Questions tagged 'Physics'
312 questions
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The supersonic aircraft Concorde has a length of 62.4 meters when sitting on the ground at a typical temperature of 15.0 °C. The Concorde is primarily constructed from aluminum. In flight, at twice th...
Find the magnitude of the velocity of the block just after impact.?
A rifle bullet with a mass of 8 grams strikes and embeds itself in a block with a mass of 0.992 kg. The block rests on a frictionless horizontal surface and is attached to a spring. The impact compres...
first law of thermodynamics?
An egg is initially at rest and is dropped onto a concrete surface, resulting in its breakage. Treating the egg as a system, please address the following: a. What is the sign of work (W)? b. What is t...
How far from the base of the building does the ball hit the ground?
A ball is thrown horizontally from the top of a building that is 13 meters high, with an initial speed of 5.0 m/s. I would like to know how far from the base of the building the ball will land on the...
Feb 19, 2025
physics – In the Bohr model, how many electron wavelengths fit around this orbit?
A hydrogen atom is in the n = 2 state. In the context of the Bohr model, how many wavelengths of the electron fit around this orbit?
Feb 19, 2025
How much heat is required to warm 1.70 kg of sand from 30.0 ∘C to 100.0 ∘C? The specific heat capacity of sand is Cs=0.84J/g⋅∘C.?
How much heat is required to raise the temperature of 1.70 kg of sand from 30.0 °C to 100.0 °C? The specific heat capacity of sand is given as Cs = 0.84 J/g·°C.
a 0.12 kg disk is shot across a frictionless horizontal surface by being compressed against a spring?
In an arcade game, a 0.12 kg disk is shot across a frictionless horizontal surface after being compressed against a spring. The spring has a spring constant of 200 N/m and is compressed 6.0 cm from it...
A mole of red photon of wavelength 725nm has how much KJ?
A mole of red photons with a wavelength of 725 nm has how much energy in kilojoules (kJ)? Here’s what I have done so far: I converted the wavelength from nanometers to meters: ( 725 \, \text{n...
Physics help! Got an answer, don’t know why it’s wrong?
The sledder shown in the figure starts at the top of a frictionless hill and slides down into a valley. What initial speed, (v_i), does the sledder need in order to just make it over the next hill? Th...
Rays from the sun are not considered matter true or false
Are rays from the sun considered matter? Please answer true or false.