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ratelena [41]
3 years ago
13

At room temperature ice will melt while a brass lamp will stay as a solid. This must mean that the melting point of water is ___

____ brass's melting point.
A) lower than
B) higher than
C) the same as
Physics
2 answers:
Vesna [10]3 years ago
8 0

Answer:

Correct answer is option A (Lower than)

Explanation:

Melting point:

Melting point is the temperature at which a solid start melting.

If a solid start meting at low temperature than it is said it has low melting point and if a solid does not melt even at very high temperature than it is said that it has high melting point

At room temperature ice will melt while a brass lamp will stay solid this must mean that the melting point of water is lower than brass's melting point.

UkoKoshka [18]3 years ago
4 0
If solid, cold metal like brass doesn't melt at room temperature like ice does, than the bass can stand much more heat then a ice cube, so it needs to be hotter to melt, so the melting point of ice is lower then brass's melting point
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A cell has an internal resistance of 0.02ohms and e.m.f of 2.0v calculate it's terminal p.d if it's delivers (a)5A ( b)50A​
Aleksandr-060686 [28]

Answer:

(a) The terminal voltage of the cell is <u>1.9 V.</u>

(b) The terminal voltage of the cell is <u>1.0 V.</u>

Explanation:

Given:

(a)

E.M.F of the cell (E) = 2.0 V

Internal resistance of the cell (r) = 0.02 ohms

Current passing through the cell (I) = 5 A

Now, the potential difference across the terminals of the cell is given as:

V=E-Ir

Plug in the given values and solve for 'V'. This gives,

V=2.0-(5\times 0.02)\\\\V=2.0-0.1=1.9\ V

Therefore, the terminal voltage of the cell is 1.9 V.

(b)

E.M.F of the cell (E) = 2.0 V

Internal resistance of the cell (r) = 0.02 ohms

Current passing through the cell (I) = 50 A

Now, the potential difference across the terminals of the cell is given as:

V=E-Ir

Plug in the given values and solve for 'V'. This gives,

V=2.0-(50\times 0.02)\\\\V=2.0-1.0=1.0\ V

Therefore, the terminal voltage of the cell is 1.0 V.

4 0
3 years ago
If the impulse acting on an object is 100n waht is force acting on it if the time 1 s
lutik1710 [3]

force = 100 N

  • Impulse ( N.s ) : Force ( N ) * Time ( s )

⇒ 100 N.s = force * 1 s

⇒ force = 100/1

⇒ force = 100 N

8 0
3 years ago
Tyler has learned that potential energy is energy stored. Tyler's teacher asks the students to come up with a demonstration of p
Advocard [28]
D.A child at the top of a slide
7 0
4 years ago
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Earth's atmosphere contains only small amounts of carbon dioxide because
Mamont248 [21]
Of biogeochemical cycles

Because certain biogeochemical cycles take place to lessen these gases from forming since they are not beneficial for life if too much.
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4 0
3 years ago
Red light of wavelength 651 nm produces photoelectrons from a certain photoemissive material. Green light of wavelength 521 nm p
Mnenie [13.5K]

Answer:

material work function is 0.956 eV

Explanation:

given data

red wavelength 651 nm

green wavelength 521 nm

photo electrons = 1.50 × maximum kinetic energy

to find out

material work function

solution

we know by Einstein photo electric equation  that is

for red light

h ( c / λr ) = Ф +  kinetic energy

for green light

h ( c / λg ) = Ф +  1.50 × kinetic energy

now from both equation put kinetic energy from red to green

h ( c / λg ) = Ф +  1.50 × (h ( c / λr ) - Ф)

Ф =( hc / 0.50) × ( 1.50/ λr  - 1/ λg)

put all value

Ф =( 6.63 ×10^{-34} (3 ×10^{8} )  / 0.50) × ( 1.50/ λr  - 1/ λg)

Ф =( 6.63 ×10^{-34} (3 ×10^{8} ) / 0.50 ) × ( 1.50/ 651×10^{-9}   - 1/ 521 ×10^{-9})

Ф = 1.5305  ×10^{-19} J  × ( 1ev / 1.6 ×10^{-19} J )

Ф = 0.956 eV

material work function is 0.956 eV

4 0
3 years ago
Read 2 more answers
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