Which of the following describe an electric motor?

The induced current will increase if we move the magnet twice as fast.

We know that an induced current is produced by a changing magnetic field. The greater the speed of the magnet, the greater the magnitude of the current so we can conclude that the induced current will increase if we move the magnet twice as fast.

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Answer:

The induced current will increase.

Explanation:

Answer:

how?

Explanation:

The use of energy for the purpose to boil water and warming the environment are the proper use of this lost energy.

The energy which is lost from the bulb is in the form of thermal energy. This thermal energy can be used to boil water or heating the surrounding environment so in this way the lost energy can be used properly.

So we can conclude that use of energy for the purpose to boil water and warming the environment are the proper use of this lost energy.

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Answer:

10 m

Yes, the car will be able to stop before it reaches the truck.

Explanation:

[tex]u=\text{Initial velocity of the car}=\dfrac{72}{3.6}=20\ \text{m/s}[/tex]

[tex]t=\text{Time}=0.5\ \text{s}[/tex]

[tex]s=\text{Displacement}[/tex]

From the laws of motion we have

[tex]s=ut+\dfrac{1}{2}at^2\\\Rightarrow s=20\times 0.5+0\\\Rightarrow s=10\ \text{m}[/tex]

The car will travel 10 m in 0.5 seconds

[tex]a=\text{Acceleration}=-2.5\ \text{m/s}^2[/tex]

[tex]v^2-u^2=2as\\\Rightarrow s=\dfrac{v^2-u^2}{2a}\\\Rightarrow s=\dfrac{0^2-20^2}{2\times -2.5}\\\Rightarrow s=80\ \text{m}[/tex]

Total distance required for the car to stop is 10+80 = 90 m. So, the car will be able to stop before it reaches the truck.

Answer: B

Explanation:

Due to the rubbing of the balloons on their hair, the balloons have gained negative charges which lie on the balloons surfaces. Like charges will repel each other according to the Coulomb force

the chemical formula for periodic acid is HI04

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Answer:

D

Explanation:

The correct answer would be option D.

Gallium (Ga) , germanium (Ge) , selenium (Se) , and arsenic (AS) all belong to the same group of elements referred to as the transition elements. The transition elements have partially-filled d orbital, a feature that confers some characteristic properties on the elements or their ions. These properties include:

Answer:

c.97.1j

Explanation:

yan po ang answer

Answer:

The function of a nerve cell, also called a nueron, is to transmit messages from the body to the brain and from the brain to the body.

Answer: A or B?

Explanation: its either those 2

Answer:

50 meters

Explanation:

50 meters

50 meters

Answer:

The 10-meter long rod of an SR-71 airplane expands 0.02 meters (2 centimeters) when plane flies at 3 times the speed of sound.

Explanation:

From Physics we get that expansion of the rod portion is found by this formula:

[tex]\Delta l = \alpha\cdot l_{o}\cdot (T_{f}-T_{o})[/tex] (Eq. 1)

Where:

[tex]\Delta l[/tex] - Expansion of the rod portion, measured in meters.

[tex]\alpha[/tex] - Linear coefficient of expansion for titanium, measured in [tex]\frac{1}{^{\circ}C}[/tex].

[tex]l_{o}[/tex] - Initial length of the rod portion, measured in meters.

[tex]T_{o}[/tex] - Initial temperature of the rod portion, measured in Celsius.

[tex]T_{f}[/tex] - Final temperature of the rod portion, measured in Celsius.

If we know that [tex]\alpha = 5\times 10^{-6}\,\frac{1}{^{\circ}C}[/tex], [tex]l_{o} = 10\,m[/tex], [tex]T_{o} = 0\,^{\circ}C[/tex] and [tex]T_{f} = 400\,^{\circ}C[/tex], the expansion experimented by the rod portion is:

[tex]\Delta l = \left(5\times 10^{-6}\,\frac{1}{^{\circ}C} \right)\cdot (10\,m)\cdot (400\,^{\circ}C-0\,^{\circ}C)[/tex]

[tex]\Delta l = 0.02\,m[/tex]

The 10-meter long rod of an SR-71 airplane expands 0.02 meters (2 centimeters) when plane flies at 3 times the speed of sound.

Answer:

14715J

Explanation:

Ep = mgh

given that ,

m = 150kg

h =10

g = 9.81 m/s^2

Ep = 150 × 10 × 9.81

Ep= 14715J

Answer:

entergy is measured by weight mass and height

Explanation:

Answer:

gases that are not good at absorbing long wave photons of infra red.

