Explanation:
Amount of heat supplied (Q) = 24500 J
Mass (m) = 2 kg
Initial temperature (t1) = 20 ° C
Final temperature (t2) = 35 ° C
Difference in temperature (dt) = t2 - t1 = ( 35 - 20) °C = 15 ° C
Now Specific heat capacity (S) = ?
We know we have the formula;
Q = m * s * dt
24500 = 2 * s * 15
24500 = 30 S
S = 24500 / 30
S = 816.67 J / Kg ° C
The specific heat capacity is 816.67 J/kg°C.
Hope it will help :)
Answer:
10.284 kgm/s
4.674545 kN
Explanation:
t = Time taken
u = Initial velocity
v = Final velocity
m = Mass of baselball
Impulse
![J=m(v-u)\\\Rightarrow J=0.12(38.4-(-47.3))\\\Rightarrow J=10.284\ kgm/s](https://tex.z-dn.net/?f=J%3Dm%28v-u%29%5C%5C%5CRightarrow%20J%3D0.12%2838.4-%28-47.3%29%29%5C%5C%5CRightarrow%20J%3D10.284%5C%20kgm%2Fs)
Impulse of the baseball is 10.284 kgm/s
Impulse is also given by
![J=Ft\\\Rightarrow F=\frac{J}{t}\\\Rightarrow F=\frac{10.284}{2.2\times 10^{-3}}\\\Rightarrow F=4674.545\ N=4.674545\ kN](https://tex.z-dn.net/?f=J%3DFt%5C%5C%5CRightarrow%20F%3D%5Cfrac%7BJ%7D%7Bt%7D%5C%5C%5CRightarrow%20F%3D%5Cfrac%7B10.284%7D%7B2.2%5Ctimes%2010%5E%7B-3%7D%7D%5C%5C%5CRightarrow%20F%3D4674.545%5C%20N%3D4.674545%5C%20kN)
The magnitude of the average force exerted by the bat on the ball is 4.674545 kN
Answer:
The polar coordinate of
is
.
Explanation:
Given a point in rectangular form, that is
, its polar form is defined by:
(1)
Where:
- Norm, measured in meters.
- Direction, measured in sexagesimal degrees.
The norm of the point is determined by Pythagorean Theorem:
(2)
And direction is calculated by following trigonometric relation:
(3)
If we know that
and
, then the components of coordinates in polar form is:
![r = \sqrt{(-3.50\,m)^{2}+(-2.50\,m)^{2}}](https://tex.z-dn.net/?f=r%20%3D%20%5Csqrt%7B%28-3.50%5C%2Cm%29%5E%7B2%7D%2B%28-2.50%5C%2Cm%29%5E%7B2%7D%7D)
![r \approx 4.301\,m](https://tex.z-dn.net/?f=r%20%5Capprox%204.301%5C%2Cm)
Since
and
, direction is located at 3rd Quadrant. Given that tangent function has a period of 180º, we find direction by using this formula:
![\theta = 180^{\circ}+\tan^{-1} \left(\frac{-2.50\,m}{-3.50\,m} \right)](https://tex.z-dn.net/?f=%5Ctheta%20%3D%20180%5E%7B%5Ccirc%7D%2B%5Ctan%5E%7B-1%7D%20%5Cleft%28%5Cfrac%7B-2.50%5C%2Cm%7D%7B-3.50%5C%2Cm%7D%20%5Cright%29)
![\theta \approx 215.538^{\circ}](https://tex.z-dn.net/?f=%5Ctheta%20%5Capprox%20215.538%5E%7B%5Ccirc%7D)
The polar coordinate of
is
.
Answer:
A corrente elétrica que atravessa o aparelho de som é de 2 A.
LETRA C
Explanation:
A fórmula para se calcular a corrente, em função da potência e a tensão é a seguinte:
\begin{lgathered}W = A * V\\\\\boxed{A = \frac{W}{V} }\end{lgathered}W=A∗VA=VW
onde,
A: corrente;
W: potência, no caso, 254 W;
V: tensão, no caso, 127 V.
Aos cálculos:
A = W / V
A = 254 / 127
A = 2 A
![\star](https://tex.z-dn.net/?f=%5Cstar)
![\blue\star](https://tex.z-dn.net/?f=%5Cblue%5Cstar)
<h3>
![\blue\star](https://tex.z-dn.net/?f=%5Cblue%5Cstar)
Given</h3>
- mass = 200kg
- acceleration = 10m\s^2
Star coding
<h3>
![\blue\star](https://tex.z-dn.net/?f=%5Cblue%5Cstar)
As we know that force = mass × acceleration</h3>
- F = m×a
- F = 200 ×10
- F = 2000N
<h3>
![\blue\star](https://tex.z-dn.net/?f=%5Cblue%5Cstar)
so mate here is ur ans force is equal to 2000N.</h3>
Hope it helps