what is the acceleration of a car, moving along a straight line, that increases its velocity from 0 to 15 m/s in 10s?

Resistance 100

Current 4.2A

Based on the information of the last point, we know the current and now we have the resistance. With these two numbers we can calculate the drop of voltage generated by the resistance.

Is important to highlight that we asume the same current for each line because the current is constant in all the parallel lines.

ANSWER

Figure 1

EXPLANATION

We want to identify the correct force diagram acting on the object on the inclined plane.

When an object is moving on an inclined plane, there are four forces acting on it:

1. Friction force, Fr

2. Normal force, FN

3. Component of weight acting parallel to the inclined plane = Wsinθ

4. Component of weight acting perpendicular to the inclined plane = Wcosθ

Therefore, the correct option is Figure 1.

Answer:

30.5555°K

Can be rounded to 30.56°K

Explanation:

The relationship between °C and °K is
°K = °C + 273.15

To convert °F to °K, first convert °F to °C and then add 273.15

°C = (°F - 32) x 5/9

So combining the two conversions we get
°K = (°F - 32) x 5/9 + 273.15

55°F = (55-32) x 5/9 + 273.15 = 285.9278°K

110°F = (110-32) x 5/9 + 273.15 = 316.4833°K

Temperature range in Kelvin scale

= 316.4833°K - 285.9278°K = 30.5555°K

We will have that as long as the object is a conductor it will be able to have a net negative charge of 2.00*10^-9 C.

Rain falling from a cloud is not an example of energy transfer.

The given problem can be exemplified using the following diagram:

We will determine the magnitude of the force "F" that will balance the concentric wheels.

To do that we will add the torques produced by the forces. If the torque is counterclockwise we will set it a positive and if it is clockwise it will be negative.

Where:

The sum of toques adds up to zero because we want to determine the force "F" when the system is in equilibrium.

Now, we substitute the formula for the torques:

Where:

Now, we solve for the force "F":

First, we will add "Fr10" to both sides:

Now, we divide both sides by r10:

Now, we plug in the values:

Solving the operations:

Therefore, the required force is 72N.

Each pound costs $1.2 in unit pricing.

Sally notes that the price of bananas in England is £2.10/kg.

Applying the exchange rate from dollars to British pounds (GBP), if $1 = £0.77, then £2.10 would be calculated as 2.10/0.77, or 2.72.

Using the pounds to kilograms conversion rate, 1 kilogram equals 2.2 pounds.

Consequently, the price per unit in dollars would be 2.72/2.2 = $1.236.

If we round to the nearest cent, the price per pound is $1.2.

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Answer: the resulting velocity of the two cars right after the collision is 9.41 m/s

Explanation:

The formula for calculating momentum is expressed as

momentum = mass x velocity

According to the law of conservation of momentum, initial momentum = final momentum

The formula for initial momentum is

m1u1 + m2u2

where

m1 = mass of first car

u1 = initial velocity of first car

m2 = mass of second car

u2 = initial velocity of second car

From the information given,

m1 = 1101

u1 = 18.39

m2 = 1050

u2 = 0 because it is at rest

Initial momentum = 1101 x 18.39 + 1050 x 0 = 20247.39

Since the cars stick together after collision, they would have a common velocity, V. Thus,

final momentum = (m1 + m2)V

final momentum = (1101 + 1050)V = 2151 V

Thus,

20247.39 = 2151 V

V = 20247.39/2151

V = 9.41

the resulting velocity of the two cars right after the collision is 9.41 m/s

Given:

Coal-fired power plant

Required:

Energy transformation in coal-fired power plant.

Explanation:

Coal has chemical energy.

When the coal is heated, the chemical energy transforms into thermal energy.

Thermal energy is used to rotate the blade of the turbine, so thermal energy transforms into mechanical energy.

The rotating blades produce electricity, so mechanical energy transforms into electrical energy.

Final Answer: The energy transformation of a coal-fired power plant is chemical to thermal to mechanical to electrical.

9038 kJ of heat is absorbed by the air assuming some air escapes through the cracks as the heated air in the house expands at constant pressure, and cost of this heat if the unit cost of electricity in that area is $0.075/kWh is $0.19.

In the physical sciences, pressure is defined as the perpendicular force per unit area or the stress at a point within a confined fluid.

A 42-pound box with a bottom area of 84 square inches will press down on a surface with a pressure equal to the force divided by the area over which it is applied, or half a pound per square inch.

