7. A 25 N block is lowered 1.2 m by a 20 N force.
a. Draw a free-body diagram of the forces acting on the block.
b. How much work does the force of gravity do on the box? Is this work positive or negative?
c. How much work does the applied force do on the box? Is this work positive or negative?

Answer:

reduced

Explanation:

The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example

Answer:

Image is between F and 2F. And the exact location is:

q = 10.84 cm

Explanation:

The convex lens form different kinds of images with different sizes and locations, for the different positions of an object. In this case, the object is placed 30.5 cm from the convex lens with a focal length of 8 cm. This means that it is the case of the object placed beyond 2F. In this case, the image formed has the following characteristics:

1. Image is real.

2. Image is inverted

3. Image is diminished

4. Image is located between F and 2F

For exact location we use the thin lens formula:

[tex]\frac{1}{f} = \frac{1}{p} + \frac{1}{q}[/tex]

where,

f = focal length = 8 cm

p = object distance = 30.5 cm

q = image distance = ?

Therefore,

[tex]\frac{1}{8\ cm} = \frac{1}{30.5\ cm} + \frac{1}{q} \\\frac{1}{8\ cm} - \frac{1}{30.5\ cm} = \frac{1}{q}[/tex]

q = 10.84 cm

Answer:

I think it is mechanical energy

Answer:

Most coastal areas, with some exceptions, experience two high tides and two low tides every lunar day (Ross, D.A., 1995). Almost everyone is familiar with the concept of a 24-hour solar day, which is the time that it takes for a specific site on the Earth to rotate from an exact point under the sun to the same point under the sun. Similarly, a lunar day is the time it takes for a specific site on the Earth to rotate from an exact point under the moon to the same point under the moon. Unlike a solar day, however, a lunar day is 24 hours and 50 minutes. The lunar day is 50 minutes longer than a solar day because the moon revolves around the Earth in the same direction that the Earth rotates around its axis. So, it takes the Earth an extra 50 minutes to “catch up” to the moon (Sumich, J.L., 1996; Thurman, H.V., 1994).

the answer is C

Mixed semidiurnal tides is the type of wave that coastline on Earth experiences.

Mixed semidiurnal tides is the type of wave that coastline on Earth experiences.

To learn more about Mixed semidiurnal tides refer:https://brainly.com/question/14681092

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Answer:b.outward in a straight line tangent to the circle!

Explanation:at any given point on the circle is always along the tangent line.

s = displacement; u = initial velocity; t = time of motion

Answer:

a = 0.8m/s^2

F = 39.28 N

Explanation:

Sum of forces in X direction = 650cos(35)N-493.249N

Sum of forces in X direction= 39.28 N

F = m*a

a = F/m

a = 39.28N/49kg

a = 0.8 m/s^2

Answer:

Explanation:

The sealed bottle serves as an open system for the water molecules, thus heat energy can be exchanged with its surroundings. When the bottle is placed in a warm environment, there would be a gradual increase in the thermal energy of the molecules of water due to a change in the temperature of its surroundings.

Thus, the molecules of water closer to the boundary of the bottle absorbs heat, becomes lighter and changes position. This gradual process continues until all molecules attains an average temperature which equals that of the surroundings of the bottle.

Therefore, both the thermal energy and temperature of the water increases.

Answer

0.1 - 0.5 nano meters

Explanation:

Here ya go buddy! :D

Answer:

Explanation:

The water particles just flow through each other. They cannot be destroyed nor created.

Answer:

The water cooling down is due to evaporation, the heat is simply changing the state of matter of the water. Energy is being used to change it's state. Evaporation causes the cooling down of something. Think of sweat?

Explanation:

Answer:

The sled will slow down in speed

Explanation:

According to Newton's first law of motion, a body will continue to be at rest or uniform motion unless acted upon by an external force.

In this situation, once the connecting rope between the sled and the dogs breaks, the motion of the sled will reduce because it is no longer connected to the dog that is providing the motion, hence the source of motion is no longer connected to the sled

Answer:

a - 1996

Explanation:

Answer:

1900

Explanation:

It's football but for the U.S terms, they call it Soccer, and it was in 1900

[tex] \large{ \text{Hii, Hope \: you \: are \: fine!}}[/tex]

4321 is the answer

Answer:

True

Explanation:

i searched it up and well this thing is making me do it up till 20 characters long so yea

Answer:

[tex]F_A =5.625*10^1^6N[/tex]

Explanation:

From the question we are told that

50,000 years ago,

A giant 4.5 107-kg meteor

180-m-deep hole

20,000 m/s

Generally for this problem the energy change is given as

       [tex]\triangle E=\frac{1}{2} mv^2 +mgd[/tex]

Having the potential and kinetic energy in place

Mathematically  solving for Average force[tex]F_A[/tex]

       [tex]\triangle E=F_a*d[/tex]

[tex]F_A =\frac{1/2* 4.5*10^7(20,000)^2-kg+4.5*10^7*9.81*160}{160}[/tex]

Therefore Average force [tex]F_A[/tex] is given by

[tex]F_A =5.625*10^1^6N[/tex]

Answer:

in a plane flying above Earth

Explanation:

Gravity is the force that draws  objects toward center of the earth. If you throw an object up on the earth's surface, you will notice that it will fall back to the ground due to the earth's gravitational pull on the object.

