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3 years ago

How much heat is required to raise the temperature of 45.5 g of water from its melting point to its boiling point?

1 answer:

3 0

First, melt the ice, H2O(s):

45.5gH2O x 333J/1gH2O = 15,152 J 

Next, raise the temperature of the water, H2O(l): 

45.5gH2O x 100degC x 4.184J/1gH2O-1degC = 19,037 J 

Finally, addem all up: 

34,200 J = 34.2 kJ to three significant figures

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Consider a one-dimensional crystal (similar to a carbon nanowire) with length 10 um and lattice spacing 0.1 nm.

Finger [1]

Answer:

a) Fermi level = 600 electron-volts

b) $\frac{2.04 * 10^{13} }{\sqrt{E} }$

Explanation:

Given data:

length of one-dimensional crystal = 10 um

Lattice spacing = 0.1 nm

A) Determine the Fermi level assuming one electron per atom

Total length = 10 um

Interatomic separation of a = 0.1 nm

in this case the Atom has one electron therefore the number of electrons = 10^5 and the number of states Ns = gsN = 2 * 10^5 ( attached below is some part of the solution )

hence : Fermi level = 600 electron-volts

B) Determine the density of states as a function of electron energy

attached below is the detailed solution

5 0

3 years ago

A 15-kg block at rest on a horizontal frictionless surface is attached to a very light ideal spring of force constant 450 N/m. T

den301095 [7]

Answer:

0.266 m

Explanation:

Assuming the lump of patty is 3 Kg then applying the principal of conservation of linear momentum,

P= mv where p is momentum, m is mass and v is the speed of an object. In this case

$m_pv_p=v_c(m_p+m_b)$ where sunscripts p and b represent putty and block respectively, c is common velocity.

Substituting the given values then

3*8=v(15+3)

V=24/18=1.33 m/s

The resultant kinetic energy is transferred to spring hence we apply the law of conservation of energy

$0.5(m_p+m_b)v_c^{2}=0.5kx^{2}$ where k is spring constant and x is the compression of spring. Substituting the given values then

$(3+15)*1.33^{2}=450*x^{2}\\x\approx 0.266 m$

7 0

3 years ago

What does a Battery and a human have in common?

Elena L [17]

Both are objects and contain matter and mass. both are made of atoms, and produce reactions.

8 0

3 years ago

The law of conservation of energy states that (4 points)

slava [35]

Answer:

energy cannot be created or destroyed

Explanation:

Energy can't be created nor destroyed; rather, it transforms from one form to another.

8 0

3 years ago

How many boxes of potatoes does the Mayflower need if each person gets 3 potatoes a day?

Furkat [3]

Using the appropriate arithmetic operation, the amount of potatoes and cabbage require for the voyage are 19998 and 26664 respectively.

Number of men = 47
Number of women = 32
Number of children = 22
Number of voyage days

Total number of passengers = (47 + 32 + 22) = 101

1.)

If each person gets 3 potatoes per day :

Number of potatoes needed per day = (3×101) = 303

Number of potatoes needed for entire voyage = (303 × 66) = 19998 potatoes.

2.)

If each person gets 4 cabbage per day :

Number of cabbage needed per day = (4×101) = 404

Number of cabbage needed for entire voyage = (404 × 66) = 26664 cabbages.

Hence, the number of cabbage needed for the voyage would be 26664 cabbages.

Learn more : brainly.com/question/25651592

4 0

3 years ago