4- A4 x 10¹ N truck moving west at a velocity of 8 m/s collides with a 3x10 N truck heading south at a velocity of 5 m/s. If these two vehicles lock together upon impact, what is their velocity? (5 m

For a long straight wire carrying conductor the magnitude of the magnetic field produced around it  is proportional to I/r, and the direction is out of the page at P.

A magnetic field is produced by moving charges. Charges are constantly moving in a conductor carrying current; as a result, magnetic fields are created all around the conductor.

The right-hand thumb rule indicates the direction of this magnetic field. The thumb of the right hand is used in this rule to indicate the current's direction. The direction of the magnetic field surrounding the wire is indicated by the curled fingers.

The magnitude of the magnetic field produced by the current carrying conductor depends on the following factors:

The magnitude of the current flowing through the conductor

The distance to the point where the field value is calculating.

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The rate at which the volume of the box is increasing is 3 cubic feet per minute. We can use the formula for the volume of a rectangular box, which is V = lwh.

To find the rate at which the volume is increasing, we need to take the derivative of V with respect to time t:  dV/dt = (dV/dl) * (dl/dt) + (dV/dw) * (dw/dt) + (dV/dh) * (dh/dt) , We know that dl/dt = dw/dt = 4 ft/min (since both the length and width are increasing at the same rate), and dh/dt = -5 ft/min (since the height is decreasing).
To find the values of dV/dl, dV/dw, and dV/dh, we can take the partial derivatives of V:
dV/dl = wh
dV/dw = lh
dV/dh = lw
Substituting these values and the given dimensions (? = 4, w = h = 2), we get:
dV/dt = (2 * 2 * 4) + (4 * 2 * 2) + (4 * 2 * (-5))
= 16 + 16 - 40
= -8

To find the rate of change of the volume (V) with respect to time, we first need to find the expression for the volume of the box, which is given by V = lwh. Now, we differentiate V with respect to time (t) to get the rate of change: dV/dt = dl/dt * wh + dw/dt * lh + dh/dt * lw
Given that dl/dt = dw/dt = 4 ft/min and dh/dt = -5 ft/min, we can plug these values into the equation above, along with the values of l, w, and h: dV/dt = 4 * 2 * 2 + 4 * 4 * 2 + (-5) * 4 * 2 = 16 + 32 - 40 = 12 ft³/min.
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Answer:

Isotopes can both be the same element but have a different number of electrons

Explanation: not sure if more was supposed to be there, but i tried

If the electron has moved across the entire gap between the plates its speed is 1.98x10^7m/s

Given  uniform electric field of a magnitude (E) =  28,000N/C

Distance the plates are separated by (s) = 4 cm = 4x10-2m

We know that the charge on an electron (q) = -1.6 * 10^-19

We know that force acting on a particle = F = qE

F = 28 * 10^3 * (- 1.6 * 10^-19) = -4.48 * 10^-15

We know that the mass of an electron (M) = 9.1 x 10^-31 kg

We know that F = Ma where a is acceleration then

a = F/M = 4.48 * 10^-15/9.1 x 10^-31 = 0.492 x 10^16 m/s^2

From newtons laws of motion we know that v^2 = 2as

then v = √2x0.492 x 10^16x4x10-2 = 1.98x10^7m/s

Hence the speed of electron is 1.98x10^7m/s

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The example that is NOT an example of Simple Harmonic Motion is:

A ball rolling down a hill.

Simple Harmonic Motion is a type of periodic motion where the restoring force is proportional to the displacement from equilibrium and is directed towards the equilibrium point. The classic example of simple harmonic motion is the motion of a mass attached to a spring that is oscillating back and forth. Other examples of simple harmonic motion include a pendulum swinging back and forth and the vibration of a guitar string.

A ball rolling down a hill does not exhibit simple harmonic motion because it does not have a restoring force that is proportional to the displacement from equilibrium. The motion of the ball is affected by the force of gravity, which is not directed towards the equilibrium point, and the frictional force between the ball and the surface of the hill, which is not proportional to the displacement from equilibrium. Therefore, it is not an example of simple harmonic motion.

Answer: B

Explanation: just did the quiz

Vector B shows the direction of the centripetal acceleration at this point.

Centripetal acceleration is the acceleration of a frame traversing a circular path. because the pace is a vector quantity (this is, it has both a magnitude, the rate, and a course), when a frame travels on a circular course, its route continuously adjustments, and accordingly its velocity changes.

Centripetal forces motivate centripetal accelerations. within the special case of the Earth's circular motion around the sun – or any satellite's ground movement around any celestial body – the centripetal force causing the movement is the end result of the gravitational enchantment among them.

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The requirement of the charge densities on the surfaces of the plates is that the charge on the plates must be of the same amount but in the opposite direction in order to complete this field. This condition requires that the charge on the plates be of the same amount but in the opposite direction.

