The power of an engine is a measure of
A) the total amount of work it can perform.
B) the rate at which it can perform work.
C) its ability to outperform a horse.
D) its volume.

Answer:

The speed of the block before it strikes the floor is 0.217 m/s.

Explanation:

Given;

mass of the block, m = 1.5 kg

height above the ground through the block was released, h = 2.4 mm = 2.4 x 10⁻³ m

The speed of the block before it strikes the floor will be maximum.

Let the speed of the block before it strikes the floor = v

Apply the principle of conservation of mechanical energy to determine the speed of the block.

K.E = P.E

¹/₂mv² = mgh

¹/₂v² = gh

v² = 2gh

v = √2gh

v = √(2 x 9.8 x 2.4 x 10⁻³)

v = 0.217 m/s

Therefore, the speed of the block before it strikes the floor is 0.217 m/s.

Answer:

2) τ = F x  torque increases, 3) troque decreases,

4)  man approaches the pivot and the child must move away

5)  Σ τ = 0

Explanation:

2) when the man moves away from the pivot his torque increases significantly, since his distance increases

                 τ = F x

                 τ = m g x

therefore the system rotates faster

3) when the child approaches the pivot, his troque decreases, because the distance decreases

                 τ = f x

therefore the system must spin slower

4) If we place the man and the child on the side of a scale, the movement must be the man approaches the pivot and the child must move away, so that the torque is the same and the system can reach a balance

5) the rotational equilibrium expression

                 Σ τ = 0

is the one that describes the equilibrium of a system with several forces

Following are the solution to the given points:

For question 2:

           [tex]\to W_2\times d_2=80\times 5=300\ units[/tex]

For question 3:

             [tex]\to W_1\times d_1=30\times 6=180 \ units[/tex]

For questions 4 and 5:

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Answer:

b

Explanation:

the more heat the hotel it get which cause more heat

Answer: C. Entropy

Explanation: a pex :)

When a liquid is boiling that means it has gotten heated to the point where the oxygen particles start rising towards the top of the liquid.

When a liquid has a temperature (as it always will) it can be read, however, a liquid does not need to be hot to have a temperature.

A liquid requires an extremely high level of heat (thermal energy) to begin boiling, while a liquid doesn't require any heat to have a temperature.

The difference between the two is that boiling requires high heat and a temperature doesn't require heat (That is 3 total the ones above count).

Hope this helps and have a nice day.

-R3TR0 Z3R0

The light intensity from  largest to smallest ranking will be  :

B > D > A=C > E

In physics, the intensity  is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy

equation to find intensity is I = P/ 4π(d^2)

where P = Power

           I = intensity

           d = distance where the intensity need to be found

let power of 1 bulb be = P

case A = I =  P / (1)^2 = P / 1 =P

case B = I = 2P/ (0.5)^2 =  8P

case C = I = 4P / (2)^2 =  P

case D = I = 3P / (1)^2 = 3P

case E = I = 2P /(1.5)^2 = 0.8 P

The light intensity from  largest to smallest ranking will be  :

B > D > A=C > E

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Answer:

Resistance = 0.22 Ohms

Current = 13.63636 A

Explanation:

Total resistance for resistors in parallel is given by:

[tex]\frac{1}{T} =\frac{1}{R1} +\frac{1}{R2} +...+\frac{1}{Rn}[/tex] where n is the number of resistors

[tex]\frac{1}{T} = \frac{1}{1.1} +\frac{1}{1.1} +\frac{1}{1.1} +\frac{1}{1.1} +\frac{1}{1.1}[/tex]

if you solve that you get [tex]\frac{1}{T} = 5/1.1 \\\\T = 1.1/5T = 0.22 Ohms[/tex]

Solve current using V=IR

I=V/R =

I=3/0.22

I = 13.63636 A

Answer:i

Explanation:∩

Answer:

This is Tungsten .

Explanation:

Electrical field E = V / l , V is potential diff and l is length

.005 = V / .01

V = .005 X .01 = 5 X 10⁻³ volts

I current = 9A

Resistance R = V / I

= 5 x 10⁻³ / 9

= 5.55 x 10⁻⁶ ohm .

To calculate resistivity :

R = ρ l / S , l is length , S is cross sectional area

5.55 x 10⁻⁶ = ρ x .01  / .01 x .01

ρ = 5.5 x 10⁻⁸

This is Tungsten .

Answer:

B. 10 s

Explanation:

Given the following data;

Power = 100 Watts

Energy = 1000 Joules

To find the time;

Power can be defined as the energy required to do work per unit time.

