According to the law of conservation of energy, which changes would

increase the total energy of a system?

A. An addition of 400 J of GPE and a loss of 250 J of thermal energy

B. An addition of 100 J of thermal energy and a loss of 450 J of

kinetic energy

C. An addition of 200 J of kinetic energy and a loss of 250 J of

thermal energy

D. An addition of 300 J of thermal energy and a loss of 450 J of

kinetic energy

Answer:

b

Explanation:

Answer:

Approximately [tex]0.8\; \rm s[/tex] (assuming that air resistance is negligible.)

Explanation:

Let [tex]v_0[/tex] denote the initial velocity of this ball. Let [tex]\theta[/tex] denote the angle of elevation of that velocity.

The initial velocity of this ball could be decomposed into two parts:

If air resistance on this ball is negligible, [tex]v_0(\text{vertical})[/tex] alone would be sufficient for finding the time of flight of this ball.

Calculate [tex]v_0(\text{vertical})[/tex] given that [tex]v_0 = 8 \; \rm m \cdot s^{-1}[/tex] and [tex]\theta = 30^\circ[/tex]:

[tex]\begin{aligned}& v_0(\text{vertical}) \\ &= v_0 \cdot \sin(\theta) \\ &= \left(8 \; \rm m \cdot s^{-1} \right) \cdot \sin\left(30^{\circ}\right) \\ &= 4\;\rm m \cdot s^{-1} \end{aligned}[/tex].

Assume that air resistance on this ball is zero. Right before the ball hits the ground, the vertical velocity of this ball would be exactly the opposite of the value when the ball was launched.

Since [tex]v_0(\text{vertical}) = 4\; \rm m \cdot s^{-1}[/tex], the vertical velocity of this ball right before landing would be [tex]v_1(\text{vertical}) = -4\; \rm m \cdot s^{-1}[/tex].

Calculate the change to the vertical velocity of this ball:

[tex]\begin{aligned}& \Delta v(\text{vertical}) \\ & = v_1(\text{vertical}) - v_0(\text{vertical}) \\ &= -8\; \rm m \cdot s^{-1}\end{aligned}[/tex].

In other words, the vertical velocity of this ball should have change by [tex]8\; \rm m \cdot s^{-1}[/tex] during the entire flight (from the launch to the landing.)

The question states that the gravitational field strength on this ball is [tex]g = 10\; \rm m \cdot s^{-2}[/tex]. In other words, the (vertical) downward gravitational pull on this ball could change the vertical velocity of the ball by [tex]10\; \rm m\cdot s^{-1}[/tex] each second. What fraction of a second would it take to change the vertical velocity of this ball by [tex]8\; \rm m \cdot s^{-1}[/tex]?

[tex]\begin{aligned}t &= \frac{\Delta v(\text{initial})}{g} \\ &= \frac{8\; \rm m \cdot s^{-1}}{10\; \rm m \cdot s^{-2}} = 0.8\; \rm s\end{aligned}[/tex].

In other words, it would take [tex]0.8\; \rm s[/tex] to change the velocity of this ball from the initial velocity at launch to the final velocity at landing. Therefore, the time of the flight of this ball would be [tex]0.8\; \rm s\![/tex].

Answer:

I believe the answer is B. Although it might be C.

Explanation:

I hope this helps!

Answer:

A

Explanation:

this is because the law of reflection states that the angle of incidence equals to the angle of the reflection.

hope this helps, if not please report it

someone else can try it

Answer: Maximum potential energy is at point R. (C)

Explanation: At point R, the ball lost all of its kinetic energy since it stopped moving upwards. It then gained potential energy due to gravity, and started moving downwards.

Answer:

The leverage or mechanical advantage of pulleys is less obvious, but you can "gang" multiple pulleys together into two sets (blocks) and run the ropes back and forth between the two sets to increase the number of lengths of rope running between them. One end of the rope is connected (fixed) to one of the blocks, and you get to pull on the other end after it is passed back and forth between the blocks of pulleys. This is sometimes called a block and tackle arrangement. With a hook on each side of the block set, you can move a heavy load much like levers do, by multiplying the force. You have to pull more rope just like you have to move a lever more on one side of the fulcrum as compared to the other. When you get all the rope pulled out that you can, you can not move the load anymore because you have become "two-blocked" which means the two blocks are together. Credits to: Moin Khan

Answer:

answer

Explanation:

this is the answer with annotation and law

Answer:

Explanation:

Mechanical energy is the sum of all potential energy and kinetic energy .

Answer:

Answer:

Acceleration

Explanation:

plato

Answer:

A. 131.9 s

B. 0.13 m/s

Explanation:

From the question given above, the following data were obtained:

Mass (m) = 490 Kg

Height (h) = 17 m

Power (P) = 0.83 hp

Time (t) =?

Velocity (v) =.?

Next, we shall convert 0.83 hp to Watts. This can be obtained as follow:

1 hp = 745.7 Watts

Therefore,

0.83 hp = 0.83 hp × 745.7 Watts / 1 hp

0.83 hp = 618.931 Watts

Thus, 0.83 hp is equivalent to 618.931 Watts.

A. Determination of the time.

Mass (m) = 490 Kg

Height (h) = 17 m

Power (P) = 618.931 Watts

Acceleration due to gravity (g) = 9.8 m/s²

Time (t) =?

