It takes a crane 60 seconds to lift a 150kg box from the ground to the top of a 100m tall building. Calculate the magnitude of power exerted by the crane to lift the box

A. 9 x 109 W

B. 9 x 109 N

C. 2450 W

D. 2450 N

E. None of the above

Answer:

$ 0.17

Explanation:

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

Power (P) = 90 Watts

Time (t) = 1 day

Cost per KWh = $ 0.08

Cost of operation =?

Next, we shall convert 90 W to KW. This can be obtained as follow:

1000 W = 1 KW

Therefore,

90 W = 90 W × 1 KW / 1000 W

90 W = 0.09 KW

Next, we shall express 1 day in hour. This is shown below:

1 day = 24 hours

Next, we shall determine the energy consumption. This can be obtained as follow:

Power (P) = 0.09 KW

Time (t) = 24 h

Energy (E) =?

E = Pt

E = 0.09 × 24

E = 2.16 KWh

Finally, we shall determine the cost of operation. This can be obtained as follow:

Energy (E) = 2.16 KWh

Cost per KWh = $ 0.08

Cost of operation =?

Cost of operation = Energy × Cost per KWh

Cost of operation = 2.16 × 0.08

Cost of operation = $ 0.17

Thus, the cost of operating the light bulb for one day is $ 0.17

Answer: Try pumping the brake pedal to increase pressure.

Explanation:

When the brake of a vehicle fails when driving, it's important to pump the brake pedal to increase pressure.

Sometimes, there may be a soft brake due to the fact that the brake master cylinder of the vehicle cannot full pressure which is necessary for the braking power.

One should quickly pump the brake pedal with his or her foot so as to generate enough pressure which will be necessary in stopping safely.

Answer:

solution given:

frequency[f]=215.0Hz

velocity[V]=x

wave length=2.4m

we have

wave length=[tex] \frac{V}{f} [/tex]

2.4m=[tex] \frac{x}{215} [/tex]

2.4×215=[tex] \frac{x}{} [/tex]

x=516 m/s

velocity=speed =516m/s

Answer:

516 m/s

Explanation:

Velocity = Frequency * Wavelength

If wavelength = 2.4m, and Frequency =   215 hz

Then Velocity = 2.4 * 215 which is equal to 516

Hence, velocity = 516 m/s

Answer:

A: -2.6 × 10^(-6) C and 2.6 × 10^(-6) C

Explanation:

According to coulombs law, the formula for the force between 2 charged particles is;

F = kq1•q2/r²

Where;

F is Force = |1N|

q1 and q2 are the charges of both particles

k is coulombs constant = 9 × 10^(9) N.m²/C²

r is distance between particles = 0.25

Now, the force |1N| means -1 or +1

Thus;

-1 = 9 × 10^(9) × q1•q2/(0.25)²

Or

1 = 9 × 10^(9) × q1•q2/(0.25)²

Thus;

q1•q2 = -6.94 × 10^(-12)

Or q1•q2 = 6.94 × 10^(-12)

Now, we are told that the magnitude of both charges are the same.

Thus;

q² = 6.94 × 10^(-12)

q = √(6.94 × 10^(-12))

q = 2.6 × 10^(-6) C

Since from earlier, we saw that;

q1•q2 = -6.94 × 10^(-12)

Or q1•q2 = 6.94 × 10^(-12)

Thus means that one of the charges will be negative while the other will be positive.

Thus, the charges are;

-2.6 × 10^(-6) C and 2.6 × 10^(-6) C

Answer:

the basketball player must leave the ground with a velocity of 4.748 m/s

Explanation:

Given that data in the question;

From the third equation of motion;

v² - u² = 2as

such that;

u² = v² - 2as

where u is the initial velocity, v is the final velocity, s is the displacement and a is acceleration

so initial velocity of the basket ball player will be;

u = √( v² - 2as )

so from the question; s is 1.15 m and a = - 9.8 m/s² { player is under negative acceleration to get to the ball } and final velocity of the player will be 0.

so we substitute

u = √( (0)² - (2 × -9.8 × 1.15 )

u = √ -( - 22.54 )

u = √ ( 22.54 )

u = 4.748 m/s

Therefore, the basketball player must leave the ground with a velocity of 4.748 m/s

Answer:

1. Stay out of floodwater.

2. Never use a wet electrical device.

3. If the power is out, use flashlights instead of candles.

4. Prevent carbon monoxide poisoning.

5. Be careful near damaged buildings.

6. Stay away from power lines.

7. Protect yourself from animals and pests.

8. Drink safe water. Eat safe food.

Answer: First stage

Explanation:

The four stages of technological design include:

• identifying a problem.

• Designing a solution.

• Implement, build, and test the design.

• Determine if solution met the need.

