if you are pushing a box with a force of 200n and there is a force of 7 n on the box due to sliding friction, what is the net force on the box​

Answer:

The atomic particles given off as a result of nuclear fission are alpha and beta.

Explanation:

Answer: positive terminal

Explanation: A voltmeter reading is a process of measuring electic potentials in volts with voltmeter. A positive terminal is the terminal of a battery or other voltage source toward which electrons flow through the external circuit.

Answer:

The ice skater will spin at an angular speed of 7.5 revolutions per second.

Explanation:

From statement we notice that ice skater can be considered as a system, on which no external forces are exerted, such that Principle of Angular Momentum can be applied:

[tex]I_{1}\cdot \omega_{1} = I_{2}\cdot \omega_{2}[/tex] (Eq. 1)

Where:

[tex]I_{1}[/tex] - Moment of inertia of the ice skater when her arms are outstretched, measured in kilogram-square meters.

[tex]\omega_{1}[/tex] - Angular speed when arms are outstretched, measured in revolutions per second.

[tex]I_{2}[/tex] - Moment of inertial of the ice skater when her arms are pulled, measured in kilogram-square meters.

[tex]\omega_{2}[/tex] - Angular speed when arms are pulled, measured in revolutions per second.

If [tex]I_{1} = 5\,kg\cdot m^{2}[/tex], [tex]\omega_{1} = 3\,\frac{rev}{s}[/tex] and [tex]I_{2} = 2\,kg\cdot m^{2}[/tex], the angular speed when arms are pulled is:

[tex]\omega_{2} = \frac{I_{1}}{I_{2}} \cdot \omega_{1}[/tex]

[tex]\omega_{2} = \left(\frac{5\,kg\cdot m^{2}}{2\,kg\cdot m^{2}} \right)\cdot \left(3\,\frac{rev}{s} \right)[/tex]

[tex]\omega_{2} = 7.5\,\frac{rev}{s}[/tex]

The ice skater will spin at an angular speed of 7.5 revolutions per second.

Answer:

4.2 m/s2

Explanation:

By using Newton's second law, the cart's acceleration is 4.2 m/[tex]s^{2}[/tex]

Given that a spring scale is used to exert a net force of 2.7 N on a cart.

If the cart's mass is 0.64 kg, then, we can use Newton's second law to solve the question.

F = ma

Force F = 2.7 N

Mass m = 0.64 kg

Acceleration a = ?

Substitute all the parameters into the formula

2.7 = 0.64a

a = 2.7/0.64

a = 4.2 m/[tex]s^{2}[/tex]

Therefore, the cart's acceleration is 4.2 m/[tex]s^{2}[/tex]

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Answer:

A. Particle model.

Explanation:

The photoelectric effect describes when light shines on a piece of metal, and the metal releases electrons. The model of light behavior which best helps to explain this effect is the particle model. According to Isaac Newton, he postulated that light consists of little (tiny) particles which typically travels in a straight line and from his experimental investigation he observed that white light comprises of a mixture of colors.

Sir Newton observed that, when light shines on a piece of metal, the metal releases electrons because the energy of the tiny light particles are greater than the binding energy of the electrons residing in the metal. This theory is known as the particle model of light.

GREETINGS!

For Horizontal Distance formula is,

                               [tex]R = \frac{V_{o} ^2}{g} Sin2[/tex] θ

where,

            R is range or horizontal distance

            [tex]V_{o}[/tex] is initial velocity

            g is acceleration due to gravity

            θ is the angel it makes

so,

    by putting the initial velocity and EACH ANGEL that is given in the data,

we will get range respectively,

for 31 degree = 565m

for 89 degrees= 22m

for 17 degrees = 357.88m

for 49 degrees = 633.77m

for 40 degrees = 630.27m

for 78 degrees = 260.3 m

SO FROM SHORTEST TO LONGEST IS,

89 degrees i.e. 22m , 78 degrees i.e. 260.3 m, 17 degrees i.e. 357.88m, 40 degrees i.e. 630.27m, 49 degrees i.e. 633.77m

I HOPE IT HELPS YOU :)

Answer:

The stopping distance for the car when the driver slams on her brakes is 7.38 m.

Explanation:

The distance traveled for the car after stopping can be found using the following equation:

[tex] v_{f}^{2} = v_{0}^{2} + 2ad [/tex]

Where:

vf is the final speed = 0 (it stops)

v₀ is the initial speed = 11 m/s

a is the acceleration = -8.2 m/s²

d is the distance =?

When the driver slams on her brakes the distance traveled is:

[tex]d = -\frac{v_{0}^{2}}{2a} = -\frac{(11 m/s)^{2}}{2*(-8.2 m/s^{2})} = 7.38 m[/tex]

Therefore, the stopping distance for the car when the driver slams on her brakes is 7.38 m.

