a box is at rest on a ground. An unbalance force acts on the box causes it to start. The box moves 10 meters in 2 seconds and then stop. why did the box moving? what is the box's average speed?

Answer:

  c.  1.4×10^5 N

Explanation:

Work is the product of power and time. It is also the product of force and distance. We can equate these two products to find the distance.

__

  Wt = Fd

  (7.0×10^4 N·m/s)(40 s) = F(20 m)

  F = (7.0×10^4)(40/20) N = 1.4×10^5 N

The force exerted by the motor is 1.4×10^5 newtons.

Answer:

Then our fires would become massive.

Explanation:

Hope this helps

Compass and metal detector are the practical applications of magnetism.

Using a compass to find your way to a campsite and a metal detector to find buried iron objects are the practical applications of magnetism because in these tools magnet is used. Without magnet, they can't perform their function.

So we can conclude that compass and metal detector are the practical applications of magnetism.

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Since no data table was provided, the wave speed be calculated by taking the mean of speed values.

Also, the mathematically derived speed of sound is 343 m/s at 20 °C.

Sound is an example of a mechanical wave and require a material medium for it's transmission.

The speed of sound in air has been determined to be about 343 m/s at 20 °C.

The average wave speed can be calculated using the formula:

The formula relating speed of a wave, frequency, and wavelength is given below:

It is important to note that in this question, no data table or video was provided.

Therefore, the wave speed be calculated by taking the mean of speed values obtained in the experiment as shown in the video.

Also, the mathematically derived speed of sound is 343 m/s at 20 °C.

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Answer:

0

Explanation:

The displacement is zero since it goes in a full circle and ends up where it started.

Answer:

1.8kJ

Explanation:

Formula :

Energy used = Power x time

===============================================================

Given :

⇒ Power = 30 W

⇒ Time = 1 minute = 60 seconds

=============================================================

Solving :

⇒ Energy used = 30 W × 60 s

⇒ Energy used = 1,800 J

⇒ Energy used = 1.8kJ

Answer:

1800 joule (1.8kJ)

Explanation:

Formula:

Power = Work / Time

30 = Work / 60

Work = 1800 joule

Work = 1.8kJ

Energy = Work done = 1.8kJ

Hence, Energy used is 1.8kJ.

Considering the definition of speed, the speed of Sam is 3.6 [tex]\frac{km}{h}[/tex].

Speed ​​is a quantity that expresses the relationship between the space traveled by an object. That is, the speed is associated with the change of position of an object in space within a certain amount of time.

The speed can be calculated using the expression:

[tex]speed= \frac{displacement}{time}[/tex]

In this case, you know:

Replacing in the definition of speed:

[tex]speed= \frac{9 km}{2.5 h}[/tex]

Solving:

speed= 3.6 [tex]\frac{km}{h}[/tex]

Finally, the speed of Sam is 3.6 [tex]\frac{km}{h}[/tex].

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An arrow which shows the direction that the probe should be moving in order for it to enter the orbit is X.

An orbit can be defined as the curved path through which a astronomical (celestial) object such as planet Earth, in space move around a Moon, Sun, planet or star.

In this scenario, if the scientists want the probe to enter the orbit they should ensure that probe moves in direction X. This ultimately implies that, the probe must move in the same direction as the orbit, in order to enter it.

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Answer:

(b)

Explanation:

X

Answer:

inertia

Explanation:

the resistance of an object to moving or to stopping

a. gravity

b. inertia

c. gravitational force

A bicyclist moving at a constant speed takes 10.0 seconds to travel 500 meters down a path inclined 30.0° downward from the horizontal. the vertical velocity of this motion is mathematically given as

V' = 25 m/s. Option C.

Generally, the equation for the Inclined Component is mathematically given as

V=d/s

Therefore

V = 500/10

V= 50 m/s

In conclusion, for the vertical Component

[tex]V'= dsin \theta[/tex]

V'= 50Sin30

V' = 25 m/s

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The two objects perform the same task of measuring time and they are hourglass and sundial.

An hourglass is a device used to measure the passage of time.

The hourglass contains two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance from the upper bulb to the lower one.

A sundial is a horological device that is used to measure time of the day when there is sunlight by the apparent position of the Sun in the sky. Unlike hourglass, its doesn't move.

Thus, the two objects perform the same task of measuring time and they are hourglass and sundial.

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The work done to stretch the spring will be 112 J.

The force required to extend or compress a spring by some distance scales linearly with respect to that distance is known as the spring force. Its formula is

F = kx

The given data in the problem is;

F is the spring force =?

K is the spring constant= 8.5 N/m

x is the length by which spring got stretched = 1.2m

The work is done to stretch the spring is;

[tex]\rm W= \frac{1}{2} kx^2 \\\\ W=\frac{1}{2} \times 350 \times (0.850-0.050)^2 \\\\ W=0.5 \times 350 \times (0.80)^2 \\\\W=112 \ J[/tex]

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The energy that was lost due to air resistance while she was bouncing is determined as 3,360 J.

The amount of energy lost due to  air resistance while she was bouncing is determined from the principle of conservation of energy.

ΔE = P.E - Ux

ΔE = mgh - ¹/₂kx²

ΔE = (50)(9.8)(16) - ¹/₂(35)(16)²

ΔE = 3,360 J

Thus, the energy that was lost due to air resistance while she was bouncing is determined as 3,360 J.

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Explanation:

accurate quantitative expression, precise predictions and/or rigorous methods of testing hypotheses involving quantifiable predictions and measurements.

Answer:

because it is capable of accurate quantitative expression, meaning they show an absolute precision in their results.

Answer:

A circuit which has a battery in it will not allow electricity to flow through it. A device called a switch can be used to complete a circuit so that other devices can be switched on or off.

Explanation:

^^^

Decreasing the mass of the car will help increase the acceleration of the car using application of Newton’s laws of motion.

This law discusses the relationship between motion of a substance and the forces acting on it.

Heavy objects are more difficult to move which is why decrease in mass will help increase the acceleration.

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Answer: decreasing the mass of the car

Explanation: this is for a TLDR trust

The object D is made up of material Lead. The correct option is D.

The specific heat is the amount of heat required to change the temperature by 1°C. It is denoted by C.

Two 1-kg objects, C and D, increase in temperature by the same amount, but the thermal energy transfer of object C is greater than the thermal energy transfer of object D. The object C has a specific heat of 235 J/kg-K.

Q = m C ΔT

Qc > Qd

The energy transfer is proportional to specific heat.

Specific heat of D must be less. The possible material with specific heat less than the given value is for Lead material.

Thus, the correct option is D.

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The common work styles do Postal Service Mail Carriers need creativity, integrity, self-control and attention to detail.

They commonly sort mail and orchestrate it arranged by their conveyance course. They convey the mail by walking or any vehicle. They also gather mail and convey it to the post office. Mail transporters answer clients inquiries, provide forms, and look out for surprising conditions on their course.

Thus, the common workstyles they should need to have are creativity, integrity, self-control and attention to detail.

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Answer:

1456

Explanation:

The air mass would produce cold, dry weather in the winter is continental polar. The correct option is a.

A huge collection of air with evenly uniform degrees of temperature, humidity, and pressure.

Continental air masses which are formed cold and dry. Air mass that forms over northern Canada is known as continental polar air mass. As it moves to South, it brings dry weather like conditions in the United States.

Thus, the correct option is a.

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The velocity time graph is used to plot the velocity of a body against the time.  

The velocity time graph is used to plot the velocity of a body against the time.  The slope of this graph is called the velocity.

Now the following are true regarding the scenarios below;

Graph is parallel to the time axis - This is constant velocity

Graph is a straight line passing through the origin and having a constant slope. - There is a uniform acceleration.

