A bowl of 426 g of water is placed ina microwave oven that puts out 700 watts (J/s). How long would it take in seconds to increase the temperature of the water from 12.0°C to 45.7°C

Answer:

they are machined with shape characteristics which maximize the fatigue life of a metal.

Explanation:

they are highly polished to provide the surface characteristics which enable the best fatigue life.

Let's calculate the values based on the given information:

The area of the wooden block can be calculated by multiplying the length and width of one of its faces:

Area = Length * Width

Area = 40 cm * 20 cm

Area = 800 cm²

To convert to square inches, we can use the conversion factor 1 inch = 2.54 cm:

Area in square inches = Area in square centimeters / (2.54 cm/inch)²

Area in square inches = 800 cm² / (2.54 cm/inch)²

Area in square inches ≈ 124.03 in²

The volume of the wooden block can be calculated by multiplying its length, width, and height:

Volume = Length * Width * Height

Volume = 40 cm * 20 cm * 10 cm

Volume = 8000 cm³

To convert to cubic inches, we can use the conversion factor 1 inch = 2.54 cm:

Volume in cubic inches = Volume in cubic centimeters / (2.54 cm/inch)³

Volume in cubic inches = 8000 cm³ / (2.54 cm/inch)³

Volume in cubic inches ≈ 488.19 in³

The density of the wooden block can be calculated by dividing its mass by its volume:

Density = Mass / Volume

Density = 5 kg / 8000 cm³

To convert to grams per cubic centimeter (g/cm³), we can use the conversion factor 1 kg = 1000 g:

Density in g/cm³ = Density in kg/cm³ * 1000 g/kg

Density in g/cm³ = (5 kg / 8000 cm³) * 1000 g/kg

Density in g/cm³ ≈ 0.625 g/cm³

To convert to pounds per cubic inch (lb/in³), we can use the conversion factor 1 kg = 2.20462 lb and 1 inch = 2.54 cm:

Density in lb/in³ = Density in kg/cm³ * (2.20462 lb/kg) / (2.54 cm/inch)³

Density in lb/in³ = (5 kg / 8000 cm³) * (2.20462 lb/kg) / (2.54 cm/inch)³

Density in lb/in³ ≈ 0.036 lb/in³

Pressure is defined as force divided by area. In this case, we need more information to calculate the pressure. If the block is subjected to a specific force, we can divide that force by the appropriate surface area to find the pressure.

The pressure on the top surface of the wooden block depends on the force applied to it. Without information about the applied force, we cannot calculate the pressure.

Similarly, the pressure on the bottom surface of the wooden block depends on the force applied to it. Without information about the applied force, we cannot calculate the pressure.

The force on the top surface of the wooden block depends on the pressure applied and the surface area. Without information about the pressure or force applied, we cannot calculate the force.

The force on the bottom surface of the wooden block depends on the pressure applied and the surface area. Without information about the pressure or force applied, we cannot calculate the force.

Without the values for forces on the top and bottom surfaces, we cannot determine the difference between them.

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1. The area of the wooden block can be calculated using the formula for the surface area of a rectangular prism: SA = 2(lw + lh + wh), where l, w, and h are the length, width, and height of the block, respectively. Using the given dimensions, we can find the surface area in cm²:

SA = 2(40 × 20 + 40 × 10 + 20 × 10)

SA = 2(800 + 400 + 200)

SA = 2(1400)

SA = 2800 cm²

To convert cm² to in², we can use the conversion factor 1 in² = 6.45 cm². So, the area in in² is:

2800 ÷ 6.45 = 434.96 in² (rounded to two decimal places)

2. The volume of the wooden block can be calculated using the formula for the volume of a rectangular prism: V = lwh. Using the given dimensions, we can find the volume in cm³:

V = 40 × 20 × 10

V = 8000 cm³

To convert cm³ to in³, we can use the conversion factor 1 in³ = 16.39 cm³. So, the volume in in³ is:

8000 ÷ 16.39 = 487.61 in³ (rounded to two decimal places)

