A closed system consists of a pendulum that is swinging back and forth. If
the pendulum's kinetic energy decreases, what else must happen to the
energy of the system?
a
A. Its gravitational potential energy must decrease.
B. Its total mechanical energy must increase.
O C. Its total mechanical energy must decrease.
O D. Its gravitational potential energy must increase.

Answer:the specific heat is the measure of how much heat per unfit mass required to raise the temperature by 1 degrees Celsius.the formula is given as Q= cm T where

Q= the amount of heat added

C= specific heat of a substance

T= change in temperature in degrees Celsius

Q=(4186 j/kg degrees Celsius (.109 kg) (8.93- degrees Celsius)=4974.53J

Explanation:

The mass of the copper coin placed in 101g of water is 135.3g.

The mass of the copper coin can be calculated using the following expression:

Since; Q = mc∆T

Where;

mc∆T (water) = mc∆T (copper)

According to this question;

COPPER METAL:

WATER:

101 × 4.18 × 8.39 = (0.385 × m × 68)

3542.09 = 26.18m

m = 3542.09 ÷ 26.18

m = 135.3g

Therefore, the mass of the copper coin placed in 101g of water is 135.3g.

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Answer:

32.0 Ω

Explanation:

Ohm's law:

V = IR

128 V = (4.00 A) R

R = 32.0 Ω

If 128 volts are required to push 4.00 A of current through a resistor, then the resistance of the resistor is 32 ohms, and Ohm's Law is used to solve for the resistance of the resistor.

Ohm's Law is a fundamental law of electricity that relates the three basic electrical quantities of voltage, current, and resistance, and states that the current flowing through a conductor is directly proportional to the voltage applied across it and is calculated below,

Ohm's Law is used to solve for the resistance of the resistor

Ohm's Law: V = IR

(Here, V =the voltage (in volts), I =the current (in amperes), and R =the resistance (in ohms) )

Given , 128 V is required to push 4.00 A of current through the resistor, one can substitute these values into Ohm's Law and R is solved,

R = V/I

R = 128 V / 4.00 A

R = 32 Ω

Hence, if 128 volts are required to push 4.00 A of current through a resistor, then the resistance of the resistor is 32 ohms.

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Answer:

a. Convert  120 × 10⁸ g to i mg = 1.2 × 10¹³ mg ii. to g = 1.2 × 10⁷ kg

b. Convert 200000 × 10³ m to i. micrometers = 0.2 × 10³ μm  ii. to cm = 2 × 10⁶ cm iii. to km = 2 × 10⁵ km

Explanation:

a. i. To convert the mass = 120 × 10⁸ g to mg, We know that 1000 mg = 10³ mg = 1 g, Since we are converting to mg, 120 × 10⁸ g = 120 × 10⁸ × 1g = 120 × 10⁸ × 10³ mg = 120 × 10¹¹ mg = 1.2 × 10² × 10¹¹ mg = 1.2 × 10¹³ mg

ii. To convert the mass = 120 × 10⁸ g to kg, We know that 1000 g = 10³ g = 1 kg, 1 g = 10⁻³ kg. Since we are converting to kg, 120 × 10⁸ g = 120 × 10⁸ × 1g = 120 × 10⁸ × 10⁻³ kg = 120 × 10⁵ kg = 1.2 × 10² × 10⁵ kg = 1.2 × 10⁷ kg

b. i.To convert the length = 200000 × 10³ m to micrometers, We know that 1/1000000 μm = 10⁻⁶ mg = 1 m, Since we are converting to micrometers, μm, 200000 × 10³ m = 200000 × 10³ × 1 m = 200000 × 10³ ×  1/1000000 μm = 200000/1000000 × 10³ μm = 0.2 × 10³ μm

ii. To convert the length = 200000 × 10³ m to cm, We know that 100 cm = 10² cm = 1 m, 1 m = 10⁻² cm = 1/100 cm. Since we are converting to cm, 200000 × 10³ m = 200000 × 10³ × 1 m = 200000 × 10³ × 1/100 cm = 200000/100 × 10³ cm = 2000 × 10³ cm  = 2 × 10³ × 10³ cm = 2 × 10⁶ cm

iii. To convert the length = 200000 × 10³ m to km, We know that 1000 m = 10³ m = 1 km, 1 m = 10⁻³ km = 1/1000 km Since we are converting to km, 200000 × 10³ m = 200000 × 10³ × 1 m = 200000 × 10³ ×  1/1000 km = 200000/1000 × 10³ km = 200 × 10³ km = 2 × 10² × 10³ km = 2 × 10⁵ km

