Please help me to solve this problem

Answer:

d

Explanation:

you record it during the test

Answer:

the object is not accelerating

Answer:Wavelength

Explanation: The wavelength of a wave is the distance between any two corresponding points on adjacent waves.

Answer:

Explanation:

Let m be target car mass

a)

conservation of momentum

(3m)u + m(0) = (3m + m)(2.4)

               3u = 4(2.4)

                u = 3.2 m/s

b)

system energy is originally in the striking car as kinetic energy

KE = ½(3m)3.2² = 15.36m J

at full compression, kinetic energy is

½(3m + m)2.4² = 11.52m J

so spring potential energy fraction of total energy is

(15.36 - 11.52)/15.36 = 0.25 or 25%

c)

The center of mass (CoM) is moving at 2.4 m/s

The CoM sees the larger mass car approach at

3.2 - 2.4 = 0.8 m/s and will see it depart at - 0.8 m/s

so a ground based observer would see it moving at

v₁ = 2.4 + -0.8 = 1.6 m/s in its original direction

The CoM sees the smaller mass car approach at

0 - 2.4 = -2.4 m/s and will see it depart at + 2.4 m/s

so a ground based observer would see it moving at

v₂ = 2.4 + 2.4 = 4.8 m/s in its original direction of the larger car

so the relative velocity of approach at 3.2 - 0 = 3.2 m/s

equals the relative velocity of departure at 4.8 - 1.6 = 3.2 m/s

checks.

Answer:

4.80 seconds

Explanation:

The velocity of sound is obtained from;

V= 2d/t

Where;

V= velocity of sound = 329.2 ms-1

d= distance from the wall = 790.5 m

t= time = the unknown

t= 2d/V

t= 2 × 790.5/ 329.2

t= 4.80 seconds

The time is taken by the sound to reach the hiker will be  t= 4.80 seconds

The sound velocity is defined as the distance traveled by the sound wave in a particular direction with respect to time.

The velocity of sound  is given by the formula:

[tex]V=\dfrac{2d}{t}[/tex]

Here;

V= velocity of sound = 329.2  [tex]\frac{m}{s^2}[/tex]

d= distance from the wall = 790.5 m

t= time = the unknown

The time will be calculated as:

[tex]t=\dfrac{2d}{V}[/tex]

[tex]t=\dfrac{2\times 790.5}{329.2}[/tex]

[tex]t=4.80\ seconds[/tex]

Hence the time is taken by the sound to reach the hiker will be  t= 4.80 seconds

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(A)

Explanation:

The number of atoms for each element on the left side must equal that on the right side. Only (A) satisfies that condition. The other other choices have mismatching number of atoms on either side.

Answer:

6.93 kg

Explanation:

m1 = 8.90 kg

T1 = -5°C

m2 = 12 kg

T2 = 15°C

constant needed:

c (ice) = 2100 J/kg °C

c (water) = 4200 J/kg °C

L (Latent Heat) = 336 000 J/kg

Black Principle

Q (release) = Q (absorbs)

Q (release) max = m2 c(water) ∆T2

Q (release) max = 12 x 4200 x (15-0)

Q (release) max = 756 000 J

Q (absorbs) = m1 c(ice) ∆T1 + m1 L

Q (absorbs) = 8.9 x 2100 x (0-(-5)) + 8.9 x 336 000

Q (absorbs) = 93 450 + 2 990 400 = 3 083 850 J

since Q (absorbs) is much much bigger than Q (release), only a few litlle ice melting. So we need to see how much ice melting and how many left.

Q (release) - Q (absorbs) ice -5°C to ice 0°C = 756000 - 93450 = 662550

mass of melting Ice

Q (absorbs) melting ice = m(melting) L

662 550 = m(melting x 336 000

m (melting) = 662 500/336 000

m (melting) = 1.977 kg

so the ice remains is 8.90 - 1.97 = 6.93 kg

Answer:

Birds and fish both have a backbone structure, which makes them structurally and functionally similar.

Explanation:

Answer: The acceleration of Kaya is .

Explanation:

Answer:

Kaya's acceleration is 1.41666667.

Explanation:

To find the acceleration we need to subtract the starting speed to the slowed speed. So 14 - 5.5 = 8.5.

Now we divide 8.5 by the time, 6 seconds.

Our final answer is 1.41666667, or rounded, 1.42.

This question involves the concepts of Fourier's law of heat conduction and heat loss per unit time.

The heat energy loss per second is "3.12 x 10⁸ W".

Applying Fourier's Law of Heat Conduction here, we get:

[tex]Q = -kA\frac{\Delta T}{\Delta x}[/tex]

where,

Q = heat energy loss per unit time = ?

k = thermal conductivity = 0.2 cal/cm.°C.s [tex](\frac{4.184\ J}{1\ cal})(\frac{100\ cm}{1\ m})[/tex] =  83.68 J/m.°C.s

A = Surface area = (circumference)(length) = (8 m)(40 m) = 320 m²

ΔT = difference in temperature = 20°C - 195°C = -175°C

Δx =thickness of insulation = 1.5 cm = 0.015 m

Therefore,

[tex]Q = -(83.68\ J/m.^oC.s)(320\ m^2)(\frac{-175\ ^oC}{0.015\ m})\\\\[/tex]

Q = 3.12 x 10⁸ W = 312 MW

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Answer:

A. 30 feet

Explanation:

Including reaction time, the stopping distance is more than 20 feet at 10 miles per hour, at 20 miles per hour it will be about 63 feet. Option B is correct.