3. The density of the wooden block can be calculated using the formula: density = mass/volume. The mass of the block is given as 5 kg. To convert this to grams, we can use the conversion factor 1 kg = 1000 g. So, the mass in grams is:

5 kg × 1000 g/kg = 5000 g

Using the volume calculated in part 2, we can find the density in g/cm³:

density = 5000 g/8000 cm³

density = 0.625 g/cm³

To convert g/cm³ to lb/in³, we can use the conversion factor 1 g/cm³ = 0.0361 lb/in³. So, the density in lb/in³ is:

0.625 g/cm³ × 0.0361 lb/in³/g/cm³ = 0.0226 lb/in³

4. The pressure on the wooden block is given by the formula: pressure = force/area. To find the pressure, we need to know the force acting on the block. Since the block is simply resting on the tabletop, the force acting on it is due to its weight. Using the formula for weight: w = mg, where w is weight, m is mass, and g is the acceleration due to gravity (9.8 m/s²).

To find the weight in newtons (N), we can use the conversion factor 1 kg = 9.8 N. So, the weight of the block is:

5 kg × 9.8 N/kg = 49 N

Using the area of the block's base (40 cm × 20 cm = 800 cm²), we can find the pressure in N/cm²:

pressure = 49 N/800 cm²

pressure = 0.06125 N/cm²

To convert N/cm² to psi, we can use the conversion factor 1 psi = 6894.76 N/m². So, the pressure in psi is:

0.06125 N/cm² × (1 m²/10,000 cm²) × (1 psi/6894.76 N/m²) = 0.0089 psi (rounded to four decimal places)

5. The pressure on the top surface of the wooden block is the same as the pressure calculated in part 4: 0.06125 N/cm² or 0.0089 psi.

6. To find the pressure on the bottom surface of the block, we can use the formula: pressure = force/area. Since the bottom surface has the same area as the top surface, the pressure will also be the same: 0.06125 N/cm² or 0.0089 psi.

7. The force acting on the top surface of the wooden block is simply its weight, which we calculated to be 49 N in part 4.

8. The force acting on the bottom surface of the wooden block is also its weight, which we calculated to be 49 N in part 4.

9. The force on the bottom surface is equal in magnitude to the force on the top surface.

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Answer:

Explanation:

The centripetal acceleration:

aₙ = F /m = 125 /19 ≈ 6.6 m/s²

A motorcycle was heading south at 90 m/s and then it turned west and went 35 m/s , the velocity of the motorcycle is 62.5 m/s. This is average velocity.

Velocity is the directional speed of an object in motion as an indication of its rate of change in position as observed from a particular frame of reference and as measured by a particular standard of time (e.g. 60 km/h northbound). Velocity is a fundamental concept in kinematics, the branch of classical mechanics that describes the motion of bodies.

Velocity is a physical vector quantity; both magnitude and direction are needed to define it. The scalar absolute value (magnitude) of velocity is called speed, being a coherent derived unit whose quantity is measured in the SI (metric system) as meters per second (m/s). If there is a change in speed, direction or both, then the object is said to be undergoing an acceleration.

Given

initial velocity , x=90m/s

final velocity , y=35m/s

formula for average velocity is \(\frac{1}{2}\) (x + y)

substituting the values

average velocity is 62.5m/s

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Answer:

I believe D

Explanation:

Of course the manufacturer would most likely be biased to the product the have created, but the other sources would have no reason to. Hope this helps!

Answer:

d = 6 km

Explanation:

In this case we have the relative speed of the boot changes, suppose that the boat and the river have the same direction when the boat goes from A to point B

       vbr = vrt + vbt

        vbr = 2 + 4

        vbr = 6 km / h

        v₁ = 6 km / h

velocity is constant

         v₁ = d / t₁

         t₁ = d / v₁

when the boat returns to the starting point the speed is both opposite

        vbr = vbt - vrt

        vbr = 4-2

        vbr = 2 km / h

        v₂ = 2 km / h

as the speed is constant

         t₂ = d / v₂

they also indicate that the total time is 4 h

       t₁ + t₂ = 4

we substitute

       4 = d / v₁ + d / v₂

       4 = d (1 / v₁ + 1 / v₂)

       d = 4 / (1 / v₁ + 1 / v₂)

let's calculate

       d = 4 / (1/6 + 1/2)

       d = 4 / 0.6666 67

       d = 6 km

The mass of the ball in kg is 2.5.

