22. сс Peter exerts a horizontal force of 500 N on a box of mass 2.0 kg which also experiences a friction force of 200 N. If it takes 4.0 s to move the box 3.0 m, what is the efficiency in moving the box? Efficiency 2 Energy coming in energy going X 100 %. (c) ABUD 29% 40% 60% 71% FH301/P1/19 ont.​

Answer:

well....to every direction the body moves towards the force exerted is conducted in the opposite direction of motion.....when it turns around force exerted is not opposite but rather non directional...

ohm's law is a formula used to calculate the relationship between voltage, current, and resistance in an electrical circuit. To students of electronics, ohm's law (e =ir) is as fundamentally important as einstein's relativity equation ( e= mc2) is to physicists. e = l x r. rest is on Goo gle

Answer:

C. 18 s

&

B. -7 m

Explanation:

A. 12 m/s, East is a vector. It says "East" so it would be a vector. Therefore this is not our answer since it's a vector and the question is asking for which one is not a vector.

B. It says "7 m". I think that means 7 meters. That's a length. There is no direction. It's not 7 meters up, or to the east, or north. So, with no direction, it's not a vector. Therefore this is not our answer.

C. For this one it says ""18 s". I think that means "18 seconds". Since this one is not mentioned "direction" meaning it's not a vector. Since the question is asking for the ones that are not a vector this would be another answer.

D. Since this one says "miles" it means it has a direction since it has a direction it is probably a vector, since it's a vector it wouldn't be our answer. Therefore this is not our answer.

The electric force acting on a 7.80 nc charge that is located 1.69 m from a 4.54 nc point charge is: 1.115*10^-7 N

To solve this exercise the electric force formula and the procedure we will use is:

F = (k * q1 * q2)/r²

Where:

Information about the problem:

By converting the the values of the charges (q1) and (q2) from (nC) to (C) and we have that:

q1= 7.80 nC * 1 C/ 1*10^ 9 nC

q1= 7.8*10^ -9 C

q2= 4.54 nC * 1 C/ 1*10^ 9 nC

q2= 4.54 *10^ -9 C

We apply the electric force formula we have:

F = (k * q1 * q2)/r²

F = [(9 *10^9 N*m²/C² * (7.8*10^ -9 C) * (4.54 *10^ -9 C)]/ (1.69 m)²

F = 3.187*10^-7 N*m² /2.8561 m²

F = 1.115*10^-7 N

In physics the electric force is the force that attracts or repels two charges (q) separated at a distance called (r), this is expressed in the international system of units in Newton.

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The statement that best explains why the system looses energy is; the Collison of the molecules of hydrogen with the wall of the can carries off energy to the environment.

We know that energy is defined as the rate of doing work. Now the temperature of a gas is measure of the kinetic energy of the molecules of the body. In this case, the temperature of the hydrogen in the cannister has to do with how fast the molecules of the hydrogen are moving.

The higher the temperature, the faster the molecules of the hydrogen move. The lower the temperature, the slower the molecules of the hydrogen moves.

As such, the molecules collide with the walls of the canister, causing the canister molecules to vibrate and carry energy from the canister to the canister’s surroundings.

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The distance covered will  be 0.301m.

firstly we will new to calculate acceleration (a).

we can do so using newtons first law of motion.

v=u + a × t

where

a is the acceleration

t is the time

from here we get

a=(v-u)/t

a=(4-0)/0.15

a=26.67m/s²

using newtons second law of motion

s=u.t+1/2at²

where s is distance travelled in t seconds.

we get,

s=0.301m

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On doubling the Amplitude both wavelength and wave speed remains unchanged.

We have a Oscillator whose amplitude is Doubled.

We have to determine the affect of variation in amplitude on wavelength and wave speed.

According to the question, we have -

Initial Amplitude → A

Final Amplitude → 2A

On doubling the Amplitude both wavelength and wave speed remains unchanged. Wavelength is not dependent on Amplitude. It can only be changed by changing its frequency or time period. Wave speed is not dependent on Amplitude. It can only be changed by changing the properties of the string through which the wave is travelling.

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A vector with magnitude 8 points in a direction 70 degrees counterclockwise from the positive x axis, the vector component form 11.53.

In Physics, greatness is characterized as the most extreme degree of size and the heading of an item. Extent is utilized as a typical calculate vector and scalar quantities. The size of a seismic tremor is characterized regarding length, expansiveness and width. It is estimated as the actual size of the tremor. A seismic tremor is considered to have a solitary extent. Greatness by and large alludes to the amount or distance. Corresponding to the development, we can associate greatness with the size and speed of the article while voyaging. The size of the article or the sum is its extent. extent for the most part alludes to distance or amount. Corresponding to development, extent alludes to the size of an article or its speed while voyaging. Speed is a scalar property in material science, and that implies that it just depicts the size, or speed, of an item, and doesn't specify the bearing that the article ventures.

