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3 years ago

Does specific heat of a substance depend on its temperature?

Physics

1 answer:

lara [203]3 years ago

4 0

Answer:

temperature

Explanation:

In general, the specific heat also depends on the temperature. The table below lists representative values of specific heat for various substances. Except for gases, the temperature and volume dependence of the specific heat of most substances is weak.

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How much time does it take for a car with a speed of 85 m/s to drive a distance of 200 m? (1 point)

Karolina [17]

Answer: 2.35 seconds rounded

Explanation:

the number unrounded us 2.352941176

7 0

4 years ago

When the drivers pass each other, the driver of the red car is to toss a package of contraband to the other driver. To catch the

Brrunno [24]

Answer:

D=387.28m

Explanation:

At the moment where the toss is made $X_R = X_G$ , so we need both equations:

For the red car:

$X_R=\frac{a_R*t^2}{2}$ With initial speed of 0 and acceleration of 6.12m/s^2.

For the green car:

$X_G=Xo + V_G*t$ With $V_G = 60km/h*\frac{1000m}{1km} * \frac{1h}{3600s} = 16.66m/s$ and Xo = 200m

Since both positions will be the same:

$\frac{a_R*t^2}{2}=Xo+V_G*t$ Solving for t:

t1 = -5.8s and t1 =11.25s

Replacing t = 11.25 on either equation to find the displacement:

$D = X_R = \frac{a_R*t^2}{2} = 387.28m$

3 0

4 years ago

A 31 kg block is initially at rest on a horizontal surface. A horizontal force of 83 N is required to set the block in motion. A

Hatshy [7]

Answer:

The static and kinetic coefficients of friction are 0.273 and 0.181, respectively.

Explanation:

By Newton's Laws of Motion and definition of maximum friction force, we derive the following two formulas for the static and kinetic coefficients of friction:

$\mu_{s} = \frac{f_{s}}{m\cdot g}$ (1)

$\mu_{k} = \frac{f_{k}}{m\cdot g}$ (2)

Where:

$\mu_{s}$ - Static coefficient of friction, no unit.

$\mu_{k}$ - Kinetic coefficient of friction, no unit.

$f_{s}$ - Static friction force, in newtons.

$f_{k}$ - Kinetic friction force, in newtons.

$m$ - Mass, in kilograms.

$g$ - Gravitational constant, in meters per square second.

If we know that $f_{s} = 83\,N$ , $f_{k} = 55\,N$ , $m = 31\,kg$ and $g = 9.807\,\frac{m}{s^{2}}$ , then the coefficients of friction are, respectively:

$\mu_{s} = \frac{83\,N}{(31\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)}$

$\mu_{s} = 0.273$

$\mu_{k} = \frac{55\,N}{(31\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)}$

$\mu_{k} = 0.181$

The static and kinetic coefficients of friction are 0.273 and 0.181, respectively.

4 0

3 years ago

A German Shepherd takes 4 hours to cover a distance, if it travels at a speed of 36mph. What should be its speed to cover the sa

agasfer [191]

Answer:

v₂ = 48 mph

Explanation:

We know that,

Speed = distance/time

A German Shepherd takes 4 hours to cover a distance, if it travels at a speed of 36mph.

We need to find the speed to cover the same distance in 3 hours.

$\dfrac{v_1}{v_2}=\dfrac{t_2}{t_1}\\\\v_2=\dfrac{v_1t_1}{t_2}\\\\v_2=\dfrac{36\times 4}{3}\\\\v_2=48\ mph$

So, the new speed is 48 mph.

3 0

3 years ago

An astronaut named Speedo takes a trip to Sirius, which is located a distance of 8 lightyears from the Earth. If the spaceship m

Softa [21]

Answer:

a. 10 years

b. 6 years

c. 12 years behind

Explanation:

speed of light c = 3x $10^{8}$ m/s

distance of sirius from earth = 8 lightyears = 8 x c x 60 x 60 x 24 x 365 = 252288000c meters

speed of spaceship = 0.8c

time taken to reach sirius = distance covered divided by speed

t = d/s = 252288000c/0.8c = 315360000 sec

1 year = 60 x 60 x 24 x 365 sec = 31536000 sec

315360000 sec = 315360000/31536000 = 10 yrs

the time as observed by Goslo will be shorter than the real time as measured within the ship due to relativistic effects. using the relativistic relation for time dilation we have

t' = t $\sqrt{1 - \frac{v^{2} }{c^{2} } }$

since v = 0.8c

v/c = 0.8

where t' is the relativistic time as observed by Goslo,

t is the time within the ship

t' = 10 x $\sqrt{1 - 0.8^{2} }$ = 6 yrs

If speedo turns around immediately after reaching sirius, his total distance will be 252288000c x 2 = 50457600c meter

time taken = 50457600c/0.8 = 630720000 sec = 20 yrs

time within the ship will be calculated from time dilation

t' = t $\sqrt{1 - \frac{v^{2} }{c^{2} } }$

t' = 20 x $\sqrt{1 - 0.8^{2} }$ = 378432000 sec = 12 years behind

4 0

3 years ago

Does specific heat of a substance depend on its temperature?​

Does specific heat of a substance depend on its temperature?