A/An _____ is described as a device that is used to measure potential difference across any part of a circuit.ammeterfuseground fault interruptervoltmeter

Given:

Mass, m = 0.68 kg

Initial temperature, T1 = 20°C

Final temperature, T2 = 45°C

Let's find the amount of heat needed.

Apply the Specific Heat Capacity formula:

Where:

m is the mass = 0.68 kg

c is the specific heat of water = 4.187 J/kg °C−1

T1 = 20°C

T2 = 45°C

Plug in the values and solve for Q:

Where:

1 kJ = 0.239 kCal

Since the answer is to be in kCal, we have:

Therefore, the amount if heat added is 17.01 kCal.

ANSWER:

17.01 kCal

Metals are good conductor of electricity while plastics are bad conductors of electricity.

Thus, the statement D Metals and plastic are poor conductors is false.

Hence the correct option is D.

In order to determine the depth in the ocean, use the following equation:

h: depth

P: pressure = 3*Po

Po: atmospheric pressure = 1.013*10^5Pa

g: gravitational acceleration constant = 9.8m/s^2

p: density of water = 1025 kg/m^3

Replace the previoua values into the formula for h and simplify:

Hence, the depth in the ocean is approximately 20.17m

Answer:

88 ft / sec = 60 mph

Thus 97/60 * 88 = 142 ft/sec      maximum speed of cannonball

R = V^2 sin 2 θ / g = 142^2 / 32 = 630 ft

Using 3.28 ft / m

630 ft / 3.28 f/m = 192 m is the maximum range of the cannonball

Vy = 142 ft / sec * sin 45 = 100 ft/sec    vertical speed at 45 deg

Tup = 100 ft/sec / 32 ft/sec^2 = 3.12 sec    time to reach height

T = 2 * 3.12 = 6.24      total time in air when fired at 45 deg

The pitch of a note is the same as its frequency.

Remember that te timbre depends on the shape and other properties of the vibrating object. The loudness is related to the amplitude of the wave, and the wavelength of sound is inversely proportional to the frequency.

On the other hand, the frequency of the sound of a string is proportional to the square root of the tension in the string. Then, if the tension increases (if the string is tightened), the frequency will also increase (and if the frequency increases, the wavelength decreases).

Therefore, the parameter that increases when a string of a stringed instrument is tightened, is the pitch.

Therefore, the answer is:

The maximum efficiency that a heat engine could have when operating between the normal boiling and freezing temperatures of water is 26.8 %

η = ( [tex]T_{H}[/tex] - [tex]T_{C}[/tex] ) / [tex]T_{H}[/tex] * 100

η = Efficiency

[tex]T_{H}[/tex] = Hottest temperature

[tex]T_{C}[/tex] = Coldest temperature

Hottest temperature = Boiling point

Coldest temperature = Freezing point

[tex]T_{H}[/tex] = 100 °C = 373 K

[tex]T_{C}[/tex] = 0 °C = 272 K

η = ( 373 - 273 ) / 373 * 100

η = 100 / 373 * 100

η = 26.8 %

In a heat engine, the heat energy is converted into mechanical energy which will be used to do mechanical work like pushing a piston out from the cylinder.

Therefore, the maximum efficiency that a heat engine could have when operating between the normal boiling and freezing temperatures of water is 26.8 %

To know more about maximum efficiency of a heat engine

https://brainly.com/question/25289326

#SPJ1

Given:

The currents, I₁=20 A

I₂=10 A

The length of the wires, L=5 m

The distance between two wires, d=1.0 cm=0.01 m

To find:

The magnetic force between the wires.

Explanation:

As the wires are conducting the current in opposite directions, the nature of the force between the wires is repulsive.

The magnitude of the force between two wires is given by,

Where μ₀=4π×10⁻⁷ H/m is the permeability of free space.

On substituting the known values,

Final answer:

The magnetic force between wires is 0.020 N, repulsive.

Given:

• Force, F = 25 N

• Radius, r = 2 cm

Let's find the pressure increase.