Speed is defined as the rate of change of the distance or the height attained. it is a time-based quantity.

Given conditions;

10 miles per hour ⇒ 20 feet

1 mile per hour ⇒ 2 feet

20 miles per hour ⇒ 20 × 2 feet

20 miles per hour ⇒ 20 × 2 feet

20 miles per hour ⇒40 feet

If the stopping distance is more than 20 feet at 10 miles per hour at 20 miles per hour it must be more than 40 feet.So that the correct answer is 63 feet.

Hence option B is correct.

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Answer:

which can cause an object with mass to change its volocity

Answer:

Let, θ be the angle between vector a and vector b.

So, the angle between vector a and vector (-b) must be (180° - θ).

Magnitude of the difference of vectors a and b

= |a - b|

= Magnitude of the resultant of the vector sum of the vectors a and (-b)

= |{√|a|^2 + |b|^2 + 2 * |a| * |b| * cos (180° - θ)}|

= |{√|a|^2 + |b|^2 - 2 * |a| * |b| * (cos θ)}|.

Explanation:

Answer:

Explanation:

Complete the following sentence: If the car is 100% efficient, it could travel a distance of 900 meters on a single battery charge.

    W = Fd

1800 = 2d

     d = 900

Assuming 100 % efficient means turning battery power into motion.

A car totally 100% efficient would have zero friction and could travel an infinite distance on a full battery charge.

Answer:

Explanation:

a = gsinθ

a = 9.8sin30

a = 4.9 m/s²

v² = u² + 2as

v² = 0² + 2(4.9)(10)

v² = 98

v = √98 = 9.8994949...

v = 9.9 m/s

The static friction exerted on the block by the incline is [tex]\mu _ s _1 Mgcos \ \theta[/tex].

The given parameters;

The normal force on the block is calculated as follows;

Fₙ = Mgcosθ

The static friction exerted on the block by the incline is calculated as follows;

[tex]F_s = \mu_s F_n\\\\F_s = \mu _s_1(Mg cos\ \theta)\\\\F_s = \mu _s_1 Mgcos\ \theta[/tex]

Thus, the static friction exerted on the block by the incline is [tex]\mu _ s _1 Mgcos \ \theta[/tex]

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Answer:

Explanation:

https://www.science.org/content/article/cats-behave-liquids-tampons-play-music-and-other-advances-honored-ig-nobel-prizes

Answer:

Liquid or Both

Explanation:

Cats exist in their own three states of matter: loaf, cinnamon roll, and liquid. The last category is certainly the most confusing because cats should be solids — and of course, they can be.

[tex]\\ \sf\longmapsto Frequency=\dfrac{1}{Time}=\dfrac{1}{3}=0.33s^{-1}[/tex]

Velocity be v

[tex]\\ \sf\longmapsto v=f\lambda[/tex]

[tex]\\ \sf\longmapsto V=0.33(1.5)[/tex]

[tex]\\ \sf\longmapsto V\approx 0.5ms^{-1}[/tex]

Given,

Wavelength = 1.5 metres

T = 3 seconds OR 3.0 seconds

We know that the formula of Frequency–

1/Time

According to the question we have seen that Time is 3 seconds

[tex] \sf \longmapsto \: Frequency = \frac{1}{3 .0 \: seconds} [/tex]

[tex] \sf \longmapsto \: Frequency = 0.33 seconds^{-1} [/tex]

We Know,

Velocity = Frequency

[tex]\sf \longmapsto Velocity =0.33 \times 1.5 [/tex]

[tex]\sf \longmapsto \: 0.5 \: m/s ^{-1}[/tex]

Answer:

= 6.975 m

Explanation:

3.1 m = 1 s2

? = 2.25 s2

(3.1 * 2.25)/1

= 6.975m

Answer:  lamda max= 16,5m   lamda min=  0,0165m (air)  

lamda  max= 75m, lamda min=0,075m (water)

Explanatin

Answer:

E-MgO(Magnesium Oxide)

Answer:

.

Explanation:

Answer:

Explanation:

Of the 4 numbers given, the answer is 1 or A

If you take the absolute value of abs(1 - 1.04) you get 0.04.

(2 - 1.04) = 0.96

1.25 - 1.04 = .21

1.5 - 1.04 = 0.46

The last three are all larger than 0.04

Note: absolute value means the positive difference between 2 numbers (even  though it is negative). If it is negative, absolute value makes it positive.

Answer:

a lot of the masks are hand made a long time ago its really an art

Explanation:

Because it is a piece of art that is hard to craft  

Answer: 140.625

Explanation: Because energy gained due to damped motion and needs to be absorbed

Answer:

The lithosphere is the Earth's stable outer layer. The lithosphere is made from the brittle top mantle and the crust, which are the Earth's outermost layers. The atmosphere above it and the asthenosphere (another issue of the top mantle) underneath it define its limitations. even though the rocks of the lithosphere are nevertheless taken into consideration elastic, they may be not viscous. The asthenosphere is viscous, and the lithosphere-asthenosphere boundary (LAB) is the component in which geologists and rheologists—scientists who study the drift of depend—mark the difference in ductility among the 2 layers of the top mantle. Ductility measures a strong cloth’s ability to deform or stretch under strain. The lithosphere is a long way less ductile than the asthenosphere.

Explanation:

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Answer:

Explanation:

½m5² / ½m20² = 25/400 = 1/16 = 0.0625

Answer:

reduce

Explanation:

It will reduce the wavelenth