I hope it helps you!                                        

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

Explanation:

The largest face of this rectangular block is 2*3 = 6 square meters. You simply pick the two largest sides and multiply them to get the largest area.

Pressure is defined as the force divided by area. The larger the area gets, the smaller the pressure will be. This is because the pressure is spread out over more area to reduce the per square unit pressure amount.

The block is 60 kg and the acceleration of gravity is roughly 10 m/s^2

So the force pulling down on the block is roughly 60*10 = 600 newtons.

Now we can find the pressure

P = pressure = unknown

F = force = 600 N

A = area = 6 square m

P = F/A

P = (600 N)/(6 m^2)

P = 100 (N/m^2)

P = 100 pa

Where "pa" stands for the unit "pascals", which is one unit for pressure.

--------------

Note what happens when we make A as small as possible. That happens with the 1 by 2 side, so the area is A = 1*2 = 2, and we get

P = F/A = 600/2 = 300 pascals

Reducing A enlarges P. Consequently, minimizing A leads to maximizing P. So the max pressure occurs on the face that is 1 m by 2 m.

Answer:

Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles.

Explanation:

Answer:

The molecules of a gas move apart when they collide. The average kinetic energy of the particles in a liquid (or solid) is small enough that the forces of attraction between them is sufficient to hold the particles close together. The molecules in a liquid (or solid) do not move apart.

Explanation:

Gas – In a gas, particles are in continual straight-line motion. The kinetic energy of the molecule is greater than the attractive force between them, thus they are much farther apart and move freely of each other. In most cases, there are essentially no attractive forces between particles.

Answer:

Explanation:

Time during which there was acceleration = (v - u)  / a = 5 / 1.5 = 3.33 s

Time during which there was deceleration = (v - u)  / a = 5 / 2 = 2.5 s

Distance travelled during acceleration = 1 /2 a x t² = 1/2 x 1.5 x 3.33²

= 8.32 m

Distance travelled during deceleration = 1 /2 a x t² = 1/2 x 2 x 2.5²

= 6.25 m

Total distance travelled = 400 m

distance travelled when the velocity was uniform = 400 - ( 6.25 + 8.32 )

= 385.43 m

uniform velocity = 5 m /s

time  during uniform velocity existed

= 385.43 / 5 = 77.1 s

Total time required in the journey = 77.1 + 3.33 + 2.5

= 82.93 s

Answer:

Explanation:

Using the equation of motion

v = u+gt

v is the final velocity

u si the initial velocity

g is the acceleration due to gravity

t is the time

Substitute

0 = 4.5-(9.8)t

-4.5 = -9.8t

t = 4.5/9.8

t = 0.459s

Answer:

90.0 + 80 = 170

2 signifigant figures

1.70 x 10^2

Answer:

static electricity

Explanation:

Answer: Density

Explanation: When the fluids particles are heated, they move faster. As they move faster, the particles occupy more space, causing the density to decrease.

Answer:

A. Density

Explanation:

Answer:

A. The circuit's current drops. b. The circuit's resistance drops c. The voltage across it is zero d. The voltage remains the same.

Explanation:

a. What would happen to the circuit's current

Since the circuit is in series and one resistor is shorted, the current in the circuit would drop since it is a series circuit and one resistor has been shorted.

b. What would happen to the circuit's resistance

The resistance of the circuit drops by the value of the resistance shorted since it is a series circuit and the shorting cuts off this resistor from the circuit.

c. What would happen to the voltage across the shorted component

The voltage across the shorted component is zero because, since no current flows through it and we know that voltage V = IR and if I = 0, V = 0 × R = 0 V. So, the voltage across it is zero.

d. What would happen to the voltage across the other components

The voltage across the other components remains the same as the initial voltage because, the short transfers the current across the shorted component and makes the shorted component disappear from the circuit. The short thus makes it seem like the source voltage is directly connected to the other components across the shorted resistor. So, the new voltage across the other components is the initial voltage in the circuit before the short.

Answer:

She will be at 49m from her starting point in 7s

Explanation:

V = AT    2s V = 2*2 = 4m/s    7s V = = 2*7 = 14 m/s

D = 1/2AT^2  for 7 sec = 1/2*2 m/s^2 * 7s^2

    = 1/2*2*49

    = 49m

Answer:

-9.8m/s^2 x 2.2 = -21.56m/s^2 50m/s - 21.56m/s^2 = 28.44m/s

Answer:

C

Explanation:

Given that a 2455 kg car was pushed by 77 kg student with a force of 720 N.

According to Newton's third law of motion which state that in every action, there will be equal and opposite reaction.

The action on the car = 720 N

The reaction from the car = - 720 N

Therefore, the force the car will apply on the student will be -720N.

