Albert's laboratory is filled with a constant uniform magnetic field pointing up everywhere. Into this magnetic field albert throws some charges. He throws the charges in different directions, and observes the resulting magnetic forces on them. Given the sign of each charge and the direction of its velocity, determine the direction of the magnetic force (if any) acting on the charge.
Resulting magnetic force:
Positive charge moving south:
Negative charge moving west:
Negative charge not moving at all:
Positive charge moving up:
Positive charge moving east:
Negatve charge moving down:
Negative charge moving north:
Positive charge not moving at all:
Positive charge moving west:
Negative charge moving south:
Negative charge moving east:
Positive charge moving north:
options: up, down, no force, north, south, east, west

Answer:

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Explanation:

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Answer:

it gives off a range of electromagnetic radiation of shorter wavelengths.

Explanation:

I took the test

Answer:it gives off range of electromagnetic radiation for shorter

Wavelengths

Explanation:

Answer:

-67 m/s

Explanation:

We are given that

Mass of ball,m=0.4 kg

Initial speed,u=14 m/s

Impulse,I=-32.4 N-s

Time,t=27 ms=\(27\times 10^{-3} s\)

We have to find the mass's velocity in the x- direction.

We know that

\(Impulse=mv-mu\)

Substitute the values

\(-32.4=0.4v-0.4(14)\)

\(-32.4+0.4(14)=0.4 v\)

\(-26.8=0.4v\)

\(v=\frac{-26.8}{0.4}=-67m/s\)

Answer:

50 m/s^2

Explanation:

F=ma

25 N= 0.5 kg • a

divide both sides by 0.5 kg

a=50 m/s^2

The approximate heat transfer through 1.65 cm of air with a temperature difference of 23.0 °C is approximately 24.4 J/s.

To approximate the heat transfer through the air layer in the double-paned window, we can assume that the glass layers have a negligible impact on the heat flow. The heat transfer can be calculated using Fourier's Law of Heat Conduction, which states that the heat flow (Q) is proportional to the temperature difference (ΔT) and inversely proportional to the thickness (L) and thermal conductivity (k) of the material.

First, we need to calculate the effective thermal conductivity of the air layer due to its thickness and the thermal conductivity ratio between air and glass. Let's denote the thermal conductivity of air as k_air and the thermal conductivity of glass as k_glass. Since glass has a thermal conductivity roughly 36 times greater than air, we have k_glass = 36 * k_air.

Next, we calculate the effective thermal conductivity of the air layer as:

k_eff = (k_air * L_air) / (L_air + k_glass)

Substituting the given values, we have:

k_eff = (k_air * 0.0165 m) / (0.0165 m + 0.005 m) = 0.01309 * k_air

Now, we can calculate the heat flow per second through the air layer using the formula:

Q = (k_eff * A * ΔT) / L_air

Substituting the given values, we get:

Q = (0.01309 * k_air * 0.760 m^2 * 23.0 K) / 0.0165 m = 24.4 J/s

Therefore, the approximate heat transfer through 1.65 cm of air with a temperature difference of 23.0 °C is approximately 24.4 J/s.

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1. the tire pressure monitor on your car lights up on a cold winter day

2. a balloon popping as it is taken up a mountain

Answer:

the answer is c

Explanation:

melting = become liquefied by heat

solubility = a new bond formation

conductivity = electric transmitter

flammability = burnable

THERE ARE COMMONLY THREE SYSTEMS OF UNIT. THEY ARE:-

• CGS System- (Centimeter-Gram-Second system) A metric system of measurement that uses the centimeter, gram and second for length, mass and time.

• FPS System- (Foot–Pound–Second system).

The system of units in which length is measured in foot , mass in pound and time in second is called FPS system. It is also known as British system of units.

• MKS System- (Meter-Kilogram-Second system) A metric system of measurement that uses the meter, kilogram, gram and second for length, mass and time. The units of force and energy are the "newton" and "joule."

The amount of charge that will pass through the cross-sectional area of the conductor in 1 min is 192 C.