In this scenario, Robert Shuman identified the problem. This was depicted as he stated that coal and oil would eventually run out and that humans needed to learn how to use the more-abundant energy resource of the Sun,

Explanation:

Because, there is not atmosphere in vacuum. So, sound does not propagate through a vacuum.

Answer:

Δx = 2m

Explanation:

From the given information:

De la información dada:

El desplazamiento ocurrió en un vector que se mueve desde una posición inicial particular hasta el final.

Entonces, supongamos que el desplazamiento es D;

Luego:

D = (7,5 ) - (5,7)

D = (2, -2)

Por lo tanto, el valor del desplazamiento de la coordenada x; Δx = 2m

The 2nd note will have a higher frequency or pitch.

Explanation:

The frequency of a standing wave in a string is given by

[tex]f = \frac{ \sqrt{ \frac{t}{ (\frac{m}{l} )} } }{2l} [/tex]

where t = tension of the string

m/l = mass density of the string

l = length of the string

By placing your finger on the string, you increase the tension and at the same time, shorten the length of the string, thereby increasing the frequency of the sound due to the standing wave produced on the string.

Answer:

2. Given:

m=1000Kg

a=(9.8m/s)^2

F=m×a

=9.8×1000

=9800N

3.Given:

m=50kg

f=500N

F=m×a

500N=50Kg×a

50kg×a=500N

a=500÷50

a=(10m/s)^2

Covalent

Explanation:

Covalent Bond

Answer:

diphosphorus trioxide

Explanation:

Answer:

Explanation:

We need the power equation for this which is

P = Work/time

We have everything we need to solve this (the mass of the object is extra information):

P = 6860/4

P = 1715W

Answer: B

Explanation: The higher temperature increases the reaction rate but also favors the reverse read on.

The higher temperature increases the reaction rate, but it also favors the reverse read on. So, option B.

The pace at which the products are created from the reactants in a chemical reaction is referred to as the rate of reaction.

Here,

Generally, reactions progress more quickly as the temperature rises.

The average kinetic energy of the reactant molecules will rise with a rise in temperature. The number of molecules having threshold energy rises, increasing the quantity of efficient collisions that actually occur.

Therefore, as the temperature of the reaction is increased, the rate of the reaction increases. But also favors the reverse reaction.

Hence,

The higher temperature increases the reaction rate, but it also favors the reverse read on.

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Rubbing both pieces cause each piece to have a negative charge.

When two parts have the same they repel each other, so holding one piece up tot he end of the other piece would push it away.

Because one piece is held in the middle by a string, it would rotate the piece in a circle.

If they held the piece to the other end of the one held by a string it would start to rotate in the opposite direction.

...... take off.....(complete)

Answer:

Building is 747.19 m tall

Explanation:

Given, t

Total velocity v = 123 m/s

Horizontal velocity or the X -component if velocity vx = 22 m/s

For a horizontal projectile motion  

V = Sqrt (vx^2 + g^2t^2)

Or t = sqrt{(v^2 – vx^2)/g^2} ---Eq (1)

Time of flight  

t = sqrt (2h/g) – Eq (2)

where h is the height

Equating, both the equation, we get –  

h = (123^2 – 22^2)/19.6 = 747.19 m

Answer:

voltage ,current and resistance

The answer to this is B, C, and D. hope this helped

Answer:

According to Newton's third law, throwing the apples in the opposite direction to the shore with a force, F₁, one after the other, repeatedly, pushes the both towards the shore with a force also equal to F₂ until the boat reaches the shore

Explanation:

The given parameters are;

The distance of the boat from the shore = 20 meters

The available propulsion devices = A box of apples

According to Newton's third law of motion states that action and reaction are equal and opposite

Therefore, according to Newton's third law, by throwing the apple into the  water in the opposite direction to the shore, such that each apple of mass m₁, is given an acceleration a₁, will result in a force, F₁ = m₁a₁ in the direction away from the shore

According to Newton's third law of motion, the force F₁, will result in an opposite reaction force F₂ in the direction of the shore, such that as F₁ is made large by giving a higher acceleration, a₁ the apples, reaction force on the occupant of the boat , who is throwing the apple, F₂, increases

F₁ = -F₂

Where;

F₂ = m₂·a₂

a₂ = The acceleration of the boat and the occupant

m₂ = The mass of the boat and the occupant

Given that the mass, m₂, is constant, the acceleration of the boat and occupant, a₂, increases as F₁ increases, increasing the speed of the boat from zero to positive value above zero m/s and the boat moves towards the shore

Answer: 3889 J

Explanation:

Given

Force applied [tex]F=250\ N[/tex]

the direction of application is [tex]\theta=45^{\circ}[/tex] above the horizontal

If he pushes the box 22 m

Work done is given by the dot product of force and displacement

[tex]\Rightarrow W=F\cdot s\\\Rightarrow W=250\times 22\times \cos 45^{\circ}\\\Rightarrow W=3889\ J\quad [\text{upto four significant figure}][/tex]

Hence, option (d) is correct.