The term you are looking for is "chemical battery". Chemical batteries work by converting chemical energy into electrical energy through a series of chemical reactions. These reactions take place within the battery's cells, which are composed of two electrodes and an electrolyte.

When the battery is connected to a circuit, the chemical reactions produce an electrical current that can be used to power devices. Chemical batteries are widely used in many applications, including consumer electronics, electric vehicles, and renewable energy systems. They are a crucial component of our modern technological society, and ongoing research is focused on developing more efficient and sustainable battery technologies to meet growing energy demands.

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Answer:

The geosphere consists of the solid Earth and the atmosphere consists of the gaseous components in the air. Thus, the answer is C.

Explanation:

Answer:

C

Explanation:

Answer:

2000 m/s

Explanation:

The speed of a wave is it's frequency * wavelength. In this case, the frequency is 0.25 Hz (waves per second) and the wavelength is 8000m. So the speed of the wave will be 0.25Hz * 8000m which is 2000 meters per second.

A tsunami when hits north California, its speed will be 2000m/s.

The tsunami caused by the movement of tectonic plates at the sea or ocean floor or due to large volcanic activities . These are high energy waves that can destroy everything.

Speed was the pace as well as the direction of an object's movement, whereas speed would be the time rate whereby an object is traveling along a path. In other words, velocity is just a vector, whereas speed would be a scalar value.

In the question, given data is ,

frequency (n) = 0.25 Hz.

Wavelength (λ) = 8000msince

speed of wave  (v) = n.λ

on putting values.    

v = 0.25×8000 =2000m/s

Hence, the speed of the wave is 2000m/s.

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The velocity of the car when it began coasting was approximately 17.2 m/s.

If a car is coasting without any external force acting on it (such as friction), then its initial kinetic energy is converted entirely into potential energy as it moves uphill. Therefore, we can use the principle of conservation of energy to solve this problem.

The principle of conservation of energy states that the total energy of a closed system (in this case, the car and the Earth) remains constant over time. Therefore, the initial kinetic energy of the car is equal to the potential energy gained as it moves uphill. Mathematically, we can express this as:

1/2 mv^2 = mgh

where:

m = mass of the car

v = initial velocity of the car when it began coasting

g = acceleration due to gravity (9.8 m/s^2)

h = height gained by the car (15 m)

We can simplify this equation by canceling out the mass (m) on both sides:

1/2 v^2 = gh

Substituting the given values, we get:

1/2 v^2 = 9.8 m/s^2 * 15 m

v^2 = 2 * 9.8 m/s^2 * 15 m

v = √(2 * 9.8 m/s^2 * 15 m)

v ≈ 17.2 m/s

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F b = (m * v) / t is the formula for the amount of average net force needed to reach a specific velocity.

Average speed is determined by dividing the total distance you travelled by the total time, whereas average velocity is determined by dividing your displacement (a vector pointing from your initial position to your end position) by the whole time.

The following formula can be used to determine the average net force, F b, necessary to reach a specific velocity, v:

F_b = (m * v) / t

Its net force, which is inversely related to its mass, is:

a = F_net / m

The final velocity can be related to the acceleration and time using the following kinematic equation because the fist's velocity is attained from rest:

v = a * t

When we enter the acceleration expression from Newton's second law into this equation, we obtain:

v = (F_net / m) * t

To solve for the net force by rearranging this equation, we obtain:

F_net = (m * v) / t

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Using the appropriate arithmetic operation, the amount of potatoes and cabbage require for the voyage are 19998 and 26664 respectively.

Total number of passengers = (47 + 32 + 22) = 101

1.)