Power = Energy / time

P = mgh / t

618.931 = 490 × 9.8 × 17 / t

618.931 = 81634 / t

Cross multiply

618.931 × t = 81634

Divide both side by 618.931

t = 81634 / 618.931

t = 131.9 s

Therefore, it will take 131.9 s to lift the beam.

B. Determination of the constant velocity.

We'll begin by calculating the force. This can be obtained as follow:

Mass (m) = 490 Kg

Acceleration due to gravity (g) = 9.8 m/s²

Force (F) =?

Force = mass × acceleration

Force = 490 × 9.8

Force = 4802 N

Finally, we shall determine the constant velocity as follow:

Force (F) = 4802 N

Power (P) = 618.931 Watts

Velocity (v) =?

P = F × v

618.931 = 4802 × v

Divide both side by 4802

v = 618.931 / 4802

v = 0.13 m/s

Thus, the constant speed at which the beam moves upward is 0.13 m/s

Answer:

The World Series

Explanation:

The Super Bowl is the championship American Football game, and the World Cup is the Soccer/Football game.

American Football and Football are different things. The first is what Americans call football, while the other is what Americans call soccer. It is confusing.

Answer:

[tex].[/tex]

Explanation:

sunspots are areas that appear dark on the sun's surface.They appear dark because they are colder that parts of the sun's surface. However, the temperature of a sunspot is still very high. This can cause a sudden burst of energy space. If a solar flare is very intense, the radiation it releases can interfere with our radio communication here on earth

Answer:

Sophie gained 1,599.36 J of GPE

Explanation:

Gravitational Potential Energy  (GPE)

Gravitational potential energy is the energy stored in an object because of its vertical position or height in a gravitational field.

It can be calculated with the equation:

U=mgh

Where:

m = mass of the object

h  = height with respect to a fixed reference

g  = acceleration of gravity ([tex]9.8 m/s^2[/tex])

Sophie has a mass of m=48 Kg and climbs a ladder that takes her to a height of h=3.4 m.

Calculate the GPE she gained:

U = 48 * 9.8 * 3.4

U = 1,599.36 J

Sophie gained 1,599.36 J of GPE

Answer: NOT B) Electric potential energy is the charge divided by the electric potential difference.

Explanation:

just missed it on edg

Answer: Choice C

Explanation:

Answer:

80 grams

Explanation:

multiplying 8 by 2.5 to get 20

so then deviding 200 by that 2.5 will get you 80 grams

This question involves the concepts of equlibrium and moment.

The mass of unknown object should be "500 g".

In order to balance the meter stick equilibrium should be achieved. For equilibrium the moment due to each mass must be the same.

[tex]F_1d_1=F_2d_2\\m_1gd_1=m_2gd_2\\m_1d_1=m_2d_2[/tex]

where,

Therefore,

[tex](200\ g)(20\ cm)=(m_2)(8\ cm)\\\\m_2=\frac{(200\ g)(20\ cm)}{8\ cm}[/tex]

m₂ = 500 g

Learn more about moment here:

https://brainly.com/question/6278006

Answer:

Up AND Down

Explanation:

a transverse wave goes up and Down

Answer:

The pressure given by the water at the bottom is 58,800 Pa

Explanation:

Pressure Exerted by a Column of Liquid

The pressure P exerted by a column of liquid of height h and density ρ is given by the hydrostatic pressure equation:

P = ρgh

Where ρ is the density of the liquid, g is the acceleration of gravity g=9.8m/s^2, and h is the height of the column of liquid.

The height of water in a well is h=6 m. The density of water is a known quantity:

[tex]\rho = 1,000\ kg/m^3[/tex]

Calculating P:

P = 1,000*9.8*6

P = 58,800 Pa

The pressure given by the water at the bottom is 58,800 Pa

Answer:

i think yes, because the sand together with the filters catches all the impurities of the water that will pass through them. (btw sorry for my English, this is translated from my language in translator, so don't mind my English pls)

Answer:

the quantity which has both magnitude and direction is called vector quantity

Answer:

Nobody knows...

Explanation:

Explanation:

how to alweays win amoung us_

Answer:

The answer is False

Explanation:

Hope this helps :)

Answer:

New resistance = 243 ohm

Explanation:

Given:

Current resistance = 27 ohm

Computation:

The wire is extended to three times its initial size, and its cross-section is therefore shortened to one-third of how it used to be. We found the current resistance to be 3x3= 9 times 

So,

New resistance = 27 x 9

New resistance = 243 ohm

Answer:

Mechanical waves

Longitudinal waves

Explanation:

Sound waves are mechanical waves because they require a medium to transport their energy from one place to another.

Sound waves are longitudinal waves because the vibration of sound is transported parallel to the direction that the sound waves move.

Answer:

Newton's third law of motion.

Explanation:

We are told the force needed to throw the full soda can was more than that needed to throw the empty can.

Now, the weight of the full soda can will be more than that of the empty can. Therefore, the full can will demand more force than that of the empty can due to Newton's third law of motion which states that to every action, there is an equal and opposite reaction.

Answer:

the second one i guess????

Explanation:

Answer:

He closed all of the nation’s banks and ordered inspections

Explanation:

Answer:

thermosphere...........