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3 years ago

A 5 kg block of copper (specific heat capacity = 385 J/kg°C) at 20°C is given

Physics

1 answer:

monitta3 years ago

6 0

Answer:

$44^{\circ}C$

Explanation:

When heat energy is supplied to a substance, its temperature increases according to the equation:

$Q=mC\Delta T$

where

Q is the energy supplied

m is the mass of the substance

C is the specific heat capacity

$\Delta T$ is the increase in temperature

For the block of copper in this problem:

m = 5 kg

C = 385 J/kg°C

Q = 46,200 J

Therefore, the increase in temperature is

$\Delta T=\frac{Q}{mC}=\frac{46,200}{(5)(385)}=24^{\circ}C$

And since the initial temperature is 20°C, the final temperature will be

$T_f=20^{\circ}C+\Delta T=44^{\circ}C$

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Captain John Stapp is often referred to as the "fastest man on Earth." In the late 1940s and early 1950s, Stapp ran the U.S. Air

valentina_108 [34]

Answer:

The sled needed a distance of 92.22 m and a time of 1.40 s to stop.

Explanation:

The relationship between velocities and time is described by this equation: $v_f=v_0+a*t$ , where $v_f$ is the final velocity, $v_0$ is the initial velocity, $a$ the acceleration, and $t$ is the time during such acceleration is applied.

Solving the equation for the time, and applying to the case: $t=\frac{v_f-v_0}{a}=\frac{0\frac{m}{s}-282\frac{m}{s} }{-201\frac{m}{s^2} }=1.40s$ , where $v_f=0\frac{m}{s}$ because the sled is totally stopped, $v_0=282\frac{m}{s}$ is the velocity of the sled before braking and, $a=-201\frac{m}{s^2}$ is negative because the deceleration applied by the brakes.

In the other hand, the equation that describes the distance in term of velocities and acceleration: $x_f-x_0=v_0*t+\frac{1}{2}*a*t^2$ , where $x_f-x_0$ is the distance traveled, $v_0$ is the initial velocity, $t$ the time of the process and, $a$ is the acceleration of the process.

Then for this case the relationship becomes: $x_f-x_0=282\frac{m}{s} *1.40s+\frac{1}{2}(-201\frac{m}{s})*(1.40s)^2=94.22m$ .

Note that the acceleration is negative because is a braking process.

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3 years ago

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A homeowner wants to reduce the environmental damage of the energy source used to heat her home.

liberstina [14]

Answer:

wind

Explanation:

wind is the only one of those onto that list that is a renewable source

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A wood block, after being given a starting push, slides down a ramp at a constant speed. what is the angle of the ramp above hor

Stells [14]

The solution for the problem is:

Constant speed means Fnet = 0.
Let m = mass of wood block and Θ = angle of ramp; then if µk = 0.35 …

The computation would be:

Fnet = 0 = mg (sin Θ) - (µk) (mg) (cos Θ)
mg (sin Θ) = µk (mg) (cos Θ)
µk = tan Θ
Θ = arctan(µk)

= arctan (0.35)

≈ 19.3°

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3 years ago

Jared is reading an article about the heavy rains that have fallen recently in his town. But he can’t separate the facts from th

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FACTS:
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It’s that time of year again when the days are wet and cool.
 The rainy season is the best season.
Rain makes up part of Earth’s water cycle.
Water evaporates from streams, lakes, and oceans, then condensation
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 Precipitation in the form of rain is better than snow.
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Rain is a great boon to local farmers.
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OPINIONS:
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| It’s that time of year again when the days are wet and cool.
The rainy season is the best season.
 Rain makes up part of Earth’s water cycle.
 Water evaporates from streams, lakes, and oceans, then condensation
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Precipitation in the form of rain is better than snow.
Snow this time of year makes people gloomy.
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 It helps their crops grow.

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3 years ago

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saul85 [17]

Answer:

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Explanation:

i hope this will help you :)

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3 years ago