Which of the following is not a true statement?
A
B
C
D

Answer:

batrix

Explanation:

Mass remains mass no matter what you do to it.

Answer:

B, D and E, not all matter can be filled with air

Answer:

Explanation:

Gravitational potential energy = mgh where m is mass , g is acceleration due to gravity and h is height from the ground .

In the first case mass m = volume x density

= 1 x 1000 = 1000 kg

height h = 30 m

potential energy = 1000 x 30 x 9.8 = 294000 J = 294 kJ .

When height decreases by 10 m , potential decreases as follows .

Decrease in potential energy

= mass x gravitational energy x decrease in height

= 1000 x 9.8 x 10

= 98000 J

= 98 kJ .

Answer:

8.27 * 10^4 m/s ; 14.51 days

Explanation:

Mass of star, Ms = 0.85 mass of earth

Radius of star, Rs = 0.11 radius of earth

Mass of earth = 1.99 * 10^30 kg

Radius of earth round the sun = 1.5 * 10^11 m

Ms = 0.85 * 1.99 * 10^30 = 1.6915 * 10^30 kg

Rs = 0.11 * 1.5 * 10^11 = 0.165 * 10^11 m

1.) The Orbital speed, v

V = sqrt(Gm/r) ; G = 6.67 * 10^11

V = sqrt(6.67 * 10^-11 * 1.6915 * 10^30) / 0.165 * 10^11

V = sqrt(11.282 * 10^19 / 0.165 * 10^11)

V = sqrt(68.377606 * 10^8)

V = 82690.752

V = 8.27 * 10^4 m/s

2.)

T = 2πr / v

(2π * 0.165 * 10^11) /8.27 * 10^4

1.03672 * 10^11 / 8.27 * 10^4

1253598.0 s

Converting seconds to days:

1 sec = 1/ (60 * 60 * 24) = 1/86400 days

Hence,

1253598.0 * (1/86400)

= 14.509236 days

= 14.51 days

Answer:

θ = 90º

Explanation:

The velocity is given by

          v = [tex]\frac{dr}{dt}[/tex]

calculate

          v = 3 i ^ + √2 j ^ + 2t k ^

acceleration is defined by

         a = dv / dt

         a = 2 k ^

one way to find the angle is with the dot product

         v. a = | v | | a | cos θ

         cos θ= v.a / | v | | a |

Let's look for the value of each term

       v. a = 4 t

        | v | = [tex]\sqrt{3^2 + 2 + (2t)^2 }[/tex] = [tex]\sqrt{ 11 + 4t^2}[/tex]

        | a | = 2

they ask us for the angle for time t = 0

         v. a = 0

        | v | = √11 = 3.317

we substitute

        cos θ = 0 /√11

        cos θ = 0

therefore the angles must be θ = 90º

Answer:

158.32 K = -114.83 °C

Explanation:

Since P = P' where P = power absorbed and P' = power radiated

P = αAQ where α = absorptivity = 0.3, A = area of spacecraft and Q = rate of incident solar radiation = 950 W/m²

Also, P' = εσAT⁴ where ε = emissivity of spacecraft = 0.8, σ = Stefan-Boltzmann constant = 5.67 × 10⁻⁸ W/m²K⁴, A = area of spacecraft and T = surface temperature of spacecraft.

So, P = P'

αAQ = εσAT⁴

T⁴ = αQ/εσ

T = ⁴√(αQ/εσ)

Substituting the values of the variables into the equation, we have

T = ⁴√(0.3 × 950 W/m²/(0.8 × 5.67 × 10⁻⁸ W/m²K⁴))

T = ⁴√(285 W/m²/(45.36 × 10⁻⁸ W/m²K⁴))

T = ⁴√(6.2831 × 10⁸ K⁴))

T = 1.5832 × 10² K

T = 158.32 K

In Celsius T(C) = 158.32 - 273.15  = -114.83 °C

Answer:

19600 N

Explanation:

weight = mass x gravity

We know that gravity = 9.8 m/s^2 and mass = 2000 kg.

w = m x g

w = 2000 kg x 9.8 m/s^2

w = 19600 N

The weight of the object is 19600 N (newtons).

