m
Bcth drives cast at 30 , then slows to a stop at the red light. A graph of her velocity over time is shown below,
s
where castward is the positive velocity direction.
Velocity
30
A
20+
10+
MY
Pro
2
4
6
8
10
Time (s)
Pro
Теа
Which graph shows her acceleration over time?
Choose1

\(\huge\mathfrak\red {Answer:}\)

If a train travelled 500 meters in 25 seconds then,

Speed = 500m/25sec

\(\mathfrak\purple {Hope\: this\: helps\: you...}\)

speed=500m/25sec

20m/sec

The number of electrons is 1.9 * 10^20 electrons.

We know that it is possible to obtain the charge that the electron carries by the use of the formula;

Q = It

Q = magnitude of charge

I = current

t = time taken

Now we have the charge as;

Q = 0.5 A * 60 s = 30 C

Given that;

Q = ne

Q = charge

n = number of electrons

e = magnitude of electronic charge

n = Q /e = 30 C / 1.6 x 10-¹⁹ C​

n = 1.9 * 10^20 electrons

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It would take approximately 5.46 seconds to move the desk 5.9 meters across the warehouse floor with a steady force of 19 N.

To calculate the time it takes to move the desk across the warehouse floor, we can use Newton's second law of motion, which states that force equals mass multiplied by acceleration (F = m * a). In this case, the force exerted is 19 N, and the mass of the desk is 48 kg. To determine the acceleration, we can rearrange the formula to a = F / m. Plugging in the values, we have a = 19 N / 48 kg ≈ 0.396 N/kg.

Now, we need to calculate the time it takes to cover a distance of 5.9 m with a constant acceleration of 0.396 N/kg. To do this, we can use the equation of motion: distance (d) equals initial velocity (v) multiplied by time (t), plus one-half times acceleration (a) multiplied by time squared (t^2). Since the initial velocity is zero, the equation simplifies to d = (1/2) * a * t^2.

Rearranging the formula to solve for time, we get t = √(2 * d / a). Plugging in the values, we have t = √(2 * 5.9 m / 0.396 N/kg) ≈ √29.798 ≈ 5.46 seconds.

Therefore, it would take approximately 5.46 seconds to move the desk 5.9 meters across the warehouse floor with a steady force of 19 N.

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The four factors the quantity of heat lost or gained by body depends specific heat capacity.

Specific heat capacity:

     The quantity of heat absorbed per unit mass of the material when its temperature gets increases by 1K is said to be Specific heat Capacity.

The unit of specific heat capacity is J/(kg K).

The transferred heat depends on three factors:

Hence, these are the four factors the quantity of heat lost or gained by body depends.

Formula for specific heat capacity is,

                         \(Q=mc\Delta T\)

Q - heat energy

m - mass

c - specific heat capacity

ΔT - change in temperature.

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From the given circuit the current in resistor R is 2A, the resistance R is 5ohm,  the unknown emf E is 42V and if the circuit is broken at point x, the current in resistor R is zero.

Given the diagram, the voltage passing through resistor R (V) =  28V

The current passing through resistor R is = I1

The resistance of second resistor (R2) =6 ohm.

The current passing through R2 = 4A

The resistance of third resistor (R3) = 3 ohm

The current passing through R3 = 6A

The emf at resistor R2 = e

Here we can see that current passing through R3 is split into I1 and I2 such that I1 + I2 = I3. Then, I1 + 4 = 6A

I1 = 2A

(a) The current in resistor R = 2A

(b) From ohms law we know that V = IR. Then V1 - I3R3 -I1R1 = 0

28 - (3 x 6) - (2 x R) = 0. then R = 5ohm.

The resistance R = 5 ohm

(c) Similarly, e - (3 x 6) - ( 6 x 4) = 0

Then e = 42V

The unknown emf = 42V

(d) When the circuit is broken at x, that branch is eliminated from the circuit. It will stop carrying current. The distribution of currents and voltages in the other portions of the circuit will vary as a result.

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The energy required to accelerate a particle to speeds of 0.5c, 0.9c, and 0.99c can be calculated as 1.15E₀, 2.29E₀, and 7.08E₀, respectively, where E₀ represents the rest energy of the particle.

Einstein's mass-energy equivalence states that the total energy (E) of an object is equal to its mass (m) multiplied by the speed of light (c) squared, E = mc². To calculate the energy required to accelerate a particle to a specific speed, we need to consider the relativistic effects.

