Answer:
a. W = 2.17 x 10 ⁴ J
b. ΔU = - 5.03 x 10⁴ J
c. Q = 2.86 x 10 ⁻³ J
Explanation:
a.
The student work does 2.17 x 10⁴ J
So W = 2.17 x 10 ⁴ J
b.
The internal energy decreases 5.03 x 10⁴ J
ΔU = U₁ - U₂
ΔU = 0 - 5.03 x 10⁴ J = - 5.03 x 10⁴ J
c.
The formula heat can use:
Q = W + ΔU
Q = 2.17 x 10⁴ J + ( - 5.03 x 10⁴ J )
Q = 2.86 x 10 ⁻³ J
Answer:
x = 1.018 m
Explanation:
given,
height of man = 190 cm
= 1.9 m
scale reading on left = 450 N
scale reading on the right = 390 N
Let center of gravity of man be x distance from feet, feet is on right side.
For system to be in equilibrium moment about center should be equal to zero.
∑M = 0
now,
450(1.9 - x ) - 390 × x = 0
450(1.9 - x ) = 390 × x
855 - 450 x = 390 x
840 x = 855
x = 1.018 m
hence, point of center of gravity from feet is equal to x = 1.018 m
Answer:
0,93 atm
Explanation:
For this we will use PV = nRT
P is what we want to find
V = 1 L
n = 
= 0,038 moles
R = 0,082 
T = 25°C = 298,15 K
P * 1 = 0,038 *0,082 * 298,15
P = 0,93 atm
✷ Question: <span>When you stand with the wind blowing on your back, the low pressure center is _____.
Answer: Letter A
</span><span>✐ </span><span>Explanation: When wind hits your back, all the molecules are in front of you.
</span>Hope that helps! ★ If you have further questions or need more help, feel free to comment below or leave me a PM. -UnicornFudge aka Nadia
Answer:
25.3J
Explanation:
Given parameters:
Mass of aluminum = 3.05g
Initial temperature = 10.8 °C
Final temperature = 20 °C
Specific heat = 0.9J/g °C
Unknown:
Amount of heat needed for the temperature to change = ?
Solution:
To solve this problem, we use the expression:
H = m C Ф
H is the amount of heat
m is the mass
C is the specific heat capacity
Ф is the change in temperature
H = 3.05 x 0.901 x (20 - 10.8) = 25.3J
