions 17 m by 9 m by 6 m. The temperature is 30°C, and the relative humidity is 55 percent. What is the total mass (in kg) of water vapor in the air in the apartment?

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06/10/22

Electric Circuits
1. Which of the following statements are true? (Select all applicable)a. High conductivity of a wire means that it is more capable for handling currentsb. High resistivity of a wire means that it... more
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06/04/22

How to find the angle and resultant force of three forces for a particle in equilibrium?
A particle in equilibrium has three forces of magnitudes 5N, 6N and F N acting in it in the horizontal plane in the directions ( sorry it looks like I can’t attach a pic but the 5N is acting... more
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