To express the energy in terms of the rest energy (E₀), we divide the total energy (E) by mc², resulting in E/E₀. Thus, for speeds of 0.5c, 0.9c, and 0.99c, we can calculate the energy required as follows:

a) For a speed of 0.5c:

  E/E₀ = (mc²)/(mc²) = 1E₀

  The energy required is equal to the rest energy.

b) For a speed of 0.9c:

  E/E₀ = γmc²/mc² = γ = 1/(1 - v²/c²)^(1/2)

  Here, v = 0.9c, so γ = 2.29

  The energy required is 2.29E₀.

c) For a speed of 0.99c:

  E/E₀ = γmc²/mc² = γ = 1/(1 - v²/c²)^(1/2)

  Here, v = 0.99c, so γ = 7.08

  The energy required is 7.08E₀.

Therefore, the energy required to accelerate a particle to speeds of 0.5c, 0.9c, and 0.99c is 1.15E₀, 2.29E₀, and 7.08E₀, respectively, where E₀ represents the rest energy of the particle.

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The relationship between kinetic energy and pressure energy is derived from the Bernoulli equation, which describes the conservation of energy in fluid flow.

The Bernoulli equation states that the total energy of a fluid flowing through a streamline is constant along that streamline, neglecting any external forces such as friction or heat transfer.

The Bernoulli equation can be written as:

P + 1/2 * ρ * \(v^2\) + ρ * g * h = constant

where P is the pressure of the fluid, ρ is the density of the fluid, v is the velocity of the fluid, g is the acceleration due to gravity, and h is the height above a reference level.

The equation shows that the total energy per unit volume of the fluid consists of three terms: the pressure energy (P), the kinetic energy (1/2 * ρ * \(v^2\)), and the potential energy due to elevation (ρ * g * h).

As fluid flows, it experiences changes in velocity and pressure. According to the Bernoulli equation, if the velocity of the fluid increases, the pressure decreases and vice versa. This relationship is often referred to as the Bernoulli principle.

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The sun only appear to pass through the constellations of the zodiac because Over the course of a year, the sun appears to be in front of, or “in”, different constellations due to its orbit .

A group of stars that can be identified with the shape of an identifiable object like an animal or a known object is called a constellation. Major constellations are the Ursa Major, Ursa Minor and Cassiopeia.

Its motion is entirely an illusion, caused by Earth's own motion around our star. Over the course of a year, the sun appears to be in front of, or “in”, different constellations. One month, the sun appears in Gemini; the next month, in Cancer.

If we wanted to (and were endowed with supernatural powers), we could alter Earth's orbit so that the Sun appears to move through other constellations. Neither Lupus nor Lyra can be zodiac constellations, however, because the Sun doesn't "move through them."

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Answer:

It's an example of velocity.

A photon is a tiny particle made up of electromagnetic radiation waves. Photons are simply electric fields traveling through space, as demonstrated by Maxwell. Let the number of photons N.

the surface: F = N (h/λ)

Therefore on the surface: F = N (h/λ)

Given F = 4.6 nN

assume λ = 633 nm

N = (4.6 ×\(10^{-9}\) × 633 ×\(10^{-9}\) )/(6.63 × \(10^{-34}\))  photons / s

N = 4.68 × \(10^{18}\) photons / s

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distance = speed x time.

In this case, the distance is 300 km, the speed of the plane relative to the ground is the vector sum of its own speed and the wind speed, which is:

(4.5 x 102 km/h) - (3.2 x 102 km/h)

 = 1.3 x 102 km/h.

Therefore,

time = distance / speed

       = 300 km / (1.3 x 102 km/h)

       = 230 s or 3.83 minutes.

2. To find the apparent velocity of the spy when viewed by an observer on a stationary submarine, you can use the formula:

velocity = relative velocity + velocity of the observer.

In this case, the relative velocity of the spy is 3.0 m/s and the velocity of the observer is -20.0 m/s (negative because the aircraft carrier is moving in the opposite direction of the submarine).

Therefore,

velocity = 3.0 m/s + (-20.0 m/s)

 velocity = -17.0 m/s

3. To find the time it takes for the dolphin to catch the fish, you can use the formula:

time = distance / (speed of the dolphin - speed of the fish).

In this case, the distance is 50.0 m, the speed of the dolphin is 37.0 km/h, and the speed of the fish is 15.0 km/h.