To find the pressure increase, apply the formula:

Where:

F = 25 N

r is the radius in meters = 2 cm

P is the pressure

Convert the radius from cm to meters.

Where:

100 cm = 1 m

2 cm = 2 /100 = 0.02 m

Hence, we have:

Therefore, the pressure increase is 1.99 x 10⁴ Pa.

ANSWER:

1.99 x 10⁴ Pa

ANSWER

75.65 km/h

EXPLANATION

Given:

• The student's mass, m = 77 kg

• The kinetic energy of the student in the car, KE = 1.7 x 10⁴ J

Find:

• The speed read in the speedometer of the car, which is the speed of the student, v (in km/h)

The kinetic energy of an object with mass m, traveling at a speed v, is,

Solving for v,

Replace the known values and solve,

Note that because the kinetic energy is given in Joules - which is equivalent to kg*m²/s², the speed we found is in m/s. Now, knowing that there are 3600 seconds in 1 hour and that 1 km is equivalent to 1000 m, we can convert this to km/s,

Hence, the speedometer reading of the car is 75.65 km/h, rounded to the nearest hundredth.

1. A ceiling fan plugged into the wall socket.

The input is the electrical energy and the output is the mechanical energy from the rotation of the fan blades.

So, the energy transfer must be electrical to mechanical.

2. A stove heating a pot of water for pasta

The input is the light energy from the stove and the output is the thermal energy to heat the water.

So, the energy transfer must be light to thermal.

3. A wind turbine generating power

The input is the mechanical energy from the rotation of the turbine blades and the output is the electrical energy that is being generated.

So, the energy transfer must be mechanical to electrical.

4. A person eats a snack when they are hungry and has the energy to take a walk.

The input is the chemical energy that the person gets from eating food and the output is the mechanical energy (doing physical work).

So, the energy transfer must be chemical to mechanical.

5. A solar panel is used to create power

The input is the light energy from the Sun and it is being converted into electrical energy to generate power.

So, the energy transfer must be light to electrical.

6. A microwave is used to heat up a burrito.

The input to the microwave is the electrical energy and the output is the thermal energy to heat up the burrito.

So, the energy transfer must be electrical to thermal.

7. A lamp is plugged into the wall and shines down on a room

The input to the lamp is electrical energy which is being converted into light energy.

So, the energy transfer must be electrical to light.

8. A plant grows by absorbing the sun's rays

The input to the plant is the nuclear energy from the sun and the output is the chemical energy.

So, the energy transfer must be nuclear to chemical.

9. A game controller uses batteries to power it.

The batteries provide chemical energy as input and the output is the electrical energy to power the controller.

So, the energy transfer must be chemical to electrical.

10. The sun heats up a person sunbathing at the beach.

The input is the nuclear energy from the sun and output is the thermal energy by absorbing the heat.

So, the energy transfer must be nuclear to thermal.

ANSWER

False

EXPLANATION

Sound waves travel by causing vibrations in particles in the direction of the wave and these vibrations can travel through any state of matter (solid, liquid, gas).

This means that if the vibrations occur faster, the sound waves can also be transmitted faster. On a warm day, the temperature is higher, which means that molecules of air vibrate faster, resulting in faster transmission of sound waves.

Therefore, it is false that sound travels faster on a cold day than on a warm day.

To find:

Which of the given statements is true.

Explanation:

The free fall is defined as the motion of an object under the influence of only gravitational force. In free fall, there will be no forces, except gravitational force acting on the object.

When the skydiver jumps, gravity will pull the diver downwards. And the air resistance due to the air in the atmosphere will oppose this motion of the diver. Thus there will be two forces acting on the diver, gravity and the air resistance. Thus the skydiver will never experience free fall.

Final answer:

Thus the correct answer is option D.

Well, we will hav that neither "k" or "x" are negative, the negative sign is external to both values and the reason is that this is written in that way to represent the "direction" of the movement of the system. Form example, when the spring is extended then it will represent that it will pull back, and when it is compacted it represents that it will pull outwards.

