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3 years ago

You are riding in a train that is traveling at a speed of 120km /h how long will it take to travel 950 km

Physics

1 answer:

nikdorinn [45]3 years ago

4 0

You divide 120 from 950 and that's the number of hours, 7.9

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A car acquires a velocity of 72km/h in 10sec starting from rest .find it's

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Distance travelled.

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4 years ago

. Are there human health risks from exposure (or overexposure) to X-rays? If so:

algol [13]

<h3>yes, there are human health risks caused by exposure to x rays</h3>

describe the main risk (s) ::: - may cause damage to cells in the body

- large doses may lead cells to be cancerous

- causes mutations in the DNA

describe common sources of exposure ( or overexposure ) :::

- natural background radiation e.g. - cosmic rays

- medical radiation e.g. - CT scans & medical x - rays

- man - made radiation e.g. - airport security scanners

describe a technology, device, or behavior that can be used for protection, or to decrease exposure :::

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<em>hope that helps !!</em>

3 0

3 years ago

Read 2 more answers

What mass of ice (in g) can be melted if 27.2 kJ of thermal energy are added at the freezing point? Use molar mass = 18.02 g/mol

san4es73 [151]

Answer : The mass of ice melted can be, 3.98 grams.

Explanation :

First we have to calculate the moles of ice.

$Q=\frac{\Delta H}{n}$

where,

Q = energy absorbed = 27.2 kJ

$\Delta H$ = enthalpy of fusion of ice = 6.01 kJ/mol

n = moles = ?

Now put all the given values in the above expression, we get:

$27.2kJ=\frac{6.01kJ/mol}{n}$

$n=0.221mol$

Now we have to calculate the mass of ice.

$\text{Mass of ice}=\text{Moles of ice}\times \text{Molar mass of ice}$

Molar mass of ice = 18.02 g/mol

$\text{Mass of ice}=0.221mol\times 18.02g/mol=3.98g$

Thus, the mass of ice melted can be, 3.98 grams.

3 0

4 years ago

Which two phases of the water cycle are repeated in this process? A. evaporation and precipitation B. evaporation and condensati

Katarina [22]

It Is A Evaporation And Precipitation

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3 years ago

You're driving down the highway late one night at 20 m/s when a deer steps onto the road 35 m in front of you. You reaction time

bearhunter [10]

Answer:

Explanation:

Discount the time here; it's not important. It doesn't tell you how long it takes the car to stop, it only refers to reaction time, which means nothing in the scheme of things.

The useful info is as follows:

initial velocity = 20 m/s

final velocity = 0 m/s

a = -10 m/s/s

and we are looking for the displacement. Use the following equation:

$v^2=v_0^2+2a$ Δx

where v is the final velocity, v₀ is the initial velocity, a is the deceleration (since it's negative), and Δx is displacement. Filling in:

$0^2=(20)^2+2(-10)$ Δx and

0 = 400 - 20Δx and

-400 = -20Δx so

Δ = 20 meters

3 0

3 years ago