If each person gets 3 potatoes per day :

Number of potatoes needed per day = (3×101) = 303

Number of potatoes needed for entire voyage = (303 × 66) = 19998 potatoes.

2.)

If each person gets 4 cabbage per day :

Number of cabbage needed per day = (4×101) = 404

Number of cabbage needed for entire voyage = (404 × 66) = 26664 cabbages.

Hence, the number of cabbage needed for the voyage would be 26664 cabbages.

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Answer:

How much you pay in taxes depends on the amount of your taxable income

Explanation:

The total amount expected to be payed as taxes is a factor of the amount of taxable income earned within the given tax period.

The taxable income is found by subtracting the amount of deductions and exemption allowed in the tax year from the gross income. It is also specified as the adjusted gross income

The set marginal  tax rate indicates the percentage of the taxable income that is to be paid as taxes, such that there are three different ranges or tax brackets and taxes are paid according to the bracket to which a taxable income belongs.

Answer:

It has 11 electrons 23_11=11

Sound is detected when a sound wave causes the eardrum to vibrate. typically, the eardrum has a diameter of 8.4mm in humans. 5.54 watts of energy is delivered to the eardrum each second when someone whispers (20 dB) in your ear.

To calculate the energy delivered to the eardrum each second when someone whispers in your ear, we need to consider the sound intensity and the effective area of the eardrum.

Given:

Diameter of the eardrum (d) = 8.4 mm = 0.0084 m

Sound intensity (I) = 20 dB

First, we need to convert the diameter of the eardrum to radius (r):

r = d / 2

r = 0.0084 m / 2

r = 0.0042 m

The effective area of the eardrum (A) can be calculated using the formula for the area of a circle:

A = π * r²

A = π * (0.0042 m)²

A = 0.0554 m²

Next, we need to convert the sound intensity from decibels (dB) to watts per square meter (W/m²). The formula for this conversion is:

I (W/m²) = \(10^{(I (dB) / 10)}\)

I (W/m²) = \(10^{(20 dB / 10)}\)

I (W/m²) = \(10^{2}\)

I (W/m²) = 100 W/m²

Now, we can calculate the energy delivered to the eardrum each second (E) using the formula:

E = I * A

E = 100 W/m² * 0.0554 m²

E ≈ 5.54 W

Therefore, approximately 5.54 watts of energy is delivered to the eardrum each second when someone whispers (20 dB) in your ear.

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Answer:

6

.40 recharge

1.0v

45.0v

To find the collision rate, known the magnitude.

What is magnitude?

Magnitude typically refers to size or distance. By comparing the size and motion speed of the thing, we can relate magnitude to movement. The object's or quantity's size determines its magnitude.

What is mean by collision rate?

The frequency of collisions between a single particle of radius m and particles with masses ranging from (m1, m1 + m1) to (m, m1) is proportional to their concentration, n(m1) m1, where (m, m1) is the rate constant for collisions between the two particles of masses m and m1 and depends on the process. 

u=140kmph

t=7.oms

v=0

E=M(V-U)/t

⇒m(0-140)/0.007×5/18m/s

⇒5555.55 (m) N

E=(5555.55) (mass) N

Therefore, the collision lasts is 5555.55(m) N.

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A. Spacecraft measurements near Venus indicate that the planet has a very powerful magnetic field, much stronger than that of Earth.

Venus is one of the four terrestrial planets in the solar system with a magnetic field, along with Earth, Mercury, and Mars. The Venusian magnetic field is believed to be generated by the planet's iron-rich core, similar to the magnetic fields of the other terrestrial planets.

However, the Venusian magnetic field is much weaker than that of Earth, and it is not strong enough to provide significant protection from the solar wind or radiation.

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Yes, an object can have zero velocity and non-zero acceleration at the same time.

Let's take an example of a tennis ball. If we throw the tennis ball vertically upward, the ball will have zero velocity at the highest point. At that point, the gravity is still acting downwards on the tennis ball. At this point, the ball has zero velocity and accelerates downward with gravitational acceleration = 9.8m/s.

Another example is oscillatory motion. In oscillatory motion, the acceleration is always opposite to the velocity. When the velocity becomes zero at the extreme position the body has non-zero acceleration.