We can use the formula Q = I * t,

where;

Given that a charge of 6.4 C passes through a cross-sectional area of the conductor in 2 s, we can find the current using the formula:

I = Q / t = 6.4 C / 2 s = 3.2 A

So, the current through the conductor is 3.2 A.

To find the amount of charge that will pass through the cross-sectional area of the conductor in 1 min (60 s), we can use the same formula:

Q = I * t = 3.2 A * 60 s = 192 C

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Answer:

Explanation:

Mica dielectric constant (k) is approximately 3. The distance between the plates is 5 mm = \(5\times10^{-3}\) m = d and the area of each plate is\(A = 0.1\times 0.2=2\times 10^{-2} m^{2}\). So, the capacitance of that capacitor is:

\(C=\frac{\epsilon_{0}kA}{d}=\frac{(8.85\times10^{-12})(3)(2\times10^{-2}}{5\times10^{-3}}=10.62\times10^{-11} =1.062\times10^{-10} F\)

or approximately 0.106 nF.

Answer:

(D) x = 93.8 m

Explanation:

v^2 = v0^2 + 2ax

(20 m/s)^2 = (5 m/s)^2 + 2(2 m/s^2)x

Solving for x,

x = 93.8 m

Answer:

8.45 m

Explanation:

From the question given above, the following data were obtained:

Mass (m) = 90 Kg

Initial velocity (u) = 13 m/s

Final velocity (v) = 0 m/s

Height (h) =?

NOTE: Acceleration due to gravity (g) = 10 m/s²

The height of the hill can be obtained as follow:

v² = u² – 2gh (since the cart is going against gravity)

0² = 13² – (2 × 10 × h)

0 = 169 – 20h

Rearrange

20h = 169

Divide both side by 20

h = 169/20

h = 8.45 m

Therefore, the height of the hill is 8.45 m

Answer:

Explanation:

We can use Hooke's law to solve this problem. Hooke's law states that the force required to extend or compress a spring by some distance x is proportional to that distance. Mathematically, this can be written as:

F = kx

where F is the force applied to the spring, x is the distance the spring is stretched or compressed, and k is the spring constant, a measure of the stiffness of the spring.

To find the spring constant, we can use the given information that a 20g weight causes an extension of 0.72cm in the spring. We can convert the weight to force using the acceleration due to gravity, g:

F = mg = (0.02 kg)(9.8 m/s^2) = 0.196 N

Now we can solve for the spring constant:

k = F/x = 0.196 N / 0.0072 m = 27.2 N/m

Finally, we can use this spring constant to find the extension caused by an 80g weight:

F = mg = (0.08 kg)(9.8 m/s^2) = 0.784 N

x = F/k = 0.784 N / 27.2 N/m = 0.0288 m

So the extension caused by an 80g weight is 0.0288 m or 2.88 cm.

A 12 kg box would require around 0.12 horsepower. However, if the lift is powered by a pulley system, the amount of power needed would be much less.

Horsepower is a unit of power that measures the amount of work done over a period of time. It is most commonly associated with engines in vehicles, but can be used to measure any kind of power. One horsepower is equal to 746 watts and is equivalent to 33,000 foot-pounds of work per minute. Horsepower is a useful measure of power because it takes into account the amount of time it takes to complete a task.

The amount of power needed to lift a 12 kg box up to a 2 meter high shelf will depend on several factors, including the type of lift being used, the weight of the box, the size of the shelf, and the speed of the lift. Generally speaking, a lift system that uses a motor to lift the box will require around 1 horsepower per 100 kg of weight. Therefore, a 12 kg box would require around 0.12 horsepower. However, if the lift is powered by a pulley system, the amount of power needed would be much less.

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Answer:

The kinetic energy will be "399.65 J".