Answer:

Acceleration is defined as the rate of change of velocity

Explanation:

Its A

Answer:

There are four natural states of matter: Solids , liquids, gases and plasma. The fifth state is the man-made Bose-Einstein condensates. In a solid, particles are packed tightly together, so they don't move much.

Explanation:

The correct answer to this open question is the following.

Unfortunately, you did not attach the article or the text. You also forgot to attach the options for the question.

However, trying to help you we did some deep research and can comment on the following.

The statement that describes the central idea of the text is "Baseball can be explained and improved by collecting data and studying the natural laws at play in the sport."

You are referring to the article written by Stephen Ornes, of August 21, 2013, for Science News for Students.

The author refers to the idea that baseball and physics are related and can be understood through the "eyes" of science. Statistics bring interesting data to help understand the game.

And this idea is correct because today, baseball coaches and other sports coaches as is the case of football, use a series of statistics and data to better hire talent for their respective teams, as well as to better create plans and game strategies derived from the results and interpretation of data.

Answer:

Modeling Earth’s Tilt

When watching the stars at night, they do appear to move very slowly. This is because the Earth is constantly moving. The Earth completes one “rotation” every twenty-four hours. A rotation is when the planet spins around once. The Earth rotates counterclockwise; this is why the Sun “rises” in the East and “sets” in the West. It is not the Sun’s movement that causes days, but rather the Earth turning around in front of the Sun. The Earth’s axis (the point at which it rotates around, for example, if you were to spin around while standing in one spot, your axis would be an imaginary line running through your head straight down to your feet) is in line with a star named “Polaris”. Polaris is also known as the “North Star” since it is directly above the Earth’s axis. Since this star is directly above the Earth’s axis, it does not appear to move, however, the rest of the stars in the sky move around Polaris (for example: when you spin around, the object directly above your head does not appear to move but everything else seems to spin around that object). Polaris is only seen in the Northern hemisphere and it belongs to the Little Dipper constellation (it’s the last star at the end of the “handle”). Another type of motion is known as “revolution”. Revolution is when one object completes a circular path around another object. The Earth takes 365.24 days to revolve around the Sun. This is why a year is 365 days long. During the year the Earth is angled differently towards the Sun. These changing angles provide us with different Sun intensities and therefore we get four different seasons. Since the Earth is at different positions in space over the year, we see different constellations throughout the year

Explanation:

:)

Factors That Affect Climate Project: Modeling Earth’s Tilt is explained below.

The rotation is the spinning around of an object about its own axis passing through the center.

When the Earth rotates about its own axis, the rotation completes in 24 hours. This causes the day to night and night to day. When the part of Earth is in front of Sun, there is day. But, when the same part of Earth goes away from the Sun, the sunset occurs and then eventually night occurs.

While watching the stars around evening time, they really do seem to move gradually. This is on the grounds that the Earth is continually moving. The Earth finishes one day in each 24 hours. A turn is the point at which the planet twirls around once. The Earth pivots counterclockwise. Not the Sun's development causes days, yet rather the Earth pivoting before the Sun.

The Earth's pivot is in accordance with a star named Polaris. Polaris is otherwise called the North Star since it is straight over the Earth's pivot. Since this star is straight over the Earth's pivot, it doesn't seem to move, nonetheless, the other stars overhead move around Polaris . Polaris is just found in the Northern half of the globe and it has a place with the Little Dipper heavenly body. One more sort of movement is known as "upheaval".

Upheaval is the point at which one item finishes a roundabout way around another item. The Earth requires 365.24 days to rotate around the Sun. To this end, a year is 365 days in length. During the year the Earth is calculated contrastingly towards the Sun. These changing points furnish us with various Sun forces and thusly we get four unique seasons. Since the Earth is at various situations in space over the course of the year, we see various groups of stars consistently.

Thus, the paragraph about how the climate affects the Earth and its tilt is explained above.

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Answer:

S = 26.58 meters

Explanation:

Given the following data;

Initial velocity = 4.66 m/s

Acceleration = 5.66 m/s²

Time = 2.35 seconds

To find the distance travelled by the object, we would use the second equation of motion;

S = ut + ½at²

Where;

S represents the displacement or height measured in meters.

u represents the initial velocity measured in meters per seconds.

t represents the time measured in seconds.

a represents acceleration measured in meters per seconds square.

Substituting into the equation, we have;

S = 4.66*2.35 + ½*5.66*2.35²

S = 10.951 + (2.83 * 5.5225)

S = 10.951 + 15.629

S = 26.58 meters