It is simply a technicallity.

Correct answer is option B.

Answer:

3:1

Explanation:

Answer:

The answer should be 450 cm³

Cannot be 4500 unless one of the measurements is in meters. See detailed explanation below

Explanation:

This is pretty much straightforward

V = l x w x h

where

l = length, w = width, h = height

Given the values for l, w, h

V = 4.5 x 2 x 50

= 450 cm³

The only way you can get 45,000 is if one of the measurements is in meters and others in cm. Please check your question carefully to see what units were used and what units the answer should be in

Geothermal energy can be used only if an energy source is present.

Mining is required to use geothermal energy.

The depth of mining increases earthquake risk.

Thus, it is difficult to find geothermal energy sources that are close to the surface.

Given:

Car A is traveling with a constant velocity of,

The initial speed of car B is,

After t=4 s, carB's speed is,

To find:

Which car has a greater acceleration

Explanation:

The acceleration of Car A is Zero as there is no change in velocity with time.

The acceleration of car B is,

So, Car B has greater acceleration.

Hence, Car B has greater acceleration.

The acceleration of the cart

a=1.2431m/s^2

Generally, The equation for Newton's second law of motion is

2nd law of motion,

Fnet=m a

on hanging mass,

m_1 g-T=m_1 a

m_1 g-m_2 a=m_1 a

Acceleration, [tex]$a=\frac{m_1 g}{m_1+m_2}$[/tex]

[tex]&a=\frac{0.077 \mathrm{~kg} \times 9.8 \mathrm{~m} / \mathrm{s}^2}{0.077 \mathrm{~kg}+0.53 \mathrm{~kg}} \\[/tex]

a=1.2431m/s^2

Read more about Acceleration

https://brainly.com/question/12550364

#SPJ1

The orbital time period of the Saturn is 29.6 years

We are given that,

Distance from Sun to Saturn is = a = 1.43 × 10¹²

The mass of the Sun is = M =1.99 × 10³⁰kg

The Gravitational constant = G = 6.67 × 10⁻¹¹N-m²kg⁻²

To find the orbital period of Saturn we can use the equation ,

[tex]T^{2} = \frac{4\pi }{GM}a^{3}[/tex]

Where, T is the orbital time period of the of the Saturn , M is the mass of the sun , G is the gravitational constant.

Therefore, after putting the value in above equation we can get,

[tex]T^{2} = \frac{4(\(3.14)^{2} }{(6.67*10)^{-11} )N-m^{2} kg^{-2}}(1.43*10^{12}) ^{3}m[/tex]

[tex]T^{2} = \sqrt{8.688*10^{17} } s[/tex]

[tex]T = 932094415.818s[/tex]

So that , from above to convert the orbital time period of Saturn from second into year i.e. above seconds divided by seconds (1 sec = 3.154 ×10⁷ Earth years)

Thus, the orbital time period can be ,

[tex]T = 29.6 years[/tex]

To know more about time period

https://brainly.com/question/3956637

#SPJ1

By equating the two forces, acceleration due to gravity g is obtained which is independent of mass

The law state that the rate of change of momentum is directly proportional to the force applied.

From Newton’s Second Law, Force F = mg. And from Newton’s Law of Universal Gravitation, Force F = GMm/r²

Where m is the mass of the satellite or the body revolving round the earth.

Equate the two forces.

mg = GMm/r²

The two m cancelled out leaving

g = GM/r²

Where

Therefore, since the mass of the satellite m has cancelled out, acceleration due to gravity g is independent of mass.