Here is how to calculate it:

We can use the formula for momentum, which is:p = mvWhere:p = momentum = mass = velocity

Rearranging the formula, we have:m = p/v

Given that the momentum of the ball is 20.1 kg m/s and its velocity is 9.9 m/s,

we can substitute these values into the formula to find the mass of the ball:m = 20.1 kg m/s ÷ 9.9 m/sm = 2.03 kg

Round off the mass to 1 decimal place, and we have:m = 2.5 kg

Therefore, the mass of the ball in kg is 2.5.

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The rotational kinetic energy of the propeller with the original mass is approximately 7.99 × 10⁵ joules.

In order to maintain the same kinetic energy with a reduced mass of 75.0%, the propeller's angular speed would 56.03 rpm.

To calculate the rotational kinetic energy of the propeller, we'll use the formula:

Rotational Kinetic Energy (KE) = (1/2) * I * ω²

Where:

KE is the rotational kinetic energy

I is the moment of inertia of the propeller

ω is the angular velocity of the propeller

Calculate the moment of inertia (I)

For a slender rod rotating about its center, the moment of inertia is given by:

I = (1/12) * m * L²

Where:

m is the mass of the propeller

L is the length of the propeller

Calculate the rotational kinetic energy (KE₁) with the original mass

To calculate the kinetic energy, we need to convert the angular velocity from rpm to radians per second (rad/s)

KE₁ = (1/2) * I * ω₁²

KE₁ = (1/2) * 18.0 kg·m² * (293.66 rad/s)²

KE₁ ≈ 7.99 × 10⁵ J

Determine the new mass of the propeller

Calculate the new angular velocity (ω₂) to maintain the same kinetic energy

To calculate the new angular velocity, we'll use the same formula as before, but solve for ω₂:

KE₂ = (1/2) * I * ω₂²

Since we want the new kinetic energy (KE₂) to be the same as the original (KE₁), we can equate the two equations:

(1/2) * I * ω₁² = (1/2) * I * ω₂²

Simplifying and solving for ω₂:

ω₂² = (ω₁² * m₁) / m₂

Where:

ω₁ is the original angular velocity

m₁ is the original mass

m₂ is the reduced mass

\(w_2 = \sqrt{w_1^2 * m_1) / m_2)}\)

ω₂ = \(\sqrt{293.66 rad/s)^2 * 90.0 kg / 67.5 kg)}\)

ω₂ ≈ 350.55 rad/s

Convert the new angular velocity to rpm

To convert ω₂ from radians per second to rpm:

ω₂rpm = ω₂ * (1 min/60 s) * (1 rev/2π rad)

ω₂rpm = 350.55 rad/s * (1 min/60 s) * (1 rev/2π rad)

ω₂rpm ≈ 56.03 rpm

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Answer:

The correct answer is B.

The astronaut will know due to the light from the explosion.

Explanation:

Sound and vibrations require a medium such as air to travel through. Space, there is no air. Only a vacuum. So sound and vibrations are unable to travel. Light requires no medium to travel. It can go through a vacuum.  

Therefore the Astronaut will see a bright flash of light as it travels from the explosion to outer space. It is also important to note that light can travel very far because nothing else interacts with its wave particles and as such, it cannot be impeded.

Cheers!

The capacitance of a parallel plate capacitor is 4.8 μF when charged with a potential difference of 1.25 V and a charge of 6.0 μC. In this calculation, the units are consistent.

