4 years ago

How much heat is needed to melt 16.5kg of silver that is initially at 20*c?

1 answer:

8 0

The Specific Heat Capacity of silver is 230 J/kgK, melting point is 961.8 C so the difference is 941.8K. Now we simply do q=230J/kgK*16.5kg*941.8K and that is 3 574 131 J

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Which statement about coal is true? When burned, coal produces pollutants that are released into the air. Coal will always stay

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2, coal is a renewable resource

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3 years ago

Destiny is eating lunch at her favorite cafe when her friend Jada calls and says she wants to meet her. Jada is calling from a c

NeTakaya

Answer:

Explanation:

Let time taken by Jada in driving be t hour .

distance travelled by jada = 55 t

a )

Time of drive by destiny = t - 10 min

= t - .167 hour

distance of travel by destiny = 70 ( t - .167 )

Total distance = 45 miles

55 t + 70 ( t - .167 ) = 45

55t + 70 t - 11.69 = 45

125 t = 56.69

t = .453 hour = 27.21 minutes

b )

distance travelled by Destiny = 70 ( t - .167 )

70 ( .453 - .167 )

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3 years ago

What is the force of gravity between Earth (mass = 6.0 × 1024 kilograms) and Jupiter (mass = 1.901 × 1027 kilograms)? The distan

svlad2 [7]

Answer:

1.352 × 1018 newtons

Explanation:

The force of gravity between the two planets is given by:

$F=G\frac{m_1 m_2}{r^2}$

where

$G=6.67\cdot 10^{-11} Nm^2 kg^{-2}$ is the gravitational constant

$m_1 = 6.0\cdot 10^{24} kg$ is the mass of the Earth

$m_2 = 1.901 \cdot 10^{27} kg$ is the mass of Jupiter

$r=7.5\cdot 10^{11} m$ is the distance between the two planets

Substituting all the numbers into the equation, we find:

$F=(6.67\cdot 10^{-11}) \frac{(6.0\cdot 10^{24})(1.901\cdot 10^{27})}{(7.5\cdot 10^{11})^2}=1.352\cdot 10^{18} N$

6 0

3 years ago

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Wave A has an amplitude of 3, and wave B has an amplitude of 3. What will happen when the trough of wave A meets the trough of w

allsm [11]

The answer is: They will interfere to create a trough with an amplitude of 6.

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3 years ago

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a kid uses a slingshot to shoot a rock at a target. when the kid applies a net force of 8.68 N forward, the rock accelerates at

Feliz [49]

Answer:

0.7kg

Explanation:

Given parameters:

Force on the rock = 8.68N

Acceleration = 12.4m/s²

Unknown:

Mass of the rock = ?

Solution:

From newton's second law of motion, the net force on a body is the product of mass and acceleration

Net force = mass x acceleration

Now insert the parameters and solve the problem;

8.68 = mass x 12.4

mass = $\frac{8.68}{12.4}$ = 0.7kg

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3 years ago