What is an electric field?

It is a physical field that a charged particle occupies on another particle in its environment. In order to form this field, the charge on the plates must be the same amount but going in the opposite direction.

The parallel plate capacitor is the term given to the device that holds a charge. The charge concentrations on the plate surfaces will be under the following conditions:

The charges on the plates must be identical in size and directed in the opposite direction.

This enables the addition of fields to the inside of the plates and the removal of fields from the outside.

Therefore, in order to form this field, the charge on the plates must be the same amount but applied in the opposite direction.

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Answer:

2

1

2

1

3

1

Explanation:

I'm pretty sure these are right. you might want to go back and check the first and third, but the other 4 are right

The greater mass will have greater acceleration is a fact from second law of motion. Thus, first situation is an example of second law. Spilling of water from the glass indicates the first law , that is law of inertia.

Newton' s first law of motion states that, every body tends to continue on the state of motion or rest until an external force acts upon it. This law is called law of inertia.

Second law states that the force applied on a body is directly proportional to the mass and acceleration.

Newton's third law states that, for every action there is an equal and opposite reaction. The first statement indicates the second law of motion and water spilling indicates the law of inertia.

As the mass increases, more force to be applied and acceleration decreases with mass. Thus third situation indicates second law. The magician pulling the cloth from stationary, hence it is first law.

A rocket launches by a force applied on the space and an opposing force from the fuel make it move indicating the third law. The last situation indicates the first law. Hence, the labeling is as 2,1,2,1,3,1.

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Answer: It's D

Explanation:

Explanation:

Write equations for the position of each car as a function of time.  (Make sure to convert units if they're different.)

The red car's position x at time t is:

x = (14.41 cm/s) t + 60 cm

The blue car's position x at time t is:

x = (41.32 cm/s) t

To find when they meet, set the equations equal to each other.

(14.41 cm/s) t + 60 cm = (41.32 cm/s) t

60 cm = (26.91 cm/s) t

t = 2.230 s

Answer:

The first law: the law of Inertia.

Explanation:

Newton’s first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Answer:

1st, 2nd, & 3rd law

Explanation:

there is no 5th/4th law ppl

I did this question and it says SELECT 3 OPTIONS not 1 (This answer isn’t meant to be rude but just stating what the question says.)

Evolution, is a process that results in changes in the genetic material of a population over time.

Answer:

Shorter

Explanation:

Waves become shorter and closer together as pitch increases

The story that describes the graph is, we  were accelerating from our starting point A to the next point B, then from point B started decelerating to our next point C, rested between point C and D, and finally we started our journey again by accelerating to point E.

A displacement time graph, is a type of graph that is used to describe the motion of an object with respect of how the object is changing its position with time.

The change in position with change in the time of motion of the object gives velocity of the object which is also equal to the slope of the graph.

v = Δx / Δt

where;

From the given graph we can conclude the following based on the motion;

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I inferred you've referring to a close electrical circuit.

Answer:

The circuit is complete.

Explanation:

A closed electrical circuit is indeed a complete circuit. Also, it allows charges to flow, the bulbs in the circuit will shine and it is not broken.

It is termed closed circuit because there is no brokage in the series of electrical wires or the switch; which may prevent the free flow of current or charges. Thus, a feature that marks closed circuits is that they are complete.

Answer:

The circuit is complete.

Explanation:

Given that the time between when the marathon runner changes her velocity and the finish line is t, the acceleration of the runner approaching the finish line is 0.22/t m/s² .

The acceleration of a body is the change in the velocity of a body with time.

Acceleration is a vector quantity as it takes into account the change in velocity as well as the change in the direction of the body.

Hence, a body is accelerating if either or both of these two conditions apply:

Mathematically;

The change in velocity of a body = Final velocity - initial velocity

Change in velocity of the runner = 4.17 - 3.95

Change in velocity of the runner = 0.22 m/s

Time taken for this change = t

Hence;

acceleration = 0.22/t m/s²

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Answer

you need to give the speed (velocity)

Explanation:

with the speed given you input that into d= v*t

you know one hour or 60 minutes or 3600 seconds which are all equivalent and you can use any as the units need to be the same to do any equation and multiply that by the speed that you have already

Answer: A

Explanation:

The speedometer of a car measures instantaneous speed. It tells you the speed of the car at any given moment in time.

The speedometer of a car measures instantaneous speed. This means it gives the reading of the speed at any given moment in time.

Main part: The speedometer of a car measures instantaneous speed. It tells you how fast you are driving at that particular moment. The speedometer gives you a direct reading of how fast your vehicle is traveling. It measures the vehicle's speed at any given moment in time, rather than calculating the average speed of the entire journey.