The capacitance of a parallel plate capacitor can be calculated using the formula C = Q/V, where C is the capacitance, Q is the charge, and V is the potential difference. In this case, the charge is given as 6.0 μC and the potential difference is 1.25 V.

Substituting the given values into the formula, we have C = (6.0 μC) / (1.25 V). To simplify the units, we convert microcoulombs to coulombs by dividing by 10⁶, which gives C = (6.0 × 10⁻⁶ C) / (1.25 V).

Evaluating the expression, we find C = 4.8 × 10⁻⁶ F. Therefore, the capacitance of the parallel plate capacitor is 4.8 microfarads.

It is important to note that in this calculation, the units are consistent. The charge is in coulombs, the potential difference is in volts, and the capacitance is in farads.

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Answer:B

Explanation:They help you evaluate yourself for your final grade.

a dont make sense, d dont make sense, B or C. B!

Answer: Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

Answer:

just give the other person brainlyest

Explanation:

Answer:

speed/time

Explanation:

Answer:

a= (Vf - Vi)

         t

To find acceleration (a) you need to subtract the finale velocity (Vf) minus the initial velocity (vi) divided by time (t) as shown in the equation above.

Answer:

Its speed would be increasing.

Explanation:

If an object is moving with uniform velocity, it means that its speed and direction remain constant over time.

In this case, the equations of motion, which describe the relationship between an object's displacement, velocity, acceleration, and time, will not change.

The equations of motion for an object moving with uniform velocity are:

Displacement (s): s = ut + (1/2)at²

Final velocity (v): v = u + at

Velocity-time relationship: v = (s - u) / t

Displacement-velocity relationship: s = (v + u) / 2 * t

Acceleration (a): a = 0

In these equations:

s represents the displacement of the object.

u is the initial velocity of the object.

v is the final velocity of the object.

t is the time taken for the motion.

a denotes the acceleration of the object, which is zero in the case of uniform velocity.

Since the acceleration (a) is zero, the terms involving acceleration disappear from the equations, simplifying them. The equations reduce to:

Displacement (s): s = ut

Final velocity (v): v = u

Velocity-time relationship: v = s / t

Displacement-velocity relationship: s = v * t

In summary, when an object moves with uniform velocity, the acceleration term in the equations of motion becomes zero, simplifying the equations accordingly.

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Answer:

I can't read it if you zoom in its still blurry

Explanation:

read the question to me and I'll try to answer it thx

Explanation:

The resources that we value—time, money, labor, tools, land, and raw materials—exist in limited supply. There are simply never enough resources to meet all our needs and desires.

Explanation:

Time, money, labor, land , and raw materials

h= max

v= 0

t= 1.25

Vf= 0 at max height

vf = vi + at

0 = vi - 9.8 * 1.25

vi = 12.25 m/s

Answer:

17.565 kgm/s

Explanation:

Momentum = mass × velocity

I = mv..................... Equation 1

But we can calculate the value of v  using the equation of motion under gravity.

v² =  u²+2gs............. Equation 2

Where u = initial velocity, s = maximum heigth, g = acceleration due to gravity.

Given: u = 0 m/s (at the maximum heigth), s = 7.0 m.

Constant: g = 9.8 m/s²

Substitute these values into equation 2

v² = 0²+ 2×7×9.8

v² = 137.2

v = √137.2

v = 11.71 m/s.

Also given: m = 1.50 kg

substitute these values into equation 1

Therefore,

I = 1.5×11.71

I = 17.565 kgm/s

64°F is equivalent to 17.78°C.

A temperature unit developed from the SI (International System of Units) is Celsius (symbol: °C).

Prior to the adoption of the metric system, Fahrenheit (symbol: °F) was a commonly used measurement of temperature.

To convert Fahrenheit (°F) to Celsius (°C) we have to first subtract 32 from Fahrenheit and then multiply it by .5556 or 5/9.

