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Physics

Guest

Two nuclei have mass number in the ratio of 2:5 what is the ratio of their number densities

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Physics

Gillespie

The specific heat of silver is 0.057 calories/gram°C. If 10.0 grams of silver were heated and the temperature of the sample changed by 20.0°C, how many calories of heat energy were absorbed by the sample?

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Physics

Tyson Huffman

A student conducts and investigation to determine a ball's mass, displacement, velocity and acceleration. (A) Identify each of the following as wither a vector or scalar quantity: Mass, Displacement, Velocity & Acceleration. (B) Describe how vector quantities are different from scalar quantities. (C) The ball starts from rest and is set in motion of 5 m/s. it rolls for 5 seconds before crossing the finish line. What is the acceleration?

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Physics

Justus Hawkins

Suppose you pour water into a container until it reaches a depth of 12 cm. Next, you carefully pour in an 8.5 cm thickness of olive oil so that it floats on top of the water.

What is the pressure at the bottom of the container?

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Physics

Britney Shea

We had a homework problem in which the Arrhenius equation was applied to the blinking of fireflies. Several other natural phenomena also obey that equation, including the temperature dependent chirping of crickets. A particular species, the snowy tree cricket, has been widely studied. These crickets chirp at a rate of 178 times per minute at 25.0°C, and the activation energy for the chirping process is 53.9 kJ/mol. What is the temperature if the crickets chirp at a rate of 126 times per minute?

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Physics

Halle Roberts

What factors created a climate favorable to reform in the early nineteenth century america?

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Physics

Bianca Pittman

Wha is the smallest particle of an element

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Physics

Guest

What is the pressure exerted by a boy

weighing 80kg on the ground when he stands

on his feet whose area is 200cm2?

A. 80 pa

B. 1600 pa

C. 40,000 pa

D. 400 pa

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Physics

Trevor Christensen

On a distant planet a freely falling object has an acceleration of 20m/s. what vertical distance will an object dropped from rest on this planet cover in 1.8

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Physics

Siena Craig

The sun's energy results from what?

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Physics

Kadence Horne

Suppose ocean waves are hitting a shore at a frequency of 20 waves per minute. Two swimmers are in the water. One swimmer says the frequency is 25 waves per minute and the other says the frequency is 15 waves per minute. How can the Doppler effect explain this apparent difference?

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Physics

Tobias Kidd

An alien has landed on the planet and asks you, "what is kinetic?" what would you tell them?

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Physics

Kayla Swanson

What is the momentum of a 0.2kg ball with a speed of 5 m/s

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Physics

Waylon Mathis

The illuminance on a surface is 3.5 lux, and the surface is 2 meters from the light source. What's the intensity of the source?

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Physics

Admiral

The initial position and velocity of a projectile are given by r₀ = 3i+4j and v₀ = 6i+8j respectively, and where r is in m and v in m/s. The position in the horizontal direction (in m) as a function of time is:

A. x (t) = 6t

B. x (t) = 4 + 8t

C. x (t) = 3 + 6t + The initial position and velocity of a projectile gt²

D. x (t) = 3 + 6t

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