Explanation:

Given:

Mass,

m = 1.2 kg

Velocity,

v = 31.3 m/s

The total energy of mass will be:

⇒ \(E=K+U\)

or,

⇒ \(E=.5mv^2+mgh\)

By putting the values, we get

        \(=.5(1.2)(31.3)^2+0\)

        \(=0.6\times 979.69+0\)

        \(=587.81 \ J\)

Since,

The system's total energy is unchanged, then

⇒ \(E=K+U\)

or,

⇒ \(E=K+mgh\)

   \(587.81=K+1.2(9.8)(16)\)

   \(587.81=K+188.16\)

          \(K=587.81-188.16\)                

               \(=399.65 \ J\)

Answer:d

Explanation:

I think I've done this

Answer:

A objects have zero acceleration

Explanation:

I did this on Plato and it was right

The temperature of the steam leaving the nozzle is 674.5 K, and the exit area of the nozzle is  = 704.2 / 2² mm2.

let's use the conservation of mass to find the exit-specific volume of the steam:

ℎ1 = 3297.6 kJ/kg (from steam tables at 580 K and 3 MPa)

ℎ2 = ℎ1 - 1/2

The universal gravitation law and Newton's second law allow us to find that the answer for the relation of the rotation periods of the satellites is:

       \(\frac{T_{Eu}}{T_{Io}}\)  = 2.83

The universal gravitation law states that the force between two bodies is proportional to their masses and inversely proportional to their distance squared

           \(F = G \frac{Mm}{r^2}\)

Where G is the universal gravitational constant (G = 6.67 10⁻¹¹ ), F the force, m and m the masses of the bodies and r the distance between them

Newton's second law states that force is proportional to the mass and acceleration of bodies

          F = m a

Where F is the force, m the mass and the acceleration

In this case the body are the satellites of Jupiter  planet,

            \(G \frac{Mm}{r^2} = m a\)

Suppose the motion of the satellites is circular, then the acceleration is centripetal

           a = \(\frac{v^2}{r}\)

Where v is the speed of the satellite and r the distance to the center of the planet

we substitute

      \(G \frac{Mm}{r^2} = m \frac{v^2}{r} \\G \frac{M}{r} = v^2\)

Since the speed is constant, we can use the uniform motion ratio

      v = \(\frac{\Delta x}{t}\)

In the case of a complete orbit, the time is called the period.

The distance traveled is the length of the orbit circle

           Δx = 2π r

We substitute

           \(G \frac{M}{r} = (\frac{2 \pi r}{T} )^2 \\T^2 = (\frac{4 \pi ^2}{GM}) \ r^3\)

Let's write this expression for each satellite

Io satellite

Let's call the distance from Jupiter is  

            r = \(r_{Io}\)  

Europe satellite

Distance from Jupiter  is

         \(r_{Eu} = 2 \ r_{Io}\)

We calculate

         \(T_{Eu} = ( \frac{4\pi ^2 }{GM} (2 \ r_{Io})^3\\T_{Eu} = ( \frac{4 \pi ^2 }{GM}) r_{Io} \ 8\)

         \(T_{Eu}^2 = 8 T_{Io}^2\)            

         \(\frac{ T_{Eu}}{T_{Io}} = \sqrt{8} = 2.83\)

In conclusion, using the universal gravitation law and Newton's second law, we find that the answer for the relationship of the relation periods of the satellites is:

        \(\frac{T_{Eu}}{T_{Io}} = 2.83\)

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The true facts about a fission chain reaction is that it involves the breakdown of a large nucleus into daughter nuclei when bombarded by a small particle such as a neutron. It is a self sustaining reaction.

Nuclear fission is said to have occurred when a neutron is used to bombard an unstable or fissile nucleus such that it breaks down into smaller daughter nuclei releasing tremendous energy in the process.

The reaction is self sustaining because more neutrons are produced as the fission reaction proceeds which ensures that the reaction continues.

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Answer: The number of freely moving neutrons increases over time

Explanation:

Answer:

Is when dreaming occurs

Explanation:

Rem sleep is when dreaming occurs, other stages of sleep are when beta and delta waves occur.

Answer: C

Explanation:

Given:

mass of the spike is

initial speed od the spike is

if the tie and spike together absorb 22 percent of the spike's initial kinetic energy.

Required:

calculate the increase in internal energy of the tie and spike.

Explanation:

here we apply conservation of energy.

total change in energy is zero.

here potential energy is not given so neglect that part. we have only

Here,

K1 is initial kinetic energy and K2 is final kinetic energy that is equal to zero.

now we have

we know that kinetic energy is

then

plugging all the values in the above relation. we get

Thus, the change in internal energy is

The index of refraction is 1.33.