Answer:

the answer i 2000kg

Explanation:

Answer:

The answer is below

Explanation:

The heat flux or heat intensity is the flow of energy per unit area per unit time. measured in watts per meter² (W/m²).

a) The surface area of filament = πDL

D = diameter = 0.5 mm = 5 * 10⁻⁴ m, L = length = 5 cm = 5*10⁻² m

surface area of filament = π* 5 * 10⁻⁴ m * 5*10⁻² m = 25π * 10⁻⁶ m²

The heat flux on the surface of filament = 150 W / (25π * 10⁻⁶ m²) = 1.91 * 10⁶ W/m²

b) Since the glass tube is a sphere with diameter = 8 cm;

radius (r) = diameter / 2 = 4 cm = 4* 10⁻² m

Surface area of glass tube = 4πr² = 4π * (4* 10⁻²)²  = 64π* 10⁻⁴ m²

The heat flux on the surface of filament = 150 W / (64π* 10⁻⁴ m²) = 7.46 * 10³ W/m²

c) The total energy consumed in a year = 150 W * 365 days * 8 hours/day =  438000 Wh = 438 kWh

Cost of energy = unit cost * energy consumed = $0.08/kW * 438 kWh = $35.04

Answer:

Gravity...this was proven by NASA and was examined by Leonardo da Vinci.

Answer:

Gravity

Explanation:

In the absence of air resistance, Gravity accelerates all objects at the same rate of 9.8 m/s2

Answer:

first value+2nd +3rd

Explanation:

thug life and there

Answer:

B. Grass

Explanation:

In the diagram above, Grass is where, light energy converted to chemical energy. Hence option B is correct.

Visible light spectrum is nothing but the range of wavelength of radiation from 4000 angstrom to 7000 angstrom(Violet to Red). light is a energy packet. Every Photon having different wavelength travels with same velocity c (velocity of light). When we focus numbers of colors from visible spectrum to a point, that point appears as a white light. hence white light is composed of numbers of Colors in it.

Light itself is a energy when it falls on the grass, grass grows by taking energy from the light and convert that energy into biomass that is a chemical energy.

Hence option B is correct.

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In comparing of result of experiment A and B, the result of A is by 2 factors differ from experiment B.

The given parameters;

in group A, distance traveled by the red block, s = 15 ± 3 feet

in group B, distance traveled by the green block, s = 25 ±  4 feet

To find:

Since both groups performed the experiment at equal times, we assume the time for both motion = t

Also, assume the initial velocity of both blocks = 0

For group A, we set-up the equation of motion as follows;

[tex]s = v_0t + \frac{1}{2} at^2 \\\\15+ 3 = 0 + 0.5\times a_1t^2\\\\18 = 0.5a_1t^2\\\\t^2 = \frac{18}{0.5a_1} \\\\t^2 = \frac{36}{a_1}[/tex]

For group B, we set-up the equation of motion as follows;

[tex]25 + 4 = v_0t + \frac{1}{2} a_2t^2\\\\29 = 0.5\times a_2t^2\\\\t^2 = \frac{29}{0.5a_2} = \frac{58}{a_2}[/tex]

Solve the first equation and the second equation together;

[tex]\frac{36}{a_1} = \frac{58}{a_2} \\\\\frac{a_2}{a_1} = \frac{58}{36} \\\\\frac{a_2}{a_1} = 1.61[/tex]

The ratio of error margin of both experiments;

[tex]\frac{4}{3} = 1.33[/tex]

The resulting parameter for comparison;

[tex]parameter, t' = 1.33 \times 1.61 = 2.14 \approx 2.0[/tex]

Thus, in comparing of result of experiment A and B, the result of A is by 2 factors differ from experiment B.

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Answer:a

Explanation:

Because its has to use tihs potential energy to overcome the atmosphere so the shuttle will not go back down

The speed will be 10 m/s after the 1st and 20 m/s after the 2nd for an average of 15 m/s. So it will travel 15 m during that 2nd second

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The object, which  undergoes constant acceleration after starting from rest, will go in the next second​ 15 m.

Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).

Given parameters:

initial velocity of object: u = 0.

time = 1 second.

distance travelled: d= 5 m.

So, acceleration of the object: a = 2d/t² = (2×5)/1² m/s² = 10 m/s².

Hence,   it will go in the next second​ = 1/2×a(2²-1²) m

= 1/2×10×3 m.

= 15 m.

