Answer:
a. 4.25 J
b. -14.90 J
Explanation:
a. Gravitational potential energy of stone-earth system before stone is released
E = MGY
M = mass = 0.31
G = gravity = 9.81
Y = 1.4
E = 0.31 x 9.81 x 1.4
E = 4.25J
b. Gravitational potential energy of stone-earth system when it reaches bottom of well
E = MGY
M= 0.31
G = 9.81
Y = -4.9
E = 0.31 x 9.81 x -4.9
E = -14.90 J
This answers the question.
The factors that affect efficiency are //
Conductor content – load dependent.
Magnetic steel -mainly constant.
Thermal design – mainly load dependent.
Aerodynamic design – constant.
Manufacture and quality control – constant
Answer:
Slope = 0.50.
Explanation:
Below is an attachment containing the solution to the question.
Answer: A
Explanation:
B is incorrect- forming new substances is a chemical change
C is incorrect- producing a new substance and “reacting” also suggests a chemical change.
D. Is incorrect- ability to react is a chemical property
Explanation:
<u>Forces</u><u> </u><u>on</u><u> </u><u>Block</u><u> </u><u>A</u><u>:</u>
Let the x-axis be (+) towards the right and y-axis be (+) in the upward direction. We can write the net forces on mass as
Substituting (2) into (1), we get
where , the frictional force on Set this aside for now and let's look at the forces on
<u>Forces</u><u> </u><u>on</u><u> </u><u>Block</u><u> </u><u>B</u><u>:</u>
Let the x-axis be (+) up along the inclined plane. We can write the forces on as
From (5), we can solve for <em>N</em> as
Set (6) aside for now. We will use this expression later. From (3), we can see that the tension<em> </em><em>T</em><em> </em> is given by
Substituting (7) into (4) we get
Collecting similar terms together, we get
or
Putting in the numbers, we find that . To find the tension <em>T</em>, put the value for the acceleration into (7) and we'll get . To find the force exerted by the inclined plane on block B, put the numbers into (6) and you'll get