Explanation:

Option B is correct

Answer:

C) if they are based on a very small sample

Answer:

D

Explanation:

The three options are 1,3 and 5 Moving the balls closer together. The distance decreases and forces increase.

The gravitational force ia s type of force has the ability attracts any two objects with mass. Gravitational force tries to pull two masses towards each other.

The value of the gravitational force is given by;

[tex]F_g=\frac{ Gm_ 1m_2}{r^2}[/tex]

It is observed that the gravitational force is directly propotional to the product of mass and inversly propotional to the square of the distance between them.

So, the correct options are :

(1) Moving the balls closer together. The distance decreases and forces increase.

(3) Wrapping the soccer ball in layers of duct tape will also increase force because the mass will increase.

(5) Similarly, putting the baseball in a plastic case will increase mass, and hence force increases.

Hence the three options are 1,3 and 5.

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Answer:

The acceleration of textbook is downward at the slowest rate.

(a) is correct option.

Explanation:

Given that,

The object is accelerating downward at the slowest rate.

(a). a textbook falling onto the surface of the moon

(b). a flower pot that has been pushed out a window

(c). a pebble falling off a cliff through the air

(d). a baseball thrown from third base to first base

We know that,

Acceleration :

Acceleration is the product of mass of object and gravity.

[tex]a=mg[/tex]

We need to find the accelerating downward at the slowest rate

According to given data,

Acceleration depends upon weight and gravity.

We have some example of free fall.

(b), (c) and (d) are the example of free fall.

In which the gravity is same.

But in option (a) textbook falling onto the surface of the moon

We know that,

The gravity on the moon is less than the earth.

So, we can say that the acceleration of textbook is downward at the slowest rate.

Hence, The acceleration of textbook is downward at the slowest rate.

(a) is correct option.

Answer:

Summary of Photorealism

The name Photorealism (also known as Hyperrealism or Superrealism) was coined in reference to those artists whose work depended heavily on photographs, which they often projected onto canvas allowing images to be replicated with precision and accuracy. The exactness was often aided further by the use of an airbrush, which was originally designed to retouch photographs. The movement came about within the same period and context as Conceptual art, Pop art, and Minimalism and expressed a strong interest in realism in art, over that of idealism and abstraction. Among several male practitioners of Photorealism there is an interest in themes of machinery and objects of industry such as trucks, motorcycles, cars, and even gumball machines, whereas Audrey Flack, the sole female practitioner, infuses her works with greater emotionality and the transience of life. Ultimately, the Photorealists were successful in attracting a wide audience, but they are often overlooked by art historians as an important avant-garde style.

Key Ideas & Accomplishments

Explanation:

Voltage = current x resistance

Voltage = 40 x 20 = 800 volts

Answer:

800v

Explanation:

v=IR

where V =Voltage,

I= Current

R= Resistance

V= 40x20

800v

The given length of the inclined plane of 1.6 m. inclined at 30° to the horizontal, and point mass velocity of 5 m/s gives;

Length of the inclined plane = 1.6 m

Angle of inclination of the plane = 30°

Speed of the point mass = 5 m/s

1. Height of the top of P above ground, h is found as follows;

h = 1.6 m × sin(30°) = 0.8 m

The equation of motion that can be used is; h = u•t - 0.5•g•t^2

Which gives;

0.8 = 5•t - 0.5×9.81×t^2

0 = 5•t - 4.905×t^2 - 0.8

t = 0.199, or t = 0.821

2. At the top, we have;

Horizontal velocity, vx = 0.5 × cos(30°)

Which gives;

Horizontal velocity, vx = 0.433 m/s

The distance traveled, x is found as follows;

= 0.433 m/s × 0.199 s = 0.086 m

3. The position of point C is therefore;

C(0.086 + 1.6 × cos(30°), 0)

C(1.472, 0)

Therefore;

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Answer:

Reflected

Explanation:

During the process of reflection whatever that is sent forth e.g light comes back (reflects)

Answer:

transmitted

Explanation:

took quiz

Answer:

Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data rates) than wire cables.

Explanation:

Answer:

Explanation:

We are going to use the newtons law of motion (first law) to solve this problem

where F is the force in Newton

m is the mass in kg and

a is the acceleration in m/s^2

given data

mass of the toy m= 1kg

force with which the toy is thrown = 20N

susbtituting we have

20=1*a

a= 20m/s^2

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

From the question

mass = 2.4 g

volume = 6 cm³

We have

[tex]density = \frac{2.4}{6} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

Yellow

Explanation:

So while red, green and blue light shine upon the shirt, only red and green light will reflect from it. Red and green light striking your eye always gives the appearance of yellow; for this reason, the shirt will appear yellow.