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This question is incomplete, the complete question is;

Now we will examine the electric field of a dipole. The magnitude and direction of the electric field depends on the distance and the direction. We will investigate in detail just two directions. With charges available in the simulation (all the charges are either positive or negative 1 nC increments).

how do you create a dipole with dipole moment 1 x 10-9 Cm with a direction for the dipole moment pointing to the right. Make a table below that shows the amounts of  charge and the distance between the charges. There are many correct answers

Answer:

Given the data in question;

Dipole moment P = 1 × 10⁻⁹ C.m

now dipole pointing to the right;

               P→

[tex]_{-\theta }[/tex] (-) ---------------->(+) [tex]_{+\theta }[/tex]

               d

so let distance between the dipoles be d

∴ P = d[tex]\Theta[/tex]

Let [tex]\Theta_{1}[/tex] = 1 nC

so

P = d[tex]\Theta[/tex]

1 × 10⁻⁹ =  1 × 10⁻⁹  × d

d = (1 × 10⁻⁹) / (1 × 10⁻⁹)

d = 1 m

Also Let [tex]\Theta_{2}[/tex] = 2 nC

so

P = d[tex]\Theta[/tex]

1 × 10⁻⁹ =  2 × 10⁻⁹  × d

d = (1 × 10⁻⁹) / (2 × 10⁻⁹)  

d = 0.5 m

Also Let [tex]\Theta_{3}[/tex] = 3 nC

so

P = d[tex]\Theta[/tex]

1 × 10⁻⁹ =  3 × 10⁻⁹  × d

d = (1 × 10⁻⁹) / (3 × 10⁻⁹)

d = 0.33 m

such that;

charge                 distance

1 nC                        1.00 m      

2 nC                       0.50 m

3 nc                        0.33 m

4 nC                       0.25 m

5 nC                       0.20 m      

larong pinoy

Explanation:

ito ay larong Pinoy

Answer:

the banking angle of the road is 24.2⁰

Explanation:

Given;

speed of the vehicles considered, v = 75 mi/h

Speed in m/s ⇒ 1 mi/h --------> 0.44704 m/s

                         75 mi/h --------> ?

=   75 x 0.44704 m/s = 33.528 m/s

radius of the curve, r = 255 m

The banking angle of the road is calculated as;

[tex]\theta = tan^{-1} (\frac{v^2}{rg} )\\\\\theta = tan^{-1} (\frac{33.528^2}{255\times 9.8} )\\\\\theta = tan^{-1}(0.44983)\\\\\theta =24.2^0[/tex]

Therefore, the banking angle of the road is 24.2⁰

The angle of banking is 24 degrees.

As a driver approaches a bend two equal and opposite forces act on him which are the centripetal force and the centrifugal force. The driver will have to ben through a certain angle called the angle of banking to avoid falling off.

The angle of banking depends on the speed of the vehicle and the radius of the curve.

θ = v^2/rg

speed = 75.0 mi/h or 33.5 m/s

r = 255 m

g = 9.8 ms-1

θ = tan-1 (33.5 m/s)^2/ 255 m × 9.8 ms-1

θ =   tan-1(1122.3/2499)

θ =  24 degrees

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Answer:

x = 0.67 m

Explanation:

For this problem, let's use the projectile launch equations, as the jug goes through the bar, it comes out with horizontal speed vx = 1.3 m / s, which does not decrease as there is no friction.

Let's find the time or it takes to get to the floor

          y = y₀ + v_{oy} - ½ g t²

in this case I go = 0 and when I get to the floor y = 0

         0 = y₀ + 0 - ½ g t²

          t² = 2y₀ / g

          t² = 2 1.3 / 9.8 = 0.2653

          t = 0.515 s

now let's find the distance traveled in this time

         x = vx t

         x = 1.3  0.515

         x = 0.6696 m

         x = 0.67 m

Option C shows the direction of the force of the ball on the spring. The direction of the force of the ball on the spring will be downwards.

Force is defined as the push or pull applied to the body. Sometimes it is used to change the shape, size, and direction of the body.

Force is defined as the product of mass and acceleration. Its unit is Newton.

The spring is extended downward because the weight is always act downwards. The direction of the force of the ball on the spring will be downwards.

Hence, option C shows the direction of the force of the ball on the spring

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Answer: false

Explanation:

Answer:

false

Explanation:

According to Newton's First Law of motion, an object remains in the same state of motion unless a resultant force acts on it.

Answer:

distance = 0.2330142 miles

= 0.2330142 mi

Explanation:

not sure if its right though....

Answer:

1) Final Temperature of the gas in A will be GREATER than the temperature in B

2) Diagram of both processes on a single PV has been uploaded below

3) The Initial  pressures in containers A and B is 3039.87 J/liters

4) the final volume of container B is 923.36 cm³

Explanation:

Given that;

Temperature = 20°C = 293 K

mass of piston = 10 kg

Area = 100cm³

Volume V = 800 cm³ = 0.8 L

ideal gas constant R = 8.3 J/K·mol

1)

Final Temperature of the gas in A will b GREATER than the temperature in B

2)

Diagram of both processes on a single PV has been uploaded below,

3)

Initial  pressures in containers A and B

PV = nRT

P = RT/V

we substitute

P = (8.3 × 293) /  0.8

P = 2431.9 / 0.8

P = 3039.87 J/liters

Therefore, The Initial  pressures in containers A and B is 3039.87 J/liters

4)

Given that;

power = 25 W

time t = 15s

the final volume of container B = ?

we know that;

work done = power × time

work done = 25 × 15 = 375

Also work done = P( V₂ - V₁ )

so we substitute

375 = 3039.87 ( V₂ - 0.8 )

( V₂ - 0.8 ) = 375 / 3039.87

V₂ - 0.8 = 0.12336

V₂ = 0.12336 + 0.8

V₂ = 0.92336 Litres

V₂ = 923.36 cm³

Therefore, the final volume of container B is 923.36 cm³

We have that

a) We Draw a graph to follow the equation

   [tex]v=\frac{m_0u}{m_0-dt}[/tex]

b) The speed of the rocket changes because Momentum is conserved because with the law of conservation in mind mass is reduced thereby causing increase in speed

c) The rocket does NOT have to keep expelling gas to stay at a constant speed because On the account of maintaining speed the Rocket need not expel gas as that will only increase speed and not maintain it

a)

Let

Mass =m

Time t

Generally, the equation for mass ejection constant is mathematically given by

[tex]\phi=\frac{d_m}{d_t}[/tex]

Therefore

[tex]m=m_0-\phi t[/tex]

where

[tex]m_0=initial\ mass[/tex]

Apply the law of conservation of momentum which states that

Conservation of momentum, states that momentum can neither be lost nor gained in an isolated system

[tex]m_o\mu=mv[/tex]

[tex]v=\frac{m_0u}{m_0-dt}[/tex]

b)

Momentum is conserved because with the law of conservation in mind mass is reduced thereby causing increase in speed

c)

On the account of maintaining speed the Rocket need not expel gas as that will only increase speed and not maintain it.Therefore the answer is NO

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Answer:

Sodium (K)

Explanation:

Answer:

Explanation:

a

Answer:

t = 13.3 s

Explanation:

       [tex]x = v_{o}*t + \frac{1}{2} * a * t^{2} (1)[/tex]

       [tex]v_{f1} = a* t = 7.0m/s2*3.8s = 26.6 m/s (2)[/tex]

       [tex]x_{1} = v_{f1}*t + \frac{1}{2} * a * t^{2} (3)[/tex]

       [tex]x_{2} = v_{f2}*t = 73.3m/s*t (4)[/tex]

Answer:

Explanation:

Net electric field at the centre will be zero .

Since all the charges are equal and they all are symmetrically situated around the centre . So the electric field produced by each will cancel  out each other and hence the resultant electric field will be zero . It happens because electric field is a vector quantity and therefore it adds up vectorially . All the four electric field will form two pairs , in each pair electric fields are acting in opposite direction . So they all cancel out to zero .

Answer:

   a = - 1.8 m / s²

Explanation:

To solve this exercise let's use Newton's second law, let's start by defining a reference system with the x axis parallel to the plane, in the adjoint we can see a diagram of the forces

let's break down the weight

           sin 42 = Wₓ / W

           cos 42 = W_y / W

           Wₓ = W sin 42

            W_y = W cos 42

Y axis  

     N- W_y = 0

     N = W_y

     N = mg cos 42

X axis

     fr -Wₓ = m a

     a = (fr - mg sin 42) / m

the friction force has the formula

    fr = μ N

    fr = μ mg cos 42

we substitute

    a = (μ g cos 42– g sin 42)

    a = g (μ cos 42 - sin 42)

let's calculate

    a = 9.8 (0.650 cos 42 - sin 42)

    a = - 1.8 m / s²

The negative sign indicates that the acceleration is downward, so the boy is descending.