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The vertical magnetic field is required to keep the rod moving at a constant speed is 0.04T.

A magnetic field, an electric current, a fluctuating electric field, or a vector field around a magnet can all be used to observe magnetic forces. Permanent magnets, including magnetic compass needles, point in the direction of magnetic fields similar to those on Earth. Magnetic fields cause electrically charged particles to move in a helical or circular pattern. This force, which is imparted to electric currents in wires in a magnetic field, is what drives the functioning of electric motors. When the magnetic field surrounds a permanent magnet or a wire carrying a steady electric current in one direction, it is referred to as a magnetostatic field and is stationary.

Calculations:

Given mass of rod ,m=0.2kg

current carrying= I = 10A

Separation between rails =d = 0.5m

coefficient of kinetic friction ,uk= 0.1

The force of magnetic field (F) is perp.r to the magnetic field.

Let required magnetic field be B.

Now balancing forces in y-direction,

        N=mg

And. in x-direction,

        F=f

       IBd= [tex]u_{k}[/tex]N

       IBd=[tex]u_{k}[/tex]mg

       B=[tex]\frac{0.1x0.2x10}{10x0.5}[/tex]

      B= 0.04T

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Electron and proton have charge which is option (a) and (c) .

As electron and proton have charges -e and +e respectively and photon has no charge.

Therefore, only electron and proton have charge not photon .

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Several narrow tree rings in a row tell us that it was formed in the warm season.

Trees are those plants that grow very tall. We can see that ancient trees play an important role in the determination of the age of some fossils. The patterns of the rings that could be found in these trees also help us to know how old the particular tree is and especially the whether condition of the place around the time that the tree was formed.

This has been corroborated by a lot of biological evidences that show to tat effect. It can also tell us about the weather condition in a place at a particular time.

As such,  several narrow tree rings in a row tell us that it was formed in the warm season.

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Answer:

index fossil, any animal or plant preserved in the rock record of the Earth that is characteristic of a particular span of geologic time or environment. A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time. Index fossils are the basis for defining boundaries in the geologic time scale and for the correlation of strata. In marine strata, index fossils that are commonly used include the single-celled Protista with hard body parts and larger forms such as ammonoids. In terrestrial sediments of the Cenozoic Era, which began about 65.5 million years ago, mammals are widely used to date deposits. All of these animal forms have hard body parts, such as shells, bones, and teeth, and evolved rapidly.

Explanation:

The magnitude of Magnetic field is 37.7 x [tex]10^{-4}[/tex] Tesla.

We have Hall Probe to measure an unknown Magnetic field.

We have to determine the Magnitude of the unknown Magnetic field.

A  Hall probe is a device that can be used to measure magnetic fields. They work on the principle of Hall effect.

According to the question, we have -

I = 120 mA = 120 x 0.001 = 0.12 Ampere.

B = 0.08 Tesla

V(H) = 0.7 [tex]\mu[/tex]V = 7 x [tex]10^{-7}[/tex]

The formula relating the above quantities is -

V(H) =  [tex]A_{H} \frac{IB}{d}[/tex]

[tex]$\frac{d}{A_{H} } =\frac{IB}{V_{H} }= \frac{0.12 \times 0.08}{7\times 10^{-7} }[/tex] = 13.71 x [tex]10^{3}[/tex]

Now -

For → V = 0.33 [tex]\mu[/tex]V =  0.33 x [tex]10^{-7}[/tex]

[tex]B=\frac{Vd}{A_{H}I }[/tex] = [tex]13.71\times 10^{3} \times\frac{0.33\times 10^{-7} }{0.12}[/tex] = 37.7 x [tex]10^{-4}[/tex] Tesla

Hence, the magnitude of Magnetic field is 37.7 x [tex]10^{-4}[/tex] Tesla.

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w = wavelength = h / mv

Where h = Planck’s constant = [tex]6.626*10^{-34} J s[/tex]

m = mass of golf ball = 45.9 g = [tex]45.9*10^{-3} Kg[/tex]

v = velocity of ball = 72.0 m/s

Hence, w = ([tex]6.626*10^{-34}[/tex]) / ( [tex]45.9*10^{-3}*72[/tex])

wavelength = [tex]2.0*10^{-34} m[/tex]

The distance over which a periodic wave's shape repeats is known as the wavelength in physics. Along with other spatial wave patterns, it is a characteristic of both traveling and standing waves. The distance between two adjacent crests, troughs, or zero crossings on the wave that correspond to successively in the same phase. The spatial frequency is the reciprocal of wavelength. The Greek letter lambda (λ) is frequently used to represent wavelength. The term wavelength is also occasionally used to refer to modulated waves, their sinusoidal envelopes, or waves created by the interference of several sinusoids. A spectrum is the term used to describe the range of wavelengths or frequencies for wave phenomena. The term was originally used to describe the electromagnetic spectrum, but it is now now used to describe the sound spectrum and vibration spectrum.