To find the answer, we need to know about index of refraction.

What is index of refraction?

What is the mathematical expression of refractive index?

n= sin∅₁ / sin∅₂

where, ∅₁= angle of incident

             ∅₂= angle of refraction

What is the refractive index,  if the angle of incidence in air is 40 degrees and the angle of refraction is 29 degrees?

Thus, we can conclude that the index of refraction is 1.33.

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The statement that describes the transformation of the graph of function f onto the graph of function g is: The graph shifts 2 units right and 7 units down.

To determine the transformation of the graph of function f onto the graph of function g, we compare the two functions f(x) and g(x) and observe the changes in the equations.

The function f(x) = (1/x - 3) + 1 represents a reciprocal function that is shifted vertically 1 unit up and horizontally 3 units to the right. The reciprocal function is reflected about the line y = x.

The function g(x) = (1/(1 + 4)) + 3 simplifies to g(x) = 4 + 3 = 7, which is a constant function representing a horizontal line at y = 7.

By comparing the equations, we can see that the transformation from f(x) to g(x) involves the following changes:

The term 1/x in f(x) is replaced by the constant 1/(1 + 4) in g(x), resulting in a vertical shift of 7 units up.

The term -3 in f(x) is replaced by 3 in g(x), resulting in a vertical shift of 3 units up.

The +1 in f(x) is replaced by +3 in g(x), resulting in an additional vertical shift of 2 units up.

Therefore, the overall transformation is a shift of 2 units to the right and 7 units down.

Hence, the correct statement is: The graph shifts 2 units right and 7 units down.

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Answer:

VR = Velocity of effort / Velocity of Load

Explanation:

The ratio of the out-lever to the in-lever (length of the resistance arm to effort arm) is known as the velocity ratio (VR). It indicates that the distance covered by effort is four times that covered by the load.

The load-to-effort ratio of a machine, or alternatively, the output-to-input ratio of a machine, is known as its mechanical advantage. Another definition of velocity ratio is the ratio of the velocity of effort to the velocity of load.

When a machine has a force ratio of 4 and a velocity ratio of 4, this indicates that the weight moved is multiplied by 4 and the distance moved by the effort is multiplied by 4 at the same time.

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Option C. The heat absorbed or lost by a substance while it's changing state  correctly describes latent heat

Latent heat is the heat absorbed or lost by a substance while it is changing state.

The latent heat is a type of heat that is transferred during phase change, i.e., while a substance undergoes a change of state.

For example, when ice melts into liquid water, or when liquid water evaporates into water vapor, heat is absorbed from the surroundings.

Latent heat is not associated with a temperature change; rather, it's associated with a change of state.

For instance, the temperature of water remains at 100°C while boiling.

When water is boiling, the latent heat of vaporization is absorbed and utilized to break the hydrogen bonds holding water molecules together to change water from the liquid phase to the gaseous phase.

When the water is boiling, adding more heat won't increase the water's temperature, instead, the extra heat will be absorbed to change the phase of water molecules.

Therefore, the correct answer to the given question is option C: The heat absorbed or lost by a substance while it is changing state.

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The potential energy is at the maximum when you reach the top of your jump on a trampoline. The correct answer is option B.

Potential Energy is the type of energy an object possesses by virtue of its position relative to others, stresses within itself, electric charge, and other factors. Potential energy exists in various forms, including gravitational potential energy, elastic potential energy, chemical potential energy, and electrical potential energy.

This type of energy can be converted into another type of energies. Examples, a charged battery has potential energy and it can be used as electrical potential energy. Petrol, diesel and and gas have chemical potential energy and be used as kinetic energy.

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-0.5m/s^2 is the  acceleration of the car

Because we have the Initial velocity (20 m/s), the final velocity (0 m/s), and the distance traveled x=400m. we can use the kinematic equation

Vf^2= Vo^2 + 2ax,

vf will be zero.

0= Vo^2+ 2ax

Vo^2= -2ax

20^2= -2a(400)

1= -2a

a= -1/2= -0.5m/s^2

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