A photo frame with a mass of 2.8 kg is hung from a nail according to the opposite figure. If we know that the nail is located exactly in the middle of the string and the frame does not touch the wall, how many newton is the tensile strength of the string?

Answer:

The acceleration is 30 m/s²

Explanation:

Given that,

Maximum speed = 120 m/s

Time = 4.0 sec

We need to calculate the acceleration

Using equation of motion

[tex]v=u+at[/tex]

Where, v = speed

u = initial speed

a = acceleration

t = time

Put the value into the formula

[tex]120=0+a\times4.0[/tex]

[tex]a=\dfrac{120}{4.0}[/tex]

[tex]a=30\ m/s^2[/tex]

Hence, The acceleration is 30 m/s²

Answer:

360 meters

Explanation:

1. Set up a formula. Distance = Speed x Time

2. Plug in given information. d (distance) = 30m/s * 12s

3. Multiply numbers AND units. d = 360m

4. Check that units & numbers make sense.

Speed is a measure of how quickly an object moves.

The speed equation can be rearranged to calculate the distance traveled and the time required.

The total distance traveled in these 12 seconds = 360 m.

The total distance traveled in these 12 seconds = 30 m/s x12 sec

        =360 m.

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Answer:

B, E, F

Explanation:

Because cyberbullying happens online, text messages, social media networks, and chat rooms can all have cyberbullying, because they are all ways to chat online. D does not apply, because on most websites there are not ways to chat.

Answer:

B D E AND F

Explanation:

Answer:

2.65m/s

Explanation:

Using the equation of motion:

v² = u²+2a∆S where

v is the final velocity

u is the initial velocity

∆S is the change in distance

a is the acceleration

Given

u = 0m/s

a = 9.8m/s²

∆S = 1.3-0.943

∆S = 0.357m

Substituting the given parameters into the formula

v² = 0²+2(9.8)(0.357)

v² = 0+6.9972

v² = 6.9972

v=√6.9972

v = 2.65m/s

Hence the velocity at which it hit the ground is 2.65m/s

Answer:

It will cost $20.81

Explanation:

Cost of Electricity

The rate of the cost of electricity is usually expressed in $/KWH because the consumption of electricity is measured in Kilowatts-hour.

If a 25W porch light is on day and night for a full year, the electricity consumption is:

25W*24 H/Day*365 Day/year* 1 year=219,000 WH

converting to KWH: 219,000 WH = 219,000 /1000 KWH = 219 KWH

The rate is $0.095/KWH, thus:

The cost of electricity is 219 KWH*$0.095/KWH= $20.81

It will cost $20.81

Answer:true

Explanation:

Answer:

ok

Explanation:

Answer:

at 20km/h

Explanation:

Answer:

3.57632 m/s im not 100% sure but i think thats the answer

Explanation:

Answer: The ballon could get rub on a carpet to gain electricity and it would have enoght force

Explanation:

Answer:

See the explanation below

Explanation:

To solve this problem we will take the definition of linear momentum, which tells us that momentum is equal to the product of mass by the velocity vector. Since velocity is a vector, we will take the right-hand movement as positive and the left-hand movement as negative, the left-hand members are taken as before the collision and the right-hand members as after the collision

ΣM1 = ΣM2

(m1*v1) + (m2*v1) = (m1*v2) + (m2*v2)

V1 = velocity before the collision [m/s]

V2 = velocity after the collision [m/s]

m1 and m2 = mass of the vehicles [kg]

Therefore:

(240*2.3) - (260*2.7) = - (240*2.9) + (260*2.1)

Resolving this arithmetic operation we will have:

720 - 702 = - 696 + 546

- 150 = - 150

We can see that before the crash and after the crash the momentum is preserved

Answer:

8 m/s

Explanation:

All you have to do here is add 20 and 60 (giving you 80) and dividing by 10 seconds. 80/10= 8 m/s

Answer:

C. Fe: 24 electrons

Explanation:

From the analogy given, the atom with a charge of +2 is Fe having 24 electrons.

To calculate the charges on an atom;

     Number of charges = Number of protons - Number of electrons.

   O: 10 electrons: 8 protons = 8 - 10 = -2

   N: 10 electrons; 7 protons = 7 - 10 = -3

   Cl: 18 electrons; 17 protons = 17 - 18 = -1

So;

    Fe: 24 electrons and 26 protons = 26 -24  = +2

Therefore, the solution is Fe

Answer:

E = 120.77 J

Explanation:

Given that,

Mass of a baseball, m = 0.143 kg

Velocity of a baseball, v = 41.1 m/s

We need to find the kinetic energy of the baseball. We know that the kinetic energy of an object is associated with its motion. It can be given by the formula as follow :

[tex]E=\dfrac{1}{2}mv^2\\\\E=\dfrac{1}{2}\times 0.143\ kg\times (41.1\ m/s)^2\\E=120.77\ J[/tex]

So, the kinetic energy of the baseball is 120.77 J.

The kinetic energy of the baseball is 120.8 J.

The kinetic energy of an object is associated with its motion. It can be related to the mass and velocity as

K.E = 1/2 mv²

Given is the Mass of a baseball, m = 0.143 kg and Velocity of a baseball, v = 41.1 m/s

substitute the values, we have

K.E = 1/2 x 0.143 x (41.1)²

K.E =  120.77 J

Hence, the kinetic energy of the baseball is 120.8 J.

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Answer:

B

Explanation:

i took the test

Answer:

Physical change from solid to liquid where it is a reversible reaction as melted butter can be frozen to its original form

Answer:

rose

sunflower

seaweed

Answer: C Is The Answer

Explanation:

The option that best describes refraction is Option C. The bending of a wave as it passes at an angle from one material to another.

Refraction is the shift in direction induced by a wave's change in speed when it travels from one medium to another. It is the bending of light when it travels via a translucent medium. Refraction can take place in sound waves or water waves.

The statement is in Option A and Option B is incorrect because refraction does not blend but bend.

Similarly, from Option D, refraction does not reflect at an angle from a surface but reflection does.

Therefore, we can conclude that the Option that best describes refraction is seen in Option C, i.e. The bending of a wave as it passes at an angle from one material to another.

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Answer:

here lol

Explanation:

Answer:

Answer:

Balanced force

Explanation:

Balanced Forces, When forces are in balance, acceleration is zero. Velocity is constant and there is no net or unbalanced force. ... Although friction is acting on the person, there is no change in velocity and friction is not a net force in this case. Friction is only a net force if it changes the velocity of a mass.

The car is balanced.

If there are any forced acting on it, then those are balanced too.