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The magnetic field of a wave propagating through a certain nonmagnetic material can be described by the Maxwell's equations, which govern the behavior of electromagnetic waves.

In particular, the magnetic field is related to the electric field and the rate of change of the electric field by the equation known as Faraday's law. This law states that a changing magnetic field induces an electric field, and vice versa.

However, since the material in question is nonmagnetic, there are no free magnetic charges that can interact with the electromagnetic wave. Therefore, the magnetic field is solely due to the changing electric field, which in turn is caused by the oscillation of charged particles in the material. The exact form of the magnetic field depends on the geometry of the wave and the properties of the material, such as its permittivity and conductivity.

In summary, the magnetic field of a wave propagating through a nonmagnetic material is determined by Faraday's law and the interaction of the electric field with charged particles in the material.

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To find the speed of the stone when it is at a height of 14m, we can use the principles of projectile motion and conservation of energy.

At the highest point of its trajectory, the stone momentarily comes to rest before falling back down. At this point, all of its initial kinetic energy is converted into gravitational potential energy.

Using the conservation of energy, we can equate the initial kinetic energy to the potential energy at a height of 14m:

(1/2)mv^2 = m g h

Where:

m = mass of the stone (which cancels out)

v = velocity of the stone

g = acceleration due to gravity

h = height

Rearranging the equation, we can solve for v:

v = sqrt(2gh)

Substituting the values, we get:

v = sqrt(2 * 9.8 m/s^2 * 14 m) = 18.92 m/s

Therefore, the stone is moving at a speed of approximately 18.92 m/s when it is at a height of 14m.

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Answer:

because there isn't any gravity there

The output force on the piece of food the chopsticks pick up is mechanical advantage times 3 N.

The force amplified by utilising a tool, mechanical device, or machine system is known as mechanical advantage. To achieve the desired output force amplification, the gadget trades off input forces against movement.

Mathematically:

mechanical advantage = output force/input force

Given that input force = 3 N.

Hence, output force = mechanical advantage × 3 N.

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The magnitude of the magnetic force on the proton is 4.31 × 10⁻¹¹ N.

Given values: B = 5.5 Tθ = 25°q = 1.602 × 10⁻¹⁹ VC = 1.00 × 10⁷ m/s Formula: The formula to calculate the magnetic force is given as;

F = qvBsinθ

Where ;F is the magnetic force on the particle q is the charge on the particle v is the velocity of the particle B is the magnetic field strengthθ is the angle between the velocity of the particle and the magnetic field strength Firstly, we need to determine the angle between the velocity vector and the magnetic field vector.

From the given data, The angle between velocity vector and x-axis;α = -15°The angle between magnetic field vector and x-axis;β = 25°The angle between the velocity vector and magnetic field vectorθ = 180° - β + αθ = 180° - 25° - 15°θ = 140° = 2.44346 rad Now, we can substitute all given values in the formula;

F = qvBsinθF

= (1.602 × 10⁻¹⁹ C) (1.00 × 10⁷ m/s) (5.5 T) sin (2.44346 rad)F

= 4.31 × 10⁻¹¹ N

Therefore, the magnitude of the magnetic force on the proton is 4.31 × 10⁻¹¹ N.

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Answer:

0.6

Explanation:

Answer:

C. Newton's First Law of Motion

Explanation:

As the car comes to an abrupt stop, the body is still moving forward, and is moved back by the seatbelt, an outside force. If not for the seatbelt, the body would continue forward until acted on by the car itself, or thrown out of the car.

Answer:

1st law

Explanation:

Answer:

10% efficiency

Explanation:

Formula for efficiency :

⇒ Efficiency (η) = Output energy (E₂) / Input energy (E₁)

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

Given :

⇒ Input Energy (E₁) = 150 J

⇒ Output Energy (E₂) = 15 J

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

Solving :

⇒ η = 15/150

⇒ η = 1/10

⇒ η = 10% efficiency

it will experience great force

Answer:

Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion

Explanation:

Answer:

Sea fish

Explanation:

Sea fish doesn't breath through their gills but dissolved oxygen in water through gills