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Physics

Joslyn Kirby

Read the following paragraph from the section "No Time To Get To Safety."

Many of the victims did not have enough time to climb on top of their roofs, or run to higher ground. There was little drinking water and no power, which forced authorities to suspend the search and rescue effort during the night.

Which idea is BEST supported by this paragraph?

A

Because people could not climb to their roofs, they had no access to drinking water.

B

Because the floods struck without warning, there was little time to make preparations.

C

Because authorities had to suspend the search, many people spent the night on their roofs.

D

Because Colombia has seen frequent flooding, many people have made evacuation plans.

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Physics

Carlie Arellano

What do we mean when we say the universe is expanding, and how does expansion lead to the idea of the big bang and our current estimate of the age of the universe?

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Physics

Jazmin Harrison

What is the gravity on the moon

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Physics

Adrien Meadows

Degausser creates a magnetic field that erases data from magnetic storage media.

a. True

b. False

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Physics

Gummy Pop

Which ever changes during a physical change?

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Physics

Carlson

Calculate the acceleration if you push with a 20 n horizontal force on a 4 kg block on a horizontal friction-free air table.

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Physics

Lilliana Massey

A horizontal force of 30 n pulls a block of mass 2.5 kg across a level floor. the coefficient of kinetic friction between the block and the floor is μk = 0.25. if the block begins with a speed of 7.0 m/s and is pulled for a distance of 14 m, what is the final speed of the block?

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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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