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Answer:

40 V

Explanation:

 I will assume that  the resistors are

           100 and 3900 and 1000 OHMS    <=====(NOT W)

In series , the resistances add together 100 + 3900 + 1000 = 5000 ohms total

V = IR

I = V / R      so the total current will be   200 v / 5000 ohms = .04 amps

                   this is the current through all of the resistors

      so for the   1000 ohm resistor     V = IR     .04 (1000) = 40 V

The force of the person is 90 newtons away from the wall.

Force can be defined as the product of mass and acceleration.

To calculate the force of the person when pushing off the wall, use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the force of the person is 90 newtons away from the wall.

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The weight of the baseball is 1.47 N.

Weight is the gravitational pool of a body or an object.

To calculate the weight of the body, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the weight of the baseball is 1.47 N.

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Answer:

true

Explanation:

Light Years are the longest unit-distance. Our galaxy is numerous light years across.

Answer:

0.04 °C⁻¹

Explanation:

First, we need to calculate linear expansivity, then after finding that value, we can move on to finding the area expansivity.

=============================================================

Finding Linear Expansivity :

⇒ α = Final length - Original length / (Original length × ΔT)

⇒ α = 9 - 4 / (4 × 70 - 20)

⇒ α = 5 / 5 × 50

⇒ α = 0.02

============================================================

Finding Area Expansivity :

⇒ Area Expansivity = 2 × Linear Expansivity

⇒ β = 2 × α

⇒ β = 2 × 0.02

⇒ β = 0.04 °C⁻¹

Calculate the value of the area expansion of a steel rod of lenght 4cm at 20°c after heating attains another length of 9cm at 70°c.

Area = 0.02

Area Expansity = [tex]0.0 {4}^{ - 1} [/tex]

Answer:

Explanation:

It apply on how you will protect the egg because you protect the egg at all cost. It's very similar on who is protecting you, You need someone to be there for you always because an egg can't survive on it's own. Just like your life your can't be always rolling around like an egg you need to be safe and always with the person who cares for you. An egg is safe when they are together in a tray just like family and friends.

Answer:

It carries and stores sperm cells that are created in the testes.

Taking into account the definition of wavelength, frecuency and propagation speed, the wavelength for radio waves with a frequency of 100 MHz is 3 m.

First of all, wavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).

On the other side, frequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).

Finally, the propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave disturbance propagates along its displacement.

The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:

v = f×λ

All electromagnetic waves propagate in a vacuum at a constant speed of 3×10⁸ m/s, the speed of light.

In this case, you know:

Replacing in the definition of propagation speed:

3×10⁸ m/s = 100,000,000 Hz× λ

Solving:

λ= 3×10⁸ m/s ÷ 100,000,000 Hz

λ= 3 m

In summary, the wavelength for radio waves with a frequency of 100 MHz is 3 m.

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The statement is true, when the switch is closed electrons will flow.

Current can be defined as the rate of flow of charges or electrons in a given circuit.

Q = It

I = Q/t

where

A closed circuit is a type of circuit in which the wire connection of the circuit is complete and in which current flows.

Switch can be used close or open a circuit.

Thus, the statement is true, when the switch is closed electrons will flow.

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The total electric field of the rod at a distance, x to the right hand end of the rod is determined as [tex]E = \frac{\lambda}{4\pi \varepsilon _0} [\frac{1}{x} - \frac{1}{x+ l} ][/tex].

An expression for the electric field due to an arbitrary source location at observation location on the x-axis is determined as follows;

E = kq/r²

where;

[tex]\int\limits {dE} \,=\int\limits {\frac{kdQ}{r^2} }\\\\E = \lambda k \int\limits^{x + l}_x {\frac{dr}{r^2}} \,= \lambda k [-\frac{1}{r} ] \\\\E = \lambda k [\frac{1}{x} - \frac{1}{x+ l} ]\\\\E = \frac{\lambda}{4\pi \varepsilon _0} [\frac{1}{x} - \frac{1}{x+ l} ][/tex]

Thus, the total electric field of the rod at a distance, x to the right hand end of the rod is determined as [tex]E = \frac{\lambda}{4\pi \varepsilon _0} [\frac{1}{x} - \frac{1}{x+ l} ][/tex].

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