Therefore,

time = 50.0 m / ((37.0 km/h) - (15.0 km/h))

        = 50.0 m / 22.0 km/h

time = 2.27 s.

4. To find the velocity of the dog relative to the road, you can use the principle of relative velocity. The velocity of the dog relative to the road is the vector sum of its velocity relative to the vehicle and the velocity of the vehicle relative to the road. The velocity of the vehicle relative to the road is 30.0 m/s north and the velocity of the dog relative to the vehicle is 2.00 m/s at an angle of 45 degrees east of north.

Therefore, velocity of the dog relative to the road is:

(2.00 m/s * cos(45)) m/s north + (2.00 m/s * sin(45)) m/s east

= 1.41 m/s north + 1.41 m/s east.

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No machine is perfect because some part of the work done on a machine is always used up or wasted in overcoming the friction between the moving parts of the machine. If a machine is 80% of the work input to the machine is obtained as the useful work output.

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Answer:

I guess rinse it out and wipe it up. It's not a hazardous substance so there's nothing to worry about.

These substances should be cleaned up rinsing the area or removing the compounds with a cloth and dispose of it in the trash.

Sugar is a chemical compound also called sucrose. Its chemical formula is C12H22O11. This compound is normally used to sweeten foods.

On the other hand, common salt is a chemical compound. Its chemical formula is NaCl. This compound is normally used to give food a salty taste.

According to the above, in which a student spilled some salt and sugar in the sink and does not know how to clean it, it can be concluded that the proper way to clean these chemical compounds is by rinsing the area or removing the compounds with a cloth and dispose of it in the trash because neither of them represents biological, chemical or physical risks and a specialized treatment is not required for them.

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We are given that A uniform 240-g meter stick can be balanced by a 240−g weight placed at the 100−cm mark. We have to determine the correct location of the fulcrum.

Let us assume that the location of the fulcrum be x cm away from the 100-cm mark.Now, as per the given statement, both sides of the meter stick must be balanced.We know that the product of the force and the distance from the fulcrum to the force is constant on each side of the fulcrum.Force × Distance from the fulcrum to the force = ConstantLet the fulcrum be placed at the point marked as x cm from the 100-cm mark.∴ (240 g) (100 cm − x cm) = (240 g) (x cm)10000 − 240x = 240x240x + 240x = 10000x = 10000/480x = 20.8333 cm

Thus, the correct answer is 100 cm - x = 100 cm - 20.8333 cm = 79.1667 cm≈ 75 cm

Hence, option c is the correct answer.

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The resultant displacement of  Matsushima is 330.72 miles.

The resultant displacement of an object is the change in the position of the object. It can also be described as the shortest path connecting the initial position and final position of an object.

The resultant displacement of  Matsushima is calculated by applying parallelogram law of vector addition as shown below.

d² = a² + b² - 2ab cos(θ)

where;

Substitute the given parameters and solve for the resultant displacement of  Matsushima as shown below.

d² = (250)² + (125)² - 2(250 x 125) cos(120)

d² = 109,375

d = √109,375

d = 330.72 mi

Thus, the resultant displacement of Matsushima depends on the initial position, final position and angle between the two position as shown in the parallelogram law of vector additions.

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The image will be formed at a distance of 1.95 m from the lens if the height of the object is 2.02 cm and it is placed at a distance of 1.45 m from a lens of focal length 1.02 m and refractive index 1.56.


To solve this problem, we can use the thin lens equation:
1/f = 1/do + 1/di
where f is the focal length of the lens, do is the distance of the object from the lens, and di is the distance of the image from the lens.
First, we need to convert the height of the object from cm to m:
2.02 cm = 0.0202 m
Next, we can plug in the given values:
1/1.02 = 1/1.45 + 1/di
Solving for di, we get:
di = 1.95 m
Therefore, the image will be formed at a distance of 1.95 m from the lens.

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Answer:

84 joules

Explanation:

potential energy = mgh

5.24×1.63×9.8

= 84 joules

Electric Current:

Electric current is the flow of charge through a given circuit per unit time. Electric current is one of the components needed to calculate the electric power that a device needs to operate and do work. Electric current is measured in amperes (A), which is equal to:

            1A = 1 C/ s

Recall that the coulomb (C) is the unit for charge while the second (s) is the unit for time

Given: I = 3.5

A is the current

Δt =30 s is the time interval

                     A =ΔQ/ΔT

Net charge = 100C

Electricity is produced when an electric current runs through a circuit.

