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3 years ago

According to the law of conservation of energy, which changes would

Physics

2 answers:

LenaWriter [7]3 years ago

5 0

Answer: C. in addition of 200 J of thermal energy in a loss of 350 J of kinetic energy

i took the test

Svetach [21]3 years ago

4 0

I think the answer is a that what i think

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Seberkas cahaya monokromatik dijatuhkan pada kisi difraksi dengan 5000 goresan/cm menghasilkan spectrum garis terang orde kedua

Vlada [557]

Answer:

500 nm

Explanation:

In this problem, we have a diffraction pattern created by light passing through a diffraction grating.

The formula to find a maximum in the pattern produced by a diffraction grating is the following:

$d sin \theta = m\lambda$

where:

d is the distance between the lines in the grating

$\theta$ is the angle at which the maximum is located

m is the order of the maximum

$\lambda$ is the wavelength of the light used

In this problem we have:

$\theta=30^{\circ}$ is the angle at which is located the 2nd-order bright line, which is the 2nd maximum

n = 5000 lines/cm is the number of lines per centimetre, so the distance between two lines is

$d=\frac{1}{d}=\frac{1}{5000}=2\cdot 10^{-4} cm = 2\cdot 10^{-6} m$

Re-arranging the equation for $\lambda$ , we find the wavelength of the light used:

$\lambda=\frac{d sin \theta}{m}=\frac{(2\cdot 10^{-6})(sin 30^{\circ})}{2}=5\cdot 10^{-7} m = 500 nm$

4 0

3 years ago

If a car that is moving 20.0 m/s has a momentum of 29000 kg·m/s, what mass is the car?

Strike441 [17]

Answer:

Mass = 1450kg

Explanation:

P = M * V (where p is momentum, m is mass and v is velocity)

29000 = 20 * M

M = 29000 / 20

M= 1450 kg

3 0

3 years ago

A mine car, whose mass is 440kg, rolls at a speed of 0.50m/s on ahorizontal track, as the drawing shows. A 150kg chunk of coalha

ella [17]

Answer: 0.56 m/s

Explanation:

hello, there is 25° inclination angle for the chute in the drawing. Thankfully, I know this problem. The conservation of momentum.

so there are X and Y components for the momentum in this problem. The Y component is not conserved as when the coal gets in the cart, the normal force exerted by the surface reduces it to 0.

Now, the X component is definitely conserved here.

so you have the momentum of the cart which is 440*0.5 added to the momentum of the chunk which is 150*0.8*cos(25°), that is the momentum before the coupling between the objects. Afterwards both objects will have the same velocity, so we write the equation like this:

$440*0.5 + 150*0.8*cos(25) = 440*v_{final} + 150*v_{final} \\ => 220+120*cos(25) = (440+150)v_{final} => v_{final} = \frac{220+120*cos(25)}{590} = 0.56 m/s$

3 0

3 years ago

HELP ASAP due in 5m

Papessa [141]

Answer:

I belive it is the one at the bottom of the table visable in the picture with 27.4 radioactive age

Explanation:

8 0

3 years ago

*Urgent* I WILL GIVE BRAINLIEST

Butoxors [25]

Answer:

walking to school

Explanation:

Driving a car to school

, and taking the bus to school both take up energy, unlike walking to school.

unless ur talking about energy, counting energy you produce and use to complete things, then it would be the 3rd one, taking the bus to school.

4 0

3 years ago