Answer:
The graph C.
Explanation:
The potential energy of the book is maximum when it is on the table; therefore, <em>the graph we are looking for must have maximum potential energy at </em>
Also, as the book falls down, its potential energy is decreasing; therefore, <em>the slope of the graph must be negative. </em>
Finally, as the book lands on the ground, its potential energy becomes zero; <em>therefore, the graph must show potential energy of zero at some time, i.e it must contain a point </em>
Now, looking at the four graphs given, we see that the graph C satisfies all our conditions, and therefore it is the correct choice.
For the sake of completeness, let us look at other choices.
<em>Graph A shows potential energy non linearly increasing—not true for a falling book.</em>
<em>Graph B shows potential energy increasing linearly—not true for a falling book because its potential energy is decreasing.</em>
<em>Graph D shows that potential energy of the book does not change—cannot be true since the book is falling.</em>
Answer:
A.) 78.4 J for both
B.) 78.4 J for both
C.) 8.85 m/s for both
D.) 17.7 kgm/s
Explanation:
Given information:
Mass m = 2 kg
Distance d = 20 m
High h = 4 m
A.) Gravitational potential energy can be calculated by using the formula
P.E = mgh
P.E = 2 × 9.8 × 4
P.E = 78.4 J
Since the two objects are identical, the gravitational potential energy of the block for both a and b will be 78.4 J
B.) According to conservative energy,
Maximum P.E = Maximum K.E.
Therefore, the kinetic energy of the two blocks will be 78.4 J
C.) Since K.E = 1/2mv^2 = mgh
V = √(2gh)
Solve for velocity V by substituting g and h into the formula
V = √(2 × 9.8 × 4)
V = √78.4
V = 8.85 m/s
The velocities of both block will be 8.85 m/s
D.) Momentum is the product of mass and velocity. That is,
Momentum = MV
Substitute for m and V into the formula
Momentum = 2 × 8.85 = 17.7 kgm/s
Both block will have the same value since the ramp Is frictionless.
Answer:
METABALIOCO HURAN GURGER THGDY
Explanation:
The answer is 125 Joules
The first thing to take note of is the work equation: W=F×D
Since we already have our force and our distance that will help make this problem easier.
So, W=25*5
W=125
Therefore, our answer is 125 Joules since work is measured in joules
Hope this helped!! :)
Kinetic, as inertia means to remain unchanged.