Learn more about Newton's Laws here: https://brainly.com/question/25998091

#SPJ1

Answer: h = 14 m

Explanation:

From the information given,

weight of rocket = 10N

Recall, weight = mg

Thus, mg = 10

where

m = mass of object

g = acceleration due to gravity and its values is 9.8 m/s^2

At the exact top of the trajectory, the total mechanical energy = 140 J

Recall,

total mechanical energy = kinetic energy + potential energy

At the exact top, kinetic energy = 0

Thus,

140 = potential energy

Recall, potential energy = mgh

where h is the height of the object(in this case, h is the height at the exact top and its value is 140J). Thus,

140 = mgh

Substituting mg = 10, we have

140 = 10h

h = 140/10

h = 14 m

Static energy is the energy due to motionless state of a particle. If a particle is at rest it possess static energy also known as potential energy. When some force is applied to the particle then the static energy gets converted into kinetic energy of the particle.

Given,

The current drawn by the contact lens heating unit, I=0.05 A

The supply voltage, V=197 V

The electric power is given by the product of the current drawn and the supply voltage.

Thus the power used by the given device is given by,

On substituting the known values,

Thus the power used by the contact lens heating unit is 9.85 W

Vi = initial speed = 10 km/h

Vf= final speed = 75 km/h

t = time = 7 sec

a = acceleration

First, express km/h in m/s

Vi = 2.78 m/s

Vf= 20.83 m/s

Apply

a = (vf-vi) / t

replace:

a = (20.83 - 2.78 ) / 7 = 2.58 m/s^2

The density is given by:

where V is the volume and m is the mass.

To determine the mass we have to solve the equation for m:

Now, before we can calculate the mass we have to convert the volume given to cubic meter, this comes from the fact that the density is given in g/cm^3 units. We have to remember that a ft is equal to 30.48 cm, then we have:

Hence the volume of the iceberg is:

Now that we have the volume in the correct units we plug its value and the density in the equation for the mass above:

Hence the mass of the iceber is 2.32x10^8 g.

Therefore the mass of the iceberg in kilograms is:

Answer:  45 A

Explanation:

Primary only protection 3-phase

I =  3 phase kVA / ( 1.723 * V)

I = 30000 / ( 1.732 * 480 ) = 36.085 A

Table 450.3(B)

Currents of 9A or more column

primary only protection  = 125%

Max OCPD pri = 125% of I = 1.25 * 36.085 = 45.11 A

 Table 450.3(B) Note 1   does not apply, use next smaller Table 240.6(A)

Next smaller = 45 A

Answer: D

Explanation:

Larger objects require greater amounts of force to move.

As he stacks books from the trolley on shelves, it gets easier to push or pull the trolley because the trolley gets lighter when the books are shifted from the trolley to the shelves. So, larger objects require greater amounts of force to move. Hence, option D is correct.

Inertia is a property of bodies that prevents them from moving or, if they are already moving, causes them to change the speed or direction of their motion. The inertia of a body is a passive quality that prohibits it from acting in any way besides opposing active agents like forces and torques.

A moving body continues to move not because of its inertia but rather because no force exists to stop it, alter its direction, or accelerate it.

According to the question, when there are books on the trolley they require a greater amount of force to move but when the books are shifted on the shelves it's easier to move the trolley. So inertia is proportional to mass.

To get more information about inertia :

https://brainly.com/question/3268780

#SPJ5

ANSWER:

STEP-BY-STEP EXPLANATION:

Given:

Mass (m) = 8.1 kg

T1 = 64 °F

T2 = 743 °F

Specific heat (C) = 385 J/kg*°C

The height of the well is 30m

We are given that ,

The initial velocity of the stone = u = 5m/s

The stone fall into well in time = t = 3s

The acceleration due to gravity = g = 10 m/s²

To get the height of the stone which is thrown from the surface of the water in the well by equation,

h = ut + 1/2 gt²

Where, u is initial velocity in m/s, h is height in m, t is time in secs, g is acceleration due to gravity which is vertically upward direction i.e. (-10m/s²)

h = (5m/s) (3s) + 1/2 (-10m/s²)(3s)²

h = (15m) - (5m/s²)(9s²)

h = -30 m

Therefore, the height of the stone which is thrown upward is 30 m . And here, we can neglect the negative sign due to height is never be in negative.

To know more about height

https://brainly.com/question/14289116

#SPJ1