We have to convert 64 degrees Fahrenheit (°F) to Celsius (°C),

We can use the following formula:

°C = (°F - 32) x 5/9

As per the given information,

°F = 64

By placing the value 99.3 for °F, we get:

°C = (64 - 32) x 5/9

°C= 32 x 5/9

°C = 160/9

°C = 17.78 (rounded to two decimal places)

Therefore, 64°F is equivalent to 17.78°C.

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Question :-   What is 64°F in °C?

Answer:

it was helpful to you dear

The power in the given simple circuit with a 5V battery power source and a 20 Ω resistor is 1.25 W.

To calculate the power in a simple circuit, we use the formula P = (V^2) / R, where P represents power, V is the voltage, and R is the resistance. In the given scenario, the circuit has a 5V battery power source and a 20 Ω resistor. Plugging in these values into the formula, we can calculate the power.

P = (5V)^2 / 20 Ω

Simplifying the expression, we have:

P = 25V^2 / 20 Ω

Dividing 25 by 20, we get:

P = 1.25V^2 / Ω

Therefore, the power in the circuit is 1.25 W (watts). This means that the circuit is dissipating energy at a rate of 1.25 joules per second.

The power value of 1.25 W indicates the rate at which electrical energy is transformed or transferred in the circuit. It represents the amount of work done or the amount of energy converted per unit of time. In this case, the power value suggests that the circuit is consuming or dissipating 1.25 joules of energy every second.

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The buoyant force on a 2.20 liter helium balloon can be calculated by multiplying the volume of the balloon by the density of the displaced air and the acceleration due to gravity. Assuming standard temperature and pressure (STP) conditions of 0°C and 1 atm, the density of air is approximately 1.29 g/L.

Buoyant force = volume of balloon × density of displaced air × acceleration due to gravity

Buoyant force = 2.20 L × 1.29 g/L × 9.81 m/s²

Buoyant force = 28.3 N

Therefore, the buoyant force on a 2.20 liter helium balloon is approximately 28.3 N. This means that the balloon experiences an upward force of 28.3 N due to the difference in density between the helium in the balloon and the surrounding air, allowing it to float in the air.

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Answer:

Select the crown at the bottom of an answer where the speech bubble icon is.

Answer:

A

Explanation:

More potential energy equals more kinetic

Answer:

Answer: b

Explanation:

Average Speed = Total Distance Total Time

Total Distance

Total Time

= 10m

    _  

    5 s

= 2 m/s

Answer: frequency

Explanation:

amplitude is the max height at which the wave reaches
wavelength distance b/w two waves

the speed at which the wave is oscillating

frequency is no. of oscillations of  a wave per unit length

In this model of a gravitational slingshot, the velocity of the spacecraft at position 2 is the same as the velocity of the craft at position 4.

At position 1, the direction of the spacecraft changes because of the gravitational pull of the planet. Position 3 represents the point of closest approach to the planet, where the gravitational force is the strongest. The gravitational slingshot effect increases the spacecraft's velocity as it passes the planet and moves away from it, thus allowing it to reach greater speeds than would be possible otherwise.

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The maximum displacement of the block from its equilibrium position is 0.063 meters.

To solve this problem, we can first find the initial potential energy stored in the spring by using the formula: PE = 0.5kx^2, where k is the spring constant and x is the initial displacement from equilibrium (which is zero). Thus, the initial potential energy is 0 J. Then, we can use the principle of conservation of energy to find the maximum displacement of the block from its equilibrium position. Since there is no external work done on the block-spring system, the initial kinetic energy of the block is converted entirely into potential energy stored in the spring when the block reaches its maximum displacement. Using the formula for kinetic energy, KE = 0.5mv^2, where m is the mass of the block and v is the initial velocity, we can find the initial kinetic energy to be 1.44 J. Setting the initial kinetic energy equal to the final potential energy, we can solve for x to find the maximum displacement of the block from its equilibrium position to be 0.063 meters.

It is important to note that the almost instantaneous hit with the hammer means that we can assume the time interval over which the force is applied to be very short and thus the impulse of the force can be treated as an instantaneous change in momentum of the block. Therefore, the conservation of momentum principle can be ignored in the problem.

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