The correct answer is C

Answer:

The answer is "52.61 ft/s"

Explanation:

Taking the motion in the z-direction is [tex]u_z = 32 , \ \ a_z = - 32[/tex]

[tex]t = 2 \frac{u_z}{( - a_z )}\\\\[/tex]

  [tex]= 2 \times \frac{32}{32}\\\\ = 2 \ sec\\\\[/tex]

z-axis change is zero z and the  x-path the same way:

[tex]= u_x t + \frac{1}{2} a_x t^2 \\\\= 40 \times 2 + 0.5 \times 0 \times 2^2 \\\\ = 40 \times 2 + 0.5 \times 0 \times 4 \\\\ = 80 +0\\\\= 80 \ ft \ \ i[/tex]

In y-direction:

[tex]= 0 \times t - \frac{1}{2} \times (6) \times 2^2\\\\ = - \frac{1}{2} \times (6) \times 4\\\\ = - (6) \times 2\\\\= - 12 ft \ \ j[/tex]

the ball lands at:[tex]( 80 i - 12 j + 0 k ) ft[/tex]  

Magnitude:

[tex]\to ( 80^2 + (-12)^2 )^{\frac{1}{2}}\\\\\to ( 6400 + 144 )^{\frac{1}{2}}\\\\\to ( 6544 )^{\frac{1}{2}}\\\\\to 80.89 \ ft[/tex]from the origin.

angle:

[tex]\to \tan^{-1} ( \frac{12}{80} )\\\\\to 8.53^{\circ}[/tex]

velocity:

[tex]\to 40 i + ( 0 - 6 \times 2 ) j + ( 32- 32 \times 2 ) k\\\\\to 40 i + ( - 12 ) j + ( 32- 64 ) k\\\\\to 40 i - 12 j - 32 k\\\\\to ( 40^2 + 12^2 + 32^2 )^{\frac{1}{2}}\\\\\to (1600+144+1024)^{\frac{1}{2}}\\\\\to 2768^{\frac{1}{2}}\\\\\to 52.61\ \ \frac{ft}{s}[/tex]

Answer:

Carbon (see below)

Explanation:

To identify an element on the period table, you can use its atomic number—or its number of protons.

The atomic number of an element is located in the upper left-hand corner of each square in the periodic table. Refer to IMAGE.A for more info.

If you look at the periodic table, you can spot carbon in the nonmetals.

Carbon's upper left-hand corner has a 6. Refer to IMAGE.B for more info.

Answer:

a) 102 meters

b) 14 meters

c) The direction is eastward.

Explanation:

Distance is said to be the length between two points. It is a scalar quantity.

a) The distance moved = 36 + 44 + 22

                                       = 102 meters

b) Displacement is the distance moved in a specified direction.

Representing the distance moved with specific direction as a directed number, 36 meters eastward = +36, 44 meters westward = -44, and 22 meters eastward = +22

/Displacement/ = +36 -44 +22

                         = +58-44

                         = 14

The magnitude of the displacement is 14 meters.

c) The direction is eastward.

So that the magnitude of displacement and his direction is 14 meters eastward.

Answer:

KE= energy associated with motion

PE= energy associated with position

KE example= throwing a ball (ball moving= KE), skateboarding

PE example= dropping a book (since the book is held above the ground, it has PE)(as it falls, PE is converted to KE)

Answer:

To see how well you are doing.

Explanation:

Maintaining an exercise journal helps a person keep track of progress and see firsthand if he or she is sticking to a steady exercise routine.

A fitness journal is a valuable tool that provides structure, accountability, and motivation while allowing you to track progress and make informed decisions to optimize your workouts and well-being.

Monitoring Progress: Keeping a fitness journal enables you to monitor and assess your advancement over time. You may track your progress in terms of fitness by keeping track of the exercises you do, their time, and their intensity. This keeps you motivated and reveals any areas where you might need to change your workouts to efficiently attain your goals. Setting Goals: Putting your fitness objectives in writing in a journal will help you clarify your objectives. You can plan and monitor your progress towards reaching your goals if they are clear and explicit. This helps you maintain your commitment to your fitness journey by keeping you focused and giving you a feeling of direction.

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Answer:

It would be O 18

Answer:

V = 4i^ + 2j^

Explanation:

We are given;

Velocity in the x-direction; V_x = 4 m/s

Velocity in the y-direction; V_y = 2 m/s

Now, in terms of standard basis vectors, we normally write the resultant velocity as;

V = (V_x)i^ + (V_y)j^

Thus, the resultant velocity is;

V = 4i^ + 2j^

Answer:

10 yards per second

Explanation:

Answer:

piglets

Explanation:

more than 3

Answer :pedestrian walker.

Explanation: