Answer:
(a) W=1.20×10⁴J
(b) U= -5.46×10⁴J
(c) Q= -4.26×10⁴J
Explanation:
Given that student does 1.20×10⁴J work
(a) W=1.20×10⁴J
Work done by student,so positive sign
During the process, his internal energy decreases by 5.46×10⁴J.
(b) U= -5.46×10⁴J.
As the Energy decreases therefore negative sign
For (c) Q
We know the formula
Answer:
D.
The forces on the book are balanced because the gravity pulling down on the book is equal to the upward force applied by the table.
The answer is 125 because if u add you'll get the answer
Answer:
Given: Initial Velocity:0
Velocity: 25 m/s
Time :10 sec.
Acclereation?.
Use formula for acceleration,
Divide units to
So our acceleration is
If you want to, you can use kinematic equation
vi is inital velocity, since v1=0 we just have
Which is the same as first step, so we would get 2.5 m/s^2