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Physics

Rocco Olsen

You throw a 5.5 g coin straight down at 4.0 m/s from a 25-m-high bridge.

A) How much work does gravity do as the coin falls to the water below?

B) What is the speed of the coin just as it hits the water?

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Physics

Proctor

While a kettle boils, 0.018kg of water changes to steam

Calculate the amount of energy required for this change

Specific latent heat of vaporisation of water = 2.3 x 10000000J/kg

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Physics

Trace Hoffman

The parking brake on a 1000 kg Cadillac has failed, and it is rolling slowly, at 1 mph, toward a group of small children. Seeing the situation, you realize you have just enough time to drive your 2000 kg Volkswagen head-on into the Cadillac and save the children.

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Physics

Whitney Vincent

Why are metals are good conductors of heat?

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Physics

Harper Hayes

A thin electrical heater is fitted between two long, concentric cylinders with inner and outer radii of 20 mm and 40 mm. The inner solid cylinder (A) has a thermal conductivity kA = 0.15 W/m-K. The outer cylinder (B) has a thermal conductivity kB = 1.5 W/m-K and its surface is subjected to convection with a fluid temperature T = - 15o C and a heat transfer coefficient of 50 W/m2 - K.

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Physics

Gabriel Noble

Why does the modern atomic theory today represent the best explanation scientists have to offer?

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Physics

Sergio

Light travels at a constant speed of 3.0*108 m/s in a vacuum. (a) It takes light about 1.3 seconds to travel from the Earth to the Moon. Estimate the distance of the Moon from the Earth's surface, in meters. (b) The astronomical unit (abbreviated AU) is equal to the distance between the Earth and the Sun. One AU is about 1.5*1011 m. If the Sun suddenly ceased to emit light, how many minutes would elapse until the Earth went dark?

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Physics

Jazlene Bailey

A car travels 1000m North and 2000m South. The total journey time is 300s. Calculate the distance traveled

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Physics

Braiden Buck

Which elements on the periodic table have the lowest electronegativity?

A. Elements on the bottom left

B. Elements on the bottom right

C. Elements on the top right

D. Elements on the top left

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Physics

Shawn

An astronaut has become detached from her spaceship. She's floating in space holding a wrench. She's 50 m from her current location. How does she get back to the spaceship?

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Physics

Dalia Hawkins

Which of these types of organisms is there more of on Earth? A. goat B. human C. dandelion D. bacterium

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Physics

Carolyn

A twig from a tree drops from a 200m high cliff on to a beach below. during its fall 40% twig's energy is converted into thermal energy. what is the speed with which the twig hits the beach?

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Physics

Atticus Merritt

As material from the outer envelope of the larger star builds up on the surface of the white dwarf, its temperature and density increase continuously. Under this scenario, what is the first event that will eventually happen?

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Physics

Danielle Chandler

How do you find the mass number in an atom?

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Physics

John Snow

If (on earth) an object falls 18m and loses 36J of GPE. What is the objects mass?

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