The specific heat of air at room temperature is

[tex]C_p[/tex] = 1.007 kJ/kg⋅°C              

The volume and mass of the air in the house are

V = Floor space × height

   = (200 m² )(3m)

   = 600 m ³

Mass = PV/RT

         = [tex]\frac{(1013 kPa)(600 m^3 )}{(0287 kPa.m/kg.K)(10+273.15 K)}[/tex]

         = 7479 kg

The amount of heat that must be transferred to the air in the house as it is heated from 10 to 22°C is calculated, taking into account that the pressure in the house remains constant during heating, as follows:

Q = [tex]mC_p[/tex] [tex](T_2 - T_1)[/tex]

   = (747.9 kg)(1.007 kJ/kg⋅ °C)(22 – 10) °C

   = 9038 kJ

Noting that 1 kWh = 3600 kJ, the cost of this electrical energy at a unit cost of $0.075/kWh is

Enegy Cost = (Energy used)(Unit cost of energy)

                    = (9038/3600 kWh)($0.075/kWh)

                    =  $0.19

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Answer:

m = 3.8 kg

Explanation:

The weight can be calculated as follows:

Where m is the mass and g is the gravity. So, replacing the weight by 37 N and the gravity by 9.8 m/s², we get:

So, solving for m, we get:

Therefore, the answer is m = 3.8 kg

Given

When light is reflected, the incident rays are bent and change direction

To find

Whether the given statement is true

Explanation

When we flash a light on the mirror, the light changes its direction and move in another way. So the incident light changes direction when reflected

Conclusion

The given statement is TRUE

In order to calculate the resistance of this wire, we can use the formula below:

Where p is the resistivity, d is the length and A is the cross-sectional area of the wire.

The resistivity of the copper is 1.72 * 10^-8 ohms*m, so we have:

The Sun is composed of helium and hydrogen. Option C.

The photosphere chromosphere and corona are all part of the Sun's atmosphere. Although the corona is sometimes called the solar atmosphere it is actually the sun's upper atmosphere. The sun's atmosphere includes features such as sunspots, coronal holes, and solar flares the sun is a star.

It's a huge spinning ball of hot gas. The sun is like a star in the night sky. Because we are so close it appears much larger and brighter than other stars. The sun is the center of the solar system and accounts for most of the mass of the solar system. Compared to the billions of other stars in the universe, the sun stands out. But for the Earth and the other planets orbiting around it, the Sun is a powerful focal point.

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The temperature increase of the 2 kg water if 400 kJ of energy is transferred is 47.62 °C

q = m c ΔT

q = Heat

m = Mass

c = Specific heat

ΔT = Change in temperature

q = 400 KJ

m = 2 kg

c = 4200 J/kg °C

ΔT = q / m c

ΔT = 400 * 10³ / 2 * 4200

ΔT = 47.62 °C

The quantity of heat energy required to change the temperature of particle by 1 °C is known as heat capacity. Specific heat capacity is the heat capacity is calculated for 1 gram of matter.

Therefore, the temperature increase of water is 47.62 °C

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Answer:

5 hours

Explanation:

distance/speed= time

1500/300= 5

We have the formula of Newton's second law

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

If we isolate the acceleration

As we can see if the mass increases the acceleration will decrease

Therefore the answer is FALSE

The velocityof the flowerpot when it strikes the ground is 26.04.

What is velocity.

velocity is the prime indicator of the position as  well as the rapidity of an  object. It can be  defined as distances covered by an object in unit of the time. velocity can  defined as the displacement of the object in unit of the time .

Sol- As we know when the object is simply falls it's initial velocity is 0.

Therefore u=0

Given question is flowerpot traveled 34.6 before striking the ground.

Therefore s=34.6

We have to find v?

v^2= u^2+2gs

v^2= 0+2gs

v=√2gs

v=√2×9.81×34.6

v=26.04

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After thoroughly calculating we have come to find that, the tension in the string is 2.752 N

In physics, tension is defined as the pulling force transmitted axially by a string, cable, chain, or other similar object, or by each end of a rod, truss member, or other similar three-dimensional object.

Tension can also be defined as the action-reaction pair of forces acting at each end of the aforementioned elements. Compression's opposite, tension, is possible.

We know that

Tension = (Mass × gravity) / cos∅

Here given that

Mass = 0.280kg

Gravity = 9.8 m/s²

∅ = 4.2°  

Lets substitute the values and we get

Tension = (280g × 9.8 m/s²) / cos4.2°  

Tension = 2.752 N

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Full question

A tetherball leans against the smooth, frictionless

post to which it is attached (Figure 1). The string is

attached to the surface of the ball such that a line

along the string passes through the center of the

ball. The string is 1.40 m long, and the ball has a

radius of 0.110 m with mass 0.280 kg. What is the

tension in the string?

The oscilloscope can be used to measure AC frequency by counting the number of complete waves (Option B).

An oscilloscope is a tool used to measure voltage by observing how the electrical signals from different types of waves may change over a given unit or period of time, which is useful to monitor a client's heartbeat and brain waves.

Therefore, with this data, we can see that an oscilloscope is a device used to measure waves (in this case brain waves) in order to indicate a given outcome associated with electrical signals.

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Given

The focal length , f=3.93 cm

The object distance, u=-19.24cm

To find

The image distance

Explanation

By lens formula we have,

Conclusion

The image distance is 0.0495 m

The time taken up to which the stone will be in the  air is 4.01 seconds.

Here we are dealing with free falling which is referred to as A free falling object is an object that's falling beneath the sole impact of gravity. Any object that's being acted upon as it were by the force of gravity is said to be in a state of free fall. As we are given the velocity which is 19.6 m/s and the height which is 59.4 m.

So the in the first case when the stone travels for a certain distance until its velocity becomes zero.

The formula we are referring to for calculating the maximum height which is v² = u² - 2gh , where v is the final velocity , u is the intial velocity  ,g is the acceleration due to gravity and  h is the height.

So at  v=0

=> h=  u²/2g

=> h = (19.6)2/( 2*9.8)= 19.6 m

Whereas when the stone starts to freely fall, so  

h = 1/2*gt², here the time taken will be, t = √(2h/g)

where h = sum of the height of the building and the height traveled after the throw

which is 19.6 m+59.4 =79

So , t = √(2h/g)

=>t = √2*(79) /9.8 = 4.01 second

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Answer:

Given,

Force = 441 N

mass = ?

Keep in mind that acceleration due to gravity is constant 10m/s.

Force = mass × acceleration due to gravity

mass = Force / acceleration due to gravity

m = 411 N /10m/s

m = 41.1 kg

Therefore her Jenny mass is 41.1 kg.

Answer:

Explanation: We need to find the unit rate or rate of rolls per $1:

To find the number of rolls per one dollar we simply need to take the ratio of the two as follows:

Simplifying (1) gives the answer as follows:

The answer therefore is:

The scenario where a ball in motion describes balanced forces is 1, 3, and 4. That is option B.

Motion is defined as the movement of an object from one position to another with respect to time.

There are different type of motion which include the following:

When an object is in motion, the forces acting on them are said to be balanced when they are equal in magnitude and in opposite directions.

1N + 3N = 4N

This shows that the forces 1N + 3N which is equal to 4N are equal and opposite.

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The cannon ball will travel the highest distance when the angle of projection is 35 degrees.

The maximum height reached by a projectile is calculated using the following formula.

H = u²sin²θ/2g

where;

when the angle of projection is 25 degrees;

H = (25² (sin 25)²) / (2 x 9.8)

H = 5.7 m

when the angle of projection is 35 degrees;

H =  (25² (sin 35)²) / (2 x 9.8)

H = 10.5 m

Thus, the cannon ball will travel the highest distance when the angle of projection is 35 degrees.

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D. As the Sun was forming, the force of gravity caused surrounding dust grains to collide and stick together, forming dust granules into increasingly larger bodies that became planets.

About 4.6 billion years ago, the Solar System was a cloud of dust and gas known as the Solar Nebula.  

Gravity is the force that pulls a body toward the center of the Earth or any other physical body that has mass.

Therefore "As the Sun was forming, the force of gravity caused surrounding dust grains to collide and stick together, forming dust granules into increasingly larger bodies that became planets", best describes scientists explain gravity's role in the formation of our Solar System.

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A diagram of the given problem is the following:

To determine the distance "x" from the interface between the water and the oil of the block we need to add the forces that are acting on the system. We have the following:

Where:

Since the system is in equilibrium this means that the total sum of forces adds up to zero:

Now, the force is the product of the pressure by the area, therefore, we have:

We can cancel out the area:

The pressure is the hydrostatic pressure and is given by:

Where:

Substituting in the equation we get:

Now, we substitute the values of the heights according to the first diagram:

Now, we solve for "x". To do that we will apply the distributive property on the parenthesis:

Now we associate terms according to the value of the height:

Now, we take common factors:

We can cancel out the gravity:

Now, we bring the terms with the height of the block to the right side:

Now, we divide both sides by the factor of "x":

Now, we plug in the values:

We converted the height of the block using the following conversion factor:

Now, we solve the operations, we get:

Therefore, the distance between the interface and the bottom of the block is 0.024 meters.