Mathematically, it is given by the formula;

[tex] Power = \frac {Energy}{time} [/tex]

Making time the subject of formula, we have;

[tex] Time = \frac {Energy}{Power} [/tex]

Substituting into the formula, we have;

[tex] Time = \frac {1000}{100} [/tex]

Time = 10 seconds

Answer:  Work = change in energy which can be calculated by force * displacement so taking this we can multiply 350n by *2m and we can come out with 700 joules

Explanation: I Hope This Helps I'm new at this.

Answer:

a. The length of the solenoid wire is approximately 131.95 m

b. The inductance of the solenoid is approximately 2.078 × 10⁻³ H

c. The length of the solenoid is 0.84  m

d. The current after three time constants have elapsed is approximately 456.1 A

Explanation:

The given parameters are;

The number of turns in the solenoid, N = 4,200 turns

The diameter of the wire, d = 0.200 mm

The diameter of the solenoid, D = 1.00 cm

The voltage of the battery connected to the solenoid, V = 12.0 V

The current increase = 155 mA

The time for the increase = 1.50 millisecond

The internal resistance of the battery is negligible

a. The length of wire needed to form the solenoid, l = π·D·N

∴ l = π × 0.01 × 4,200 ≈ 131.95

The length of the solenoid, l ≈ 131.95 m

b. The inductance, 'L', of the solenoid is given as follows;

[tex]L = \dfrac{\mu_0 \cdot N^2 \cdot A}{l}[/tex]

Where;

μ₀ = 12.6 × 10⁻⁷ H/m

N² = 4,200²

A = The cross sectional area of the solenoid = π·D²/4

l = Length of the solenoid = d × N = 0.0002 m × 4,200 = 0.84  m

∴ L = (12.6 × 10⁻⁷ × 4,200² × 0.01² × π/4)/0.84 ≈ 0.002078 = 2.078 × 10⁻³

The inductance, L ≈ 2.078 × 10⁻³ H

c.) The length of the solenoid = d × N = 0.0002 m × 4,200 = 0.84  m

The length of the solenoid = 0.84  m

d. The current after three time constant

 We have;

∈ = -L × di/dt

di/dt = 155 mA/1.5 ms = 103.[tex]\overline 3[/tex] A/s

∈ = 103.[tex]\overline 3[/tex] A/s × 2.078 × 10⁻³ H = 0.21472[tex]\overline 6[/tex] V

We have;

[tex]\tau = \dfrac{t}{\left(ln\dfrac{1}{1-\dfrac{Change}{Final-Start} } \right)}[/tex]

The change in voltage = 0.21472[tex]\overline 6[/tex] V

The start voltage = 0 V

The final voltage = 12.0 V

t = 1.5 ms = 0.0015 s

We get;

[tex]\tau = \dfrac{0.0015}{\left(ln\dfrac{1}{1-\dfrac{0.21472\overline 6}{12-0} } \right)} \approx 8.3076\times 10^{-2}[/tex]

τ = L/R

Therefore,

R = L/τ =

The resistance = 2.078 × 10⁻³/(8.3076×10⁻²) = 0.0250

The resistance = 0.0250 Ω

[tex]I= \dfrac{V}{R} \cdot \left(1 - e^{-\dfrac{t}{\tau} }\right)[/tex]

Therefore, after three time constants, we have;

∴ I = (12.0/(0.0250)) × (1 - e⁻³) ≈ 456.1

The current after three time constants have elapsed, I ≈ 456.1 A.

Answer:

[tex]\pi 1 = \frac{h}{l}[/tex]

[tex]\pi 2 =[/tex] б / [tex]l^2gp[/tex]

[tex]\frac{h}{l} =[/tex] Ф ( б / [tex]l^2gp[/tex] )

Explanation:

Develop a suitable set of dimensionless parameters for this problem

The set of dimensionless parameters for this problem is :

[tex]\pi 1 = \frac{h}{l}[/tex]

[tex]\pi 2 =[/tex] б / [tex]l^2gp[/tex]

[tex]\frac{h}{l} =[/tex] Ф ( б / [tex]l^2gp[/tex] )

and they are using the pi theorem, MLT systems

attached below is a detailed solution

The moon orbits Earth due to a gravitational field. This  observations provides the best evidence for the claim that gravity acts between objects across a distance.

According to Newton's Law of Universal Gravitation, every particle in the cosmos is drawn to every other particle with a force that is directly proportional to the product of their masses and inversely proportional to their distance from one another.