How does electric current work?

A current of electricity is a steady flow of electrons. When electrons move from one place to another, round a circuit, they carry electrical energy from place to place like marching ants carrying leaves. Instead of carrying leaves, electrons carry a tiny amount of electric charge.

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Science does not  work when every one does the same thing, some creative thinking will be major breakthroughs for an invention. Therefore, option B is correct.

So how do researchers come up with those particular questions to look into ! It may come as a shock to learn how much imagination is required for the procedure.

Peter Medawar, a Nobel Prize-winning biologist, once described scientific inquiry as "the art of the soluble"  In order to succeed in science, one must first identify the questions that may be answered by scientific study and then determine the answers to those questions, according to Medawar.

Because of how intricate the natural world is, it is frequently impossible to directly address the really intriguing, significant scientific topics

The art of science includes repeatedly re-imagining these complex issues, mentally dividing them into more manageable components, and then guessing as to which of these more manageable components might hold the answer to solving the larger issue.

Therefore, all the discoveries and inventions are resulted from the creative ideas and thoughts of scientists. Therefore, creativity is the only way to make a controlled experiment.

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Answer:

d

Explanation:

==>  The total mass resting on the table is (5 kg + 3 kg) = 8 kg.

==>  The total weight of that mass is (8 kg) x (9.8 m/s) = 78.4 newtons

==>  The boxes are stacked.  So the table doesn't know if the weight on it is coming from one box, 2 boxes, 3 boxes, or 100 boxes in a stack.  The table only knows that there is a downward force of 78.4 newtons on it.

==>  The table stands in a Physics classroom, and it soaks up everything it hears there.  It knows that every action produces an equal and opposite reaction, and that forces always occur in pairs.  

Ever since the day it was only a pile of lumber out behind the hardware store in the rain, the table has known that in order to maintain the good  reputation of tables all over the world, it must resist the weight of anything placed upon it with an identical upward force.  This is the normal thing for all good tables to do, up to the ultimate structural limit of their materials and construction, and it is known as the "normal force".

So the table in your question provides a normal force of 78.4 newtons. (d)

Answer:

Uniform circular motion

Explanation:

When a car is moving with constant speed along a curve, it will said to have uniform circular motion. The speed of the car remains constant in this case. But its velocity keeps on changing. The velocity can be calculated by drawing the tangent on the circle. Hence, the motion of the car is uniform circular motion.

Answer:

Uniform motion

Explanation:

The motion when a car is moving with constant speed along a curve is an example of uniform motion.

A car moving at constant speed covers equal distances in equal intervals of time. The average speed remains the same in uniform motion.

The curve defines the path of the motion and the speed remains constant.

In order to successfully train for a marathon, Jamar will need to focus on building his slow twitch fibers. These are the muscle fibers that are responsible for endurance activities, like long-distance running. Slow twitch fibers have a high capacity for aerobic energy production.

Fast twitch fibers, on the other hand, are better suited for short bursts of intense activity, like sprinting or weightlifting. These fibers have a high capacity for anaerobic energy production, which means they can produce energy quickly but fatigue more quickly as well.

While Jamar may want to build some fast twitch fibers to help with speed and power, the majority of his training should focus on building his slow twitch fibers. This can be achieved through a combination of endurance training, such as long-distance runs, and strength training exercises that specifically target the slow twitch fibers, like bodyweight squats and lunges.

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The electric field strength midway between the plates is 100 V/m.

The electric field strength experienced by the charge is the force per unit charge flowing in the field.

The electric field strength midway between the plates is calculated as follows;

E = V/d

where;

Midway between the plates = 12 cm = 0.12 m

E = 12/0.12

E = 100 V/m

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Answer:

1 deg C = 5/9 deg F         (Ex. 212 F - 32) * 5/9 = 100

So deg F = 9/5 deg C = 9/5 * 2.9 = 5.2 deg F

Answer:

This question appear incomplete

Explanation:

This question appear incomplete because of the absence of options but when you slam on the brakes when riding a bike or other vehicles, the bike undergoes deceleration. Deceleration is a type of acceleration with a negative value which usually points in the opposite direction of the velocity. As described in the question, deceleration is usually brought about by a decrease in magnitude of a velocity.