However, the further one goes from the earth's surface, the lesser the gravitational pull. Therefore the cat will experience less gravitational pull in an airplane flying at a higher altitude.

Answer:

Answer:

More than 60% of the total refractive power of the eye is attributed to the cornea making it vital to focusing light onto the retina for visual processing 115.

Explanation:

For optimal vision, the cornea must efficiently transmit incident light by maintaining its transparency.

Answer:

About 29.5

Explanation:

Answer:

7 days or a week

Explanation:

Answer:

From Savos point of view, Gadros appear not to be moving

Explanation:

The given parameters are;

The distance between Godric and Savos = A few meters

The location of Godric and Savos = One end of the field

The location pf Peter = The other end pf the field

The speed with which Godric and Savos are moving towards Peter = 4 m/s

Let the positive x-direction be the direction in which Godric and Savos are moving

Therefore;

The speed and direction with which Godric is moving = The speed and direction with which Savos is moving = 4·i m/s

From Savos point of view, the relative speed with which Godric is moving = (The speed and direction in which Godric is moving) - (The speed and direction in which Savos is moving) = 4·i m/s - 4·i m/s = 0 m/s

Therefore, from Savos point of view, the relative speed with which Godric is moving = 0 m/s or Gadros appears stationary or not to moving.

Answer: D

Explanation:

Answer:

Below :)

Explanation:

It is the powerhouse of the cell and creates chemical energy.

Answer: Oxygen

Explanation: Oxygen is the most common element in the human body. It makes up 65% of the body.

Answer:

[tex]T= 11.0003[/tex]s

Explanation:

From the question we are told that

The outer ring with a radius of 30 m

inner Gravity Approximately 9.80 m/s'

Outer Gravity Approximately 5.35 m/s.

Generally  the equation for centripetal force is given mathematically as

Centripetal acceleration enables Rotation therefore?

     [tex]\omega ^2 r =Angular\ acc[/tex]

Considering the outer ring,

 [tex]\omega ^2 r = 9.8[/tex]

  [tex]\omega ^2= \frac{9.8}{30}[/tex]

 [tex]\omega = \sqrt{\frac{9.8}{30}}[/tex]

 [tex]\omega= 0.571 rad/s[/tex]

Therefore solving for  Period T

Generally the equation for solving Period T is mathematically given as

 [tex]T= \frac{2\pi}{\omega}[/tex]

 [tex]T= \frac{2\pi}{0.571 rad/s}[/tex]

 [tex]T= 11.0003[/tex]s

Answer:

3

Explanation:

If there is 3 at the moment (atm) is the same as might be (mb) in the air.

Force  M2 exerts on tension T

T = M2 g

T = M1 g sin theta - M1 g u cos theta

Note that M1 g is exerted down the plane while the frictional force opposes this motion and will be directed in the opposite direction of M1 g

M2 g = M1 g sin theta - u M1  g cos theta

1 = 2 sin 36 - u 2 cos 36

.5 = sin 36 - u cos 36

u = (sin 36 - .5) / cos 36 = .108

Any friction less that this will result in sliding

"1.7456" would be the minimum coefficient of static friction required.

Given:

Angle,

Mass,

To keep the system in equilibrium forces acting on mass "[tex]m_1[/tex]" must balance forces acting on "[tex]m_2[/tex]".

That's,

→ [tex]Forces \ on \ m_1 \ downward \ along \ ramp = Forces \ on \ m_2 \ downwards[/tex]

or,

→ [tex]m_1 g Sin \Theta + \mu_s m_1 g Cos \Theta =m_2 g[/tex]

Thus,

→ [tex]\mu_s = \frac{m_2 g - m_1 g Sin \Theta}{m_1 g Cos \Theta}[/tex]

       [tex]= \frac{m_2-m_1 Sin \ 36^{\circ}}{m_1 Cos \Theta}[/tex]

hence,

→ [tex]\mu_s = \frac{2 m_1 - m_1 Sin \ 36^{\circ}}{m_1 Cos \ 36^{\circ}}[/tex]

       [tex]= 1.7456[/tex]

Thus the above answer is right.

Learn more:

https://brainly.com/question/14747133

Answer: The statement when the motion energy of an object changes, energy is being transferred is true.

Explanation:

Motion energy is also called mechanical energy and it is the summation of kinetic energy and potential energy stored in an object required for work.

As kinetic energy is the energy acquired due to motion of an object and potential energy is the energy acquired by an object due to its position.

For example, when a moving ball strikes another ball causing it to move then energy is being transferred from one ball to another.

Therefore, the statement when the motion energy of an object changes, energy is being transferred is true.

Answer:

In my knowledge

Option B. Lava flowed from the moon

and I am pretty sure cause I have read about it and option B is the conclusion I came with lol :D