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The shock wave from the meteoroid in the lower atmosphere has a Mach angle of 0.948°.

(a) The meteoroid's speed [tex]v_s=20 \mathrm{~km} / \mathrm{s}[/tex]

[tex]$=20 \times 10^3 \mathrm{~m} / \mathrm{s}$[/tex]

Air sound wave speed [tex]&v=331 \mathrm{~m} / \mathrm{s} \\[/tex]

Speed of the shock wave in Mach [tex]&\qquad \theta=\sin ^{-1}\left(\frac{v}{v_s}\right)[/tex]

                                                            [tex]$$\begin{aligned}&=\sin ^{-1}\left(\frac{331 \mathrm{~m} / \mathrm{s}}{20 \times 10^3 \mathrm{~m} / \mathrm{s}}\right) \\&=0.948^{\circ}\end{aligned}$$[/tex]

Hence, 0.948° is the Mach angle of the shock wave from the meteoroid in the lower atmosphere.

A meteoroid's speed can be loosely broken down into three categories: slow, medium, and fast.

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The maximum torque acting on the rotor is 1.2× 10⁻⁴ Nm.

To find the maximum torque, the given values are,

No .of turns of the wire = 80

Dimensions is given as, 2.50 cm by 4.00 cm

Magnetic field = 0.800 T.

current = 10 mA.

Angular speed = 3.60 ×10³ rev/min

As the torque is in the current carrying loop in the uniform magnetic field,

τ = NIAB sinθ Nm

   = 80×10×10⁻³×0.0250×0.040×0.800× Sin 90°

   = 2 × 6.4 × 10 ⁻⁴

   = 1.2 × 10⁻⁴ Nm.

Thus, the maximum torque acting on the rotor is 1.2× 10⁻⁴ Nm.

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The total electric flux through the cylinder is 6.46N⋅m^2/C

Given data:

• The length of the charge is l=  7m.

• The charge is q = 2μC..

• The radius the cylinder is r = 10 cm

The expression for the electric flux is given as,

ϕ=2πrLE

ϕ=2πrL(2kλ/r)

ϕ=4πkλL

Substitute the value in the above equation,

ϕ=4π(9×10^9N⋅m^2/C^2)(2×10^−6C/7m)(0.02m)

= 6.46N⋅m^2/C

An electric charge is the property of matter where it has more or fewer electrons than protons in its atoms. Electrons carry a negative charge and protons carry a positive charge. Matter is positively charged if it contains more protons than electrons, and negatively charged if it contains more electrons than protons.

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The barometric pressure (BARO) sensor works in conjunction with the manifold absolute pressure (MAP) sensor to provide constant pressure difference information to the PCM.

The Manifold Absolute pressure (MAP) sensor is used by the Powertrain Control Module (PCM) for engine load entry. The PCM makes use of this input, as well as others, to calculate the correct quantity of gasoline to inject into the cylinders. The MAP sensor measures the absolute strain within the intake manifold of the engine.

Barometric pressure is the size of air strain in the atmosphere, in particular the size of the load exerted by way of air molecules at a given point on this planet.

The Manifold Absolute pressure sensor performs 'double obligation' as a barometric stress sensor as soon because the key's turned on. With the key became on (prior to the engine starting) there is no vacuum inside the engine applied to the MAP sensor therefore its sign to the ECM will become a BARO studying useful in determining air density.

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According to the question: The efficiency of the speaker is 0.428%.

The quantity of energy that is transported or transformed through time is referred to as power in physics. One joule per second, or one watt, is the definition of power in the International System of Units. Power is referred to as acting in some ancient writings. A motor's output power is the result of the torque it produces and the angular velocity of its output shaft.

Explanation:

Power output, P₀ = 0.643W

Power input, P₁ = 150W

The efficiency of the speaker = P₀/P₁

                                                  = 0.643W/150W

                                                  = 0.00428 ≅ 0.428%

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voltage drop can occur both the high current and control circuits.

Voltage drop - it is the loss of voltage by caused by the flowing current through resistance.

As any length of wires will have resistance running a current through the direct circuit resistance will cause the voltage drop.

It occurs voltage at the end point is less then the starting point.

control circuits - The circuit which carries only the electric signals directing performance of control device not power that device controls.

voltage drop can occur across both the high-current and control circuits; however, the control circuit is more susceptible to voltage drop due to the much larger amount of current flowing in the circuit.

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The distance between the cliffs is 833.4m.

A cliff is a section of rock with an overall angle defined by the vertical or nearly vertical in geography and geology. Cliffs are created by the gravitational effects of weathering, erosion, and other activities. Cliffs can be seen on rivers, escarpments, steep terrain, and coastlines. Typically, cliffs are made of weather- and erosion-resistant rock. Sandstone, limestone, chalk, and dolomite are the sedimentary materials most likely to result in cliff formation. Cliffs are frequently formed by igneous rocks like granite and basalt.

A geologic fault's movement, a landslide, or occasionally rock slides or falling rocks that alter the differential erosion of the rock layers result in the formation of an escarpment (or scarp), a type of cliff.

Explanation:

Let x1 be the distance between the cowboy and the closer canyon wall and x2 be the distance between him and the farther cliff. The first echo's sound travels a distance of 2x1. 2x2 for the following. The third is

2x1 + 2x2 , for the fourth echo  2x1 + 2x2 + 2x1

speed of sound =  343 m/s

then,

diff  of length  =  2x2 - 2x1 / 343 = 1.92 s

and 2x1 + 2x2 - 2x2 / 343 = 1.47

x1 = 0.5 * 343 * 1.47

= 252.105 m

2x2 / 343 = 1.92 + 1.47

x2 = 581.3 m

a) x1 + x2  =  581.3 + 252.105  =  833.4

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The final velocity of the ball when it is caught is 20.58 m/s

Velocity is the rate of change of displacement.

To calculate the final velocity of the ball when it is caught, we use the formula below.

Formula:

Where:

From the question,

Given:

SUbstitute these values into equation 1

Hence, the  final velocity of the ball when it is caught is 20.58 m/s

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Answer:

this problem we have to draw a velocity-time graph for an object travelling initially at -3 m/s, then slowing down and turning around.

In the graph, we see that the initial velocity at time t = 0 is

v_0 = -3 m/sv

0

=−3m/s

and it is negative, so below the x-axis.

Later, the object slows down: this means that the magnitude of its velocity increases, therefore (since the velocity is negative) the curve must go upward, approaching and reaching the x-axis (which corresponds to zero velocity).

After that, the object's velocity keep increasing, but now it is positive: this means that the object is travelling in a direction opposite to the initial direction, so it has turned around.

Explanation:

I can't draw sorry

Change in length in meters is 0.21 m

volume is given by

 [tex]V_{f} = lwh\\[/tex]

v = volume  [tex]V_{f}[/tex] = Final  volume , [tex]V_{i}[/tex] = initial volume

l = length

w = width

h = height

change in volume expansion,

[tex]V = \beta V_{i} T[/tex]

where

t = change in temperature

[tex]\beta[/tex] = coefficient of volume expansion

coefficient of volumetric expression defined as increasing volume per unit, original volume per Kelvin rising temperature.

[tex]\beta \\[/tex] = 210×10⁻⁶ C⁻¹

[tex]V_{i} = lwh_{i}[/tex]  

[tex]V_{f} - V_{i} = \beta V_{i}T[/tex]

on solving we get,

[tex]h_{f} =[/tex] 210×10⁻⁶ × 1 + 1000 = 1000.21m

Change in length=  [tex]h_{f} -h_{i}[/tex]  = 0.21 m

Change in length in meters is 0.21 m

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The water in the Cuyahoga river flows at a speed of 5.4 kilometers/hour. If you decide to canoe down the river a distance of 16 kilometers, then it would take 2.96 hours.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.

As given in the problem, the water in the Cuyahoga river flows at a speed of 5.4 kilometers/hour. If you decide to canoe down the river a distance of 16 kilometers,

The time period for canoeing 16 kilometers = 16 kilometers / 5.4 kilometers/hour

                                                                         =2.96 hours

Thus, it would take 2.96 hours to canoe down the river a distance of 16 kilometers.

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The torque acting on the loop will be zero .

The diagram is given below.

From the diagram ,  vector of the loop and therefore the force field  are parallel to every different which suggests sin 180 ° whose worth is zero.

On putting the value of sin180 in equation (1) , we get

[tex]T=NIAB\times0\\T=0[/tex]

Torque acting on the loop will be zero .

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75km=75000m

35min=2100 seconds

Velocity=Displacement/Time

=75000/2100

=750/21

=35.71 m/s