The moon orbits Earth due to a gravitational field of the earth. Gravity, an attraction force that acts on all objects, keeps the Moon in its orbit. Satellites can orbit a body and fall around it rather than into it if the speed and gravity are just right. Hence, option (B) is correct.

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Explanation:

Elastic collision between balls of equal mass viimis 1.5 mys 1.5m/s 1! mis ... Make a data table for the following: mass, velocity and momentum of each ball before ... Part 2 moving faster. ... Summary: Describe the main ideas learned in this activity regarding initial and ... Collision 2: Blue Cart Moving Slower than the Red Cart.

Answer:

B = 423.64 N

Explanation:

The thrust force in a fluid is equal to the weight of the displaced fluid,

         B = ρ g V

where the density is that of air ρ=1.29 kg / m³ and the volume of the spherical balloon is

          V = [tex]\frac{4}{3} \pi r^3[/tex]

          v = 4/3 π 2³

          V = 33.51 m³

let's calculate the thrust

          B = 1.29  9.8  33.51

          B = 423.64 N

When the electron is moved toward the positive plate, the electrostatic force increases causing the electron to be attracted to the positive plate.

The electrostatic force is the force tat acts between two charges. The nature of this force is described by the Coulumb law.

When the electron is moved toward the positive plate, the electrostatic force increases causing the electron to be attracted to the positive plate.

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Answer: reduce anxiety, depression, and  negative mood and by improving self-esteem and cognitive function.

Explanation:

Answer:

Temperature increases

During the phase transition from liquid to solid, kinetic energy diminishes, particles move slower, and freezing occurs.

Extreme heat is more likely to occur as a result of rising temperatures, and it will last longer. Heatwaves can indeed be deadly, resulting in manifestations including heat kinks and heat exhaustion, as well as death.

Since in changement from liquid to solid the temperature will decrease.Therefore, the final answer is "Temperature increases".

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Answer:

B. Northern Canada

Explanation:

A continental polar air mass can form over the land during the winter months. In the Northern Hemisphere, it originates in northern Canada or Alaska. As it moves southward, it brings dry weather conditions to the United States. Temperature and humidity levels are both low. Hope this helps :)

Answer:

The pressure at this depth is [tex]1.235\cdot P_{atm}[/tex].

Explanation:

According to the statement, the uncompressed fluid stands at atmospheric pressure. By Boyle's Law we have the following expression:

[tex]\frac{P_{2}}{P_{1}} = \frac{V_{1}}{V_{2}}[/tex] (1)

Where:

[tex]V_{1}, V_{2}[/tex] - Initial and final volume.

[tex]P_{1}, P_{2}[/tex] - Initial and final pressure.

If we know that [tex]V_{2} = 0.81\cdot V_{1}[/tex], then the pressure ratio is:

[tex]\frac{P_{2}}{P_{1}} = 1.235[/tex]

If [tex]P_{1} = P_{atm}[/tex], then the final pressure of the gas is:

[tex]P_{2} = 1.235\cdot P_{atm}[/tex]

The pressure at this depth is [tex]1.235\cdot P_{atm}[/tex].

The pressure of the fluid at this depth will be "1.16 [tex]P_{atm}[/tex]".

According to the question,

Let,

The volume of surface be "100 units".

then,

The volume of depth be:

= 100 - 14

= 86 units

We know the relation,

P ∝ [tex]\frac{1}{V}[/tex]

here, PV = Constant

By using Boyle's law,

→ P₁ V₁ = P₂ V₂

or,

→     P₂ = [tex]\frac{P_1 V_1}{V_2}[/tex]

By substituting the values, we get

           = [tex]\frac{P_{atm}\times 100}{86}[/tex]

           = 1.16 [tex]P_{atm}[/tex]

Thus the above answer is appropriate.

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Answer:

I don't know but you got this!!

Explanation:

work done =force *distance

work done =17000*26

work done=442,000 joules.

Answer:

b

Explanation:

Bar magnets have two magnetic poles

Answer:

because it affects the attom in living things

Answer:

[tex]220833.33\ \text{m/s}[/tex]

Explanation:

[tex]E[/tex] = Electric field = [tex]106\ \text{kV/m}[/tex]

[tex]B[/tex] = Magnetic field = [tex]0.48\ \text{T}[/tex]

Velocity is given by

[tex]v=\dfrac{E}{B}[/tex]

[tex]\Rightarrow v=\dfrac{106\times 10^3}{0.48}[/tex]

[tex]\Rightarrow v=220833.33\ \text{m/s}[/tex]

The velocity of the particle is [tex]220833.33\ \text{m/s}[/tex].