A speedometer is attached to a vehicle's wheels to measure its speed. As the wheels turn, the speedometer calculates the speed at which they are turning. Inside the speedometer, there is a component called a speedometer cable. This component is connected to the back of the speedometer's drive mechanism. The other end of the cable is connected to a gear that is inside the transmission or the transfer case. When the vehicle is moving, the driveshaft turns the gears in the transmission or transfer case. The gear connected to the speedometer cable also turns, causing the cable to rotate. The rotation of the cable creates a magnetic field that drives the speedometer's magnetometer, which is connected to the speedometer pointer. This causes the pointer to move along the dial and show the speed of the vehicle on the speedometer.

Conclusion: In conclusion, the speedometer of a car measures instantaneous speed. It tells you the speed of the car at any given moment in time.

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Answer:

20.3N

Explanation:

Given parameters:

Area of the eardrum  = 0.0002m²

Pressure on the eardrum  = 1atm  = 101325Nm⁻²

Unknown:

Force exerted on the eardrum  = ?

Solution:

Pressure is the force per unit area impacted on a body.

      Pressure  = \(\frac{Force }{area}\)  

  Force  = Pressure x  area

Now insert the parameters and solve;

  Force  =  101325Nm⁻²  x  0.0002m²  = 20.3N

Answer:aka

Explanation:

mekje

Answer:

A positive velocity

Explanation:

Answer:

Volume

Explanation:

The mass (in grams) Ricardo should measure out on the scale, given that he has 2500 mg is 2.5 g (Option B)

To obtain the mass that Ricardo should measure out on the scale, we shall convert 2500 milligrams (mg) to grams (g). This is illustrated below:

Conversion scale

1000 mg = 1 g

Therefore

2500 mg = (2500 mg × 1 g) / 1000 mg

2500 mg = 2.5 g

From the above, we can see that 2500 mg is equivalent to 2.5 g

Thus, we can conclude from the above illustration that the mass Ricardo should measure out on the scale is 2.5 g (Option B)

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The given expression can be written in an expanded form as 4,350,000

Given expression:

\(4.35 \times 10^6\)

To find:

To expand the given expression, multiply 4.35 by 1,000,000

\(= 4.35 \times 1,000,000\)

move the decimal point six (6) places to the right and you will obtain the following result.

\(= 4,350,000\)

Therefore, the expanded form of the expression is 4,350,000

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Answer:

The temperature at which the Kelvin scale reading is double the Fahrenheit reading is 176.69 F = 353.38 K

Explanation:

K = 2F

→ 2F = 273 + (5/9)(F - 32)

→ 18F = 2457 + 5F - 160

→ 18F - 5F = 2457 - 160

→ 13F = 2297

→ F = 2297/13

→ F = 176.69° F

K = 2F

→K = 2 * 176.69

→ K = 353.38K

Answer:

1 m/s so number 2 is the right one

Explanation:

so when it is at rest it still has some of the left over energy so it would be at 1 m/s

The time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

The cooling law is given by:

$$\frac{dQ}{dt}=-k(T-T_0)$$

where Q is the heat in the object, t is the time taken, T is the temperature of the object at time t, T0 is the temperature of the environment and k is a constant known as the cooling constant.

We need to find the time it takes for the coffee to reach a drinking temperature of 73°C given that its initial temperature is 93°C.

Therefore, we need to find the time it takes for the coffee to cool down from 93°C to 73°C when placed in a room temperature of 18°C.

Let’s assume that the heat energy that is lost by the coffee is equal to the heat energy gained by the environment. We can express this as:

dQ = - dQ where dQ is the heat energy gained by the environment.

We can substitute dQ with C(T-T0) where C is the specific heat capacity of the object.

We can rearrange the equation as follows:

$$-\frac{dQ}{dt}=k(T-T_0)$$

$$-\frac{d}{dt}C(T-T_0)=k(T-T_0)$$

$$\frac{d}{dt}T=-k(T-T_0)$$

The differential equation above can be solved using separation of variables as follows:

$$\frac{d}{dt}\ln(T-T_0)=-k$$

$$\ln(T-T_0)=-kt+c_1$$

$$T-T_0=e^{-kt+c_1}$$

$$T=T_0+Ce^{-kt}$$

where C = e^(c1).

We can now use the values given to find the specific value of C which is the temperature difference when t=0, that is, the temperature difference between the initial temperature of the coffee and the room temperature.

$$T=T_0+Ce^{-kt}$$

$$73=18+C\cdot e^{-0.09t}$$

$$55=C\cdot e^{-0.09t}$$

$$C=55e^{0.09t}$$

$$T=18+55e^{0.09t}$$

We can now solve for the value of t when T=93 as follows:

$$93=18+55e^{0.09t}$$

$$e^{0.09t}=\frac{93-18}{55}$$

$$e^{0.09t}=1.3636$$

$$t=\frac{\ln(1.3636)}{0.09}$$

Using a calculator, we can find that the time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

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