Answer:
+ 900 J
Explanation:
Since the total energy change ΔE = internal energy change ΔU since there is no change in kinetic and potential energy,
ΔE = ΔU
ΔE = Q - W where Q = heat absorbed by system and W = work done by system
Now since the system absorbs 500 J of heat, Q = + 500 J and work of 400 J is done on the system, W = -400 J
So, the values of the variables into the equation, we have
ΔE = Q - W
ΔE = + 500 J - (-400 J)
ΔE = + 500 J + 400 J
ΔE = + 900 J
So, the internal energy change, ΔE = + 900 J
Answer:
Last option <u>F</u>
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Answer:
2.1 m/ss
Explanation:F=ma a=F/M a=4,200/2,000= a=2.1 m/ss
Answer:
V_c=5.037 m/s
Explanation:
SOLUTION:
applying the conversation of energy, taking the datum at B
V_b=(m_c+m_b)gh_a=(3+0.5)*9.81*0=0 J
V_b=4.95 m/s
applying the conversation of linear momentum,
(m_c+m_b)V_b=m_c*V_c+m_b*V_b
V_b=6*V_c-34.66 (1)
utilising the relative velocity relation,
V_b/c=V_b-V_c
V_b=0.6-V_c (2)
from (1) (2)
6*V_c-34.66=0.6-V_c
7*V_c=35.26
the final velocity of the cart is
V_c=5.037 m/s
into (2)
V_b=0.6-V_c
V_b=0.6-5.037
= 4.437
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